Asbestos-free straw fiber reinforced cement board and preparation method thereof

A technology of straw fiber and cement board, which is applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of reduced wood output, lack of wood resources, shortage and other problems, and achieve good water retention and adsorption, uniform fiber dispersion, and broom rate. high effect

Inactive Publication Date: 2020-06-02
郑州知淘信息科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, my country's timber resources are relatively scarce and in short supply. Since the forest coverage rate is not high, in order to protect the tree resources in forest areas and maintain a good ecological environment, commercial logging is gradually prohibited, resulting in a significant reduction in my country's timber production. The competition among downstream industries as raw materials is fierce, so manufacturers of fiber cement boards that use wood pulp fibers as reinforcing materials mainly rely on imported wood pulp, which is expensive in price and transportation, which limits the industrial development and application of green and environmentally friendly fiber reinforced cement boards

Method used

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  • Asbestos-free straw fiber reinforced cement board and preparation method thereof
  • Asbestos-free straw fiber reinforced cement board and preparation method thereof

Examples

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Embodiment 1

[0039] The non-asbestos straw fiber reinforced cement board of this embodiment is mainly made of the following raw materials in parts by weight:

[0040] 6.5 parts of modified wheat straw fiber, 5.5 parts of silica fume, 52 parts of cement, 10 parts of metakaolin, 21 parts of quartz sand, and 5 parts of fly ash.

[0041] The preparation method of the non-asbestos straw fiber reinforced cement board of the present embodiment comprises the following steps:

[0042] 1) Cut the dry wheat straw into short pieces with a length of 20-40 mm, soak them in water for 12 hours at room temperature to soften them, take them out and drain them until the dripping water no longer flows down in strands, to obtain the preparation material;

[0043] 2) Place the preparatory material obtained in step 1) in a steam explosion device for steam explosion. The steam temperature is 175° C., the explosion pressure is 2.8 MPa, the pressure holding time is 4.5 minutes, and then the pressure is released to ...

Embodiment 2

[0049] The non-asbestos straw fiber reinforced cement board of this embodiment is mainly made of the following raw materials in parts by weight:

[0050] 7 parts of modified wheat straw fiber, 6 parts of silica fume, 50 parts of cement, 11 parts of metakaolin, 20 parts of quartz sand, and 6 parts of fly ash.

[0051] The preparation method of the non-asbestos straw fiber reinforced cement board of the present embodiment comprises the following steps:

[0052] 1) Cut the dry wheat straw into a short material with a length of 20-40 mm, soak it in clean water for 14 hours at room temperature to soften it, take it out and drain until the dripping water no longer flows down in strands, and obtain the prepared material;

[0053] 2) Place the preparatory material obtained in step 1) in a steam explosion device for steam explosion. The steam temperature is 180° C., the explosion pressure is 2.4 MPa, the pressure holding time is 5.0 min, and the pressure is released to obtain the explo...

Embodiment 3

[0059] The non-asbestos straw fiber reinforced cement board of this embodiment is mainly made of the following raw materials in parts by weight:

[0060] 7.5 parts of modified wheat straw fiber, 5 parts of silica fume, 48 parts of cement, 12 parts of metakaolin, 22 parts of quartz sand, and 5.5 parts of fly ash.

[0061] The preparation method of the non-asbestos straw fiber reinforced cement board of the present embodiment comprises the following steps:

[0062] 1) Cut the dry wheat straw into short pieces with a length of 20-40mm. Under room temperature, first soak it in water for 16 hours to soften it, then soak it in a sodium hydroxide solution with a mass concentration of 3.0% for 20 minutes, take it out and drain until no water drips. Then it flows down in streams, and the material has to be prepared;

[0063] 2) Put the prepared material obtained in step 1) into a steam explosion device for steam explosion, the steam temperature is 180°C, the explosion pressure is 2.6M...

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Abstract

The invention relates to an asbestos-free straw fiber reinforced cement board and a preparation method thereof. The straw fiber reinforced cement board is mainly prepared from, by weight, 6-8 parts ofmodified wheat straw fibers, 5-6 parts of silica fume, 48-52 parts of cement, 10-12 parts of metakaolin, 20-22 parts of quartz sands and 5-6 parts of fly ash. A preparation technology of the modifiedwheat straw fibers comprises the following steps: 1) cutting dry wheat straws into a short material, and soaking and softening with water to obtain a prepared material; 2) performing steam explosionon the prepared material to obtain an exploded material; 3) sequentially carrying out alkaline leaching and water washing on the exploded material to obtain a fiber material; and 4) modifying the fiber material with gamma-aminopropyltriethoxysilane to obtain the asbestos-free straw fiber reinforced cement board. The asbestos-free straw fiber reinforced cement board is good in appearance quality, low in water absorption and wet expansion rate, good in water resistance and moisture resistance, high in mechanical properties, resistant to freeze thawing and hot water, good in dry-wet cycle performance, stable in properties, green and environmentally friendly, and can replace a wood pulp fiber reinforced cement board.

Description

technical field [0001] The invention belongs to the technical field of fiber-reinforced cement boards, and in particular relates to an asbestos-free straw fiber-reinforced cement board and a preparation method thereof. Background technique [0002] Fiber-reinforced cement board (also known as fiber cement board) is a water-hardening artificial board made of hardened cement paste or mortar as the base material and fiber as the reinforcing material through pulping, molding, curing, drying and other processes. ; According to the different types of reinforcing fibers used, it can be divided into chrysotile fiber cement boards reinforced with asbestos fibers and non-asbestos fiber cement boards reinforced with other fibers (without asbestos). [0003] Fiber-reinforced cement board has excellent characteristics such as fire insulation, waterproof and moisture-proof, heat insulation and sound insulation, light weight and high strength, simple construction, good decorative effect, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/02B28B1/52B28B11/24C04B111/76C04B111/27C04B111/28
CPCB28B1/525B28B11/243B28B11/245C04B20/023C04B28/00C04B2111/27C04B2111/28C04B2111/76C04B2201/50C04B18/248C04B18/146C04B14/106C04B14/06C04B18/08
Inventor 吕春粉
Owner 郑州知淘信息科技有限责任公司
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