Low viscosity solvent-free polyurethane laminating adhesive and preparation method thereof

A polyurethane laminating adhesive, solvent-free technology, applied in the field of laminating adhesive, can solve the problems of low initial viscosity and poor adhesion, and achieve the effects of high peel strength, improved initial adhesive force and improved hydrophobicity

Active Publication Date: 2013-07-24
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with solvent-based adhesives that obtain better initial tack after the solvent evaporates, the initial tack of solvent-free adhesives is usually not high, especially the adhesion to plastic films and metal foils on which evaporated metals are poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of A-1

[0033] Raw materials and proportioning: polytetrahydrofuran diol (molecular weight 1000) 60g, refined castor oil polyol (hydroxyl value 162mgKOH / g) 100g, isophorone diisocyanate 150g;

[0034] Process: Put polytetrahydrofuran diol and refined castor oil polyol into the reactor, heat up to 105°C and vacuum dry for 1 hour until the water content of the polyol is less than 0.05%, then cool down to 50°C, add isophorone di Isocyanate and increase the stirring speed to make it fully mixed with polyol, and at the same time pass through industrial nitrogen protection, and then raise the temperature to 70°C for 2 hours to react to obtain component A of isocyanate-terminated polyurethane prepolymer;

[0035]Properties of component A: It is a clear, transparent viscous liquid at room temperature, and its viscosity is 900cP at 50°C.

Embodiment 2

[0037] Preparation of A-2

[0038] Raw materials and proportioning: Polyoxypropylene diol (molecular weight 400) 50g, poly(1,4-butylene adipate) (molecular weight 1000) 50g, refined castor oil polyol (hydroxyl value 162mgKOH / g) 100g, isofor Alone diisocyanate 200g;

[0039] Process: Put polyoxypropylene diol, poly(1,4-butylene adipate) and refined castor oil polyol into a reactor, heat up to 120°C and vacuum dry for 3 hours until the water content of the polyol is less than 0.05 %, then lower the temperature to 60°C, add isophorone diisocyanate and increase the stirring speed to fully mix with the polyol, and at the same time pass through industrial nitrogen protection, and then raise the temperature to 90°C for 4 hours to obtain isocyanate-terminated polyurethane Prepolymer A component;

[0040] Properties of component A: It is a clear, transparent viscous liquid at room temperature, and its viscosity is 600cP at 50°C.

Embodiment 3

[0041] The preparation of embodiment 3 A-3

[0042] Raw materials and proportioning: Polyoxypropylene diol (molecular weight 1000) 100g, poly(1,4-butylene adipate) (molecular weight 1000) 50g, refined castor oil polyol (hydroxyl value 130mgKOH / g) 100g, isofor Alone diisocyanate 200g;

[0043] Process: Put polyoxypropylene glycol, poly(1,4-butylene adipate) and soybean oil polyol into the reactor, heat up to 120°C and vacuum dry for 2 hours until the water content of the polyol is less than 0.05% , then lower the temperature to 60°C, add isophorone diisocyanate and increase the stirring speed to fully mix it with the polyol, and at the same time pass through industrial nitrogen protection, then raise the temperature to 80°C and react for 2 to 4 hours to obtain the terminal isocyanate group Polyurethane prepolymer A component;

[0044] Properties of component A: It is a clear, transparent viscous liquid at room temperature, and its viscosity is 1500cP at 50°C.

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PUM

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Abstract

The invention discloses a low viscosity solvent-free polyurethane laminating adhesive, which includes component A and component B. The component A is an isocyanate terminated compound, and the component B is a hydroxyl terminated compound. The component A and the component B are mixed according to that the isocyanate terminated group and the hydroxyl are in a mole ratio of 1.3-1.75, thus obtaining the bicomponent polyurethane laminating adhesive. The invention also discloses a preparation method of the low viscosity solvent-free polyurethane laminating adhesive. The low viscosity solvent-free polyurethane laminating adhesive prepared by the invention has the advantages of low viscosity, fast curing speed, high peel strength and resistance to 100DEG C cooking.

Description

technical field [0001] The invention relates to a laminating adhesive suitable for the field of composite flexible packaging, in particular to a low-viscosity solvent-free polyurethane laminating adhesive and a preparation method thereof. Background technique [0002] Solvent-free polyurethane adhesives do not have the problem of solvent volatilization, are environmentally friendly adhesives, and are also one of the new directions for the development of adhesives. As people pay more and more attention to the hygiene and safety of packaging materials and environmental protection, the green and environmentally friendly solvent-free laminating adhesive, as a substitute for solvent-based laminating adhesive, is gradually becoming the new favorite in the field of composite flexible packaging. Solvent-free polyurethane laminating adhesive has the following major advantages: there is no solvent emission problem, and there is no solvent residue problem; there is no need for complica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C09J7/00C08G18/12C08G18/67C08G18/48C08G18/42
Inventor 陈广学郑灿炜王青陈奇峰陈双莲
Owner SOUTH CHINA UNIV OF TECH
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