Composite curing agent and preparation method thereof

A technology of composite curing agent and formaldehyde copolymerized resin, which is applied in adhesive types, protein adhesives, starch adhesives, etc., can solve the problems of short resin pot life and inability to meet the needs of bonding, and achieve excellent physical and mechanical properties The effect of performance and weatherability

Active Publication Date: 2014-06-25
NANJING FORESTRY UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention proposes is a kind of composite curing agent of resorcinol-formaldehyde copolymerization resin and resorcinol-phenol-formaldehyde copolymerization resin and preparation method thereof, and its purpose aims at solving existing curing agent adding resorcinol-formaldehyde Formaldehyde copolymer resin and resorcinol-phenol-formaldehyde copolymer resin lead to a short pot life of the resin, which cannot meet the needs of the above two types of resins for the bonding of large-scale wood structural members

Method used

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  • Composite curing agent and preparation method thereof
  • Composite curing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0017] Knead 5 parts of paraformaldehyde powder, 10 parts of starch and 5 parts of China clay evenly, add 5 parts of water during the kneading process, so that the water content of the mixture is 20%; put the mixture with a water content of 20% and knead evenly in an extruder for puffing, puffing The temperature of the machine is 120°C, the puffing pressure is 5.0MPa, and the gelatinization rate of starch is 70%; after the puffed product is dried at low temperature, it is re-grinded into a powder of more than 200 mesh; the preparation of the composite curing agent is completed.

Embodiment 2

[0019] Knead 10 parts of paraformaldehyde powder, 10 parts of starch and 10 parts of chalk evenly, add 7.5 parts of water during the kneading process, so that the moisture content of the mixture is 20%; put the uniformly kneaded mixture with a moisture content of 20% in an extruder for puffing, puffing The temperature of the machine is 130°C, the puffing pressure is 5.5MPa, and the gelatinization rate of the starch is 72%. After the puffed product is dried at low temperature, it is re-grinded into a powder of more than 200 meshes; the preparation of the composite curing agent is completed.

Embodiment 3

[0021] Knead 15 parts of paraformaldehyde powder, 10 parts of starch and 5 parts of kaolin evenly, add 7.5 parts of water during the kneading process, so that the moisture content of the mixture is 20%; the kneaded mixture with a moisture content of 20% is placed in an extruder for puffing, puffing The temperature of the machine is 140°C, the puffing pressure is 6.0MPa, and the gelatinization rate of the starch is 75%. After the puffed product is dried at low temperature, it is re-pulverized into a powder of more than 200 meshes; the preparation of the composite curing agent is completed.

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Abstract

The invention relates to a resorcinol-formaldehyde resin/resorcinol-phenol-formaldehyde resin composite curing agent and a preparation method thereof. The composite curing agent is characterized by comprising the following components in parts by weight: 5-20 parts of polyformaldehyde or hexamethylenetetramine, 5-20 parts of starch or soybean protein isolate and 5-20 parts of inorganic substance powder. The composite curing agent has the advantages of normative technique and the like, and is simple to operate and easy to implement. The active period of the composite curing agent is more than 4 hours when being compounded with the resorcinol-formaldehyde resin and resorcinol-phenol-formaldehyde copolymer resin; and the composite curing agent can satisfy the requirements for active period of HLULAM, wood glulam beams, wood glulam columns, I beams and other wood structure components as well as large-size wood glulam furniture and other products with various shapes and sizes (especially irregular shapes and large size), and enables the bonded structure to have excellent physical and mechanical properties and weather resistance.

Description

technical field [0001] The invention relates to a composite curing agent of resorcinol-formaldehyde copolymer resin and resorcinol-phenol-formaldehyde copolymer resin and a preparation method thereof, belonging to the field of wood adhesive manufacture. Background technique [0002] Resorcinol-formaldehyde copolymer resin and resorcinol-phenol-formaldehyde copolymer resin for wood structural wood bonding are thermoplastic resins, namely resorcinol-formaldehyde copolymer resin and resorcinol-phenol-formaldehyde copolymer resin Raw material ratio should meet the following conditions: [0003] The molar ratio of formaldehyde (F) to resorcinol (R) in resorcinol-formaldehyde copolymer resin should be less than 1 (F / R<1); formaldehyde (F) in resorcinol-phenol-formaldehyde copolymer resin The molar ratio with resorcinol (R) and phenol (P) should be less than 1 (F / (R+P)<1). Paraformaldehyde or hexamethylenetetramine is often used as a curing agent to achieve rapid curing at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/12C09J159/00C09J103/02C09J189/00C09J11/04C09J11/06
Inventor 韩书广赵国敏周颖李子成申伟杰晏少侠崔举庆周兆兵周晓燕卢晓宁葛舰李海年
Owner NANJING FORESTRY UNIV
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