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Preparation method of redispersible waterborne polyurethane powder

A water-based polyurethane and redispersion technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of easy hydrolysis of polyurethane resins, achieve extended storage life, good flexibility, and improve adhesion The effect of intensity

Active Publication Date: 2020-04-21
福建华夏蓝新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to solve the problem that the polyurethane resin is easily hydrolyzed in the storage process

Method used

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  • Preparation method of redispersible waterborne polyurethane powder
  • Preparation method of redispersible waterborne polyurethane powder

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preparation example Construction

[0014] The invention provides a kind of preparation method of redispersible waterborne polyurethane powder, comprises the following steps:

[0015] Step 1, preparation of the soft core layer: after mixing 1-2 parts by weight of glycol, 64-90 parts by weight of polyether polyol, and 0-16 parts by weight of polyester polyol, add 8-12 parts by weight of Polyisocyanate, after the reaction, the isocyanate prepolymer of the soft core layer is obtained;

[0016] Step 2, after mixing the 1-methylimidazole of 82 parts by weight and the paraformaldehyde of 55-78 parts by weight, heat and react, add the solvent of 500 parts by weight after cooling, remove unreacted solid paraformaldehyde by filtration, then reduce Pressure distillation removes solvent, obtains 2-hydroxymethyl-1-methylimidazole;

[0017] After heating 2-hydroxymethyl-1-methylimidazole, feed 176-308 parts by weight of ethylene oxide, cool down after the reaction, and obtain the first viscous liquid;

[0018] Step 3, take...

Embodiment 1

[0038] A preparation method of redispersible water-based polyurethane powder, specifically comprising the following steps:

[0039] Step 1. After mixing 10g of ethylene glycol and 900g of polytetrahydrofuran glycol PTMEG-3000, add 80g of hexamethylene diisocyanate HDI, heat up to 76°C and react for 5 hours to obtain the isocyanate prepolymer of the soft core layer;

[0040] Step 2. Mix 82g of 1-methylimidazole and 78g of paraformaldehyde and heat to 140°C for reaction. After 6 hours of reaction, cool down, add 500g of acetone, filter to remove unreacted solid paraformaldehyde, and depressurize the clear liquid Solvent acetone was distilled off to obtain white solid 2-hydroxymethyl-1-methylimidazole;

[0041] After heating 2-hydroxymethyl-1-methylimidazole to 120°C, pour 176g of ethylene oxide into it, react for 0.5h and then cool down to 35°C to obtain the first colorless and transparent viscous liquid;

[0042] Step 3. Take 288g of the first viscous liquid obtained in step 2...

Embodiment 2

[0046] A preparation method of redispersible water-based polyurethane powder, specifically comprising the following steps:

[0047] Step 1. After mixing 5g of 1,6-hexanediol, 320g of PEG-2000 and 90g of PEA-2000, add 120g of HMDI, heat up to 82°C and react for 2 hours to obtain the isocyanate prepolymer of the soft core layer;

[0048] Step 2. Mix 82g of 1-methylimidazole and 70g of paraformaldehyde and heat to 160°C for reaction. After 3 hours of reaction, cool down, add 500g of acetone, filter to remove unreacted solid paraformaldehyde, and then reduce the clear liquid to Pressure distillation removes solvent acetone, obtains white solid 2-hydroxymethyl-1-methylimidazole;

[0049] After heating 2-hydroxymethyl-1-methylimidazole to 140°C, add 308g of ethylene oxide, react for 3 hours and then cool down to 40°C to obtain the first colorless and transparent viscous liquid;

[0050] Step 3. Take 420g of the first viscous liquid obtained in step 2, add 143g of thionyl chloride d...

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Abstract

The invention discloses a preparation method of redispersible waterborne polyurethane powder, belonging to the technical field of adhesives. The preparation method comprises the following steps: preparing an isocyanate prepolymer of a soft core layer by using dihydric alcohol, polyether polyol, polyester polyol, polyisocyanate and the like; preparing a hard shell layer polyurethane compound coatedwith the soft core layer from the soft core layer, dihydroxy diquaternary ammonium salt and the like; and preparing the redispersible waterborne polyurethane powder with a core-shell structure from the soft core layer isocyanate prepolymer and the hard shell layer polyurethane compound. The redispersible waterborne polyurethane powder prepared by the method has good dispersibility and fluidity; the hard shell layer is composed of a structure with high modulus, good cohesion is provided for an adhesive, bonding strength is improved, and the problem that the redispersible waterborne polyurethane powder is mutually bonded into blocks in the storage process is avoided; and the soft core layer is composed of a structure with low modulus, and provides good initial adhesion and flexibility for the adhesive.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a preparation method of redispersible water-based polyurethane powder. Background technique [0002] With the development of science and technology, water-based polyurethane adhesives have made great progress, replacing solvent-based polyurethane adhesives in many fields. Water-based polyurethane adhesives have extremely low solvent content, are environmentally friendly, easy to use, and have high bonding strength in the later stage. More and more people have begun to pay attention to and use water-based polyurethane adhesives. Although water-based polyurethane adhesives have been promoted in many fields due to their environmental protection, they still have obvious shortcomings compared with solvent-based polyurethane adhesives. Water-based polyurethane adhesives are mainly synthesized from polyisocyanates, polyether polyols, polyester polyols, water-based chain e...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/66C08G18/48C08G18/42C08G18/32C08G18/44C08G18/34C09J175/08C09J175/06
CPCC08G18/12C08G18/3206C08G18/4018C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4833C08G18/4854C08G18/6607C08G18/6618C08G18/6625C08G2170/80C09J175/06C09J175/08C08G18/3855C08G18/3234C08G18/348C08G18/3231C08G18/3814C08G18/3228C08G18/3842
Inventor 邱元进饶长贵陈国栋
Owner 福建华夏蓝新材料科技有限公司