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Method for manufacturing flash evaporation defibricating glue-free light crops stalk fibrous composite material

A fiber composite material, crop straw technology, applied in the direction of manufacturing tools, pretreatment of molding materials, flat products, etc., can solve problems such as large waste water and product limitations, and achieve the effects of reducing production costs, simplifying production processes, and improving strength.

Inactive Publication Date: 2009-09-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this process will generate a large amount of waste water during the production process, and the products are limited to high-density thin plates, this production process has been basically eliminated at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The pressed density is 0.5g / cm3, and the thickness is 8mm. Cotton stalk lightweight fiber composite material: Cotton stalk is used as raw material, and it is processed into a unit with a length of 30mm, and the moisture content is controlled at 50%. Put the cotton stalk unit into the steam explosion processor, pass in 0.6MPa saturated steam for about 8 minutes, then increase the saturated steam pressure to 1.5MPa and treat for 5 minutes, release the pressure suddenly and discharge, and the cotton stalks are dissociated into fibers. After drying to a moisture content of about 15%, it is paved and formed, and then sent to a spray steam hot press after pre-pressing. The injection steam pressure is 0.6MPa, the injection steaming time is 30s, the hot-pressing temperature is 190°C, and the hot-pressing time is 4min.

Embodiment 2

[0013] Pressed density is 0.3g / cm 3 , 30mm thick non-adhesive cotton stalk lightweight fiber composite material: use cotton stalk as raw material, process it into units with a length of 20mm, and control the moisture content at about 55%. Put the cotton stalk unit into the steam explosion processor, pass in 1.0MPa saturated steam for 5 minutes, then increase the saturated steam pressure to 1.9MPa and treat for 2 minutes, release the pressure suddenly and discharge, and the cotton stalks are dissociated into fibers. After drying to a moisture content of about 25%, it is paved and shaped, pre-pressed and then sent to a spray steam hot press. The injection steam pressure is 1.0MPa, the injection steaming time is 10s, the hot-pressing temperature is 180°C, and the hot-pressing time is 15min.

Embodiment 3

[0015] Pressed density is 0.4g / cm 3 , thickness of 20mm non-adhesive cotton stalk lightweight fiber composite material: cotton stalks are used as raw materials, processed into units with a length of 25mm, and the moisture content is controlled at about 60%. Put the cotton stalk unit into the steam explosion processor, pass in 0.8MPa saturated steam for about 7 minutes, then increase the saturated steam pressure to 1.7MPa and treat for 3 minutes, release the pressure suddenly and discharge, and the cotton stalks are dissociated into fibers. After drying to a moisture content of about 20%, it is paved and formed, and then sent to a spray steam hot press after pre-pressing. The injection steam pressure is 0.8MPa, the injection steaming time is 20s, the hot pressing temperature is 180°C, and the hot pressing time is 10min.

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Abstract

The present invention is a manufacturing method of flash defiberization and non-adhesive lightweight agricultural crop straw fiber composite material. The process is to crush straw raw materials into units with a length of 20-30mm and a moisture content of 50-60%, and then put the straw units into steam explosion treatment. In the device, high-temperature and high-pressure saturated water steam is introduced for cooking, and then the valve is suddenly opened to release the pressure and the material is discharged. The two-stage steam explosion treatment process is adopted: the straw unit is pretreated for 5-8 minutes at a lower steam pressure, and then at a higher steam pressure. Treat under steam pressure for 2 to 5 minutes, then suddenly open the valve to release the pressure and discharge to obtain dissociated fibers; the slab is formed; the closed spray steam hot pressing process is adopted, the steam pressure is 0.6-1.0MPa, the steam spray time is 10-30s, and the steam spray Finally, seal the surrounding area of ​​the slab, the hot-pressing temperature is 180-190°C, and the hot-pressing time is 4-15 minutes. Advantages: There is no environmental pollution during the production and use of the product; the glue sizing process is omitted, and the production cost is reduced; light-weight plates of different thicknesses are produced.

Description

technical field [0001] The present invention relates to a manufacturing method of flash defiberization and non-adhesive lightweight agricultural crop straw fiber composite material, which uses crop straw as raw material and undergoes processes such as crushing, flash defiberization, drying, paving, pre-pressing, sealing, spraying, steaming and hot pressing. A manufacturing method for making lightweight crop straw fiber composites free of adhesives and any activators or catalysts. The invention belongs to the technical field of plant fiber composite materials. Background technique [0002] Due to the glue-making and board-making process and the environmental conditions of the board, the wood-based board made of urea-formaldehyde glue has the problem of free formaldehyde release, and it is long-term, stubborn and repetitive. There are only two ways to essentially solve the technical problem of free formaldehyde release from wood-based panels: one is to use formaldehyde-free a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/04B27N1/00B27N3/08B27N3/10
Inventor 周晓燕何翠芳周定国徐咏兰梅长彤崔举庆连海兰徐信武
Owner NANJING FORESTRY UNIV
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