Preparation method of acrylic ester oligomer modified aqueous polyurethane pressure-sensitive adhesive

An acrylate-based, water-based polyurethane technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of poor emulsion stability, low monomer conversion rate, and large residual monomer odor. Emulsion stability, high monomer conversion rate, good product stability

Active Publication Date: 2011-04-20
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis needs to be carried out in two steps; and an emulsifier needs to be added, the monomer conversion rate in the emulsion copolymerization is low, the residual monomer smell is large, and the emulsion stability is poor

Method used

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  • Preparation method of acrylic ester oligomer modified aqueous polyurethane pressure-sensitive adhesive
  • Preparation method of acrylic ester oligomer modified aqueous polyurethane pressure-sensitive adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Under the operating conditions of the comparative example, with 0.3g acrylate oligomer (R f = H, R i : n = 4, R g = H, R j : n = 2; the number average molecular weight is about 65000) to replace part of TMP, the reaction time is 1~2h, the polyurethane prepolymer is chemically modified during the prepolymerization process, and the rest of the conditions are the same as the comparative example, and finally the transparent with blue light is obtained The emulsion (theoretical solid content is 30.44%).

Embodiment 2

[0035] Example 2: Under the operating conditions of the comparative example, with 0.5g acrylate oligomer (R f = H, R i : n = 4, R g = H, R j : n = 2; the number average molecular weight is about 45000) to replace part of TMP, the reaction time is 1~2h, and the other conditions are the same as the comparative example, and finally a white translucent emulsion with blue light is obtained (theoretical solid content is 30.83%).

Embodiment 3

[0036] Example 3: Under the operating conditions of the comparative example, adjust the amount of N210 to 7.0g, adjust the amount of 330N to 11.43g, and replace IPDI with 6.0gTDI, react for 1~3h, and get the prepolymer when the NCO value in the system basically reaches the theoretical value (the same as the R value in the comparative example), with 1.0g acrylate oligomer (R f = H, R i : n = 0, R g = CH 3 , R j : n = 2; the number average molecular weight is about 40000) to replace part of TMP, the reaction time is 1~2h, and the other conditions are the same as the comparative example, and finally an opaque yellowish emulsion (theoretical solid content is 31.56%) is obtained.

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Abstract

The invention relates to the technical field of preparation of aqueous adhesive and discloses a preparation method of acrylic ester oligomer chemical modified aqueous polyurethane pressure-sensitive adhesive. The preparation method comprises the following steps of: making hydroxyl monomers, a hydrophilic chain extender and polyisocyanate which are mainly used as man raw materials react to generate a prepolymer; adding an acrylic ester oligomer and making the acrylic ester oligomer and polyurethane prepolymer properly grafted; carrying out multiple modification through a cross-linking agent; and finally, carrying out water emulsification to obtain the acrylic ester oligomer modified aqueous polyurethane pressure-sensitive adhesive. In the invention, the acrylic ester oligomer is introducedinto the polyurethane system, and good characteristics of aqueous polyurethane and polyacrylic ester are integrated. Compared with solvent-based pressure-sensitive adhesive, water is used as a solvent in the invention, the usage amount of organic solvents is small so that the requirement of clean production processes are met, and the low temperature resistance is greatly improved. The synthesizedacrylic ester oligomer chemical modified aqueous polyurethane pressure-sensitive adhesive has more excellent mechanical property, strong bonding capacity, good film forming property and stable emulsion.

Description

technical field [0001] The invention relates to the technical field of preparation of water-based adhesives, in particular to a preparation method of an acrylate oligomer modified water-based polyurethane pressure sensitive agent. Background technique [0002] Water-based polyurethane adhesive is an important category of water-based adhesives. It has all the excellent properties of polyurethane materials: extensive adhesion, outstanding oil resistance, impact resistance, wear resistance, low temperature resistance and high elasticity, while reducing the organic solvent. Use, less pollution. However, water-based polyurethane has poor wettability to non-absorbent or non-polar substrates (such as polyester film, plastic, etc.), low adhesive strength, poor initial adhesion and water resistance. In order to make up for this defect, the research work on the modification of waterborne polyurethane has not stopped. Acrylic adhesives have good adhesion to non-polar substrates, exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/62C08G18/12
Inventor 杜郢周春利高晓欣魏科年王岚
Owner 溧阳常大技术转移中心有限公司
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