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Soft non-adhesive wet polyurethane resin and preparation method thereof

A polyurethane resin, non-adhesive technology, used in textiles and papermaking, etc., can solve the problem of sticky leather surface, and achieve the effect of plump leather surface and soft hand feeling

Active Publication Date: 2013-08-07
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide a kind of soft non-adhesive wet polyurethane resin and its preparation method, in order to solve the defect that the leather surface is sticky after ordinary soft polyurethane resin is made into leather

Method used

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  • Soft non-adhesive wet polyurethane resin and preparation method thereof
  • Soft non-adhesive wet polyurethane resin and preparation method thereof
  • Soft non-adhesive wet polyurethane resin and preparation method thereof

Examples

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Embodiment 1

[0026] The raw materials and proportioning of the present embodiment polyurethane resin are as follows:

[0027]

[0028]

[0029] Wherein the number average molecular weight of polyethylene adipate diethylene glycol 1,4-butylene glycol ester diol is 3000 ± 300g / mol; The average molecular weight is 2000±200g / mol. The moisture content of each raw material is less than 500ppm.

[0030] The preparation method of the present embodiment polyurethane resin is as follows:

[0031] 1, drop into polyethylene adipate diethylene glycol 1,4-butanediol ester diol, polyethylene adipate diethylene glycol ash diol, antioxidant I- Mix 1010 and 30% DMF, stir for 10-20 minutes, then add 20% MDI, react at 70-80°C for more than 2 hours to obtain a prepolymer solution with a solid content of 60-65% and a viscosity of 40-50Pa ·S / 70-80℃ prepolymer solution, NCO / OH in the prepolymer solution is 0.88-0.92.

[0032] 2. Add 50% DMF to the prepolymer solution and stir for 10 minutes, then add sm...

Embodiment 2

[0035]

[0036] Wherein the number average molecular weight of polyethylene adipate diethylene glycol 1,4-butylene glycol ester diol is 3000 ± 300g / mol; The average molecular weight is 2000±200g / mol. The moisture content of each raw material is less than 500ppm.

[0037] The preparation method of the polyurethane resin in this example is the same as in Example 1, except that the small molecular diol chain extender in step 2 is composed of ethylene glycol and 1,4-butanediol.

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Abstract

The invention discloses a soft non-adhesive wet polyurethane resin and a preparation method thereof. The preparation method comprises the following steps: mixing polyalcohol mixture, antioxidant I-1010 and MDI (methylenediphenyl diisocyanate) to carry out prepolymerization reaction; adding micromolecular dibasic alcohol to carry out chain extension, wherein a reactive organosilicon releasing agent is added to enter into the reaction in the reaction process; supplementing the solvent according to the viscosity of the system to obtain a polymer solution of which the viscosity is 120-220 Pa.S / 25DEG C; and adding a terminator and the rest of assistants into the polymer solution while controlling the solid content at 30+ / -1% and the viscosity at 120-220 Pa.S / 25 DEG C. The soft non-adhesive wet polyurethane resin overcomes the defect of high adhesion tendency after forming leather in the existing common soft polyurethane resin. The synthetic leather made from the soft non-adhesive wet polyurethane resin feels soft and plump, and the leather surface is not adhesive.

Description

1. Technical field [0001] The invention relates to a soft non-adhesive wet-type polyurethane resin and a preparation method thereof, which is a wet-type polyurethane resin for sofa leather, garment leather and glove leather. 2. Background technology [0002] Due to the limited natural resources and high prices of leather products, it cannot meet the growing market demand. Polyurethane synthetic leather products have a wide range of raw materials, cheap prices, good processing performance, and are getting closer to the characteristics of natural leather, fully satisfying people's life pursuits. At present, sofa leather, clothing leather, and glove leather require soft hand feeling. However, due to the chemical structure characteristics of soft low modulus wet polyurethane resin, its modulus is low and the hand feel is soft, but at the same time, the leather surface is prone to stickiness after the resin is made into leather. defects, thus affecting the subsequent processing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/12D06N3/14
Inventor 吴兴保惠坚强刘永福田海英汪青山
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL