CN102372465B - Wood modified fiber reinforced cement external wallboard and manufacturing process thereof - Google Patents
Wood modified fiber reinforced cement external wallboard and manufacturing process thereof Download PDFInfo
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- CN102372465B CN102372465B CN 201010253872 CN201010253872A CN102372465B CN 102372465 B CN102372465 B CN 102372465B CN 201010253872 CN201010253872 CN 201010253872 CN 201010253872 A CN201010253872 A CN 201010253872A CN 102372465 B CN102372465 B CN 102372465B
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Abstract
The present invention discloses a wood modified fiber reinforced cement external wallboard. The wood modified fiber reinforced cement external wallboard comprises the following components: 60-100 parts of cement, 10-20 parts of calcium powder, 10-30 parts of silicon powder, 2-10 parts of expanded perlite, 0.2-4 parts of modified wood fiber, 0-1.5 parts of polypropylene fiber, 20-40 parts of second class fly ash, 0.2-0.4 parts of methylcellulose, 0-8 parts of paper pulp, 0-6 parts of an initial set agent, 2-10 parts of gypsum whisker and 0.2-8 parts of flake mica. The present invention further discloses a manufacturing process for the wood modified fiber reinforced cement external wallboard. According to the present invention, the modified wood fiber is added to the components, such that the use amount of the methylcellulose (MC) is substantially reduced.
Description
Technical field
The present invention relates to a kind of fibrocement Side fascia and production technique thereof.
Background technology
Along with the modernization of the flourish of construction industry and building, the usage quantity of Side fascia just rolls up in the construction work.At present, in existing Side fascia, the especially raw materials for production of cement Side fascia, cement strengthens with the filamentary material multiselect with polypropylene fibre (PP), asbestos etc., though PP and cement matrix good dispersion are on the high side, and asbestos are objectionable impuritiess, can not embody environmental requirement; Plastic agent material multiselect is with expensive methylcellulose gum (MC), and in 100 parts of cement, add the MC amount up to more than 2.0 parts, therefore existing cement Side fascia is made raw material and has been caused the expensive of finished product, and, bring certain difficulty to construction up to the unit weight more than the 1.6g/cm3.And, also exist technological problemses such as wet trade, labour intensity be big in the operation of existing exterior wall form.The facing of very few in addition exterior wall substrate forms, dullness also is no small sorry to today of pursuing individuality building.
In addition, in fibrocement Side fascia production process,, need to increase the prescription water consumption in order to reduce product density.Along with the increase of prescription water consumption, the hygroexpansivity of product also increases thereupon.When the prescription water consumption surpasses 50%, the hygroexpansivity of product will meet or exceed 0.25%, obviously reduce the volume stability and the work-ing life of product.
In addition, the fibrocement Side fascia needs to carry out atmospheric steam curing in the process of producing, and makes product have certain initial strength and guarantees finishing of subsequent production operation.When the prescription water consumption of fibrocement Side fascia surpasses 40%, use existing maintenance process, cause product not have problems such as intensity, easy bubble easily.
In addition, the fibrocement Side fascia needs painted, present processing normally to handle by pigment coloration in the process of producing, because coating belongs to organism, its weather resistance is relatively poor, and problem that top coat wear out, fade and peel off easily occur once long Side fascia duration of service.And be 50 years the work-ing life of fibrocement Side fascia, and the life-span of common coating only is 8-10, and also super only 20 years of the work-ing life of high-grade paint is in the work-ing life of fibrocement Side fascia, at least need 3-5 repairing application, caused later maintenance cost too high.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of manufacturing process of wooden modified fibre refinforced cement Side fascia, and the consumption that can make MC is less than 0.5%, and makes production cost to reduce greatly.
In order to address the above problem, the invention provides a kind of wooden modified fibre refinforced cement Side fascia and comprise following component: 60～100 parts of cement, 10～20 parts of calcium powders, 10～30 parts of silica flours, 2～10 parts of pearlstones, 0.2～4 part of modification wood fibre, 0～1.5 part of polypropylene fibre, 20～40 parts of second class powered coal ashes, 0.1～0.4 part of methylcellulose gum, 0～8 part of paper pulp, initial set agent are 2～10 parts of 0～6 parts, crystal whisker of gypsum, 0.2～8 part of sheet mica.
Preferably, described modification wood fibre obtains by the following method: xylon by the low-pressure steam explosion treatment, is about to xylon and places 150～170 ℃, the water vapor pressure force container of 1～2.5MPa, drop to normal pressure in 3-4 internal pressure second then.
Preferably, again at the described surface spraying last layer silane coupling agent that passes through the modification wood fibre of low-pressure steam explosion treatment.
Preferably, described component also comprises 0.2～8 part sheet mineral material, and this sheet mineral material is a mica.
Preferably, described micaceous granularity is 40～80 orders.
Preferably, described component also comprises 2～10 parts crystal whisker of gypsum.
The present invention also provides a kind of manufacturing process of wooden modified fibre refinforced cement Side fascia, and this technology is: various raw materials are prepared burden in described ratio, then admixtion is stirred in stirrer; Again stirred materials is mediated in kneader, evenly spray moisture simultaneously; Material after mediating carries out maintenance by extruder for shaping after pressing steaming to handle.
Preferably, described maintenance comprises the steps:
1) after the extrusion moulding of fibrocement Side fascia, under 20-30 ℃, the fibrocement Side fascia carried out 10-20 hour low-temperature steam maintenance operating, maintenance humidity is controlled at 60-80%, treats in the fibrocement Side fascia to enter next maintenance stage again after the cement final set;
2) carry out 5～15 hours high temperature steam curing under 60～90 ℃, maintenance humidity is controlled at 70-90%, to avoid the excessive fibrocement Side fascia saturated intensity that influences that absorbs water that causes of humidity.
Preferably, comprise that also entire body shows signs of anger, i.e. the deployed mineral dye of admixture in the starting material powder of producd fibers cement Side fascia, and allow it be adsorbed on other particle surface by high-speed stirring, thus reach abundant dispersive purpose, and then add water and stir.
The present invention has following advantage:
1) by in component, adding wood fibre, not only can make the consumption of methylcellulose gum (MC) reduce greatly, reduce cost, improve tensile strength, enhancing sheet material dimensional stability advantage but also have significantly through modification.
2) the present invention is by in producd fibers cement Side fascia process, when the prescription water consumption greater than 50% the time, in starting material, add sheet mineral material (the preferred mica that adopts among the present invention), thereby the hygral expansion of product can be reduced to below 0.17%, and the hygroexpansivity of traditional product is normally more than 0.25%;
3), to substitute traditional glass fibre, not only make the fracture load by bending of Side fascia improve more than 50%, and shock resistance, anti-shearing and splitting resistance improve at least 10% by in component, adding crystal whisker of gypsum;
4) the present invention carries out vapor cure by the mode that low-temperature steam maintenance operating and high temperature steam curing combine to the fibrocement Side fascia, thereby makes product have higher initial strength, and product is not easy to produce bubble, has improved quality product and production efficiency;
5) the present invention adopts and produces targetedly and maintaining process by mineral dye being joined in the fibrocement Side fascia, makes that fibrocement Side fascia entire body is of the same colour, and lovely luster is elegant in appearance, and it is colour-fast to stand high temperature.Because of it is that entire body is painted, and be inorganic materials, the whole work-ing life of the sustainable product of its color.The problem of application is lacked, easily worn out, fades, peels off and need repeatedly repair to the Side fascia top coat life-span that has solved traditional use pigment coloration.
Embodiment
Embodiment 1
(1) batch mixes: be that old and useless newspaper behind the ordinary Portland cement, silica flour, calcium powder, dispersion of P.O.42.5 is that paper pulp, pearlstone, modification wood fibre, methylcellulose gum (MC), initial set agent, crystal whisker of gypsum and mica place stirrer for mixing 10min with label, temperature in the stirrer is controlled at below 50 ℃, and the micaceous granularity is controlled at 40～80 orders;
The formula constituent of raw material (by weight) is:
Cement: 100 parts, silica flour: 20 parts, calcium powder: 15 parts, pearlstone: 5 parts, modification matter xylon: 4 parts, MC:0.4 part, paper pulp: 4 parts, initial set agent: 3 parts, crystal whisker of gypsum: 10 parts, mica: 8 parts.
(2) mediate: place kneader to mediate 15min mixed material, evenly spray moisture simultaneously, water consumption is 46 parts.
(3) extrusion moulding: kneaded material is passed through extruder for shaping, (maximum cross dimensions 340mm * 16mm, length can be cut arbitrarily), and extrusion pressure is not less than 2Mpa, and the extrusion moulding extruded velocity is not more than 6m/min.
(4) maintenance:
At first, after the extrusion moulding of fibrocement Side fascia, the fibrocement Side fascia carried out 10-20 hour low-temperature steam maintenance operating under 20-30 ℃, maintenance humidity is controlled at 60-80%, treats in the fibrocement Side fascia to enter next maintenance stage again after the cement final set;
2) carry out 5-15 hour high temperature steam curing under 60-90 ℃, maintenance humidity is controlled at 70-90%, to avoid the excessive fibrocement Side fascia saturated intensity that influences that absorbs water that causes of humidity.
By the mode that above-mentioned low-temperature steam maintenance operating and high temperature steam curing combine the fibrocement Side fascia is carried out vapor cure, thereby make product have higher initial strength, and product is not easy to produce bubble, improved quality product and production efficiency.
If adopt existing maintaining process, when the prescription water consumption of fibrocement Side fascia surpassed 40%, product did not have intensity in 24 hours, generally needed just to have certain intensity in 48-72 hour.And after adopting this maintaining process, product promptly had good intensity in 24 hours, had greatly improved production efficiency.Simultaneously, existing maintenance causes the product surface suction saturated easily, when follow-up autoclave curing, and the surface-moisture gasification, thus produce bubble.The incidence of general bubble is more than 50%, use this maintaining process after, the incidence of open bubble is below 0.5%.
In addition, the entire body coloring process specifically comprises following processing step:
At first, the deployed mineral dye of admixture in the starting material powder of producd fibers cement Side fascia, and allow it be adsorbed on the powder particle surface by high-speed stirring makes the abundant dispersive purpose of mineral dye thereby reach, and then adds water and stir.In the present embodiment, mineral dye can the selective oxidation iron oxide red.
In addition, the concrete preparation process of above-mentioned modification wood fibre is as follows:
After xylon adopted the low-pressure steam explosion, recycle silicon alkane coupling agent was handled with spray pattern, obtain excellent property, can with the modification wood fibre of ceramic good combination such as cement.
The low-pressure steam explosion:
Utilize the low-pressure steam explosion, can handle, to reach the purpose of improving fibre property xylon.The natural macromolecular material that xylon is made up of Mierocrystalline cellulose, hemicellulose, xylogen and extract etc. is a kind of uneven anisotropic material, and interfacial characteristics is very complicated.
In the steam explosion process, plant fiber material is in 150～170 ℃, the water vapor pressure force container of 1～2.5MPa, fiber is by liquid institute swollen, be full of steam in the hole, when the pressure steam sudden pressure reduction, gas in the hole sharply expands, and the part lignin is peeled off, and raw material is dissociated into fiber fines.Simultaneously, hemicellulose, Mierocrystalline cellulose partial hydrolysis become soluble saccharide, and xylogen is softened, and transverse strength weakens, and be soft plastic.The fiber separation that explosion causes mainly occurs in middle lamella, and itself is not almost decreased fiber.Because most indefinite kenel material hemicellulose has been removed in the low-pressure steam explosion, resulting fiber has stability preferably, can be as the fortifying fibre of cement-based material.
The low-pressure steam blasting process be wood fiber raw material at hot mastication, slacken under the prerequisite of concluding between Mierocrystalline cellulose, the rapid expansion effect of water vapor causes the moment of lignocellulose to transform when reducing pressure suddenly, vapour detonation pressure power has bigger influence to the quick-fried effect of vapour.Along with the increasing of vapour detonation pressure power, the hemicellulose transforming degree is bigger; Mierocrystalline cellulose is along with to a certain degree conversion also takes place in the increase of pressure, but transformation efficiency is not very high; And this high molecular polymer generation depolymerization of xylogen acquires a certain degree of difficulty.
The spraying of silane coupling agent:
Silane coupling agent is a kind of silicoorganic compound with special construction.In its molecule, have simultaneously can with inorganic materials (as glass, cement, metal etc.) bonded reactive group and with organic materials (as synthetic resins etc.) bonded reactive group.Usually, have only 1 and substrate surface bonding in 3 silicon hydroxyls that the silane coupling agent hydrolysis generates on the interface; 2 remaining si-OH, or with other silane in the si-OH condensation, or be unbound state.Therefore, can make 2 kinds of material interface couplings that performance difference is very big, thereby improve performance of composites and increase cohesive strength by silane coupling agent, and obtained performance excellence, advanced composite material reliably.
By silane coupling agent is atomized, and be sprayed onto the wooden fiber surface of modification, the modification wood fibre can be carried out physics coats, thereby organic wood fibre is reached and the combining closely of inorganic polymer, and intensity, cohesive force, electrical property, hydrophobicity, ageing resistance that makes material etc. significantly improves.
Silane coupling agent has 2 kinds of groups of different nature, and close inorganics group can react with the chemical group of inorganics surface (as materials such as glass, flyash), forms strong chemical bonding; Parent's organism group can twine with organic molecule reaction or physics, thereby makes organic interface with inorganic materials realize chemical bonding, increases substantially bonding strength.
Embodiment 2
The formula constituent of raw material (by weight) is:
Cement: 60 parts, silica flour: 10 parts, calcium powder: 10 parts, pearlstone: 5 parts, modification matter xylon: 0.2 part, MC:0.2 part, paper pulp: 4 parts, initial set agent: 3 parts, crystal whisker of gypsum: 2 parts, mica: 0.2 part.
Other preparation process is with embodiment 1.
Embodiment 3
The formula constituent of raw material (by weight) is:
Cement: 80 parts, silica flour: 30 parts, calcium powder: 20 parts, pearlstone: 5 parts, modification matter xylon: 2 parts, MC:0.3 part, paper pulp: 4 parts, initial set agent: 3 parts, crystal whisker of gypsum: 6 parts, mica: 4 parts.
Other preparation process is with embodiment 1.
Table one adds the micaceous effect
| 0.2 | 0.17％ | 0.25％ |
| 4 | 0.12％ | 0.25％ |
| 8 | 0.08％ | 0.25％ |
Table two adds the effect of modification wood fibre
Table three adds the effect of crystal whisker of gypsum
In sum; being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention, therefore; all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. wooden modified fibre refinforced cement Side fascia, it is characterized in that, comprise following component: 60～100 parts of cement, 10～20 parts of calcium powders, 10～30 parts of silica flours, 2～10 parts of pearlstones, 0.2～4 part of modification wood fibre, 0～1.5 part of polypropylene fibre, 20～40 parts of second class powered coal ashes, 0.2～0.4 part of methylcellulose gum, 0～8 part of paper pulp, initial set agent are that 0～6 part, 2～10 parts of crystal whisker of gypsum, granularity are 0.2～8 part of 40～80 purpose sheet mica; Wherein said modification wood fibre obtains by the following method: xylon by the low-pressure steam explosion treatment, is about to xylon and places 150～170 ℃, the water vapor pressure force container of 1～2.5MPa, drop to normal pressure in 3-4 internal pressure second then; Again at the described surface spraying last layer silane coupling agent that passes through the modification wood fibre of low-pressure steam explosion treatment.
2. technology of making wooden modified fibre refinforced cement Side fascia as claimed in claim 1, this technology is: various raw materials are prepared burden in described ratio, then admixtion is stirred in stirrer; Again stirred materials is mediated in kneader, evenly spray moisture simultaneously; Material after mediating carries out maintenance by extruder for shaping after pressing steaming to handle.
3. technology as claimed in claim 2 is characterized in that described maintenance comprises the steps:
1) after the extrusion moulding of fibrocement Side fascia, under 20-30 ℃, the fibrocement Side fascia carried out 10-20 hour low-temperature steam maintenance operating, maintenance humidity is controlled at 60-80%, treats in the fibrocement Side fascia to enter next maintenance stage again after the cement final set;
2) carry out 5～15 hours high temperature steam curing under 60～90 ℃, maintenance humidity is controlled at 70-90%, to avoid the excessive fibrocement Side fascia saturated intensity that influences that absorbs water that causes of humidity.
4. technology as claimed in claim 3, it is characterized in that, comprise that also entire body shows signs of anger, the i.e. deployed mineral dye of admixture in the starting material powder of producd fibers cement Side fascia, and allow it be adsorbed on other particle surface by high-speed stirring, thereby reach abundant dispersive purpose, and then add the water stirring.
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| CN 201010253872 CN102372465B (en) | 2010-08-13 | 2010-08-13 | Wood modified fiber reinforced cement external wallboard and manufacturing process thereof |
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| CN 201010253872 CN102372465B (en) | 2010-08-13 | 2010-08-13 | Wood modified fiber reinforced cement external wallboard and manufacturing process thereof |
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| CN114800832A (en) * | 2022-04-14 | 2022-07-29 | 万象宸和(福建)新材料科技有限公司 | Cement fiber wallboard production line and processing technology thereof |
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