CN1350993A - Light calcium silicate plate and its preparing process - Google Patents

Abstract

A light-weight calcium silicate plate is prepared from cellulose fibres (7-15 wt%), quartz sand (24-30), dihydrated gypsum (10-30), wallastonite (2-3), lime hydrate (4-8), mica (2-4) and cement (10-51) through preparing mortar, shaping, steam curing and baking. It has low specific weight (0.8-1 g/cu.cm).

Description

A kind of light calcium silicate plate and manufacture method thereof

The present invention relates to calcium silicate board and manufacture method thereof, be specifically related to a kind of light calcium silicate plate and manufacture method thereof.

Calcium silicate board be a kind of be main raw material with siliceous material, calcareous material and an amount of fortifying fibre, through slurrying, become base, steam-cured, material of construction that oven dry is made.In the prior art, calcareous material is selected slaked lime and ordinary Portland cement usually for use, and siliceous material is selected flyash, quartz sand or diatomite usually for use, and fortifying fibre adopts asbestos, and follows the example of or slurry flowing process becomes base, steam-cured making to copy.Because the SiO in the siliceous material ₂With CaO in the calcareous material mixing with water after steam press maintenance generation hydro-thermal is closed reaction, generate a kind of holder shellfish mullite crystal (TOBERMORITE), this crystal has very stable character, so make calcium silicate board show the low-shrinkage energy.Therefore characteristics such as intensity height, contract with dry rate are little because this material has, fire prevention, protection against the tide are widely used in the partition wall and the furred ceiling of all kinds of buildings, decoration, and become the regeneration product of traditional fibre cement plate.But owing to the cement in the raw material of calcium silicate board, flyash, quartz sand etc. all have larger specific gravity, make the proportion big (proportion is often between 1.3～1.6) of calcium silicate board, transportation cost height so not only, operating technique and auxiliary keel are required height, the more important thing is the integral body heavy burden that has increased buildings self.Therefore under the prerequisite that guarantees overall performance, how to reduce the problem that the proportion of calcium silicate board has just become many production firms and researchist extremely to be concerned about.

The object of the invention provides the manufacture method of the calcium silicate board that a kind of proportion is little, intensity is good and the calcium silicate board that makes with this method.

For achieving the above object, the technical solution used in the present invention is: a kind of manufacture method of light calcium silicate plate, contain following component and weight percent in the solid raw material prescription:

Cellulosic fibre 7-15%;

Quartz sand 24-30%;

Dihydrate gypsum 10-30%;

Wollastonite 2-3%;

Slaked lime 4-8%;

Mica 2-4%;

Cement 10-51%;

The starting material of above-mentioned prescription through slurrying, become base, steam-cured, oven dry to make finished product.

In the technique scheme, can contain glass 0-4% in the described solid raw material prescription.

For reaching above-mentioned another purpose, the technical solution used in the present invention is: according to the calcium silicate board that above-mentioned light calcium silicate plate manufacture method makes, proportion is at 0.8-1.0g/cm ³Scope.

The present invention utilizes the dihydrate gypsum that adding has the dehydration characteristics in the formula for raw stock, in the fashionable generation dehydration reaction of the hydro-thermal of manufacturing processed, thereby makes the less calcium silicate board of proportion.

Because the technique scheme utilization, the present invention compared with prior art has following advantage:

1, owing to contain dihydrate gypsum and corresponding content in the calcium silicate board solid raw material prescription of the present invention,, thereby makes proportion at 0.8-1.0g/cm in the fashionable generation dehydration reaction of the hydro-thermal of manufacturing processed with dehydration characteristics ³The calcium silicate board of scope.With existing proportion be 1.3g/cm ³Calcium silicate board compare the 23.1-38.5% that descended; With existing proportion be 1.6g/cm ³Calcium silicate board compare the 37.5-50% that descended.From the proportion fall, effect is fairly obvious and outstanding.

2, the present invention does not reduce other performance reducing calcium silicate board proportion simultaneously, and every physical indexs such as its outward appearance, intensity, toughness can reach and surpass national standard.Specifically referring to the detection data among the embodiment.

3, because the present invention has compared with prior art obtained proportion at 0.8-1.0g/cm ³The light calcium silicate plate of scope, its effect not only help reducing transportation of materials and construction cost, but also have alleviated the buildings heavy burden.

4, main points of the present invention are to contain dihydrate gypsum and the corresponding content with dehydration characteristics in the solid raw material prescription, can adopt the formula for raw stock of technique scheme, and finish by prior art processes, need not to change original common Calucium Silicate powder board assembly line and working condition like this, production process does not increase cost, still can obtain better effects.Use very favourable to product technology renewal and product promotion.

Below in conjunction with embodiment the present invention is further described:

Embodiment: a kind of manufacture method of light calcium silicate plate, contain following component and weight percent in the solid raw material prescription:

Cellulosic fibre 7-15% (Russia produces kraft paper wood pulp, beautiful 9# newspaper)

Glass 0-4%

(500 orders contain 95%SiO to quartz sand 24-30% ₂)

Dihydrate gypsum 10-30%

Wollastonite 2-3% (fibrous)

Slaked lime 4-8% (200 orders contain 67%CaO)

Mica 2-4% (100 order)

Cement 10-51% (common 525#)

Manufacturing process and production operation flow process (the existing technology of following the example of of copying):

1, batching slurrying: measure wood pulp and newspaper, loosen through pulping engine and make the cellulosic fibre slurry.Metering glass, dihydrate gypsum, quartz sand, wollastonite, slaked lime, mica and cement add the water uniform mixing in the input mixing hollander.Add a small amount of flocculation agent and defoamer.Pulp density 13-15%.

2, copy and get moulding: four net cages are copied and are got the machine moulding.Net cage diameter 1200mm, felt speed 45m/ branch, thin material thickness 0.4-0.5mm.Material base reaches system on the forming tube needs thickness to pull base, is delivered to blank cutter and cuts edge.Slab specification 1220 ^*2440 ^*5-10mm, stacker is stacked per 20 the place mat plates of slab, and 120 is a steam-cured dolly.

3, pre-hard: precompressed in the tunnel like curing kilns of logical steam, vapor pressure 0.1Mpa, 6 hours.

4, autoclave curing: work in-process enter the steam-cured steaming pressure pressure of autoclave 0.9Mpa, heat up 2.5 hours, and constant temperature time 11 hours was lowered the temperature 3 hours.

5, oven dry: separate with the eternit filler strip between every plate and leave the 8mm space, at the oven dry kiln drying.

6, sanding:, make finished product through the sanding of grinder front surface.

As stated above, when adopting following preferable composition of raw materials, the performance data of the light calcium silicate plate of production:

Composition of raw materials: unit K g

	Wood pulp	Newspaper	Glass	Quartz sand	Wollastonite	Slaked lime powder	Mica	Cement	Dihydrate gypsum
										Prescription 1	?35	?20		?120	?10	?25	?10	?100	?80
Prescription 2	?30	?30	?10	?110	?10	?20	?10	?120	?70

Detect data:

		Prescription 1	Prescription 2
				Folding strength Mpa	Laterally	15.43	?15.78
Vertically	12.17	?12.20
			Resistance to impact shock Kj/m 2		Laterally	2.17	?2.02
Vertically	1.54	?1.59
				Density g/cm 3		0.88	?0.92

Water ratio %	9.3	?9.3
			Water-intake rate %	32	?29.4
Bulking factor %	0.14	?0.15
			Contract with dry rate %	0.08	?0.09
Screw is transferred to power N/mm	62.7	?59.4
			Uninflammability	Not so A level	Do not fire the A level

As can be seen from the above table, more than two kinds add 20% and 17.1% dihydrate gypsum respectively and make raw material, density is respectively 0.88g/cm ³, 0.92g/cm ³, more common calcium silicate board 1.3g/cm ³Reduced approximately 30%, made the light-weight calcium silicate board.The use of the present invention's prescription need not to change original common Calucium Silicate powder board assembly line and working condition, does not influence cost, and the finished product appearance looks elegant, and the intensity height has toughness preferably, and every physicals reaches and surpasses national standard, is fit to large-scale production.

Claims (3)

1, a kind of manufacture method of light calcium silicate plate is characterized in that containing in the solid raw material prescription following component and weight percent:

Cellulosic fibre 7-15%;

Quartz sand 24-30%;

Dihydrate gypsum 10-30%;

Wollastonite 2-3%;

Slaked lime 4-8%;

Mica 2-4%;

Cement 10-51%;

The starting material of above-mentioned prescription through slurrying, become base, steam-cured, oven dry to make finished product.

2, method according to claim 1 is characterized in that: contain glass 0-4% in the described solid raw material prescription.

3, the light calcium silicate plate that makes according to claim 1 or 2 described methods, it is characterized in that: proportion is at 0.8-1.0g/cm ³Scope.