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
CN102703016AInactive Publication Date: 2012-10-03CHANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU UNIV
Publication Date
2012-10-03
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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