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Preparation method of glue-free mould pressing artificial board

A technology of wood-based panels and plastic molds, applied in the direction of pretreatment of flat products, manufacturing tools, and molding materials, to achieve the effects of accelerating decomposition and hydrolysis, increasing viscosity, and simple process

Active Publication Date: 2020-12-29
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of traditional wood-based panels is generally by applying a certain amount of synthetic resin adhesive to bond shavings, fibers or veneers into boards, and the wood-based panels made of this type of adhesive have the largest loss during storage and use. The problem is the long-term release of free formaldehyde

Method used

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  • Preparation method of glue-free mould pressing artificial board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a glue-free molded wood-based panel, the operation steps are as follows:

[0026] S1: Straw pretreatment: crush wheat straw into 0.1-3cm straw segments, add a mixed solution of cellulase and pectinase with a volume ratio of 1.2, containing cellulase (0.5%) and pectinase (0.5%), at 20°C After soaking for 3 hours, add sodium hydroxide aqueous solution with a volume ratio of 1:1 and a mass fraction of 1% and soak for 2 hours at 20°C;

[0027] S2: Wood pretreatment: crush the wood waste into small pieces with a length ≤ 5cm, a width ≤ 3cm, and a thickness ≤ 2cm for later use;

[0028] S3: High temperature treatment: Add the crushed wood waste described in step S2 into the impregnation solution described in step S1, the mass ratio of wood waste and straw is 1:1, cook at 180°C for 20min, and then dry until the water is 10%.

[0029] S4: pre-press forming: adding the straw mixture described in step S3 to a pre-press, 150°C, 0.8Mpa, pre-press for 5min, ...

Embodiment 2

[0032] A method for preparing a glue-free molded wood-based panel, the operation steps are as follows:

[0033] S1: Straw pretreatment: crush wheat straw into 0.1-3cm straw segments, add a mixed solution of cellulase and pectinase with a volume ratio of 1.2, containing cellulase (0.5%) and pectinase (0.5%), at 20°C After soaking for 3 hours, add sodium hydroxide aqueous solution with a volume ratio of 1:1 and a mass fraction of 1% and soak for 2 hours at 20°C;

[0034] S2: Wood pretreatment: crush the wood waste into small pieces with a length ≤ 5cm, a width ≤ 3cm, and a thickness ≤ 2cm for later use;

[0035] S3: High temperature treatment: Add the crushed wood waste described in step S2 into the impregnation solution described in step S1, the mass ratio of wood waste to straw is 1:1, cook at 180°C for 20min, and then dry until the water is 10%.

[0036] S4: pre-press forming: adding the straw mixture described in step S3 to a pre-press, 160°C, 0.8Mpa, pre-press for 6min, t...

Embodiment 3

[0039] A method for preparing a glue-free molded wood-based panel, the operation steps are as follows:

[0040] S1: Straw pretreatment: crush wheat straw into 0.1-3cm straw segments, add a mixed solution of cellulase and pectinase at a volume ratio of 1.2, containing cellulase (0.5%) and pectinase (0.5%), at 20 degrees Celsius After soaking for 3 hours, add sodium hydroxide aqueous solution with a volume ratio of 1:1 and a mass fraction of 1% and soak for 2 hours at 20°C;

[0041] S2: Wood pretreatment: crush the wood waste into small pieces with a length ≤ 5cm, a width ≤ 3cm, and a thickness ≤ 2cm for later use;

[0042] S3: High temperature treatment: Add the crushed wood waste described in step S2 into the impregnation solution described in step S1, the mass ratio of wood waste to straw is 2:1, cook at 190°C for 15 minutes, and then dry until the water is 10%.

[0043] S4: Pre-press forming: adding the straw mixture described in step S3 to a pre-press, 150°C, 1Mpa, pre-pr...

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Abstract

The invention discloses a preparation method of a glue-free mould pressing artificial board. The method comprises the following steps: S1, straw pretreatment: pulverizing plant straws, and carrying out two-step impregnation by using a cellulase and pectinase mixed solution and alkali liquor; S2, wood pretreatment, specifically, smashing wood waste for use; S3, high-temperature treatment, namely performing high-temperature treatment on the raw materials in the step S2 and the step S1, and drying the materials for later use; S4, pre-pressing forming, specifically, adding the mixture obtained inthe step S3 into a pre-pressed plate blank; and S5, hot-pressing board forming, specifically, hot-pressing the board blank in the step S4 into the glue-free template artificial board. According to themethod, straw treated by alkali liquor is used as an adhesive, cellulose and lignin in wood are used as a framework, and the adhesive-free mould pressing artificial board is prepared through high-temperature extrusion. No adhesive is used in the process, the preparation process is environmentally friendly, the prepared artificial board does not contain formaldehyde, and the requirements of modernpeople for health and environmental protection are met.

Description

technical field [0001] The invention belongs to the field of artificial board preparation, and in particular relates to a method for preparing a glue-free molded artificial board. Background technique [0002] Wood-based panels are boards or molded products made of wood or other non-wood plants, which are separated into various unit materials after certain mechanical processing, and then glued with or without adhesives and other additives. The production of traditional wood-based panels is generally by applying a certain amount of synthetic resin adhesive to bond shavings, fibers or veneers into boards, and the wood-based panels made of this type of adhesive have the largest loss during storage and use. The problem is the long-term release of free formaldehyde. With the development of economy and society, people's requirements for quality of life are getting higher and higher, and the awareness of the harm caused by free formaldehyde is also increasing rapidly. If you want...

Claims

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Application Information

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IPC IPC(8): B27K3/04B27N1/00B27N3/08B27N3/10
CPCB27N3/10B27N3/08B27N1/00B27K3/04
Inventor 葛省波夏常磊左世达吴英姬石洋罗永宏
Owner NANJING FORESTRY UNIV
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