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Polyurethane hot melt adhesive for bookbinding of books and magazines and preparation method thereof

A technology for polyurethane hot-melt adhesives and books and periodicals, applied in the field of polyurethane hot-melt adhesives and reactive polyurethane hot-melt adhesives, can solve problems such as breakage, adhesive layer fracture, and page peeling, and achieves not easy to drop pages, excellent high and low temperature resistance, Excellent pulling effect

Active Publication Date: 2013-04-03
WUXI WANLI ADHESION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the diversification of printing products, the printing industry has begun to use various printing papers, plastic films, varnishes and inks of different grammes. Traditional EVA hot melt adhesives tend to break the adhesive layer when bonding these materials. Problems such as off-page and breakage

Method used

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  • Polyurethane hot melt adhesive for bookbinding of books and magazines and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation method of the polyurethane hot melt adhesive for bookbinding is as follows in parts by weight: 80 parts of polyester polyol and 1 part of additive are placed in a reaction kettle, heated to 120°C, and vacuum dehydrated for 1.5 hours under stirring , then lower the temperature to 80°C; take 5 parts of hexamethylene diisocyanate and 10 parts of diphenylmethane diisocyanate, preheat to 60°C, add to the reaction kettle, stir at 75°C, and carry out prepolymerization at a vacuum of -0.095MPa for 20min; After the polymerization is completed, add 2 parts of chain extender BDO and 2 parts of TMP to carry out the chain extension reaction in a vacuum at 85 ° C. After the chain extension reaction is completed for 30 to 45 minutes, the reaction is completed, and the product is poured out under the condition of nitrogen protection, sealed and packaged to obtain Polyurethane hot melt adhesive for bookbinding.

Embodiment 2

[0016] The preparation method of the polyurethane hot-melt adhesive for bookbinding is as follows in parts by weight: 77 parts of polyester polyol and 1 part of additives are placed in a reaction kettle, heated to 120°C, and vacuum dehydrated for 2 hours under stirring , then lower the temperature to 80°C; take 6 parts of hexamethylene diisocyanate and 9 parts of diphenylmethane diisocyanate, preheat to 60°C, add to the reaction kettle, stir at 80°C, and carry out prepolymerization under vacuum at 0.01MPa for 25min; prepolymerization After the completion, add 2-4 parts of chain extender BDO and 2-4 parts of TMP to carry out the chain extension reaction at 75-85 ° C. After the chain extension reaction is completed for 30-45 minutes, the reaction is completed, and the product is poured out under the condition of nitrogen protection. Seal the package to obtain the product bookbinding polyurethane hot melt adhesive.

Embodiment 3

[0018] The preparation method of the polyurethane hot melt adhesive for bookbinding is as follows in parts by weight: 67 parts of polyester polyol and 2 parts of additives are placed in a reaction kettle, heated to 120°C, and vacuum dehydrated for 1.5 hours under stirring , and then lower the temperature to 80°C; take 10 parts of hexamethylene diisocyanate and 14 parts of diphenylmethane diisocyanate, preheat to 60°C, add to the reaction kettle, stir at 75-85°C, and carry out prepolymerization reaction for 30min at a vacuum of 0.02MPa; After the prepolymerization is completed, add 4 parts of chain extender BDO and 3 parts of TMP to carry out the chain extension reaction at 80°C. After the chain extension reaction is completed for 35 minutes, the reaction is completed, and the product is poured out under the condition of nitrogen protection, sealed and packaged to obtain the product Polyurethane hot melt adhesive for book binding.

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Abstract

The invention relates to a polyurethane hot melt adhesive for bookbinding of books and magazines and a preparation method thereof, belonging to the technical field of preparation of polyurethane. Polyester polylol and additives are placed in a reaction kettle for heating, vacuum dehydration is performed under stirring, and then cooling is performed; hexamethylene diisocyanate and methylenediphenyl diisocyanate are taken, preheated and then added into the reaction kettle, and the pre-polymerization is performed under vacuum stirring; after completing the pre-polymerization, a chain extender isadded for performing chain extension reaction, a product is poured out under the condition of introducing nitrogen for protection, sealing and packaging are performed, and then the product, namely the polyurethane hot melt adhesive for bookbinding of the books and the magazines is obtained. The obtained hot melt adhesive has high bonding strength, the using quantity is small, and the hot melt adhesive further has excellent environment friendliness, solvent resistance, high and low-temperature resistance and excellent printing ink erosion resistance, and can meet the bonding requirements of different paper sheets. The technical process is the method which is well acquainted by technical staff in the field, and has great economic benefits and industrialized production prospects.

Description

technical field [0001] The invention relates to a polyurethane hot-melt adhesive, in particular to a reactive polyurethane hot-melt adhesive used in a bookbinding linkage line, and belongs to the technical field of polyurethane preparation. Background technique [0002] At present, the binding of most domestic books and periodicals adopts perfect binding, and the adhesive usually selected is mainly ethylene / vinyl acetate (EVA) hot melt adhesive. EVA hot-melt adhesive is economical and practical, and can meet the binding requirements of most books with low bonding strength, thin books and single types of paper. With the diversification of printing products, the printing industry has begun to use various printing papers, plastic films, varnishes and inks of different grammes. Traditional EVA hot melt adhesives tend to break the adhesive layer when bonding these materials. Problems such as page-off and breakage occur. The polyurethane hot melt adhesive can completely solve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J175/08C09J11/04C08G18/66
Inventor 林长灿刘小丽
Owner WUXI WANLI ADHESION MATERIALS
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