Formula design of environment-friendly packaging printing ink

Introduction: This article focuses on the low-viscosity LX-2 resin that is currently being put on the market. It is widely used in printing products for coating, printing, printing, and printing, by introducing D3 resin and modified graft-extended packaging materials. Etc. Overcoming the current stimulating odor of natural resins after amines catalyzed neutralization and the two major defects of poor adhesion strength on non-absorbent substrates. For the convenience of title: The synthetic resin is now officially named: LD.

In order to conduct more in-depth discussions, the author has successively carried out the coating and compounding of downstream ink manufacturing and packaging printing in seven ink and color printing plants in Hangzhou, Zhejiang Dibang and Nanyang, Yuhua, Henan, and obtained the following, namely, can be used for the table India, can also be used for printing and screen printing formula design and technology. (I) Main raw materials In order to better develop waterborne binders in glue, varnish, ink, and paint systems. Everyone knows that it is possible to obtain the water-solubility of the resin when it is closely related to the economic value and use in industrial chemistry, that is, the basic principle called the matching technology, which is also a necessary condition for this article. As Engels said: "Quality causes quantitative changes, quantitative changes lead to qualitative change; the opposite is the invincible law of mutual penetration." A main resin is LX-2 resin, is modified by natural rosin esters almost everywhere. The new compounds derived from sexual agents under certain conditions can naturally form a film under the conditions of normal-temperature water dissolving and amine-induced catalytic exothermic effects. In addition to absorbent packaging materials, due to their high softening point and high acid The value is fully adaptable to the treated PE plastic substrate. Although the system does not contain toxic substances and low cost, moderate film formation, heat and water resistance, and good dispersion stability, similar to the traditional polyamide resin, excellent initial tack is applied to glue, varnish, ink, paint Products meet the requirements of China's environmental protection standards. Its main technical indicators: acid value 220-240, softening point 120 °C and so on.

The B3 auxiliary resin D3 resin is made up of 80% natural Asiatic beta-oxidation resin with D3 wax and a small amount of alpha-oxidation resin and D3 acid soluble in alcohol. Dissolved in petroleum hydrocarbons or alcohol solvents to introduce OP-10 emulsification and adjust the pH of the amine by 8-9 to become excellent tack retention and color retention, widely used in inks, paints, and driers. Its main technical indicators are: softening point 120±5°C/melting point 70-80°C/acid value 30 or resin density 1.03-1.06. C auxiliary materials: solvents (including water), emulsifiers, ammonia, etc. (B) LD resin formulation design 1. Formulation example: 1LX-2 resin 13.0-26% 2 ammonia water (18-28%) 11-16% 3 deionized water or tap water (ph: 7.0) 16-20% 4D3 resin 21-26% 5 Solvents 13-18% 6 Emulsifiers 1.1-2.0% 7 Water 10-15% 8 Aqueous ammonia (18-28%) Adjust pH: 7.0-8.5 Suitable amount 9 Additive 200s 3-5% 10HD35 or A6 wax 0.2-3% (11) LJJ film drying liquid 1-10% Total 100% 3. Production synthesis process (1). LX-2 resin liquid deionized water or tap water 16-20KG into the reactor, adding ammonia water (18-28%) After 11-16% stirring, the LX-2 resin is slowly added, and catalyzed (amine neutralization) for about 25-40 minutes. The clearing stops. Test ph 8-9. If it can not reach the required amount of ammonia after adding to meet the requirements, stop the stirring and discharge the material to be used. Note: If it is for absorbable materials, the PH value can be adjusted to 8-9.

If it is for non-absorbent materials, the PH value can be adjusted to 7-8. (B) D3 resin emulsion solvent into the reaction vessel, add D. resin, heating temperature 40-150 °C (can also be heated without heating), and start stirring, stirring about 10-25 minutes, dissolved transparent, add the emulsifier to continue stirring, then Slowly add deionized or tap water for 3-5 minutes without stopping the machine. After measuring the pH value, it is better to add ammonia water according to the stated standard, so that when the pH value meets the requirements, the material is filtered and used. Note: If only used as coating oil or glue, ink, paint connection material, when (B) the measured PH value meets the requirements, add (a) slowly under stirring, continue to disperse for 5-10 minutes, test the viscosity, PH value After that, the material is filtered and turned into a LD resin solution. (III) Application of LD Resin 1. Lacquer Oil Formulation Example: 1.1 Paper Concave Varnish 1.2 Plastic OPP, PVC, Aluminum Foil Varnish Material Name 1# (%) 2# (%) Raw Material Name 1# (%) 2# (%) 3# (%) LX-2 liquid 70.0 87.0 LD resin solution 75.0 80.0 56.0 950 Emulsion 10.0 - 200S 5.0 4.5 3.0 308 Leveling agent 1.0 0.3 Alcohol, ester solvent 5.0 10.0 7.0 200S 1.0 1.0 Water 15.0 5.0 3.5 Water 14.0 10.0 Amount of Amount of Ammonia Amount of Amount A6 or HD35 2.0 1.0 Lubricant - 0.5 0.5 LJJ Film Drying Fluid 1.0 0.7 950 Emulsion - 20.0 TotalB - - 10.0 Total 2. Ink Formulation Example: 2.1 Waterborne Ceramics Ink LD resin solution 40.0 Defoamer 0.2 Urea 7.8 50% Gelatin 13.4 Potassium soap 4.9 1% Cellulose 1.0 Emulsifier 3.5 Hydration 4.2 Glycerin 20.0 Waterborne amino resin solution 5.0 Total 100%

3. Example of aqueous carton ink and moistureproof agent formulation: 3.1 Flexographic ink raw material name 1# (%) 2# (%) 3# (%) LD liquid 70.0 67.0 - LX-2 resin liquid - - 70.0 Pigment 10.0 - - Hard Zinc Zinc 2.0 3.0 — DR-900 4.0 — — Color paste — 30.0 30.0 Water 10.0 — — Ethanol 4 — Total 4. Example of water-based woven bag ink formulation: 4.1 Flexible letterpress woven bag (PE cast film/cement Bag) Water-based ink LX-2 resin 23.9 20% ammonia 7.5 water 16.2 defoamer 2.6 water 33.4 talcum powder 5.7 wax powder 0.7 pigment 10.0 total 100 5. Intaglio water-based plastic surface printing, ink printing ink formula example: 5.1 water-based plastic silk screen printing plate Ink Formula LD Resin Liquid 60.0 216B Emulsion 10.0 Water Color Paste 30.0 Total 100 Note: Suitable for the printing of substrates such as OPP and PVC. 5.2 Hydroalcoholic Intaglio Printing Ink Formula Examples: (For OPP, PET, Aluminum Foil, etc.) Raw Material Name 1# (%) 2# (%) Raw Material Name 1# (%) 2# (%) LD Resin Solution 9.0 27.0 LD Resin Solution 18.0 22.0 50% LX-1 26.0 18.0 50% LX-1 22.0 26.0 Dispersant 0.1 0.2 Dispersant 0.1 0.3 Titanium Dioxide 30.0 - Titanium Dioxide 30.0 - Filler 3.9 3.0 Filler 4.0 3.0 Ethanol 20.0 30.0 Ethanol 20.0 24.0 Ethyl 9.8 17.5 Ethyl 10.6 10.2 TM-200S 1.0 2.5 TM-200S 1.0 1.5 Pigment — 10.0 Pigment — 12.0 OK-412 0.2 — OK-412 0.3 — A6 or DH35 — 0.8 LJJ Film Drying Fluid 1.0 2.0 Total 100 100 Total 100 100 5.3 Water-based plastic intaglio ink formulation and examples No. Material 1# (%) 2# (%) 3# (%) Remark 1 30% LX-2 solution 57.80 49.50 41.130

1. If it is a recirculation or sand mill production, it is recommended to dissolve and aminate the LX-2 resin first, and then batch the ink. 2, in order to improve the color concentration, moderate increase in resin content, PH value, especially TM-200S. 3, in order to improve the printing ink film drying speed, calcium powder instead of talcum powder. A convenient method is to add LJJ film-forming drier liquid. 4, white ink is usually rutile titanium dioxide is better, to reduce the cost of anatase can also be used. 5, the color of the pigment determines the pigment content, PH value. 6, when the grinding fineness to meet the requirements, then add 950 emulsion stirring 3-10 minutes. 7, the cost wants to reduce, increase the amount of water or alcohol. 8. The control of resin binders and the selection of lightfast pigments will determine the pH. 9. The control of the pH of the binder material is the key to determining the ink stability. The adhesion fastness determines the choice of resins and pigments.

Among them: 1LX-2 resin 17.34 14.85 12.339 2 ammonia water (25%) 4.70 4.00 3.300 3 water (distilled water) 20.00 17.00 14.000 4 water or alcohol 15.76 12.40 11.490 2 TM-200S 2.00 2.00 2.000 3 Talc or kaolin 3.00 3.00 3.000 4 Titanium 25-35% of white powder, in order to improve the gloss, add 308 leveling agent 0.1-2.0% as well. 5 Pigments (suitable for lightfast pigments) 8-12.00 8-12.00 8-12.000 6 Antifoaming agent A 0.2-1.00 0.2-1.00 0.3-1.500 7 PH value modifier Suitable quantity Appropriate amount 8 950 Emulsion 24.70 33.00 41.130 9 LJJ film Drying solution 1.0-2.0 0.7-1.5 0.5-1.0 10 Total 100% 100% 100% 11 Ink cost (kg) 13.58 yuan 14.87 yuan 15.73 yuan 12 PH value 8.00 7.75 7.500 Tip:

(A) 1. The ink does not fall off on non-woven fabrics, PVC, woven bags (including cast PE), black and white films (PE), milk film, OPP, etc.; 2. In black and white film (PE), OPP , milk film, etc. can not pull off the tape; 3, non-woven fabric, OPP no scratches and so on. (B) 1, the use of fully stirred for 3-10 minutes before the main can be printed on the machine; 2, dilution recommended: 70% water, alcohol or ester 30%. (4) Keys for LD resin synthesis and application technology 1. Modification requirements for resins 1.1 Precautions for main resins: The main body for the production of LD resin is LX-2 resin: 1 The reaction temperature and time of raw materials during the production of LX-2 resin Control; 2 additives in the esterification process temperature and constant temperature control; 3 after the reaction of acid value and softening point control; 4 solid LX-2 resin after ammonia catalysis and PH value control; 5 non-dielectric choice and Dosage; 6 water injection and viscosity control must be based on the ink or paint film adhesion, water resistance, resistance to rub and choose different additives (such as coupling agents, plasticizers, etc.). 1.2 Auxiliary resin matters needing attention: As LX-2 resin grafted resin, after using D3 resin with excellent iodine value of 80 or so and excellent filming and dryness as auxiliary materials, it is necessary to first consider different solubility and Hydrogen bond solvent, and the type and amount of emulsifier required for modification; 2 Consider catalyzed (drying) neutralizing quality of commonly used ammonia in different proportions + ethanolamine, in order to achieve the appropriate viscosity, transparent appearance, PH value of 7.5- 8.0 technical indicators. 3 It should be made of glue or varnish from resin, and inks with different uses have wider adaptability to printing range, better mutual solubility and product stability, so as to design different grafting amount of LX-2 and D3. The most inexpensive LJJ film-forming drier liquid driers main body comes from disposable plastic foam. 2. Synthetic graft modification after the connection material requirements: The success or failure of water-based connection materials: often PH value determines the quality of downstream products.

The water solubility of 2.1 LD resin is affected by many factors. In general, in order to obtain the water-solubility of the resin, a sufficient amount of hydrophilic groups, such as -COOH, -OH, -NH2, etc., are first introduced into the macromolecular chain. The second is to lower the crystallinity of the polymer. The water solubility of methyl cellulose, ethyl cellulose, etc. is the result of lowering the crystallinity. The use of electrolyte counterion is also an important condition for promoting the water solubility of LD resin. Neutralization and salt formation in the synthesis of water-soluble resins are also the reason. The presence of hydrogen bonds is also a great contributor to the water solubility of LD resins. Many polymers often interact with water molecules through hydrogen bonds to obtain water solubility. Temperature is an important factor influencing the water solubility of LD resins. Sometimes due to the increase in temperature, the thermal motion of the resin reduces the degree of association with water molecules, resulting in decreased solubility and the formation of gels. However, in the selection of most graft modified resins, the solubility increases as the temperature increases, and the solubility becomes better. Of course, the water solubility of LD resin is closely related to the macromolecular structure and molecular weight. Linear polymer molecules can form hydrogen bonds to a maximum extent in water. Thus, linear polymers are more water soluble than branched polymers for the same type of resin. The molecular weight of the polymer increases, and both the solubility and the dissolution rate decrease. This is naturally due to the increase of the molecular weight, which slows down the diffusion of macromolecules in water. At the same time, it also increases the viscosity of the solution due to the increase of the molecular weight, and further increases the resistance of macromolecular movement.

LD water-soluble resin as a film-forming substance for water-based glue, water-based paints, water-based paints, water-based inks, is often used directly in the production process of the above products. Therefore, the water solubility of a water-soluble LD resin is an extremely important property. However, after the water-soluble resin has been used to complete the manufacture of water-based inks or water-based paints or water-based paints, the resin loses water solubility and becomes insoluble after being dried and dehydrated in various forms such as building material coating and packaging printing. The perfect coating or ink layer that melts, this is the curing cross-linking performance of aqueous LD resin. 2.2 Lao Tzu's "action against the Tao". The contradiction is called Dao and Virtue. Dao is an independent existence from all concrete things. "The German was also." From the LD resin reaction modified grafting saw some contradictory rules, especially the two sides of the transformation of the law, in line with Lao Zi's quintessence theory. For example, the introduction of electrolytes (such as non-electrolyte urea) plays a role in pigmentary stabilization. There are hydrogen bonds in aqueous solutions of alcohols, hydroxyls, acids, esters, etc. Boiling point elevation is an example of hydrogen bonding. In formic acid and acetic acid, hydrogen bonding produces dimerization. The surface active short-chain fatty acids and fatty alcohols are amphiphilic substances that are both soluble in water and oil-soluble. In order to reduce the surface tension, an appropriate amount of surfactant (perpendicular to the interface arrangement) sometimes causes the LD resin system to be unstable. It is necessary to introduce a repulsion or a potential threshold to stabilize it - the emulsifier used in the emulsion (eg OP-10). Practice has proved that: In order to increase the molecular weight of LD resin, the resin liquid is exactly opposite to the resin emulsion in dispersion speed and temperature in the dispersion speed and temperature. When LX-2 resin molecules and D3 resin molecules meet, it will produce attractive and repulsive forces, especially when the two resin molecules are close to each other, if the two molecules with opposite charges overlap more than the two molecules with the same charge When it's tight, it creates attractiveness—attachment. When met with UJ film forming driers, it will have a strong attraction to accelerate the film drying of LX2 or LD resin.

Adding TM-200S to Tianyang Chemical Factory can greatly increase the degree of branching of the resin + pigment. We know that when the electrons of two molecules overlap each other, the molecules will repel each other, and as the distance between the molecules shrinks, the repulsive force grows exponentially—exfoliation. This is a summary of two different results after we tested the OPP film and PP braided woven bags and non-woven fabrics. This may be caused by our unscientific use of 100% active agents. The aqueous ink produced by this type of LD resin is also weakly acidic by the small droplets in the system or emulsion, and the optical properties of the colored film (ink film) of this ink - color, transparency, covering (covering) ability, gloss Observation and analysis of the fastness of attachment: It depends on the pigment and on the binder of the aqueous LD resin (including the acid value of the auxiliary, etc.). Their water-based inks are particularly susceptible to pigments with a crystallographic potential, resulting in the ink film being strongly pulled over by another substrate or coating under certain ambient temperature conditions, resulting in the original ink film on the substrate or completely peeled off. net. So far, no new way to increase the bond strength of the untreated non-absorbing polyolefin (such as PE, PP, and PET) without adding a tackifying crosslinker has been found. 2.3 Of course, water-based paints and water-based inks also have a dispersive grinding process whose purpose is to optimize the hue (chroma) and pigment depth. Frequently, a very long dispersion grinding process is used to achieve the maximum color depth, especially when the pigment is very fine, or by increasing the pigment concentration (content) to deepen the color. Make it bright and spread out to create a larger area - maximum surface area and low material cost of the product. In addition to adding additives, the former is to extend the dispersion grinding time, the latter is to increase the proportion of pigment to achieve a certain color depth, and the appropriate amount of control of the PH value is also an important condition to achieve the depth of the color. The purpose of increasing the surface active agent is: not fully stabilized by space or static electricity - indicating that Van der Waals' gravity has not grown. The finer the dispersion (shearing), the more the surface area of ​​the pigment color increases. This is the reason.

2.4 LD resin liquid viscosity properties: 1 small viscosity will result in low production efficiency, the deposition of pinholes, a large area of ​​small pinhole-like, not plain, not smooth, hair imaginary, halo. When the paint is applied (or sprayed) or the ink is printed on a glossy substrate, the adhesion force will be reduced, powdered, and the dust will be removed (bleached). 2 too much viscosity will cause the production can not be successfully cycled dispersed grinding, brushing, printing can not flow smoothly film, scratches, bite color, paste version, from the orange peel, the film drying process is slow and so on. 3Incorrect addition of coagents is not conducive to the cohesive strength of film-coated composite films after printing. Remarks: Basic requirements for printing performance: The solubility, re-solubility, water resistance, scratch resistance, and rub resistance of inks are the minimum requirements for packaging printing plates after they are imprinted or transferred to substrates. The ink remaining on the printing plate can be re-dissolved in the ink hopper or can again, and the complete solvent (including water) releasability. It not only can hold a certain amount of plasticizer after drying, but also does not penetrate or migrate, heat resistance (heat sealing process), abrasion resistance, washing resistance, alcohol resistance, freezing resistance, etc. Because the drying of the ink produced by the LD resin is the evaporation of the solvent (including most of the water) to complete the film printing and drying of the packaging printing ink, so the appropriate amount of alcohol, ester, hydrocarbon solvent and water solvent matching technology is used. It is scientific to use slow, medium, and fast mixed solvents for printing and printing plates, substrates, and printer speeds. In order to speed up the printing speed, it is also feasible to increase the PH value and assemble micro electromagnetic waves on the print. Excessive increase in pH tends to reduce the water resistance of the ink film and coating film.

(5) Conclusions The modified grafting method of L-D resin through the use of technology shows the advantages of the environmental protection of the waterborne resin, wide source of material, simple production process, low product cost, and large application range. However, in the pursuit of lighter connection materials, lower viscosity, and rapid drying, the water solvents are likely to remain and appear to quit. However, the alcohol organic solvents can easily “run away” and often cause the adhesion of the coating film or ink film to be reduced. Or poor surface gloss. The pH and release properties of both LD resin solutions are very important. Otherwise, it will stick into clumps, residual odors, initial tack and tackiness, dyeing or discoloration. In particular, when a printed film is printed in conformity with printing, bubbles are often generated, and the peel strength is low.