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Method of increasing curing speed of phenolic resin adhesive

A technology of phenolic resin adhesive and curing speed, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the limitations of the development and utilization of phenolic resin adhesives and market prospects, and it is difficult to maintain gluing Strength stability, strict requirements on veneer moisture content, etc., to achieve the effect of improving curing performance and thermal stability, film-forming and physical and mechanical properties, and reducing steric hindrance effects

Inactive Publication Date: 2019-02-22
合肥绿普包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the development of the adhesive industry, more and more types of adhesives have been developed and utilized, and phenolic resin adhesives have darker color, certain brittleness, and easy cracking, especially water-soluble phenolic resins. Compared with urea-formaldehyde resin, the curing time is longer, the curing temperature is higher, and the moisture content of the veneer is strictly required. In particular, the long curing time seriously affects the performance of the adhesive, which limits the development and utilization of phenolic resin adhesives. market expectation
However, the existing modification methods have complex processes, general modification effects, and high cost, making it difficult to maintain the stability of the bonding strength.

Method used

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  • Method of increasing curing speed of phenolic resin adhesive

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Effect test

Embodiment 1

[0016] A method for improving the curing speed of a phenolic resin adhesive. During the preparation of the phenolic resin, the phenolic resin and formaldehyde are reacted according to a molar ratio of 1:1.9. In the first step, all the phenolic resin is added to a three-necked flask, Then add formaldehyde with a mass percentage of 17%, after mixing evenly, add the prepared modified catalyst, turn off the heater after heating up to 66°C for reaction, and after the reaction lasts for 30 minutes, control the reaction temperature in the range of 88-90°C, Continue to react for 40 minutes; in the second step, add the remaining formaldehyde into the reaction system, react at 85-88°C for 35 minutes, cool naturally to 34°C, and the gel can be released; the preparation method of the modified catalyst includes The following steps:

[0017] (1) Weigh 18.5 grams of zinc acetate dihydrate and 1.9 grams of nano-titanium dioxide, add them in turn to a beaker containing 150 ml of absolute ethan...

Embodiment 2

[0024] A method for increasing the curing speed of a phenolic resin adhesive. During the preparation of the phenolic resin, the phenolic resin and formaldehyde are reacted according to a molar ratio of 1:1.95. In the first step, all the phenolic resin is added to a three-necked flask. Then add formaldehyde with a mass percentage of 18.5%, after mixing evenly, add the prepared modified catalyst, turn off the heater to react after heating up to 67°C, and control the reaction temperature in the range of 88-90°C after the reaction is carried out for 32 minutes. Continue to react for 45 minutes; in the second step, add the remaining formaldehyde into the reaction system, react at 85-88°C for 38 minutes, cool naturally to 35°C, and the gel can be released; the preparation method of the modified catalyst includes The following steps:

[0025] (1) Weigh 18.6 grams of zinc acetate dihydrate and 1.95 grams of nano-titanium dioxide, add them in turn to a beaker containing 155 ml of absol...

Embodiment 3

[0032]A method for improving the curing speed of a phenolic resin adhesive. During the preparation of the phenolic resin, the phenolic resin and formaldehyde are reacted according to a molar ratio of 1:2.0. In the first step, all the phenolic resin is added to a three-necked flask. Then add formaldehyde with a mass percentage of 20%, after mixing evenly, add the prepared modified catalyst, turn off the heater after heating up to 68°C for reaction, and after the reaction lasts for 35 minutes, control the reaction temperature in the range of 88-90°C, Continue to react for 50 minutes; in the second step, add the remaining formaldehyde into the reaction system, react at 85-88°C for 40 minutes, cool naturally to 36°C, and the gel can be released; the preparation method of the modified catalyst includes The following steps:

[0033] (1) Weigh 18.7 grams of zinc acetate dihydrate and 2.0 grams of nano-titanium dioxide, add them in turn to a beaker containing 160 ml of absolute ethano...

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Abstract

The invention relates to the technical field of novel functional materials and discloses a method of increasing curing speed of phenolic resin adhesive. In the phenolic resin preparation process, phenolic aldehyde and formaldehyde are mixed in the molar ratio of 1:(1.9-2.0) for reaction; first, all phenolic resin is added to a three-neck flask, formaldehyde 17-20% in mass percentage is added, andmixing is performed to prepare a modifying catalyst; second, the residual formaldehyde is added to the reaction system; catalytic modification helps reduce steric hinderance effect, improve ortho-reaction activity of phenols, and inhibit the generation of aldehyde gas; curing performance and thermal stability of the phenolic resin adhesive are successfully improved; the problem is overcome that existing phenolic resin adhesive has high water content and hindered water molecular diffusion and therefore, is low in curing speed and poor in stability; the phenolic resin adhesive has high durability and adhesive strength, better temperature resistance and evidently extended service life.

Description

technical field [0001] The invention belongs to the technical field of new functional materials, and in particular relates to a method for increasing the curing speed of a phenolic resin adhesive. Background technique [0002] Phenolic resin is a general term for resins formed by phenols and aldehydes under the action of catalysts. It is the earliest industrialized (1910, Bakelite, Germany) synthetic polymer material. For nearly a century, it has been used in many industrial fields, and it is still an important synthetic polymer material. In the field of wood processing, phenolic resin is one of the main glues widely used, and its consumption is second only to urea-formaldehyde resin. Especially in the production of water-resistant and weather-resistant wood products, phenolic resin has special significance. Phenolic resin adhesives have the characteristics of good heat resistance, high bonding strength, good aging resistance and electrical insulation, and are cheap and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G8/08C09J161/14
CPCC08G8/08C08G8/28C09J161/14
Inventor 张腾飞
Owner 合肥绿普包装材料有限公司
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