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Yellowing-resistant water-based polyurethane emulsion and preparation method thereof

A water-based polyurethane and anti-yellowing technology, applied in the field of organic polymer materials, can solve the problems of poor appearance of emulsion, uneven distribution of soft and hard segments, poor block uniformity, etc., and achieve good quality stability and distribution of soft and hard segments Uniform, block uniform effect

Inactive Publication Date: 2018-05-15
HUIZHOU DAYAWAN DAZHI FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to propose a yellowing-resistant water-based polyurethane emulsion product with poor block uniformity, uneven distribution of soft and hard segments, and poor emulsion appearance. The preparation method of water-based polyurethane emulsion, the obtained water-based polyurethane emulsion product has good block uniformity, uniform distribution of soft and hard segments and good emulsion appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 120 parts of poly(propylene carbonate diol) with a molecular weight of 1000, a hydroxyl functionality of 2 and a carboxyl functionality of 1 with a carboxyl group in the side chain. After dehydration at a temperature of 110° C. and a vacuum pressure of -0.08 MPa, add 53 Parts of isophorone diisocyanate, and 0.24 parts of stannous octoate catalyst, reacted at 85°C for 4 hours, added 10 parts of acetone to reduce the viscosity, lowered to 40°C, added 12 parts of triethylamine for neutralization for 10 minutes, added 435 parts Deionized water, emulsification at 5°C for 15 minutes, adding 1.2 parts of ethylenediamine and chain extension for 30 minutes, removing acetone under reduced pressure to obtain a water-based polyurethane emulsion resistant to yellowing.

Embodiment 2

[0027] Take 120 parts of poly(propylene carbonate diol) with a molecular weight of 1000, a hydroxyl functionality of 2 and a carboxyl functionality of 1 with a carboxyl group in the side chain. After dehydration at a temperature of 120°C and a vacuum pressure of -0.09MPa, add 40 Parts of isophorone diisocyanate, 10 parts of hexamethylene diisocyanate, and 0.24 parts of stannous octoate catalyst, reacted at 85°C for 4 hours, added 15 parts of acetone to reduce viscosity, lowered to 40°C, added 12 parts of triethyl After neutralizing the amine for 10 minutes, add 427 parts of deionized water, emulsify at 5°C for 15 minutes, add 1.2 parts of ethylenediamine and extend the chain for 30 minutes, and remove acetone under reduced pressure to obtain a water-based polyurethane emulsion that is resistant to yellowing.

Embodiment 3

[0029] Take 120 parts of poly(propylene carbonate diol) with a molecular weight of 1000, a hydroxyl functionality of 2 and a carboxyl functionality of 1 with carboxyl groups in the side chain. After dehydration at a temperature of 130° C. and a vacuum pressure of -0.095 MPa, add 63 Parts of hydrogenated diphenylmethane diisocyanate, and 0.36 parts of stannous octoate catalyst, reacted at 85°C for 5 hours, added 20 parts of acetone to reduce the viscosity, lowered to 40°C, added 12 parts of triethylamine for neutralization for 10 minutes, added 460 Parts of deionized water, emulsified at 5°C for 15 minutes, added 1.2 parts of ethylenediamine and chain extended for 30 minutes, and removed acetone under reduced pressure to obtain a water-based polyurethane emulsion resistant to yellowing.

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Abstract

The invention discloses an yellowing-resistant water-based polyurethane emulsion and a preparation method thereof. The yellowing-resistant water-based polyurethane emulsion comprises the following components in parts by mass: 115-125 parts of polypropylene carbonate polyol containing carboxyl in side chain, 18-63 parts of aliphatic diisocyanate, 0.06-0.36 part of a catalyst, 12 parts of a neutralizing agent, 5-20 parts of acetone, 332-460 parts of deionized water, and 0.6-1.2 parts of a chain extender. The preparation method is characterized in that the yellowing-resistant water-based polyurethane emulsion is prepared by adding the chain expander to polypropylene carbonate polyol containing carboxyl in side chain and aliphatic diisocyanate in the presence of the catalyst. With the adoptionof the method, the prepared yellowing-resistant water-based polyurethane emulsion is uniform in blocks, uniform in distribution of soft and hard sections, stable in quality, and free from yellowing in case of long-term storing; the improved preparation method is safe and environmentally friendly; the adopted raw materials are environmentally friendly, and low in cost; the preparation processes are simple; and the actual application value is high.

Description

technical field [0001] The invention relates to the technical field of organic polymer materials, in particular to a yellowing-resistant water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Waterborne polyurethane is a new material, which is widely used in coatings, adhesives, fabric coating and finishing agents, leather finishing agents, paper surface treatment agents and fiber surface treatment agents. Traditional solvent-based polyurethane needs to use a large amount of organic solvents in the synthesis process, such as toluene, benzene, chlorinated alkanes, etc., and produces a large amount of volatile organic compounds in the process of production and application. Cause pollution, but also endanger human health to a large extent. With the continuous improvement of laws and regulations and the awareness of environmental protection, safety, and low carbon being deeply rooted in the hearts of the people, water-based polyurethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/32C08G18/44C08G18/75
CPCC08G18/3228C08G18/44C08G18/6651C08G18/755
Inventor 陈伟彬牛艳丽麻乐蔡志华刘保华
Owner HUIZHOU DAYAWAN DAZHI FINE CHEM
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