PU adhesive for single-component microfiber leather and preparation method of PU adhesive

A microfiber leather, one-component technology, applied in the directions of adhesive additives, non-polymer adhesive additives, adhesive types, etc., can solve the problems of poor adhesion, no resin adhesion, etc. Excellent, good adhesion, good hydrolysis resistance

Active Publication Date: 2020-07-10
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most PU adhesives on the market are mainly wet paste. Normal PU adhesives will have poor adhesion after being baked in an oven at 110°C for 3 minutes, or the resin will be completely dried without adhesion.

Method used

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  • PU adhesive for single-component microfiber leather and preparation method of PU adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: 400 g of polyhexamethylene adipate diol (molecular weight: 2000) was weighed and added into a three-necked flask, and the reaction temperature was raised to 110° C. to melt it, and at the same time, water removal treatment was carried out. Then add 0.02g antioxidant and 0.003g phosphoric acid and stir well therein, then add 50g of molten isocyanate MDI (R value is set to 1). Stir at high speed to make it viscosifying reaction, the reaction temperature is about 110 ℃, add the organic solvent N,N-dimethylformamide to dilute during the viscosifying process. Another organic solvent, isopropanol, was added after the reaction was finished and the mixture was stirred for 1 h. The solid content of the prepared PU adhesive is controlled to be 40%, and the viscosity is 80,000 to 120,000 (cps / °C). Wherein, the mass ratio of the used solvent N,N-dimethylformamide to isopropanol is 4:1.

Embodiment 2

[0029] Example 2: 400 g of polybutylene adipate diol (molecular weight: 2000) was weighed and added into a three-neck flask, the reaction temperature was raised to 110° C. to melt, and water removal treatment was carried out at the same time. Then add 0.02g of antioxidant and 0.003g of phosphoric acid and stir well therein, then add 42g of molten isocyanate NDI (R value is set to 1). Stir at high speed to make it viscosifying reaction, the reaction temperature is about 110 ℃, add the organic solvent N,N-dimethylformamide to dilute during the viscosifying process. Add another organic solvent, acetone, to continue stirring for 1 h after the reaction is complete. The prepared PU adhesive has a solid content of 40% and a viscosity of 80,000-120,000 (cps / °C). Wherein, the mass ratio of the used solvent N,N-dimethylformamide to acetone is 4:1.

Embodiment 3

[0030]Example 3: Weigh 400 g of polyhexamethylene sebacate diol (molecular weight: 2000) and add it into a three-necked flask. The reaction temperature is raised to 110° C. to melt it, and at the same time, water removal treatment is carried out. Then add 0.02g of antioxidant and 0.003g of phosphoric acid and stir well therein, then add 48.9g of molten isocyanate TMXDI (R value is set to 1). Stir at high speed to make it viscosifying reaction, the reaction temperature is about 110 ℃, add the organic solvent N,N-dimethylformamide to dilute during the viscosifying process. After the reaction, another organic solvent butanone was added to continue stirring for 1 h. The prepared PU adhesive has a solid content of 40% and a viscosity of 80,000-120,000 (cps / °C). Wherein, the mass ratio of the used solvent N,N-dimethylformamide to butanone is 4:1.

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Abstract

The invention relates to a PU adhesive for single-component microfiber leather and a preparation method of the PU adhesive. The preparation method comprises the following steps: adding polyester polyol into a reaction bottle, heating to melt the polyester polyol, adding an antioxidant BHT and phosphoric acid, uniformly stirring, adding molten isocyanate, reacting at 110 DEG C, adding an organic solvent in the reaction process for dilution, and reacting until the viscosity of the system reaches 80,000-120,000 cps / DEG C; and adding another organic solvent into the reaction bottle so as to adjustthe solid content of the system to 40%, continuously stirring for 1 hour, and packaging. The PU adhesive for the single-component microfiber leather prepared by the scheme has the advantages of simple process, convenience in operation and the like; the prepared PU adhesive is low in softening point, has good hydrolysis resistance, heat resistance and mildew resistance and is suitable for dry sticking, and when the PU adhesive is used for microfiber veneering, the matte phenomenon is avoided.

Description

technical field [0001] The invention relates to the field of leather adhesives, in particular to a single-component microfiber leather PU adhesive and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, higher requirements are put forward for daily necessities. The hand feel and physical properties of common types of wet-dry PU synthetic leather have gradually failed to meet people's needs for high-quality life. At this time, polyurethane microfiber leather came into being. Compared with different types of polyurethane synthetic leather, microfiber leather has a fleshy and icy feeling that is closer to or even surpasses real leather. At the same time, because the microfiber leather presents a three-dimensional hole structure similar to that of genuine leather, the waterproof and breathable performance of the microfiber leather is better. The preparation method of microfiber leather is similar to that of ordinary P...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J11/06C08G18/42C08G18/76
CPCC09J175/06C09J11/06C08G18/4238C08G18/7671C08G18/7678C08G18/7642C08K5/13
Inventor 王元有贾生超王雯门育龙王元帅
Owner YANGZHOU POLYTECHNIC INST
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