Anti-curling low-solidification-rate PU resin and preparation method thereof

A PU resin, low solidification technology, applied in coatings, textiles and papermaking, etc., can solve the problems of wasting manpower and material resources of synthetic leather factories, soft synthetic leather, darkened surface gloss, etc., and achieve good resilience performance , excellent physical properties and high economic value

Active Publication Date: 2020-06-12
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the solidification rate is fast, the wet-laid bass is easy to curl (and a whole piece of cloth with warped edges), which hinders the next operation. At this time, it needs to be ironed at high temperature. If the wet-laid bass It may take 4-5 times of high-temperature ironing for severe curling, which greatly wastes the manpower and material resources of the synthetic leather factory.
There are also various anti-curling additives in the market. In the experiment, we found that after adding these anti-curling additives to the synthetic resin, the hand feel of the synthetic leather became softer, the surface luster became darker, and the pores The structure has also become much larger

Method used

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  • Anti-curling low-solidification-rate PU resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Take 250g of 4000 molecular weight polyester polyol (PEBA-4000) and put it into a 2000mL glass reactor, then add 0.001g of phosphoric acid, 0.2g of antioxidant BHT, 44g of BDO and 500g of solvent DMF into it, and stir thoroughly for 30min Then put in MDI (R value is set to 1), and then raise the temperature to 75-80°C to make it react to increase viscosity. During the reaction process, a small amount of MDI can be added in an appropriate amount. During the thickening process, DMF is continuously added to the reactor for dilution. After the thickening reaction is completed, methanol is used to terminate the reaction. Half an hour after the methanol is terminated, 0.5g of malic acid is added to prevent it from reducing viscosity. After continuing to stir for 1 hour, pack the resin in the glass reactor. The final viscosity of the resin is 200,000-240,000 (cps / °C), and the solid content is 29.5-30.5%. The resin is named JF-1.

Embodiment 2

[0023] Embodiment 2: Get 250g 4000 molecular weight polyester polyol (PBHA-4000) and drop in the 2000mL glass reactor, then add 0.001g phosphoric acid, 0.2g antioxidant BHT, 30.3g EG and 500g solvent DMF to it respectively, fully After stirring for 30 minutes, add MDI (set the R value to 1), and then raise the temperature to 75-80°C to make it react to increase viscosity. During the reaction process, a small amount of MDI can be added in an appropriate amount. During the thickening process, DMF is continuously added to the reactor for dilution. After the thickening reaction is completed, methanol is used to terminate the reaction. Half an hour after the methanol is terminated, 0.5g of malic acid is added to prevent it from reducing viscosity. After continuing to stir for 1 hour, pack the resin in the glass reactor. The final viscosity of the resin is guaranteed to be 200,000-240,000 (cps / °C), and the solid content is 29.5-30.5%. The resin is named JF-2.

Embodiment 3

[0024] Example 3: Put 250g of 4000 molecular weight polyester polyol (125g PEBA-4000+125g PBHA-4000) into a 2000mL glass reactor, and then add 0.001g of phosphoric acid, 0.2g of antioxidant BHT, and 20.2g of EG , 14.6g BDO and 500g solvent DMF, stir well for 30min and then put into MDI (R value is set to 1), then raise the temperature to 75-80°C to make it react to increase viscosity. During the reaction process, a small amount of MDI can be added in an appropriate amount. During the thickening process, DMF is continuously added to the reactor for dilution. After the thickening reaction is completed, methanol is used to terminate the reaction. Half an hour after the methanol is terminated, 0.5g of malic acid is added to prevent it from reducing viscosity. After continuing to stir for 1 hour, pack the resin in the glass reactor. The final viscosity of the resin is guaranteed to be 200,000-240,000 (cps / °C), and the solid content is 29.5-30.5%. The resin is named JF-3.

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Abstract

The invention relates to an anti-curling low-solidification-rate PU resin and a preparation method thereof. The preparation method comprises the steps: 1, adding polyester polyol into a reaction kettle, adding phosphoric acid, an antioxidant, a dihydric alcohol chain extender and N, N-dimethylformamide, and stirring and mixing the mixture uniformly; 2) adding isocyanate, heating the mixture to 75-80 DEG C, and carrying out a tackifying reaction until the viscosity of the system reaches 200,000-240,000 cps / DEG C; and 3) after the tackifying reaction, adding methanol to terminate the tackifyingreaction, then adding malic acid, stirring the mixture for 1h, and discharging the product. The preparation method provided by the invention adopts a one-step method, the synthesis process is simple and convenient, the prepared PU resin has good resilience, and the PU wet base prepared from the PU resin has the functions of edge curling prevention and low solidification rate.

Description

technical field [0001] The invention relates to the field of PU resin preparation, in particular to an anti-curling low solidification rate PU resin and a preparation method thereof. Background technique [0002] The resin for PU leather has been widely sought after by people in recent years because of its wide source of raw materials, low price, multi-function and hand feeling not inferior to genuine leather. Resin for PU leather can be divided into wet method and dry method resin. Wet method resin is to mix PU resin with wood powder, calcium powder and other fillers and disperse evenly at high speed, apply it on the surface of the base fabric, then solidify it in water, and dry it under pressure. And so on, you can make a wet bass. The main physical properties of wet bass are: resilience, thickness, peel strength, fullness, softness, Q elasticity, cell structure and solidification rate, etc. Add a small amount of color chips to the dry process resin, mix it into the DMF ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32D06N3/14
CPCC08G18/7671C08G18/664C08G18/4238C08G18/3206D06N3/147D06N3/146D06N2203/068D06N2211/28
Inventor 王雯王元有刘玉婷刘雨婷贾生超
Owner YANGZHOU POLYTECHNIC INST
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