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A kind of wood functional modification weighting agent and preparation method thereof

The technology of a weighting agent and wood adhesive is applied in the field of wood functional modification weighting agent and its preparation, which can solve the problems of high free phenol content, high cost, environmental safety hazards, etc., and achieves obvious modification weighting effect and moisture absorption. rate reduction effect

Inactive Publication Date: 2019-10-25
高昇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many studies and practices have been carried out on the modification and weight gain of plantation fast-growing wood by using modifiers at home and abroad, but the main problem is that the use of modifiers with urea-formaldehyde resin or phenolic resin as the main component will cause in-products. Harmful free aldehydes or toxic free phenols have high content, large dosage, high cost, and the production and use process endangers environmental safety, etc.

Method used

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  • A kind of wood functional modification weighting agent and preparation method thereof

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preparation example Construction

[0014] figure 1 A schematic flow chart showing the order of adding various substances and the manufacturing method for preparing the wood function modified weighting agent of the present invention. see figure 1 , add 90-95kg of water into the reactor, and when the temperature rises rapidly to 92°C-98°C; start the reactor mixer, and slowly add 10-12kg of polyvinyl alcohol within 15 minutes, until the polyvinyl alcohol is completely melted and then cooled to 77 ℃-83℃, stirring for 10 minutes; while cooling down to 57℃-63℃, slowly add 3-5kg calcium carbonate, 1.8-2.3kg bentonite (montmorillonite can also be used), 3.0-3.5kg dicyandiamide ( It can also be replaced by ammonium dihydrogen phosphate), this process is basically completed synchronously; when cooling to 27°C-33°C, add 40-45kg lignin-modified phenolic resin wood adhesive (solid content 25%) and stir for 10-20 minutes Take it out of the pot, and prepare the wood function modified weighting agent. Bentonite or montmoril...

Embodiment 1

[0018] Add 90kg of water into the reactor, and when the temperature is rapidly raised to 95°C; start the mixer in the reactor, and continuously and slowly add 10kg of polyvinyl alcohol within 15 minutes until the polyvinyl alcohol is completely melted, then cool down to 80°C, and stir for 10 minutes; cool down to Slowly add 3.0kg of calcium carbonate, 2.0kg of bentonite, and 3.2kg of dicyandiamide at 60°C, and the process is basically completed simultaneously; when cooled to 30°C, add 42kg of lignin-modified phenolic resin wood adhesive and stir for 15 minutes out of the pan.

[0019] Dry the fast-growing poplar floor boards that need to be modified to a moisture content of 10%. 40 pieces of fast-growing poplar floor boards (length 1125mm, width 125mm, thickness 24mm) were modified by using fast-growing poplar functional modified weighting agent. The volume of the treatment tank is 1.0 cubic meters, and the treatment time is about 400 minutes. First place the floor blank in ...

Embodiment 2

[0023] Add 93kg of water into the reaction kettle, and when the temperature rises rapidly to 92°C; start the stirrer in the reaction kettle, continuously and slowly add 11kg of polyvinyl alcohol within 15 minutes, until the polyvinyl alcohol is completely melted, cool down to 77°C, and stir for 10 minutes; cool down to Slowly add 4kg of calcium carbonate, 1.8kg of bentonite, and 3.0kg of dicyandiamide at 57°C, and the process is basically completed simultaneously; when cooled to 27°C, add 40kg of lignin-modified phenolic resin wood adhesive and stir for 10 minutes to produce pot.

[0024] The fast-growing poplar floor boards that need to be modified are dried to a moisture content of 8%. 40 pieces of fast-growing poplar floor boards (length 1125mm, width 125mm, thickness 24mm) were modified by using fast-growing poplar functional modified weighting agent. The volume of the treatment tank is 1.0 cubic meters, and the treatment time is about 400 minutes. First place the floor ...

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Abstract

The invention provides a wood functional modified weighting agent and a preparation method thereof. The method comprises the following steps: adding 90 to 95 kg of water into a reaction kettle, and heating the water to first temperature; starting a stirrer of the reaction kettle, adding 10 to 12 kg of polyvinyl alcohol till the polyvinyl alcohol is completely dissolved and reducing the temperature to second temperature, and stirring the polyvinyl alcohol for 10 minutes; when the temperature is reduced to third temperature, adding 3 to 5 kg of calcium carbonate, 1.8 to 2.3 kg of bentonite or montmorillonite and 3.0 to 3.5 kg of dicyandiamide or ammonium dihydrogen phosphate; when the temperature is reduced to fourth temperature, adding 40 to 45 kg of a lignin modified phenolic resin wood adhesive, stirring the adhesive for 10 to 20 minutes, and then taking a product out of the kettle, thus preparing the wood functional modified weighting agent. The modified weighting agent prepared through the preparation method disclosed by the invention has an obvious modified weighting effect on fast grown poplars, and the weighting rate is about 28 percent.

Description

technical field [0001] The embodiment of the present invention relates to a wood function modified weighting agent and a preparation method thereof. Background technique [0002] The area of ​​my country's plantation ranks first in the world, among which the fast-growing poplar accounts for more than 65%. Due to the short growth period of the plantation forest, the fast-growing wood has a soft material, low strength, easy warping, and large deformation. However, it is necessary to develop the production technology of plantation fast-growing wood products with modified functions and increased weight, improve the quality of plantation fast-growing wood, expand the utilization of plantation fast-growing wood, and gradually replace natural forest products with plantation fast-growing wood products. It is of great significance to solve the major industry problems of the shortage of timber resources in my country, the shortage of high-quality broad-leaved timber and large-diameter t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/14C08L29/04C08K13/02C08K3/26C08K3/34C08K5/315C08K3/32
CPCC08K2003/265C08K2003/322C08L61/14C08L29/04C08K13/02C08K3/26C08K3/346C08K5/3155C08K3/32
Inventor 高升李年存张仲凤彭万喜张明龙甘汶曦毛霞
Owner 高昇