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Method for producing wheat straw fiberboard by utilizing UF (urea formaldehyde) resin

A resin glue and fiberboard technology, applied in the pretreatment of molding materials, household components, flat products, etc., can solve the problems of uncompetitive straw wood-based panels, poor bonding performance of wood-based panels, and expensive isocyanates, etc., and achieve production costs. Inexpensive, high internal bond strength, improved surface properties

Inactive Publication Date: 2014-09-24
合肥安诺新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest difficulty in using urea-formaldehyde resin as an adhesive is the poor bonding performance of wood-based panels, which directly leads to low internal bonding strength and affects its performance.
Although the wheat straw board prepared with isocyanate as adhesive has good physical properties, isocyanate is expensive and its initial viscosity is poor, making straw wood-based boards uncompetitive in the market.

Method used

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  • Method for producing wheat straw fiberboard by utilizing UF (urea formaldehyde) resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method that UF resin glue produces wheat straw fiberboard, comprises the following steps:

[0021] (1) Material preparation: select the raw material of wheat straw for cutting, and the particle size is 2-3mm;

[0022] (2) Pretreatment: put the wheat straw granules in (1) above in a pot, add 20 IU of xylanase per gram of wheat straw granules (produced by Ningxia Hersbit Biotechnology Co., Ltd., the enzyme activity is 156 IU / mL, containing 1 IU / mL of cellulase activity), adjust the pH value to 4.5, and soak at 50°C for 4 hours;

[0023] (3) Wet milling: the wheat straw particles pretreated in (2) above are subjected to fiber separation in a disk mill, and then dried to a moisture content of 8%;

[0024] (4) Sizing: Weigh 12% UF resin glue (50% solid content, 130MPa / s viscosity) and 1% curing agent by weight of wheat straw and add it to the above (3) wheat straw. After uniform mixing, pave into a slab with a surface size of 300mm×300mm;

[0025] (5) Pre-pressing: P...

Embodiment 2

[0030] UF resin glue produces the method for wheat straw fiber board, adds xylanase 10 IU with every gram wheat straw particle,

[0031] All the other are the same as in Example 1.

[0032] According to the national standard GB / T 11718-1999, the prepared boards were tested for finished board density D, internal bond strength IB, static bending strength MOR, water absorption thickness expansion rate (TS / 2hr), and the test results are shown in Table 1.

Embodiment 3

[0034] UF resin glue produces the method for wheat straw fiber board, adds xylanase 30 IU with every gram wheat straw particle,

[0035] All the other are the same as in Example 1.

[0036] The finished products were tested according to the national standard GB / T 11718-1999 for finished board density D, internal bond strength IB, static bending strength MOR, water absorption thickness expansion rate (TS / 2hr), and the test results are shown in Table 1.

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Abstract

The invention discloses a method for producing a wheat straw fiberboard by utilizing UF (urea formaldehyde) resin. The method comprises the steps of material preparation, pretreatment, wet grinding, sizing, pre-pressing, hot pressing and post treatment. The method is low in production cost, and a production process is simple; xylanase is used for the pretreatment of wheat straws, so that surface properties of the wheat straws are improved, and the bonding strength of a UF resin adhesive and the wheat straws is strengthened; the prepared wheat straw fiberboard has high physical properties of strong internal bonding strength, strong tensile strength and the like.

Description

technical field [0001] The invention relates to a production process of a wheat straw board, in particular to a method for producing a wheat straw fiberboard by utilizing UF resin glue. Background technique [0002] At present, my country is both a big producer of wood-based panels and a big consumer of wood. Due to the long-term excessive logging of trees and other forms of vegetation damage, it has caused adverse consequences such as soil erosion, frequent floods, severe sandstorms, and deterioration of the ecological environment in my country. At the same time, the comprehensive utilization rate of wood in my country is relatively low, only about 60%, which is far behind the developed countries in the world, which are generally 90-95%. Therefore, the contradiction between supply and demand of wood will become increasingly prominent, and saving wood and developing wood substitutes will be the long-term development direction of my country's forestry industry. [0003] As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N3/12B27N1/00
Inventor 张显宝
Owner 合肥安诺新型建材有限公司