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Waterborne polyurethanes, matte waterborne polyurethane and preparing methods

A water-based polyurethane, matte technology, applied in polyurea/polyurethane coatings, animal husbandry, chemical treatment of small raw hides/large raw hides/leather skins/furs, etc., can solve poor water resistance and abrasion resistance, poor wettability, and low gloss and other issues, to achieve good water resistance, improve wettability, and good flexibility

Pending Publication Date: 2019-04-16
浙江诚迅新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current water-based polyurethane mostly uses polyether polyol as a monomer, which has poor water resistance and abrasion resistance; and its wettability is poor. Although a low-gloss effect can be obtained by adding a matting agent such as silicon dioxide, it will fade with time. Over time, these matting agent particles are easily peeled off from the coating film, thereby negatively affecting the weather resistance and UV resistance of the coating film

Method used

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  • Waterborne polyurethanes, matte waterborne polyurethane and preparing methods
  • Waterborne polyurethanes, matte waterborne polyurethane and preparing methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of water-based polyurethane is prepared through the following steps:

[0033] (1) Heat 40g of diethylaminoethanol to 110°C in a vacuum environment for dehydration treatment for 1.5h (dehydration treatment is a conventional technical means in this field), then add 35g of isocyanic acid, and react for 1h at 75°C, Obtain mixed solution A;

[0034] (2) Add 15 g of thermoplastic polyurethane elastomer and 8 g of 1-4-butanediol to the mixed solution A, and react at 80° C. for 2 hours to obtain the mixed solution B of the polymerization reaction;

[0035] (3) Add a neutralizing agent to the mixed solution B to form a salt, here select ammonia water, adjust the pH to 7.5, add 5 g of deionized water, 1 g of hydrazine hydrate, and stir to disperse and emulsify at a stirring speed of 2000 r / min for 3 min, Then react at 20°C for 30 minutes to obtain a mixture C;

[0036] (4) Stir the mixed solution C at 20°C with a stirring speed of 2400r / min for 40min, and let it stand fo...

Embodiment 2

[0038] A kind of water-based polyurethane is prepared through the following steps:

[0039](1) Heat 40 g of diethylaminoethanol to 110° C. in a vacuum environment for dehydration treatment for 2 hours (dehydration treatment is a conventional technical means in this field), then add 35 g of isocyanic acid, and react for 2 hours at 80° C. to obtain Mixture A;

[0040] (2) Add 15 g of thermoplastic polyurethane elastomer and 8 g of 1-4-butanediol to mixed solution A, and react at 85° C. for 3 hours to obtain mixed solution B;

[0041] (3) Add a neutralizing agent to the mixed solution B to form a salt, select ammonia water here, adjust the pH to 8.5, add 5 g of deionized water, 1 g of hydrazine hydrate, and stir and emulsify at a stirring speed of 2000 r / min for 5 min, then in At 35°C, react for 40 minutes to obtain a mixture C;

[0042] (4) Stir the mixed solution C at 25° C. with a stirring speed of 4000 r / min for 50 minutes, and let it stand for 48 hours to obtain water-base...

Embodiment 3

[0044] A kind of water-based polyurethane is prepared through the following steps:

[0045] (1) Heat 40g of diethylaminoethanol to 110°C in a vacuum environment for dehydration treatment for 1.5h (dehydration treatment is a conventional technical means in this field), then add 35g of isocyanic acid, and react for 3h at 85°C, Obtain mixed solution A;

[0046] (2) Add 15 g of thermoplastic polyurethane elastomer and 8 g of 1-4-butanediol to mixed solution A, and react at 90°C for 4 hours to obtain mixed solution B;

[0047] (3) Add a neutralizing agent to the mixed solution B to form a salt, here select ammonia water, adjust the pH to 9, add 5g of deionized water, 1g of hydrazine hydrate, and stir and emulsify at a stirring speed of 2000r / min for 4min, then in At 50°C, react for 30 minutes to obtain a mixture C;

[0048] (4) Stir the mixed solution C at 25° C. with a stirring speed of 5000 r / min for 60 minutes, and let it stand for 48 hours to obtain water-based polyurethane. ...

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Abstract

The invention relates to the technical field of polymer materials, in particular to a waterborne polyurethane. The waterborne polyurethane is prepared polyaminoalcohol, isocyanic acid, a thermosplastic polyurethane elastomer, a chain extender, a neutralizer, deionized water and hydrazine hydrate, wherein polyaminoalcohol is diethylaminoethanol, 3-amino-1,2-propanediol or 3-lignocaine-1-propanol, and the use amount of the neutralizer reaches the standard that the pH of a mixed solution is controlled to be 7.5-9. The waterborne polyurethane has the advantages of good wear resistance and water resistance and good wettability. The invention further provides a waterborne polyurethane into which castor oil is added, and the wettability of the waterborne polyurethane is further improved. The invention further provides a matte waterborne polyurethane prepared after matting powder is added to the two waterborne polyurethanes, and preparing methods of the matte waterborne polyurethane and the two waterborne polyurethanes; in this way, the obtained matte waterborne polyurethane has the advantages that a matting agent cannot be stripped out of a coating film while the glossiness of the surfaceof leather is improved, and the effective acting time of the matting powder is prolonged.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a water-based polyurethane, matte water-based polyurethane and a preparation method. Background technique [0002] A large amount of leather is used in the fields of automobiles, luggage and shoes, and coatings are often used for surface finishing in order to improve the appearance, corrosion resistance and wear resistance of the leather surface. [0003] Polyurethane synthetic leather is the most promising natural leather substitute after PVC artificial leather. Polyurethane synthetic leather makes up for the shortcomings of PVC artificial leather and substrates such as poor bonding fastness, easy peeling, and stiff hand feeling. It has the advantages of natural and soft luster, good bonding performance, and wear resistance. [0004] Most of the existing low-gloss leather finishing agents use water-based polyurethane resin. Water-based polyurethane is a low-viscosity ...

Claims

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Application Information

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IPC IPC(8): C08G18/32C08G18/34C08G18/36C09D175/04C09D7/61C14C11/00
CPCC08G18/3206C08G18/3271C08G18/3275C08G18/348C08G18/36C09D175/04C14C11/006C09D7/61C08L75/04C08K3/36
Inventor 鲁明友
Owner 浙江诚迅新材料有限公司
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