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Wet-process polyurethane resin as well as preparation method and application thereof

A wet-process polyurethane and resin technology, applied in the field of polyurethane resin, can solve the problems of the backside of the substrate, the shelling on both sides of the compatible substrate, and the degradation of the grade, so as to achieve good hydrolysis resistance, good anti-siphon effect, and increase the processing range. Effect

Active Publication Date: 2022-04-12
福建汇得新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding water-repellent to the scratching resin and impregnating resin is very easy to cause the back of the substrate to bloom and the phenomenon of water ripples on the front, and it is necessary to add an additional leveling agent to solve the above problems
In addition, because the coating resin and the impregnating resin are generally not the same type of resin, compatibility problems are prone to occur, resulting in shelling on both sides of the substrate or excessively large cells at the bottom, which will affect physical properties, which will result in low quality products and lower grades. and so on

Method used

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  • Wet-process polyurethane resin as well as preparation method and application thereof
  • Wet-process polyurethane resin as well as preparation method and application thereof

Examples

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preparation example Construction

[0040] The present invention also proposes a kind of preparation method of wet process polyurethane resin, and described preparation method comprises the following steps:

[0041] Step 1: Prepolymerize dimer acid polyester diol, part of diphenylmethane-4,4'-diisocyanate and part of N,N-dimethylformamide until the viscosity of the reaction solution reaches At 100-180Pa·s (such as 100Pa·s, 120Pa·s, 140Pa·s, 160Pa·s or 180Pa·s) at 50°C, the prepolymerization reaction is over, and then the chain extender and the remaining N,N-di Methylformamide, after reacting for 1-2h (such as 1h, 1.5h, or 2h), add the remaining diphenylmethane-4,4'-diisocyanate to continue the reaction, when the final viscosity of the reaction solution is 100 at 25°C When ~300Pa·s (such as 100Pa·s, 150Pa·s, 200Pa·s, 250Pa·s or 300Pa·s), the reaction is terminated to obtain the first component;

[0042] Step 2: Mix dimer acid polyester diol, toluene diisocyanate and N,N-dimethylformamide, heat it to react under ...

Embodiment 1

[0052] The wet-process polyurethane resin of the present embodiment is prepared through the following steps:

[0053] (1) Preparation of dimer acid polyester diol: mix dimer acid and 2-butyl-2-ethyl-1,3-propanediol according to the molar ratio = 1:1.4, stir and heat up to 150 ℃, after reacting for 3 hours, gradually raise the temperature to 200℃, react for another 2 hours, add the catalyst tetrabutyl titanate, react for 2 hours, vacuumize and react for 4 hours, until the acid value is lower than 0.5mg KOH / g, and the hydroxyl value is 56mgKOH / g , cooling and discharging to obtain dimer acid polyester diol.

[0054] (2) Preparation of the first component: 185kg of dimer acid polyester diol, 21.8kg of diphenylmethane-4,4'-diisocyanate and 128kg of N,N-dimethylformamide were prepolymerized, The reaction temperature was controlled at 75°C. After 1.5 hours of reaction, when the viscosity of the reaction liquid reached 50°C and 100 Pa·s, 13.34kg of ethylene glycol, 2.42kg of 1,4-but...

Embodiment 2

[0058] The wet-process polyurethane resin of the present embodiment is prepared through the following steps:

[0059] (1) Preparation of dimer acid polyester diol: mix dimer acid and diethylpentanediol at a molar ratio of 1:1.1, stir and heat up to 140°C under nitrogen protection, and gradually heat up to 140°C after reacting for 5 hours. 220°C, react for another 3 hours, add catalyst tetrabutyl titanate, react for 3 hours, vacuumize and react for 6 hours, when the acid value is lower than 0.5 mg KOH / g, and the hydroxyl value is 28 mg KOH / g, cool down and discharge to obtain di Polyacid polyester diol.

[0060] (2) Preparation of the first component: Prepolymerize 160kg of dimer acid polyester diol, 9.6kg of diphenylmethane-4,4'-diisocyanate and 113kg of N,N-dimethylformamide, and react The temperature was controlled at 80°C. After 2.5 hours of reaction, when the viscosity of the reaction liquid reached 120 Pa·s at 50°C, 18.84kg of ethylene glycol and 565kg of N,N-dimethylfor...

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Abstract

The invention provides wet-process polyurethane resin as well as a preparation method and application thereof. The wet-process polyurethane resin comprises a first component and a second component, and the weight ratio of the first component to the second component is (9: 1)-(13: 1); wherein the first component is prepared from the following raw materials: dimer acid polyester glycol, diphenylmethane-4, 4 '-diisocyanate, a chain extender and N, N-dimethylformamide; and the second component is prepared from the following raw materials: dimer acid polyester glycol, toluene diisocynate, trifunctional polyhydric alcohol, monohydroxy organic silicon and N, N-dimethylformamide. The wet-process polyurethane resin provided by the invention has good anti-siphon effect and hydrolysis resistance, and can be used as both coating resin and impregnation resin.

Description

technical field [0001] The invention belongs to the technical field of polyurethane resins, and in particular relates to a wet-process polyurethane resin and its preparation method and application. Background technique [0002] The high-end sports shoe leather commonly used in the market generally adopts the wet on wet process (the wet on wet process is to impregnate the non-woven fabric through an impregnation tank, directly coat a layer of squeegee without solidification, and then pass it through solidification. , washing, and drying to obtain a wet base), because the back of the synthetic leather base made by this process has an effect similar to genuine leather, and its sensual elasticity is better than that of the traditional Dipping+Coating process (that is, the base fabric is first passed through Impregnation treatment in the impregnation tank, coating a layer of coating resin after solidification, and then solidification, washing and drying to obtain a wet substrate)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/42C08G18/32C08G18/28D06N3/14D06M15/572
Inventor 钱洪祥钱建中巩倩黄凯华宋蒋龄赵立朋
Owner 福建汇得新材料有限公司
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