Preparation method for modified oxidized starch formaldehyde-free plywood

A technology of oxidized starch and plywood, which is applied in plywood presses, starch-derived adhesives, and joints of wooden veneers. Simple and environmentally friendly

Active Publication Date: 2016-12-07
东易日盛智能家居科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the existing plywood contains free formaldehyde, which will cause harm to the human body, but the ammonia gas penetration treatment is used, the preparation process is complicated, and the required cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First weigh 500g of poplar wood, put it into a pulverizer and crush it, pass through a 100-mesh sieve, put the sieved poplar wood powder into the steam explosion tank, feed 2.2MPa saturated water vapor into the steam explosion tank, and keep the pressure for 5 minutes Instantly open the valve of the steam explosion tank, depressurize to normal pressure, take out the poplar wood powder, soak it in 800mL of deionized water at a temperature of 90°C for 50min, take it out, transfer it to 500mL of 10% hydrogen peroxide solution at 75 Under a constant temperature water bath at ℃, react for 2 hours, vacuum filter, soak the filter cake in 200mL sodium hydroxide solution with a mass fraction of 2%, leaching for 4 hours under a constant temperature water bath at 85℃, wash the filter residue with absolute ethanol and deionized water Until the washing solution is neutral, transfer it to a 110°C drying oven to dry to constant weight to obtain poplar fiber; then weigh 9g of the above ...

example 2

[0021]First weigh 300g of poplar wood, put it into a pulverizer and crush it, pass through a 100-mesh sieve, put the sieved poplar wood powder into the steam explosion tank, feed 1.8MPa saturated water vapor into the steam explosion tank, and keep the pressure for 3 minutes Instantly open the valve of the steam explosion tank, depressurize to normal pressure, take out the poplar wood powder, soak it in 600mL deionized water with a temperature of 80°C for 40min, take it out, transfer it to 300mL of 10% hydrogen peroxide solution at 70 In a constant temperature water bath at ℃, react for 1 hour, vacuum filter, soak the filter cake in 100mL sodium hydroxide solution with a mass fraction of 2%, leaching for 3 hours in a constant temperature water bath at 80℃, wash the filter residue with absolute ethanol and deionized water Until the washing solution is neutral, transfer it to a 105°C drying oven to dry to constant weight to obtain poplar fiber; then weigh 6g of the above-mentioned...

example 3

[0024] First weigh 400g of poplar wood, put it into a pulverizer and crush it, pass through a 100-mesh sieve, put the sieved poplar wood powder into the steam explosion tank, feed 1.9MPa saturated water vapor into the steam explosion tank, and keep the pressure for 4 minutes Instantly open the valve of the steam explosion tank, decompress to normal pressure, take out poplar wood powder, soak it in 700mL deionized water at 85°C for 45min, take it out, transfer it to 400mL hydrogen peroxide solution with a mass fraction of 10%, at 72 In a constant temperature water bath at ℃, react for 2 hours, vacuum filter, soak the filter cake in 150mL sodium hydroxide solution with a mass fraction of 2%, leaching for 3 hours in a constant temperature water bath at 82℃, wash the filter residue with absolute ethanol and deionized water Until the washing solution is neutral, transfer it to a 107°C drying oven to dry to constant weight to obtain poplar fiber; then weigh 7g of the above poplar fib...

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Abstract

The invention relates to a preparation method for modified oxidized starch formaldehyde-free plywood, and belongs to the technical field of plate preparation. The preparation method disclosed by the invention comprises the following steps: firstly, performing treatment on poplar blocks to obtain poplar fibers; then, performing nanometer treatment on the poplar fibers to obtain poplar nanofibers; then, performing acidolysis on pregelatinized corn starch, and then, enabling the pregelatinized corn starch to react with potassium peroxodisulfate; performing cross-linking reaction between prepared oxidized starch and borax; then, adding the prepared poplar nanofibers to obtain modified oxidized starch adhesive; finally, coating poplar veneers with the modified oxidized starch adhesive; forming plate blanks according to an odd level principle and the principle that fiber directions of adjacent veneers are mutually perpendicular; and performing hot press molding on the plate blanks to obtain the modified oxidized starch formaldehyde-free plywood. The modified oxidized starch formaldehyde-free plywood prepared by the preparation method disclosed by the invention does not contain free formaldehyde, and cannot release other harmful gases, and the preparation process is simple, and required cost is low.

Description

technical field [0001] The invention relates to a method for preparing modified oxidized starch formaldehyde-free plywood, which belongs to the technical field of board preparation. Background technique [0002] Plywood refers to a kind of wood-based panel made of veneers with different grain directions. The veneer textures of its adjacent layers usually form a 90° angle with each other. Plywood is a three-layer or multi-layer board-like material made of wood sections that are peeled into veneers or sliced ​​into thin wood, and then glued together with adhesives. , 6 layers and other even-numbered layers. Because plywood has the characteristics of small deformation, large format, convenient construction, not easy to warp, and high tensile strength of transverse grain, it is widely used in furniture, carriages, shipbuilding, military industry, packaging and other industrial sectors. [0003] In the prior art, formaldehyde-free plywood only does not use the so-called three-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27G11/00B27D3/00C09J103/10C09J11/04C09J11/08
CPCB27D1/08B27D3/00B27G11/00C08L2205/16C09J11/04C09J11/08C09J103/10C08L97/02C08K2003/387
Inventor 周荣薛培龙王龙
Owner 东易日盛智能家居科技有限公司
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