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Aqueous composite adhesive and preparation method and use thereof

A composite adhesive and adhesive technology, applied in the direction of adhesives, grafted polymer adhesives, adhesive types, etc., can solve the problems of high cost and uncompetitive water-based adhesives, and achieve improved water resistance and high composite strength , a wide range of effects

Inactive Publication Date: 2010-07-07
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Patent CN200610036231.3 introduces a water-based adhesive for flexible packaging, in which two raw materials, acetoacetate ethyl methacrylate (AAEM) and hydrazine, are used for cross-linking after film formation through ketone carbonyl and hydrazine, but the water-based The adhesive is only used for the compounding of PE film, and the cost of these two raw materials is relatively high, making the water-based adhesive not very competitive

Method used

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  • Aqueous composite adhesive and preparation method and use thereof
  • Aqueous composite adhesive and preparation method and use thereof

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Embodiment 1

[0035] Embodiments of the present invention provide a water-based composite adhesive that is economical, affordable, and excellent in performance. The adhesive is a polyurethane / acrylate (PUA) composite emulsion formed by chemically copolymerizing polyurethane and polyacrylate, and its solid content is 30-50%, wherein polyurethane accounts for 5-20% of the total weight of the composite emulsion, polyacrylate accounts for 25-45% of the total weight of the composite emulsion, and water accounts for 50-70% of the total weight of the composite emulsion.

[0036] The preparation method of this aqueous composite adhesive comprises the following steps:

[0037] a. Preparation of water-based polyurethane PU emulsion: dehydrate the macromolecular diol at 110°C and vacuum 0.02MPa for 1 hour, then lower it to room temperature, add diisocyanate and a small amount of organotin catalyst and react at 60-80°C for 2-4 hours , then lower the temperature to 60°C and add a small molecule chain ex...

Embodiment 2

[0057] This embodiment provides a method for preparing a water-based composite adhesive. The prepared adhesive can be used to prepare composite film flexible packaging. The method specifically includes the following steps:

[0058] a. Preparation of water-based PU emulsion: get 180g polyether diol (Mn=2000), dehydrate at 110°C and vacuum 0.02MPa for 1h, then drop to room temperature, add 68g TDI and 0.02g dibutyltin dilaurate catalyst, React at 60-80°C for 2-4h, then cool down to 60°C, add 6g BDO and 16gDMPA, continue to react for 3-6h to obtain PU prepolymer, add 100g of ethyl acrylate and butyl acrylate mixture (EA:BA =3:1, weight ratio) as a solvent to dilute the prepared PU prepolymer, then add 25g hydroxyethyl acrylate, continue the reaction for 2-4h, then drop to room temperature and add 11g triethylamine (TEA) to neutralize, Add deionized water to disperse under high shear force to obtain water-based polyurethane emulsion;

[0059] b. Preparation of water-based PUA emu...

Embodiment 3

[0062] The present embodiment provides a kind of preparation method of water-based composite adhesive, and this method specifically comprises the following steps:

[0063] a. Preparation of water-based PU emulsion: Take 160g of polyether diol (Mn=2000) and 40g of polyester diol (Mn=2000), dehydrate at 110°C for 1h under a vacuum of 0.02MPa, then cool down to room temperature, add 86g of TDI React with 0.03g dibutyltin dilaurate catalyst at 60-80°C for 2-4h, then cool down to 60°C, add 7gBDO and 19gDMPA, continue to react for 3-6h to obtain PU prepolymer, add 100g methyl acrylate And the mixture of butyl acrylate (MA: BA=1: 1, weight ratio) is used as solvent to dilute prepolymer, then add 30g hydroxypropyl acrylate, continue to react for 2~4h, drop to room temperature and add 12g triethylamine ( TEA) neutralization, adding deionized water to disperse water-based polyurethane emulsion under the action of high shear force;

[0064]b. Preparation of water-based PUA emulsion: Add...

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Abstract

The invention discloses an aqueous composite adhesive and a preparation method thereof, and belongs to the field of high molecular materials. The adhesive is polyurethane / acrylate PUA composite emulsion, wherein based on the total weight of the PUA composite emulsion, the content of the polyurethane is 5 to 20 percent; the content of the polyacrylate is 25 to 45 percent; the content of water is 50 to 70 percent; and the solid content of the PUA composite emulsion is 30 to 50 percent. The preparation method comprises the following steps: preparing the aqueous polyurethane emulsion; preparing the aqueous polyurethane / acrylate PUA composite emulsion from the aqueous polyurethane emulsion; and finally, regulating the solid content of the aqueous polyurethane / acrylate PUA composite emulsion by using de-ionized water, and adding an antifoaming agent, a wetting agent and an antiseptic to prepare the aqueous composite adhesive. In the prepared aqueous PUA composite emulsion, emulsion particles have complex phase structures, a carbamic acid ester chain is knitted tightly with an acrylicacid chain at the molecular level, and the synergic effect between the two makes the performance of a coating better than that of a physically blended coating, so that the aqueous PUA composite emulsion has high performance and environmental protection property.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high-performance water-based composite adhesive and its preparation method and application. Background technique [0002] In recent years, in the field of packaging, composite flexible packaging has developed rapidly due to its light weight, low price, bright colors, changeable shape and other good practical properties and excellent barrier properties, and has gradually replaced rigid packaging materials, greatly facilitating people's basic necessities of life. and improve people's quality of life. Composite film flexible packaging also belongs to composite flexible packaging. It has the characteristics of shielding, printability and heat sealing. It is widely used in the packaging of food, medicine, cosmetics and office consumer goods, and can partially replace packaging materials such as glass, tinplate, paper and cardboard. . With the development of food and pharmaceutical...

Claims

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Application Information

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IPC IPC(8): C09J151/08
Inventor 陈小锋沈峰
Owner BEIJING COMENS NEW MATERIALS
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