Acrylic acid modified water-based polyurethane adhesive and preparation method thereof

A water-based polyurethane and butyl acrylate technology, which is applied in the direction of graft polymer adhesives, adhesive types, adhesives, etc., can solve the problems that the performance advantages of polyurethane and acrylate cannot be fully utilized, low viscosity, low solid content, etc. , to achieve the effects of good room temperature curing performance, wide application prospects, and simple production process

Inactive Publication Date: 2013-08-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One-component water-based polyurethane has the disadvantages of low solid content and low viscosity, resulting in slow drying and film formation, poor coating performance and difficult construction. At the same time, the reduction of solid content will lead to an increase in transportation costs.
Chinese patent CN101456942A discloses a one-component water-based polyurethane modified by diethylenetriamine cross-linking with a chain extender such as adipic dihydrazide, which increases the solid content, but the viscosity is only 13-19 seconds. Causes difficulty in construction, poor coatability and low initial tack
Chinese patent CN101993677 discloses a water-based polyurethane with butanediol chain extension, but its viscosity is low, it needs to be adjusted by adding a thickener, the operation is troublesome and complicated, and the addition of ammonia water is easy to bring volatile odor
Chinese patent CN102786651A uses a two-step method to prepare acrylic polyurethane blends. The process is complicated, and no bridging agent is used. Waterborne polyurethane and acrylate are simply blended. The compatibility of the two phases is poor, and the respective properties of polyurethane and acrylate cannot be fully utilized. Performance advantages and very low viscosity
Chinese patent CN102167798A discloses a two-component waterborne polyurethane, but the dispersion uses up to 58% deionized water, the solid content of the system is low, and a large amount of acetone is used as the curing agent
U.S. Patent US6235384 uses aziridine as an external linking agent, but the reaction will start immediately when the two components are mixed, resulting in a short pot life and affecting construction
U.S. Patent WO9145475A1 discloses a two-component system using HDI trimer as a curing agent, but its dispersion has not been compounded and modified, and the curing agent has not been sealed, and the pot life is not long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 25 parts of diethylene glycol adipate with a molecular weight of 2000 were passed through N at 120°C 2 Remove water. Add 11 parts of isophorone diisocyanate, 2‰ parts by mass of dibutyltin dilaurate and react at 85°C for 2 hours, then add 9 parts by mass of dimethylol propionic acid and react for 2 hours to obtain a prepolymer. Add 20 parts of acetone according to the viscosity in the reaction.

[0035] Cool down to below 75°C and add 25 parts of butyl acrylate, then add 2.7 parts of triethylamine for neutralization for 1 hour. Add 8 parts of hydroxyethyl methacrylate and 8 parts of methyl methacrylate, and add 100 parts of deionized water for emulsification. 1% by mass of azobisisobutyronitrile was added and reacted at 70° C. for 2 hours. After vacuum distillation, the product can be obtained, and its properties are as follows: solid content 42%, 25°C -4 cup viscosity 180 seconds.

Embodiment 2

[0037] 12 parts of diethylene glycol adipate with a molecular weight of 900 were passed through N at 100°C 2Remove water. Add 11 parts of isophorone diisocyanate, 2‰ mass parts of dibutyltin dilaurate and react at 85°C for 2 hours, then add 9% mass parts of dimethylol propionic acid and react for 2 hours to obtain a prepolymer. 15 parts of nitrogen-methylpyrrolidone were added to the reaction.

[0038] Cool down to below 75°C and add 20 parts of butyl acrylate, then add 2.8 parts of triethylamine for neutralization for 1 hour. Add 9 parts of hydroxyethyl methacrylate and 13 parts of methyl methacrylate, and add 100 parts of deionized water for emulsification. 1% by mass of azobisisobutyronitrile was added and reacted at 70° C. for 2 hours. After vacuum distillation, the product can be obtained, and its properties are as follows: solid content 45.9%, 25°C -4 cup viscosity 41 seconds.

Embodiment 3

[0040] 25 parts of neopentyl glycol adipate with a molecular weight of 1000 were passed through N at 120°C 2 Remove water. Add 11 parts of isophorone diisocyanate, 2‰ parts by mass of dibutyltin dilaurate and react at 85°C for 2 hours, then add 9 parts by mass of dimethylol propionic acid and react for 2 hours to obtain a prepolymer. Add 20 parts of acetone according to the viscosity in the reaction.

[0041] Cool down to below 75°C and add 27 parts of butyl acrylate, then add 2.8 parts of triethylamine for neutralization for 1 hour. Add 8 parts of hydroxyethyl methacrylate and 6 parts of methyl methacrylate, and add 100 parts of deionized water for emulsification. 1% by mass of azobisisobutyronitrile was added and reacted at 70° C. for 2 hours. After vacuum distillation, the product can be obtained, and its properties are as follows: 25 ° C - 4 cup viscosity 146 seconds.

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Abstract

The invention belongs to the technical field of chemical adhesives and in particular relates to an acrylic acid modified water-based polyurethane adhesive and a preparation method thereof. The preparation method of the acrylic acid modified water-based polyurethane adhesive comprises the following steps of: preparing prepolymer; neutralizing and dispersing; and adding a bridging agent and an acrylic acid monomer for performing polymerization. The acrylic acid modified water-based polyurethane adhesive and a water-based curing agent are mixed to prepare a double-component water-based polyurethane adhesive. The double-component water-based polyurethane adhesive has the properties of low solvent consumption, high solid content, high viscosity, long and adjustable pot life of mixtures, excellent adhesive force, low price and the like, can be applied to base materials such as fabrics, foam, plastic, leather and the like, and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical adhesives, and in particular relates to an acrylic modified water-based polyurethane adhesive and a preparation method thereof. Background technique [0002] Water-based polyurethane adhesive is a kind of adhesive that uses water as the dispersion medium. It combines the advantages of high cohesion, wear resistance, solvent resistance, and tailorability of polyurethane with the advantages of low VOC content of water-based materials. , can effectively overcome the shortcomings of solvent-based polyurethane adhesives such as flammability, strong odor, toxicity, and difficulty in storage and storage. At the same time, through modification, water-based polyurethane can be endowed with mechanical properties comparable to solvent-based. [0003] With more and more countries promulgating laws and regulations to limit the use of volatile organic compounds in coatings and adhesives, and people paying more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/08C08F283/00C08F220/14C08F220/28C08G18/66C08G18/42C08G18/32
Inventor 倪秀元施信贵胡必成
Owner FUDAN UNIV
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