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Composite straw board and preparation method thereof

A technology for straw board and crop straw, which is applied in sustainable waste treatment, solid waste management, climate sustainability and other directions, can solve the problems of increasing straw production cost, exhaust gas emission, high energy consumption, etc. speed up and stimulate the effect of

Active Publication Date: 2017-02-08
四川什邡国正环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is not difficult to see that the problems of the above-mentioned patents are: in addition to river sand, chlorinated paraffin, methyl cellulose, kaolin, diatomaceous earth, nano-silica (even the cost of ultrafine powder is relatively high), silane, etc., are all More expensive raw materials increase the production cost of straw
Use pottery clay etc. to modify, heat and stir at 50-60°C, steam the green body at 60-80°C, and finally heat it to 170-180°C, and maintain it under high heat and high pressure for 2-4 hours, involving 180°C steam, high pressure is necessary Boilers, involving safety, high energy consumption, and exhaust emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035]A preparation method of a composite straw board, by increasing the clinker content of commonly used sulphoaluminate cement, adding hydraulic calcium oxide as an activator, and then mixing it into composite sulphoaluminate cement as a gelling agent, and cementing Made from crop straw. (That is, in the sulphoaluminate cement commonly used in existing finished products, the content of sulphoaluminate cement clinker is increased, and then hydraulic calcium oxide is added; then these three raw materials are mixed into composite sulphoaluminate cement, and the The composite sulphoaluminate cement is used as a gelling agent to cement crop straws to make a composite straw board.

[0036] The above three raw materials that need to be explained are all purchased from the market, and their grinding fineness and specific surface area are above 400㎡ / kg.

[0037] Preparation of composite sulphoaluminate cement (weight percentage measurement):

[0038] Add 60% of common sulphoalumina...

Embodiment 1

[0042] (1) Separation (by weight): 60% of composite sulphoaluminate cement, 40% of dry basis rice straw, and 50% of water on a dry basis.

[0043] (2) Put metered water into the mixer first, start stirring, add metered composite sulphoaluminate cement, and stir for 1 to 2 minutes without stopping the machine;

[0044] (3) Add metered straw to the cement slurry while stirring continuously, and continue stirring for 10-13 minutes.

[0045] (4) Visually observe that the mixing system is uniform, soft, and meets the required plasticity state, and the material is discharged under stirring.

[0046] (5) Open the discharge valve, discharge the material into the mold of the channel guide plate forming machine, and automatically type it into the design specification, or use the robot to import the shaped steel wire mesh or the fixed-sized glass fiber mesh into the command part of the mixing body. The board is finished.

[0047] (6) Put it into the mold and form it without vibration. ...

Embodiment 2

[0050] Compared with Example 1, the difference is: 65% of composite sulphoaluminate cement, 35% of rapeseed straw on a dry basis, and 45% of water in the total dry basis of the formula. (operation steps are the same as in Example 1)

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Abstract

The invention discloses a preparation method of a composite straw sheet. The method includes: increasing the content of sulphate aluminium cement clinker into common sulphate aluminium cement, adding hydraulic calcium oxide as an exciting agent, and conducting blending to form compound sulphoaluminate cement, and bonding the cement with crop straw to obtain the sheet. And the side effects of straw on cement setting and hardening can be overcome. In the method, the straw is not soaked by alkaline water, a chlorine-containing material is unnecessary for modification treatment on straw, wastewater discharge does not exist, heating is not needed, smoke dust and exhaust emission are absent. The advantages of light weight and abundant fiber of crop straw are utilized for low energy consumption and pollution-free preparation of the composite straw sheet.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a composite straw cement plate prepared by using composite sulphoaluminate cement as a gelling agent and bonding crop straws with the cement in a normal temperature and pressure environment. Background technique [0002] Aiming at the coagulation of soluble carbohydrates in crop straws, especially sugars, to "hydraulic" cement, hardening is a fatal hazard and a problem that has not been solved so far, so it has been limited to use "air-hardening" magnesia cement to add Chlorine salt curing cement limited straw to make wallboard. Its products are deformed, afraid of water, strength regression, moisture absorption, returning halogen to corrode metal objects, which is not good for the environment. [0003] In addition, the Chinese patent announcement number is CN102887691A, and the announcement date is 2013.1.13, which discloses a new type of lightweight wall ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B18/24
CPCY02W30/91
Inventor 张凤阳
Owner 四川什邡国正环保科技有限公司
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