Preparation and formula of high-strength, high-toughness and low-density wood fiber calcium silicate board

Abstract

The invention discloses preparation and a formula of a high-strength, high-toughness and low-density wood fiber calcium silicate board. The board is low in density and high in breaking strength, especially the impact strength is greatly improved, and compared with a low-density calcium silicate board on the market at present, the breaking strength is generally about 8 Mpa, even 6 Mpa and 7 Mpa, the impact strength is lower, and no requirement is made. More than 50% of paper pulp is replaced by the wood fibers, perlite, diatomite and the like are not used, the cost is greatly reduced, steam isrecycled, perlite calcined at high energy consumption is not used, and energy conservation and emission reduction are achieved; the water absorption rate of the board is greatly reduced, and lithium silicate and potassium silicate are generated on the fiber surface in the board, so that the bonding capacity is improved, and the waterproof effect is achieved.

Description

technical field

[0001] The invention relates to the field of building materials, in particular to the preparation and formulation of high-strength, high-toughness and low-density wood fiber calcium silicate boards. Background technique

[0002] The current low-density calcium silicate board has low strength. The dry flexural strength is generally around 8, and some are even 6.7Mpa. The cost is high. In order to reduce the density of ordinary low-density calcium silicate board, it is necessary to add light filler or Lightweight active materials, such as perlite, mica, diatomaceous earth, etc., are relatively expensive. The addition of light fillers such as perlite reduces the density, but at the same time the strength of the board also drops sharply, and the cost of the board is also greatly reduced. Increase. Although wood fiber is used to produce calcium silicate boards, the amount of addition is still small, and low-density, high-strength and high-toughness boards have no...

Examples

preparation example Construction

[0027] Preparation method of high-strength, high-toughness and low-density wood fiber calcium silicate board:

[0028] Step 1): Add 5000-9000L of lime water with a concentration of 0.1-0.3% in the dissolution tank, feed the steam discharged during the depressurization of the autoclave, and add wood fiber into the dissolution tank with a solid content of 8%-15%. Stir for 1-2 hours and let it stand, release the upper layer of oil and part of the dissolved water, continue to feed the recovered steam, and pass through 3-4 cycles of stirring and feeding the recovered steam to obtain wood fibers that are initially decolorized and organic matter removed, and the concentration is 5- 10% wood fiber;

[0029] Step 2): The wood fiber after step 1) is passed through the first delivery pump to the storage tank to keep stirring and standby;

[0030] Step 3): Pass the part of the wood fiber treated in step 2) through a carding machine for carding treatment, and pass through the pulp of 23-3...

Embodiment 1

[0049]The calcium silicate board is made of the following raw materials by weight ratio, 0.77% wood fiber, 0.009% wood fiber activator calculated according to the quality of wood fiber, 0.8% pulp, 2.9% cement, 5.8% quartz powder, 1% lime, 0.08% wollastonite, 1% silica fume, 0.16% mineral fiber and 87.4% water.

Embodiment 2

[0051] The calcium silicate board is made of the following raw materials in weight ratio, 0.9% wood fiber, 0.01% wood fiber activator calculated according to the quality of wood fiber, 0.8% pulp, 2.6% cement, 5.3% quartz powder, 1% lime, 0.08% wollastonite, 1% silica fume, 0.1% mineral fiber and 88.2% water.

technical field

[0001] The invention relates to the field of building materials, in particular to the preparation and formulation of high-strength, high-toughness and low-density wood fiber calcium silicate boards. Background technique

[0002] The current low-density calcium silicate board has low strength. The dry flexural strength is generally around 8, and some are even 6.7Mpa. The cost is high. In order to reduce the density of ordinary low-density calcium silicate board, it is necessary to add light filler or Lightweight active materials, such as perlite, mica, diatomaceous earth, etc., are relatively expensive. The addition of light fillers such as perlite reduces the density, but at the same time the strength of the board also drops sharply, and the cost of the board is also greatly reduced. Increase. Although wood fiber is used to produce calcium silicate boards, the amount of addition is still small, and low-density, high-strength and high-toughness boards have no...

Examples

preparation example Construction

[0027] Preparation method of high-strength, high-toughness and low-density wood fiber calcium silicate board:

[0028] Step 1): Add 5000-9000L of lime water with a concentration of 0.1-0.3% in the dissolution tank, feed the steam discharged during the depressurization of the autoclave, and add wood fiber into the dissolution tank with a solid content of 8%-15%. Stir for 1-2 hours and let it stand, release the upper layer of oil and part of the dissolved water, continue to feed the recovered steam, and pass through 3-4 cycles of stirring and feeding the recovered steam to obtain wood fibers that are initially decolorized and organic matter removed, and the concentration is 5- 10% wood fiber;

[0029] Step 2): The wood fiber after step 1) is passed through the first delivery pump to the storage tank to keep stirring and standby;

[0030] Step 3): Pass the part of the wood fiber treated in step 2) through a carding machine for carding treatment, and pass through the pulp of 23-3...

Embodiment 1

[0049]The calcium silicate board is made of the following raw materials by weight ratio, 0.77% wood fiber, 0.009% wood fiber activator calculated according to the quality of wood fiber, 0.8% pulp, 2.9% cement, 5.8% quartz powder, 1% lime, 0.08% wollastonite, 1% silica fume, 0.16% mineral fiber and 87.4% water.

Embodiment 2

[0051] The calcium silicate board is made of the following raw materials in weight ratio, 0.9% wood fiber, 0.01% wood fiber activator calculated according to the quality of wood fiber, 0.8% pulp, 2.6% cement, 5.3% quartz powder, 1% lime, 0.08% wollastonite, 1% silica fume, 0.1% mineral fiber and 88.2% water.

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