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Solvent-free double-constituent polyurethane compound adhesive and preparation method for same

A two-component polyurethane and adhesive technology, applied in the field of polymer chemistry, can solve problems such as inability to coat, weaken composite fastness, and affect appearance, and achieve the effects of reducing production costs, increasing production speed, and extending the service life

Active Publication Date: 2013-04-03
苏州博莱特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the molecular weight of solvent-free adhesives is much smaller than that of solvent-based adhesives, and there are many factors such as poor wettability, when used to bond composite films containing metal foils such as aluminum foil, there will be problems with composite fastness after high-temperature sterilization. Significantly weakened, and the yellowing of the colloid affects the appearance and other problems, showing poor high temperature resistance and durability
In addition, the existing two-component polyurethane adhesive has the problem that the viscosity rises sharply after the two components are mixed, resulting in uneven coating or even failure to coat.
[0004] CN1989217B patent literature discloses a solvent-free polyurethane adhesive with excellent high temperature resistance and durability, but it is suitable for bonding metal foils such as aluminum and plastic films, and the range of composite substrates is narrow
CN101503611A patent document discloses a two-component solvent-free polyurethane adhesive, which exhibits low water absorption, low hydrolysis, and high impact resistance, but its composite fastness is not strong, and its composite material does not meet the requirements of high temperature resistance

Method used

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  • Solvent-free double-constituent polyurethane compound adhesive and preparation method for same
  • Solvent-free double-constituent polyurethane compound adhesive and preparation method for same
  • Solvent-free double-constituent polyurethane compound adhesive and preparation method for same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: the preparation of A-1

[0059] Under the protection of nitrogen, heat 65 parts of polyoxypropylene diol with a molecular weight of 400 and 60 parts of polyoxypropylene triol with a molecular weight of 300 to 130°C, under a vacuum of 0.266KPa, dehydrate for 1.5h and then take a sample to measure the moisture content. When the content is less than 0.05%, cool down to 70°C, add 150 parts of HMDI and 125 parts of IPDI, and react at 85°C for 2 hours to obtain component A (hereinafter referred to as A-1).

Embodiment 2

[0060] Embodiment 2: the preparation of A-2

[0061] Under the protection of nitrogen, 120 parts of polyoxypropylene triol with a molecular weight of 300 and 80 parts of a soybean oil-modified polyol with a molecular weight of 1000 (functionality 2.6) were heated to 150 ° C, and the vacuum degree was 0.266 KPa. After dehydration for 2 hours, samples were taken for water measurement. When the water content is less than 0.05%, cool down to 60°C, add 150 parts of HMDI and 50 parts of IPDI, and react at 120°C for 2.5 hours to obtain component A (hereinafter referred to as A-2).

Embodiment 3

[0062] Embodiment 3: the preparation of A-3

[0063] Under the protection of nitrogen, 60 parts of polyoxypropylene diol with a molecular weight of 400 and 40 parts of castor oil-modified trihydric alcohol with a molecular weight of 900 were heated to 140 ° C, and under a vacuum of 0.266 KPa, after dehydration for 2 hours, samples were taken to measure the moisture content. When the water content is less than 0.05%, cool down to 70°C, add 200 parts of HMDI and 100 parts of IPDI, and react at 90°C for 3 hours to obtain component A (hereinafter referred to as A-2).

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Abstract

The invention provides a solvent-free double-constituent polyurethane adhesive which is composed of a constituent A and a constituent B, wherein the constituent A is end isocyanate-group polyurethane prepolymer, and the constituent B is carboxyl-containing polyether polyol. The solvent-free polyurethane adhesive is strong in compounding fastness, long in service usage period and wide in suitable base material range; and moreover, the compound film prepared from the adhesive can still keep an excellent appearance and excellent adhesion property after high-temperature sterilization treatment.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, and in particular relates to a solvent-free two-component polyurethane adhesive and a preparation method thereof. technical background [0002] At present, most of the composite films used in food flexible packaging in my country are mainly bonded by solvent-based adhesives, and are laminated by dry lamination process. Due to the high energy consumption, large VOC emissions, and solvent residues in the lamination process, food safety is seriously threatened. Due to its high solid content, solvent-free polyurethane adhesives are safe to use and environmentally friendly, and will be an inevitable trend in the development of packaging lamination processes. [0003] Solvent-free composite adhesives, including two types of one-component polyurethane adhesives and two-component polyurethane adhesives. Since the molecular weight of solvent-free adhesives is much smaller than that of solvent-based adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/08C08G18/75C08G18/67C08G18/64C08G18/48C08G18/12C08G18/10
Inventor 钟文军徐大勇
Owner 苏州博莱特新材料有限公司
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