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Paint Printing and Thickening Agent Type Development History
Release Date：2018-6-19 Source：xiashundong Views：879
Coating glue printing is a glue printing method in which a polymer compound forms a film on a fabric and the pigment is fixed on the fabric. The addition of a thickening agent to the paste printing paste increases its viscosity, lowers its fluidity, and makes it pseudoplastic. Under the action of shearing force, the viscosity drops, and it easily leaks from the mesh of the printing and dyeing screen to the printing and dyeing fabric. After the shear force is lost, the viscosity can be added, and can remain in situ without penetrating into other parts of the fabric. Second, The pulp spreads on the fabric surface and the yarns in the fabric are not bonded, which is beneficial to the hand feeling. This rheological property of the printing paste makes the adhesive self-crosslinking or diplomatic linkage to tightly bond the paint particles to each other and can improve Resistance to collision and washing fastness. So the nature of the thickener determines the paste printing function of the paste printing paste, and also directly affects the quality of the glue printing product. In the coating paste printing, glue and color are used. Two primary materials for pulp. As the consistency of the paste is reduced during the paste printing process, thickeners are used to increase the consistency of the coating paste printing materials. In this case, thickeners for paste printing are used.
The primary effect of paste printing thickeners is to provide outstanding rheological functions. Transfer printing screens, pastes or color pastes on printing rolls to fabrics, and link dyes and fibers together to ensure a clear overview of paste printing patterns. The pattern is clear, colorful and uniform; when the dye is fixed, the reaction product and residue are easily removed in the downstream process, making the fabric soft to the touch. Visible, paste printing thickener plays a proper main effect in the glue printing industry.
Speaking of paste printing thickeners, there is still a long history of development. The paste used long ago was starch or modified starch. This kind of thickening agent is called as natural thickener. However, this kind of coating paste printing thickener has the advantages of high cost, low color depth and vividness. Poor, wash fastness is also very poor, fabric feel is not satisfactory. At present, these thickeners have been gradually selected. From the thick pasteurizers of the 1950s to the synthetic thickeners of the 70th generation, the effectiveness of thickeners in the paste printing process was not questioned.
The nature of the paste printing thickener determines the paste printing function of the paste printing paste and also directly influences the quality of the paste printing product. Therefore, in the coating paste printing, it is crucial to select the correct thickener. The customer must select the most suitable glue printing from the quality stability function of the product, the amount of increase, and the quoting and other inductive factors. Thickeners, as long as they can produce higher-cost products.
1. Natural thickener
The use of natural thickeners with high cost, color depth, brilliance, wash fastness and fabric feel is not satisfactory, and has now gradually been eliminated.
2. Emulsifying thickener
The A-plasma thickener used in the 1950s and 1960s was composed of two liquids that could not be mixed (such as hydrocarbons (oil phase) and water (water phase)) emulsified by high-speed emulsifiers and are still in the process of emulsification. The use of emulsified paste N and emulsified paste MA state paste has the following disadvantages: (1) the consistency of the paste printing paste is difficult to adjust; (2) the evaporation of hydrocarbons during drying and baking, there is a risk of explosion; (3) the oven Exhausted hydrocarbons cause serious pollution to the atmosphere; (4) Residual hydrocarbon odor on textiles after paste printing.
3. Synthetic thickener
In the early 1990s, thickeners were formed to deal with pollution and safety problems, and they were convenient for transportation and storage, simple in manufacturing, clear in outline, and bright in color. Thickeners were classified into two categories, nonionic and anionic.
3.1 Non-ionic thickeners
The non-ionic thickeners are mostly polyethylene glycol ether derivatives. The main products are Lntexal HVW from BASF, Germany, Ryuclve Reclucer 400 cone from Japan Dainippon Ink, and Emulsur M. Shanghai Additives Plant Co., Ltd. of Matsui Pigment from Japan. The thickener M is esterified by fatty acid and polyethylene glycol and then re-emulsified. to make.
The electrolyte has no influence on the non-ionic thickener, and its adaptability is good, but the thickening effect is less than that of the anionic thickener. Therefore, the amount is relatively large, and the use of kerosene and other hydrocarbons is still required to manufacture the paste printing paste, which restricts its further development. .
3.2 Anionic thickener
The anionic thickener is a polymer electrolyte compound, which is rich in many ionizable carboxyl groups in the molecule and is a kind of copolymer with a slight degree of cross-linking. It is characterized by low viscosity, strong thickening ability, good stability, and low resistance to mildew. Low thixotropy, its viscosity is minimally affected by the shear rate, good leveling, good anti-splash, low impact on gloss, can be used for light thickened goods, in the printing paste does not use hydrocarbons, but the electrolyte Sensitive and poorly adaptable.
3.3 Dispersion liquid thickener
Dispersion liquid thickeners consist of very small (about 1 μm) dehydrated polymer particles dispersed in a lazy hydrocarbon carrier oil, rich in common stabilizers and emulsifiers. Commonly used lazy hydrocarbon carrier oils are light mineral oils and the like. The size of the fine polymer particles in the dispersion, the size of the dispersion, and the uniformity thereof are superior to those of the solid material that is ground and dispersed in the liquid. The particle diameter of the thickener in alkaline water can be increased from 1 μm to 10 μm and the volume is increased by 1 000 times.
Nowadays, the main position in the domestic market is the thickener Alcoprint PTF (liquid dispersion type) produced by the British colloidal company. It is based on polyacrylic acid of high molecular mass and neutralized with a suitable alkali agent (such as ammonia). Ammonium polyacrylate, viscosity added. The polymer has a micro-cross-linked structure that swells in water and floats in the liquid phase, constrains intermolecular activity, increases viscosity, and is similar in rheology to emulsifying paste. The role. Now there are liquid bulk products in China, such as Ji Lanqin QY-1 thickener developed by the polyacrylic acid dispersion. The paste is convenient, the original paste and paste stability, can be stored for a long time; pass the test Thickening effect is better than PTF; resistance to electrolysis, rheological similar to PTF, are attributed to pseudoplastic fluid, suitable for flat screen or circular screen glue printing, no seizure appearance, no need to add anti-penetration agent.
3.4 Synthesis
Most of the printing and dyeing thickeners are micro-cross-linked polymers that are insoluble in water and can only swell and swell to provide a thickening effect. The method of obtaining the polymer particles having a particle size that satisfies the requirements is the best. The methods include emulsion polymerization, inverse emulsion polymerization and precipitation polymerization.
The primary effect of paste printing thickeners is to provide outstanding rheological functions. Transfer printing screens, pastes or color pastes on printing rolls to fabrics, and link dyes and fibers together to ensure a clear overview of paste printing patterns. The pattern is clear, colorful and uniform; when the dye is fixed, the reaction product and residue are easily removed in the downstream process, making the fabric soft to the touch. Visible, paste printing thickener plays a proper main effect in the glue printing industry.
Speaking of paste printing thickeners, there is still a long history of development. The paste used long ago was starch or modified starch. This kind of thickening agent is called as natural thickener. However, this kind of coating paste printing thickener has the advantages of high cost, low color depth and vividness. Poor, wash fastness is also very poor, fabric feel is not satisfactory. At present, these thickeners have been gradually selected. From the thick pasteurizers of the 1950s to the synthetic thickeners of the 70th generation, the effectiveness of thickeners in the paste printing process was not questioned.
The nature of the paste printing thickener determines the paste printing function of the paste printing paste and also directly influences the quality of the paste printing product. Therefore, in the coating paste printing, it is crucial to select the correct thickener. The customer must select the most suitable glue printing from the quality stability function of the product, the amount of increase, and the quoting and other inductive factors. Thickeners, as long as they can produce higher-cost products.
1. Natural thickener
The use of natural thickeners with high cost, color depth, brilliance, wash fastness and fabric feel is not satisfactory, and has now gradually been eliminated.
2. Emulsifying thickener
The A-plasma thickener used in the 1950s and 1960s was composed of two liquids that could not be mixed (such as hydrocarbons (oil phase) and water (water phase)) emulsified by high-speed emulsifiers and are still in the process of emulsification. The use of emulsified paste N and emulsified paste MA state paste has the following disadvantages: (1) the consistency of the paste printing paste is difficult to adjust; (2) the evaporation of hydrocarbons during drying and baking, there is a risk of explosion; (3) the oven Exhausted hydrocarbons cause serious pollution to the atmosphere; (4) Residual hydrocarbon odor on textiles after paste printing.
3. Synthetic thickener
In the early 1990s, thickeners were formed to deal with pollution and safety problems, and they were convenient for transportation and storage, simple in manufacturing, clear in outline, and bright in color. Thickeners were classified into two categories, nonionic and anionic.
3.1 Non-ionic thickeners
The non-ionic thickeners are mostly polyethylene glycol ether derivatives. The main products are Lntexal HVW from BASF, Germany, Ryuclve Reclucer 400 cone from Japan Dainippon Ink, and Emulsur M. Shanghai Additives Plant Co., Ltd. of Matsui Pigment from Japan. The thickener M is esterified by fatty acid and polyethylene glycol and then re-emulsified. to make.
The electrolyte has no influence on the non-ionic thickener, and its adaptability is good, but the thickening effect is less than that of the anionic thickener. Therefore, the amount is relatively large, and the use of kerosene and other hydrocarbons is still required to manufacture the paste printing paste, which restricts its further development. .
3.2 Anionic thickener
The anionic thickener is a polymer electrolyte compound, which is rich in many ionizable carboxyl groups in the molecule and is a kind of copolymer with a slight degree of cross-linking. It is characterized by low viscosity, strong thickening ability, good stability, and low resistance to mildew. Low thixotropy, its viscosity is minimally affected by the shear rate, good leveling, good anti-splash, low impact on gloss, can be used for light thickened goods, in the printing paste does not use hydrocarbons, but the electrolyte Sensitive and poorly adaptable.
3.3 Dispersion liquid thickener
Dispersion liquid thickeners consist of very small (about 1 μm) dehydrated polymer particles dispersed in a lazy hydrocarbon carrier oil, rich in common stabilizers and emulsifiers. Commonly used lazy hydrocarbon carrier oils are light mineral oils and the like. The size of the fine polymer particles in the dispersion, the size of the dispersion, and the uniformity thereof are superior to those of the solid material that is ground and dispersed in the liquid. The particle diameter of the thickener in alkaline water can be increased from 1 μm to 10 μm and the volume is increased by 1 000 times.
Nowadays, the main position in the domestic market is the thickener Alcoprint PTF (liquid dispersion type) produced by the British colloidal company. It is based on polyacrylic acid of high molecular mass and neutralized with a suitable alkali agent (such as ammonia). Ammonium polyacrylate, viscosity added. The polymer has a micro-cross-linked structure that swells in water and floats in the liquid phase, constrains intermolecular activity, increases viscosity, and is similar in rheology to emulsifying paste. The role. Now there are liquid bulk products in China, such as Ji Lanqin QY-1 thickener developed by the polyacrylic acid dispersion. The paste is convenient, the original paste and paste stability, can be stored for a long time; pass the test Thickening effect is better than PTF; resistance to electrolysis, rheological similar to PTF, are attributed to pseudoplastic fluid, suitable for flat screen or circular screen glue printing, no seizure appearance, no need to add anti-penetration agent.
3.4 Synthesis
Most of the printing and dyeing thickeners are micro-cross-linked polymers that are insoluble in water and can only swell and swell to provide a thickening effect. The method of obtaining the polymer particles having a particle size that satisfies the requirements is the best. The methods include emulsion polymerization, inverse emulsion polymerization and precipitation polymerization.