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Preparation method for polyurethane adhesive for binding high-grade books

A technology of polyurethane adhesives and books, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of high rigidity, poor flexibility, and high glass transition temperature, and achieve convenient operation and flexibility Good, simple production process

Inactive Publication Date: 2012-10-03
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high glass transition temperature, high rigidity and poor flexibility, it is not suitable for the field of book binding

Method used

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  • Preparation method for polyurethane adhesive for binding high-grade books

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Under the reaction conditions of the comparative example, 100 g of trihydroxypolyoxypropylene ether was added to component A, and a light yellow, fluid, and almost transparent viscous liquid was obtained; trihydroxypolyoxypropylene ether in component B And the amount of glycerol becomes 105g and 17g respectively, obtains transparent, pale yellow viscous liquid, and A, B two components are mixed and stirred according to R=1.1.

Embodiment 2

[0031]Under the reaction conditions of the control example, replace the toluene diisocyanate (TDI) in the component A with 10g 4,4'-diphenylmethane diisocyanate (MDI), and the light yellow, fluidity, and transparent viscous Thick liquid, and mix A and B according to R=1.2.

Embodiment 3

[0033] Under the reaction conditions of the comparative example, the hydroxyl monomer in component A was converted into 160g castor oil, 20g polyethylene adipate, and the isocyanate monomer was converted into 10g isophorone diisocyanate (IPDI), to obtain Light yellow, high viscosity, transparent viscous liquid; the hydroxyl monomer in component B is converted into 45g castor oil and 5g glycerol to obtain a light yellow transparent, relatively viscous liquid, and the two groups of A and B Parts are mixed according to R=1.4.

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Abstract

The invention discloses a preparation method for a polyurethane adhesive for binding high-grade books and belongs to the field of polyurethane adhesive compounding. The steps are as follows: (1) prepolymerization reaction: using hydroxy monomers and isocyanate monomers as main raw materials, and compounding to get prepolymers blocked with OH and NCO respectively; and (2) cross-linking reaction: mixing the two kinds of prepolymers by a certain proportion, and curing to obtain a transparent or semitransparent, flexible and properly hard coating. The invention adopts the two-step compounding method of prepolymerization and cross-linking to compound out a solvent-free double-component polyurethane adhesive; the production process is simple and clean and conforms to the requirement of environmental protection; and the viscosity and the molecular weight of Components A and B can be adjusted through prepolymerization so as to increase bonding strength; the adhesive can be cured in the cross-linking process so as to further improve the bonding strength. (3) The components A and B are liquid at normal temperature, and the viscosity and the curing speed are adjustable; the curing reaction is conducted at room temperature, the operation is convenient, the energy consumption is low, and product storage is stable.

Description

technical field [0001] The invention belongs to the field of synthesizing polyurethane adhesives, in particular to a method for preparing high-grade polyurethane adhesives for bookbinding. Background technique [0002] In recent years, people's requirements for the quality of book binding have been increasing day by day, mainly in the relatively backward field of post-press binding. There are three main methods of book binding: wire binding, nail binding and glue binding, among which glue binding is the most commonly used method, and adhesive is an important supporting material for glue binding. There are many kinds of adhesives for book binding, mainly starch paste glue (starch paste, dextrin), animal glue (bone glue), polyvinyl acetate (PVAC) emulsion adhesive, polyethylene vinyl acetate (EVA) hot melt Adhesive, moisture-curing reactive polyurethane (PUR) hot melt adhesive, etc. [0003] Starch glue has strong adhesive force, but it is easy to absorb moisture and delique...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J175/08C09J175/14C09J175/06C08G18/67C08G18/66C08G18/48C08G18/42C08G18/32C08G18/10C08G18/12
Inventor 杜郢蔡小燕任筱芳阮殿甲
Owner CHANGZHOU UNIV
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