Method for preparing anti-crack log veneer

A log and anti-cracking technology, applied in the field of wood processing, can solve the problems of veneer processing quality impact, paper dust is difficult to remove, paper dust pollutes dyes and bleaching solutions, etc., to improve toughness and fluidity, reduce breakage rate, The effect of improving adhesion performance

Inactive Publication Date: 2017-08-18
DEHUA TB NEW DECORATION MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sticking wax paper is easy to produce a large amount of paper dust to pollute dyes and bleaching solutions during the subsequent veneer dyeing and bleaching processes, and the paper dust on the surface of the veneer is difficult to remove; The processing quality is easily affected

Method used

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  • Method for preparing anti-crack log veneer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Dissolve 100g rosin in 1200g solvent ethanol, then add 30g polyethylene glycol 400, adjust the pH of the reaction solution to be 8, heat to reflux reaction for 3 hours, cool to room temperature, remove the solvent by distillation under reduced pressure, and the residue in Vacuum-dried at 55°C, and then ground into 100-mesh powder, which is the modified rosin.

[0030] (2) A kind of anti-crack end capping glue, is made up of A, B two components, and described A component is made up of the component of following parts by weight: polyoxypropylene glycol 25 parts, hydroxymethyl cellulose 5 parts , 2 parts of polyoxyethylene oleate, 1 part of polyoxyethylene polyoxypropylene pentaerythritol ether, 8 parts of montmorillonite and 30 parts of ethyl acetate;

[0031] The B component is composed of the following components in parts by weight: 20 parts of isocyanate, 10 parts of modified rosin and 20 parts of ethyl acetate.

[0032] (3) Logs are cut off, peeled, placed in a c...

Embodiment 2

[0035] (1) Dissolve 100g rosin in 1000g solvent ethanol, then add 40g polyethylene glycol 600, adjust the pH of the reaction solution to 8.5, heat to reflux for 2 hours, cool to room temperature, remove the solvent by distillation under reduced pressure, and the residue in Vacuum-dried at 50°C, and then ground into 80-mesh powder, which is the modified rosin.

[0036] (2) A kind of anti-crack end capping glue, is made up of A, B two components, and described A component is made up of the component of following parts by weight: 30 parts of polyoxypropylene triols, 3 parts of hydroxymethyl cellulose , 1 part of sorbitan fatty acid ester, 2 parts of polyoxyethylene polyoxypropanolamine ether, 5 parts of montmorillonite and 25 parts of ethyl acetate;

[0037] The B component is composed of the following components in parts by weight: 15 parts of isocyanate, 5 parts of modified rosin and 25 parts of ethyl acetate.

[0038] (3) Logs are cut off and peeled, and placed in a cool and ...

Embodiment 3

[0041] (1) Dissolve 100g rosin in 2000g solvent ethanol, then add 20g polyethylene glycol 800, adjust the pH of the reaction solution to be 9, heat to reflux reaction for 4 hours, cool to room temperature, remove the solvent by distillation under reduced pressure, and the residue in Vacuum-dried at 60°C, and then ground into 200-mesh powder, which is the modified rosin.

[0042] (2) A kind of anti-crack end capping glue, is made up of A, B two components, and described A component is made up of the component of following parts by weight: polytetrahydrofuran diol

[0043] (3) Logs are cut off, peeled, placed in a cool and ventilated place and dried until the water content is 55%, and the amount of the anti-cracking sealing glue is 25g / m 2 .

[0044] (4) Apply anti-crack sealing glue to both ends of the log obtained in step (3), and after curing at room temperature for 10 hours, peel and cut into log veneers.

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Abstract

The invention provides a method for preparing an anti-crack log veneer. The method comprises the following steps: (1) cutting and peeling off log, placing the cut and peeled log in a cool and ventilate place, performing drying till the water content is 50-60%; (2) brushing two ends of the log with an anti-crack end-capping adhesive, performing curing at the room temperature, and performing rotary-cutting or slicing to obtain the log veneer. The anti-crack end-capping adhesive consists of a component A and a component B, wherein the component A comprises the following ingredients in parts by weight: 20-30 parts of active-hydrogen-containing resin, 3-8 parts of hydroxymethyl cellulose, 1-3 parts of an emulsifier, 1-3 parts of a defoamer, 5-10 parts of montmorillonite and 25-35 parts of ethyl acetate; the component B comprises the following components in parts by weight: 15-25 parts of isocyanate, 5-12 parts of modified rosin and 20-30 parts of ethyl acetate. The method for preparing the anti-crack log veneer is convenient to operate, the veneer has a good breakage prevention effect, the end-capping adhesive is high in bonding strength and low in probability of stripping, and meanwhile, the infested rate can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of wood processing, in particular to a method for preparing a log veneer, in particular to a method for preparing an anti-cracking log veneer. Background technique [0002] my country is the country with the largest artificial forest area in the world. Since the implementation of the natural forest protection project, measures have been taken to close mountains and cultivate forests across the country, which has greatly reduced the amount of natural forest harvesting, resulting in increasingly prominent contradictions between the supply and demand of natural forest timber in China. In recent years, with the national government's high attention and the development of social ecological construction, my country's forest coverage rate has risen to 20.36% year by year, with a total area of ​​195 million hectares, of which the preserved area of ​​artificial forests has reached 62 million hectares, which is close t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D5/14C09D7/12C08G18/48B27D5/00B27G11/00
CPCC09D175/08B27D5/00B27G11/00C08G18/4825C08G18/4829C08G18/4854C08G18/4887C08L2205/035C09D5/14C09D7/61C09D7/63C09D7/65C08L83/04C08L1/284C08L93/04C08K3/346C08K5/101
Inventor 程明娟詹先旭李延军卓艳
Owner DEHUA TB NEW DECORATION MATERIAL CO LTD
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