Preparation and application method of high-strength adhesive for laminated veneer lumber

A technology of laminated veneer lumber and adhesives, which is applied in the jointing of wooden veneers, non-polymer adhesive additives, adhesives, etc., can solve the problems of affecting the working environment of workers, strong smell, high price, etc., and achieve Avoid excessive condensation, simple preparation process, and time-saving effects

Active Publication Date: 2021-01-15
爱克太尔新材料(南京)有限公司
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Problems solved by technology

However, the currently used cold-setting adhesive is mainly resorcinol-formaldehyde resin, which is expensive and needs to be added with polyoxymethylene as a curing agent. Polyoxymethylene has a strong smell during operation, which affects the working environment of workers.

Method used

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  • Preparation and application method of high-strength adhesive for laminated veneer lumber
  • Preparation and application method of high-strength adhesive for laminated veneer lumber
  • Preparation and application method of high-strength adhesive for laminated veneer lumber

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Embodiment Construction

[0028] The technical solution of the present invention will be further described in detail below in conjunction with specific examples, but the protection scope of the present invention is not limited to the following description.

[0029] A preparation method for a high-strength adhesive for laminated veneer lumber, comprising the steps of:

[0030] S1 Preparation of lightly condensed phenolic resin: add water, phenol, sodium hydroxide aqueous solution and formaldehyde aqueous solution to the reaction kettle in sequence at 20-30°C, stir and react at a constant temperature of 58-62°C for 25-35min, and then heat up to 63- Stir and react at a constant temperature of 67°C for 25-35min. After reaching the cloud point, cool down to ≤30°C and discharge the material to obtain a slightly condensed phenolic resin for use;

[0031] S2 Preparation of conventional phenolic resin: Add water, phenol, sodium hydroxide aqueous solution and formaldehyde aqueous solution to the reaction kettle ...

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Abstract

The invention relates to preparation and using methods of a high-strength adhesive for a laminated veneer lumber. The preparation method comprises the following steps: S1, preparing slightly-condensedphenolic resin; S2, preparing conventional phenolic resin; and S3, preparing an adhesive, namely uniformly stirring and mixing the slightly-condensed phenolic resin prepared in the step S1, a resorcinol water solution, the conventional phenolic resin prepared in the step S2 and flour at 20-30 DEG C. The using method comprises the steps: coating the surface of the hot-pressed laminated veneer lumber within 15min by using the adhesive prepared in the step S3, carrying out cold pressing and curing to obtain a high-strength laminated veneer lumber, wherein the unit pressure of cold pressing is 10-12kg / cm<2>, and the cold pressing time is 10-15min. The preparation process is simple, a polycondensation process is easy to control, and the price advantage is obvious.

Description

technical field [0001] The invention relates to the technical field of laminated veneer lumber preparation, in particular to a method for preparing and using a high-strength adhesive for laminated veneer lumber. Background technique [0002] Laminated veneer lumber is a material formed by laminating thick veneers along the direction of the grain, hot pressing and gluing, and then sawing. Compared with solid wood, LVL has the advantages of uniform structure, high strength, and good dimensional stability due to the production method of one-way billet formation and parallel hot pressing, which can meet the needs of wood structure buildings, bridges, furniture, and transportation. Require. At present, my country's forest resources are poor, coupled with the implementation of the "Natural Forest Protection Project", people pay more and more attention to the use of fast-growing forests; and artificial fast-growing forests such as poplar and fir have soft materials, low strength, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/10C09J11/06C08G8/10B27D1/08
CPCB27D1/08C08G8/10C08L2205/025C09J11/06C09J161/06C08L61/06C08K5/13
Inventor 张茜
Owner 爱克太尔新材料(南京)有限公司
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