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A kind of preparation method of composite fiber cement board

A composite fiber and cement board technology, applied in the field of building materials, can solve problems such as poor mechanical properties of cement boards, and achieve the effects of maintaining mechanical properties, avoiding erosion, and improving chemical stability.

Active Publication Date: 2020-07-31
赣州大业金属纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: Aiming at the problem of poor mechanical properties of traditional cement boards, a preparation method of composite fiber cement boards is provided

Method used

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  • A kind of preparation method of composite fiber cement board

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example 1

[0021]In parts by weight, 50 parts of microcrystalline cellulose are taken successively, 300 parts of mass fraction are 20% sodium hydroxide solution, 150 parts of mass fraction are 20% urea solution, first the urea solution is moved into the refrigerator, and Cool to 0°C to obtain a pre-cooled urea solution, then mix microcrystalline cellulose and sodium hydroxide solution into a three-necked flask, and cool to 0°C, then add the pre-cooled urea solution to the three-necked flask, and use a stirrer to After stirring and mixing at 1200r / min for 60min, transfer the materials in the three-neck flask to a centrifuge, and centrifuge at a speed of 10000r / min for 20min, then remove the sediment in the lower layer to obtain a microcrystalline cellulose solution; 150 parts of microcrystalline cellulose solution, 8 parts of etherification agent, 0.6 part of urease, 40 parts of calcium nitrate solution with a mass fraction of 10%, first add microcrystalline cellulose to a four-necked flas...

example 2

[0023] In parts by weight, 50 parts of microcrystalline cellulose are taken successively, 300 parts of mass fraction are 20% sodium hydroxide solution, 150 parts of mass fraction are 20% urea solution, first the urea solution is moved into the refrigerator, and Cool to 0°C to obtain a pre-cooled urea solution, then mix microcrystalline cellulose and sodium hydroxide solution into a three-necked flask, and cool to 0°C, then add the pre-cooled urea solution to the three-necked flask, and use a stirrer to After stirring and mixing at 1200r / min for 60min, transfer the materials in the three-neck flask to a centrifuge, and centrifuge at a speed of 10000r / min for 20min, then remove the sediment in the lower layer to obtain a microcrystalline cellulose solution; 150 parts of microcrystalline cellulose solution, 8 parts of etherification agent, 40 parts of calcium nitrate solution with a mass fraction of 10%, first add microcrystalline cellulose to a four-necked flask with a stirrer, a...

example 3

[0025] In parts by weight, 50 parts of microcrystalline cellulose are taken successively, 300 parts of mass fraction are 20% sodium hydroxide solution, 150 parts of mass fraction are 20% urea solution, first the urea solution is moved into the refrigerator, and Cool to 0°C to obtain a pre-cooled urea solution, then mix microcrystalline cellulose and sodium hydroxide solution into a three-necked flask, and cool to 0°C, then add the pre-cooled urea solution to the three-necked flask, and use a stirrer to After stirring and mixing at 1200r / min for 60min, transfer the materials in the three-neck flask to a centrifuge, and centrifuge at a speed of 10000r / min for 20min, then remove the sediment in the lower layer to obtain a microcrystalline cellulose solution; 150 parts of microcrystalline cellulose solution, 8 parts of etherification agent, 0.6 part of urease, 40 parts of calcium nitrate solution with a mass fraction of 10%, first add microcrystalline cellulose to a four-necked fla...

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Abstract

The invention discloses a production method of a composite fiber cement board, and belongs to the technical field of building materials. The production method comprises the following steps: mixing microcrystalline cellulose with a sodium hydroxide solution, cooling the obtained solution, adding a precooled urea solution, stirring and mixing the obtained solution, centrifuging the obtained solutionto obtain a microcrystalline cellulose solution, dropwise adding an etherifying agent to the microcrystalline cellulose solution, performing constant-temperature stirring and reacting, cooling the obtained solution, adding urease and a calcium nitrate solution, continuing a reaction, concentrating the obtained reaction solution, drying the concentrated reaction solution to obtain etherified microcrystalline cellulose, performing a constant-temperature and constant-pressure reaction on the etherified microcrystalline cellulose and a sodium methoxide solution, cooling the obtained reaction solution, adding chloromethane, performing a constant-temperature and constant-pressure reaction, carrying out reduced pressure concentrating, drying the obtained concentrate to obtain modified microcrystalline cellulose, mixing cement, the modified microcrystalline cellulose, a water reducer and a defoamer, carrying out injection molding, and curing the molded mixture to obtain the composite fiber cement board. The composite fiber cement board obtained in the invention has excellent mechanical properties.

Description

technical field [0001] The invention discloses a preparation method of a composite fiber cement board, which belongs to the technical field of building materials. Background technique [0002] Fiber cement board refers to the board made of cement as the basic material and adhesive, mineral fiber cement and other fibers as reinforcing materials, and made through pulping, molding, curing and other processes. Fiber cement board is used in various power plants Fire-retardant and flame-retardant for cable projects in places with intensive electricity charges such as chemical companies and chemical companies. It is also the best fire-resistant and flame-retardant material for interior decoration fire-resistant and flame-retardant projects in large shopping malls, hotels, guesthouses, document halls, closed clothing markets, light industry markets, theaters and other public places. [0003] Fiber cement board, also known as fiber reinforced cement board, is a cement board for cons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/38C08B15/02
CPCC04B24/383C04B28/04C04B2201/50C08B15/02C04B2103/302C04B2103/50
Inventor 杨帮燕许玉张烨
Owner 赣州大业金属纤维有限公司
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