Manufacturing method of thick and light straw wall material

A technology of wall materials and manufacturing methods, applied in building materials, solid waste management, sustainable waste treatment, etc., can solve the problems of unreachable product quality and long time, shorten the hot pressing cycle, increase productivity, and reduce product cost effect

Inactive Publication Date: 2010-12-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a method for manufacturing thick and lightweight straw wall materials, the purpose of which is to solve the problem that traditional

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] After the wheat straw is air-dried and stored, the moisture content of the straw is 6%. First, it is cut to a length of 3-5mm by a grass cutter, and 1% of the MDI adhesive (accounting for the weight ratio of the raw material) is applied, and then the slab is paved and the slab is The upper and lower surfaces are coated with a release agent, and sent to a spray steam press for hot pressing. After the slab is first compressed, the upper and lower surfaces of the slab are heated by contacting the hot pressing plate at 145°C, and the slab is also heated by 0.3MPa~ from the upper and lower surfaces. 0.6MPa pressure steam injection, the steaming time is 10s, so that the overall thickness of the slab is heated rapidly, and at the same time, the MDI glue in the slab is excited and induced by high-temperature water vapor, and expands rapidly and foams. The total hot pressing time is 6s / mm; so that under the condition of shorter hot pressing time than the conventional one, the th...

Embodiment 2

[0013] After the rice straw is air-dried and stored, the moisture content of the straw is 10%, and it is first cut to a length of 2-5mm by a grass cutter, and 2.5% of MDI adhesive and 1.50‰ of anti-corrosion and anti-fungal agent or flame retardant are applied to account for 5% of the raw material weight ratio. , then pave the slab and apply a release agent to the upper and lower surfaces of the slab, and send it to the spray steam press for hot pressing. After the slab is compressed to a certain extent, the upper and lower surfaces of the slab are heated by a 150°C hot-pressing plate At the same time, the slab is also sprayed with 0.2MPa~0.5MPa pressure steam from the upper and lower tables, and the steaming time is 12s, so that the overall thickness direction of the slab is rapidly heated, and at the same time, the MDI glue in the slab is excited and induced by high-temperature water vapor, and expands rapidly For foaming, the total hot-pressing time is 8s / mm; thus, under the...

Embodiment 3

[0015] After the corn stalks are air-dried and stored, the moisture content of the stalks is 18%, and they are first cut to a length of 4-7mm by a grass cutter, and the MDI adhesive accounts for 5.0% of the raw material weight ratio and 0.2‰ of the raw material weight ratio. The agent accounts for 5% to 15% of the weight ratio of the raw materials. Then the slab is paved and the release agent is applied to the upper and lower surfaces of the slab, and then sent to the spray steam press for hot pressing. After the slab is compressed to a certain extent, the upper and lower surfaces of the slab are The surface is contacted and heated by a 165°C hot-pressed plate, and the slab is also sprayed with steam at a pressure of 0.3MPa to 0.7MPa from the upper and lower surfaces. The steaming time is 15s, so that the overall thickness direction of the slab is heated rapidly, and at the same time, the MDI glue in the slab Excited and induced by high-temperature water vapor, it expands rapid...

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Abstract

The invention discloses a manufacturing method of a thick and light straw wall material. Wheat straw, straw and corn straw serve as raw materials. The moisture content of the raw materials is controlled to be 6-18%; after the raw materials are cut, applied with MDI adhesive and/ or applied with anti-corrosion preservative and fire retardant, paved and assembled, the raw materials are sent into an injecting and steaming press; the upper surface and the lower surface of a slab are heated by contacting with a heating platen; meanwhile, the slab is injected by upper and lower high-temperature steam; the integral thickness direction of the slab can be quickly heated; and meanwhile, water vapor catalysis and excitation causes MDI glue in the slab to be quickly puffed to foam, thus preparing the heat reservation straw wall material with the thickness of 35-150 mm and the density of 0.15-0.5 g/cm<3>. The invention has the advantages that the heat reservation straw wall material has large thickness and light weight, has the performances of insect prevention, anticorrosion and fire protection and has simple manufacturing technology. Hot-pressing time is 1/5-1/10 of the traditional hot-pressing time. The manufacturing method of the thick and light straw wall material has short product manufacturing time, favourable shape stability, energy saving and low cost.

Description

technical field [0001] The invention relates to a method for manufacturing a thick and lightweight straw wall material, which belongs to the technical field of wood-based panel manufacturing. Background technique [0002] Every harvest season, farmers burn straws on the spot, polluting the environment and affecting traffic, which has become a serious social nuisance. Using crop straws as raw materials for wood-based panels is to improve the ecological environment and strengthen the efficient use of agricultural waste resources, which not only protects the environment, but also provides raw materials for factories. Good economic and environmental benefits can be obtained. However, it takes a long time for traditional equipment to manufacture thick and lightweight straw wall materials and is technically difficult. A method of making thick lightweight straw wall materials has not been reported yet. Contents of the invention [0003] The present invention proposes a method ...

Claims

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Application Information

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IPC IPC(8): E04C2/24C04B26/10C04B18/24
CPCY02W30/91
Inventor 徐咏兰金菊婉周定国华毓坤周晓燕梅长彤张洋李显成
Owner NANJING FORESTRY UNIV
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