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Cold-resistant moisture-curable leather polishing coating agent

A technology of moisture curing and finishing agent, which is applied in coatings, polyurea/polyurethane coatings, devices for coating liquids on surfaces, etc. It can solve the problems of poor bending resistance at low temperature and achieve strong crystal sense and good visual effect , The effect of excellent low temperature bending resistance

Active Publication Date: 2010-10-06
JIANGSU BAOZE POLYMER MATERIAL
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AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned technical scheme, a special class of polyol is adopted: 1,4-hexanediol. After a long-term experiment and exploration by the inventor, it is found that this type of polyol can significantly improve the performance of leather bright finishing agents, especially moisture-curing leather finishing agents. The performance of low-temperature bending resistance overcomes the disadvantage of poor low-temperature bending resistance of the existing moisture-curing leather finishing agents; in addition, the polyurethane prepolymer is cured and cross-linked with water molecules in the air to form a high-strength polyurethane-polymer The urea structure ensures strong folding resistance at room temperature; moreover, the polyurethane prepolymer has free isocyanate groups, which are released when the polyurethane prepolymer and the moisture in the air undergo curing and crosslinking reactions. The isocyanate group and the polyurethane prepolymer chemically react with the active amino groups on the surface of the adhesive (leather) to form chemical bonds and hydrogen bonds. These multiple chemical effects make the leather coated with the material show a strong crystal sense, high Gloss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A cold-resistant moisture-curing leather bright finish agent, the raw material components are weighed according to the following weight ratio: toluene diisocyanate 17.5%, diphenylmethane diisocyanate 4%, 1,4 hexanediol 32%, low-grade Trihydric alcohol 3.5%, butyl acetate 19.5%, xylene 23%, antioxidant 0.2%, stabilizer 0.1%, leveling agent 0.2%.

[0017] The production process of the cold-resistant type moisture curing leather bright finish agent, the specific steps are as follows:

[0018] ①: Put toluene diisocyanate, diphenylmethane diisocyanate, 1,4 hexanediol, lower trihydric alcohol, antioxidant and half of the solvent (mixture of butyl acetate and xylene) into the reaction kettle and heat to 80°C Left and right, stirred for about 12 hours until the end of the reaction was detected;

[0019] ②: Add the remaining half of butyl acetate and xylene to the reaction kettle and stir for half an hour;

[0020] ③: Add stabilizer and leveling agent to the cooled reaction ke...

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Abstract

The present invention provides a cold-proof moisture curable leather polishing finishing agent, including polyurethane prepolymer, wherein, polyurethane prepolymer is prepared by diisocyanate, 1, 4 hexanediol and initiator in the presence of organic solvent, polyurethane prepolymer has free isocyanato. The invention overcomes the problem of worse lower temperature tortuosity resistance of the present moisture curable leather finishing agent, compared with the prior art, not only having excellent lower temperature tortuosity resistance, but also achieving high brightness and strong crystal feel after coating on the leather, having better visual effect.

Description

technical field [0001] The invention relates to a leather finishing agent, in particular to a room-temperature moisture-curable leather finishing agent, in particular to a cold-resistant type, that is, a moisture-curable bright leather finishing agent resistant to twists and turns at low temperatures. Background technique [0002] At present, bright finishing agent products in the synthetic leather market are becoming a popular trend in the future, and are widely used in luggage, clothing, and footwear products. [0003] After the general leather surface finishing agent is painted on the leather, it needs to be dried and then processed. However, the moisture-curing leather surface finishing agent is different. It is mainly composed of polyurethane prepolymer. After the leather is coated with this material, it does not need to be dried. It can be placed directly in the air (or appropriately increase the air humidity and temperature), the dry time is 2 to 4 hours, and it takes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04B05D7/12
Inventor 时云刚
Owner JIANGSU BAOZE POLYMER MATERIAL
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