CN103790250A - Illite environment-friendly foaming acoustical board - Google Patents
Illite environment-friendly foaming acoustical board Download PDFInfo
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- CN103790250A CN103790250A CN201410039493.XA CN201410039493A CN103790250A CN 103790250 A CN103790250 A CN 103790250A CN 201410039493 A CN201410039493 A CN 201410039493A CN 103790250 A CN103790250 A CN 103790250A
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Abstract
The invention discloses an illite environment-friendly foaming acoustical board. According to the technical scheme, an internal frame is horizontally arranged on a mold, after a short steel pipe in the internal frame is inserted in an upright column, illite composite foaming gents are cast on the periphery of the internal frame, and after still standing and solidifying processing, roasting and cooling, a finished product of the illite foaming acoustical board is formed through package. The illite composite foaming gents are composed of illite, attapulgite pottery clay powder with an air purification function and hydrogen peroxide, after solidification, the illite composite foaming gents and the internal frame are integrated to be a whole, and after a half-finished product is roasted, the integrated strength, bending resistance and the actual using effect of the acoustical board are enhanced. The illite environment-friendly foaming acoustical board has the effects of enhancing sound absorption and controlling noise pollution, also has the functions of heat preservation, adsorption and air purification, and is suitable for motorways, viaducts, subways, factories, public places and other places.
Description
Technical field
The present invention relates to abatvoix, be specifically related to a kind of illite environment-friendly foaming abatvoix.
Background technology
City noise is having a strong impact on townsfolk's normal life and health of human body, city noise mainly refers to traffic noise, factory noise, construction noise pollution and noise of social activities, the influence basin of its noise and influence degree are day by day serious, on the impact of civic living environment greatly, become one of noticeable city environmental pollution problem.
Conventionally adopt damping material to produce the products such as some abatvoixs, noise barrier, sound-absorbing net and noise damper and control noise pollution, also having some damping materials is to produce the products such as abatvoix after processing by foaming, to improve the performance of product.
Abatvoix quality after sale foaming is in the market more crisp, and the bulk strength of abatvoix, counter-bending ability and result of use are undesirable; Be installed in the process on building wall at abatvoix, abatvoix needs on-the-spot 4 the above bolts hole that bore, not only time-consuming, increase difficulty of construction, and be easy to abatvoix be broken or shatter in when boring, after abatvoix is arranged on building wall, due to the effect of gravity, can cause the abatvoix fragmentation from building wall after boring to come off.
Summary of the invention
The object of the invention is to overcome weak point in prior art, a kind of illite environment-friendly foaming abatvoix is provided.
Illite environment-friendly foaming abatvoix is made up of illite compound foaming agent and built-in frame, built-in frame is lain on mould, after short steel pipes in built-in frame inserts column, adopt illite compound foaming agent to be cast in built-in frame periphery, built-in frame is embedded in the inside of illite compound foaming agent completely, through leaving standstill solidify processing, roasting and cooling after, be packaged as illite environment-friendly foaming abatvoix finished product.
Illite is common a kind of clay mineral, is often formed by muscovite, potassic feldspar weathering, and originates in argillaceous rocks, or formed by other mineral alterations.Illite has rich potassium, high alumina, low iron and superior chemistry, the physical property such as smooth, bright, fine and smooth, heat-resisting.
The concave convex rod potter's clay powder with air purification function is made up of the sticky Concave-convex clay rod of height, attapulite constant humidity amendment, natural-minerals adsorptive filter medium, cacumen biotae, aluminium silicate fiber peacekeeping polyacrylamide; there is good caking property, plasticity, thixotropy, refractoriness and heat stability; the effectively hazardous substances such as formaldehyde, ammonia and benzene in absorbed air, protection of the environment and promote the healthy of people.
Attapulgite has another name called palygorskite or Palygorskite, be a kind of layer of chain structure containing Shuifu County's zeopan clay mineral, attapulgite has unique layer chain structure feature, in its structure, has crystal lattice, therefore contain the Na of non-quantitative in crystal
+, Ca
2+, Fe
3+, Al
3+, crystal is needle-like, fibrous or fiber collection shape.Attapulgite has unique dispersion, high temperature resistant, the anti-good colloidal nature such as saline and alkaline and higher adsorption capacity, and has certain plasticity and adhesion stress.
Hydrogen peroxide is commonly called as hydrogen peroxide, and outward appearance is colourless transparent liquid, is a kind of strong oxidizer, and the present invention selects mass fraction >=35% of industrial hydrogen peroxide, after mixing, can generate a large amount of bubbles with the concave convex rod potter's clay powder with air purification function.
DDAO is a kind of amphoteric surfactant, colourless transparent liquid, for weak cation surfactant, in acid medium, be cationic, in alkaline medium, be nonionic, have good thickening, antistatic, soft, foam enhancing and detergency ability, foam is abundant and stablize, the gentle excitant of character is low, has good antistatic behaviour and flexibility.
Cocounut oil acyl diethanol amine is water-soluble, has good decontamination, emulsification, foaming, steady bubble, dispersion, solubilising power.
Silicones polyethers emulsion is a kind of novel high polymer foam stabilizer, put in order by changing intramolecule, make to arrange between surfactant bubble and bubble closely neat, thereby form fine and close inner layer film, make anti-pressure ability strong especially, can control the structural stability of air bubble liquid-membrane, make the liquid film Methodistic distribution of surfactant molecule at bubble, give elasticity and the self-reparing capability of have good lather, thereby reach desirable especially steady bubble effect.
Polyether modified silicon oil is the organosilicon non-ionic surface active agent that adopts a kind of unique properties that polyethers and dimethyl siloxane graft copolymerization forms, and can reduce internal friction, the stress of its molecule, thereby play levelling, froth breaking for the present invention; In batching, when polyether modified silicon oil≤0.1%, be mainly the effect of playing levelling agent, be conducive to illite compound foaming agent and steadily foam.In the time adding hydrogen peroxide in batching, expansion rate is very fast, generates a small amount of invalid macrofoam, when polyether modified silicon oil >=0.1%, plays the effect of defoamer, is conducive to eliminate this part invalid macrofoam.
The present invention is achieved by following technical proposals:
Illite environment-friendly foaming abatvoix is a kind of rectangular plate-shaped body, is made up of built-in frame and illite compound foaming agent, is designed with 4～32 short steel pipes in built-in frame, and the endoporus of short steel pipes is the installing hole of illite environment-friendly foaming abatvoix; Built-in frame is lain on mould, after short steel pipes in built-in frame inserts column, adopt illite compound foaming agent to be cast in built-in frame periphery, built-in frame is illite environment-friendly foaming abatvoix semiproduct after being embedded in the inside of illite compound foaming agent completely; Solidify after processing through 1～7 day leave standstill, illite environment-friendly foaming abatvoix semiproduct are taken out from mould, be transported to roasting in tunnel cave, sintering temperature is controlled at 450～750 ℃, roasting time is controlled at 3～8 hours, is packaged as illite environment-friendly foaming abatvoix finished product after cooling.
Described illite compound foaming agent batching is made up of following component by weight percentage: illite compound foaming agent paste 35～85%, hydrogen peroxide 2～35%, polyether modified silicon oil 0.001～5% and water 1～45%; The production method of illite compound foaming agent: will stir in illite compound foaming agent batching input homogenizer, the speed of mixer is controlled at 1400～1800 revs/min, mixing time is controlled at 2～30 minutes, after stirring, be illite compound foaming agent, in illite compound foaming agent, contain a large amount of stable intensive bubbles.
Described illite compound foaming agent paste batching is made up of following component by weight percentage: Erie's stone flour 15～55%, the concave convex rod potter's clay powder 5～35% with air purification function, DDAO 0.01～25%, cocounut oil acyl diethanol amine 0.01～20%, silicones polyethers emulsion 0.01～5% and water 5～55%; The production method of illite compound foaming agent paste: will stir in illite compound foaming agent paste batching input low-speed mixer, the speed of mixer is controlled at 600～800 revs/min, mixing time is controlled at 2～20 minutes, after stirring for illite compound foaming agent paste, generating portion bubble in illite compound foaming agent paste.
Described illite powder producing method is: 1. illite is inputted in mill and pulverized, grain fineness≤5 millimeter; 2. will in the illite input flour mill after pulverizing, be processed as Erie's stone flour, grain fineness≤0.074 millimeter of Erie's stone flour.
The production method of the described concave convex rod potter's clay powder with air purification function is: (1) rear the input in mill of batching mixing of the concave convex rod potter's clay powder with air purification function pulverized, the compound particles fineness after pulverizing is less than 0.5 millimeter; (2) pulverulent mixture is added and soak water in old pond and soak the old semiproduct that are treated to, soak the old time to be controlled at 7～30 days; (3) semiproduct are inputted in vacuum-extruder and be squeezed into cylindrical strip thing, the diameter control of cylindrical strip thing is at 2～10 millimeters; (4) cylindrical strip thing is input to cement threshing ground and carries out airing, the cylindrical strip thing water content after airing is less than 15%; (5) be powder by carrying out abrasive dust in the cylindrical strip thing input grinding machine after airing, the grain fineness of powder is less than 0.074 millimeter.
The batching of the described concave convex rod potter's clay powder with air purification function is made up of following component by weight percentage: high sticky Concave-convex clay rod 35～60%, attapulite constant humidity amendment 10～35%, natural-minerals adsorptive filter medium 5～20%, cacumen biotae 2～15%, alumina silicate fibre 1～5% and polyacrylamide 0.1～3%.
The concave convex rod potter's clay powder with air purification function is to adopt by the inventor in application on February 25th, 2011 " having the concave convex rod potter's clay powder of air purification function ", Chinese patent notice of authorization number is: CN 102173743 B, notice of authorization day: on July 25th, 2012.
The sticky Concave-convex clay rod of described height is the Concave-convex clay rod that adopts the processing technology that improves viscosity of attapulgite clay to produce, it is characterized in that, and from the Concave-convex clay rod of mining area exploitation, need to be through the weathering of 30～120 days; Modification processing method is: calculate by weight percentage, get the Concave-convex clay rod 94～98% after weathering, evenly add 2～6% sodium carbonate, jointly input in fermentation vat, add clear water to soak ageing, soak time is 72～120 hours; Get the Concave-convex clay rod after immersion, in input mixer, stir, and by the Concave-convex clay rod after stirring, be extruded into thin slice through extruder, its THICKNESS CONTROL is at 0.5～2 millimeter, by Concave-convex clay rod thin slice, carry out airing, the Concave-convex clay rod thin slice after airing, its water content≤15%; Batching is calculated by weight percentage: Concave-convex clay rod 94～98%, high hydroscopic resin 0.5～5% and cellulose 0.5～3% after airing, above-mentioned batching is stirred, and after stirring, input and in grinding machine, carry out abrasive dust, grain fineness≤0.074 millimeter.
Above-mentioned production technology is to adopt " the improving the processing technology of viscosity of attapulgite clay " of being applied on June 20th, 2005 by the inventor, and Chinese patent notice of authorization number is: CN 1317067C, notice of authorization day: on May 23rd, 2007.
Rice hulls, quick dissolved sodium silicate and the zeolite powder of described attapulite constant humidity amendment after by Concave-convex clay rod, montmorillonite, acidifying forms; The production method of attapulite constant humidity amendment is: the rice hulls after acidifying and Concave-convex clay rod and montmorillonite are uniformly mixed by batching, extrusion modification slabbing mixture, abrasive dust after airing, be uniformly mixed by batching with quick dissolved sodium silicate and zeolite powder again, be packaged as attapulite constant humidity amendment; The batching of attapulite constant humidity amendment is made up of following component by weight percentage: the semiproduct 55～90% of attapulite constant humidity amendment, quick dissolved sodium silicate 2～8% and zeolite powder 5～40%; The half-finished batching of attapulite constant humidity amendment, is made up of following component by weight percentage: rice hulls 5～15%, Concave-convex clay rod 35～55%, montmorillonite 5～15% and water 35～55% after acidifying.
Aforementioned production method is to adopt " production method of attapulite constant humidity amendment " of being applied on August 30th, 2007 by the inventor, and Chinese patent notice of authorization number is: CN100528337C, notice of authorization day: on August 19th, 2009.
Swell soil after the zeolite of the batching of described natural-minerals adsorptive filter medium after by acidifying, Concave-convex clay rod, the acidifying after acidifying, kieselguhr, lava and the alumine after acidifying form; The preparation method of natural-minerals adsorptive filter medium is: natural-minerals adsorptive filter medium is mixed, pulverized, sieves, is packaged as to the batching process of natural-minerals adsorptive filter medium.
The batching of natural-minerals adsorptive filter medium is made up of following component by weight percentage: kieselguhr 10～20%, lava 5～10% and alumine 5～10% after the Concave-convex clay rod 15～35% after zeolite 15～35%, acidifying after acidifying, swell soil 15～25%, the acidifying after acidifying.
Natural-minerals adsorptive filter medium adopts " natural-minerals adsorptive filter medium " applied on May 30th, 2006 by the inventor, and Chinese patent notice of authorization number is: CN100502999C, notice of authorization day: on June 24th, 2009.
Described PCm is weight percentage.
Described built-in frame is a kind of rectangular steel structure frame, in built-in frame, is made up of 4～32 short steel pipes, 4～52 punching expanded metal laths and 2～42 reinforcing ribs; The upper plane of short steel pipes is processed as a kind of counter sink, between short steel pipes and short steel pipes, be welded as a rectangular frame with punching expanded metal lath, punching expanded metal lath hole is circular opening, the horizontal center line overlaid at the horizontal center line at short steel pipes height 1/2 place and punching expanded metal lath width 1/2 place, the interior diagonal take height 1/2 place between short steel pipes and short steel pipes of rectangular frame is as interface, be welded as reinforcing rib with screw-thread steel, jointly form a built-in frame; In built-in frame, the plane of short steel pipes top counter sink consists of plane on built-in frame jointly, and short steel pipes lower flat consists of built-in frame lower plane jointly.
For the production of the separate case application of built-in frame of abatvoix utility model patent, number of patent application is: 201320579228.1, the applying date: on September 18th, 2013.
Described mould is a kind of rectangular mould, is made up of a block length square floor, a rectangle locating slot, a rectangle frame, 2 rectangle handles and 4～32 cylindrical columns; Locating slot is welded on the upper plane of die bottom plate according to the position dimension of design, column is arranged on the upper plane of die bottom plate according to the relative position size of design, frame is placed in locating slot, 2 handles are arranged on respectively middle outside frame the right and left, and the lower plane of die bottom plate is placed on vibrations workbench.
For the production of the separate case application of mould of abatvoix utility model patent, number of patent application is: 201320575991.7, the applying date: on September 17th, 2013.
In illite environment-friendly foaming abatvoix, inlay built-in frame, illite compound foaming agent solidifies a rear and integrated entirety of built-in frame formation, illite environment-friendly foaming abatvoix semiproduct, after roasting, have increased bulk strength, counter-bending ability and the practical effect of illite environment-friendly foaming abatvoix greatly.
At construction site, do not need boring, directly with cross recessed countersunk head tapping screw, illite environment-friendly foaming abatvoix is arranged on the metope of building, saving of work and time, can not cause the fragmentation from building wall of illite environment-friendly foaming abatvoix to come off yet.
It is evenly fine and smooth that illite compound foaming agent in illite environment-friendly foaming abatvoix has the abscess that foaming capacity is strong, coefficient of foaming is high, unit volume bubble production volume large, produce, foam adventitia good toughness is difficult for broken, foam stability is good, can be for a long time froth breaking not, produce invalid bubble to reduce product surface, improve the make rate of abscess, the effect of the mould that prevents from collapsing.
Illite environment-friendly foaming abatvoix there will not be layering in casting process, and product stripping speed is fast, and finish is good, has further improved the later strength of product.
Illite compound foaming agent adopts the concave convex rod potter's clay powder with air purification function for being mainly raw material; there is good caking property, plasticity, thixotropy, refractoriness and heat stability; the effectively hazardous substances such as formaldehyde, ammonia and benzene in absorbed air, protection of the environment and promote the healthy of people.
Illite environment-friendly foaming abatvoix not only has the effect that strengthens sound-absorbing and control noise pollution, the function that also has insulation, adsorbs and purify air.
Illite environment-friendly foaming abatvoix is applicable to be arranged in the facilities such as speedway, viaduct, urban light rail, subway, factory, warehouse, public place.
Accompanying drawing explanation
Fig. 1 is illite environment-friendly foaming abatvoix schematic diagram, Fig. 2 be the A-A of Fig. 1 to view, Fig. 3 is the schematic diagram of built-in frame while lying in cast in mould, illite environment-friendly foaming abatvoix is arranged on the schematic diagram on building wall by Fig. 4.
As shown in the figure: the 1st, illite environment-friendly foaming abatvoix, the 2nd, built-in frame, the 3rd, illite compound foaming agent, the 4th, mould, the 5th, short steel pipes, the 6th, column, the 7th, cross recessed countersunk head tapping screw, the 8th, the metope of building.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described:
Illite environment-friendly foaming abatvoix is a kind of rectangular plate-shaped body 1, is made up of built-in frame 2 and illite compound foaming agent 3, is designed with 6 short steel pipes 5 in built-in frame 2; Built-in frame 2 is lain on mould 4, after short steel pipes 5 in built-in frame 2 inserts column 6, adopt illite compound foaming agent 3 to be cast in built-in frame 2 peripheries, built-in frame 2 is illite environment-friendly foaming abatvoix semiproduct after being embedded in the inside of illite compound foaming agent 3 completely; Solidify after processing through 5 days leave standstill, illite environment-friendly foaming abatvoix semiproduct are taken out from mould, be transported to roasting in tunnel cave, sintering temperature is controlled at 550～650 ℃, roasting time is controlled at 5 hours, is packaged as illite environment-friendly foaming abatvoix finished product after cooling.
Illite compound foaming agent batching is made up of following component by weight percentage: illite compound foaming agent paste 68%, hydrogen peroxide 22.95%, polyether modified silicon oil 0.05% and water 9%; The production method of illite compound foaming agent: will stir in illite compound foaming agent batching input homogenizer, the speed of mixer is controlled at 1400～1800 revs/min, mixing time is controlled at 10 minutes, is illite compound foaming agent after stirring.
Described illite compound foaming agent paste batching is made up of following component by weight percentage: Erie's stone flour 32%, the concave convex rod potter's clay powder 24% with air purification function, DDAO 3%, cocounut oil acyl diethanol amine 2%, silicones polyethers emulsion 1% and water 38%; The production method of illite compound foaming agent paste: will stir in illite compound foaming agent paste batching input low-speed mixer, the speed of mixer is controlled at 600～800 revs/min, mixing time is controlled at 12 minutes, is illite compound foaming agent paste after stirring.
Described illite powder producing method is: 1. illite is inputted in mill and pulverized, grain fineness≤5 millimeter; 2. will in the illite input flour mill after pulverizing, be processed as Erie's stone flour, grain fineness≤0.074 millimeter of Erie's stone flour.
At construction site, directly with cross recessed countersunk head tapping screw 7, illite environment-friendly foaming abatvoix 1 is arranged on the metope 8 of building.
Claims (5)
1. an illite environment-friendly foaming abatvoix, it is characterized in that, illite environment-friendly foaming abatvoix is a kind of rectangular plate-shaped body, formed by built-in frame and illite compound foaming agent, in built-in frame, be designed with 4～32 short steel pipes, the endoporus of short steel pipes is the installing hole of illite environment-friendly foaming abatvoix; Built-in frame is lain on mould, after short steel pipes in built-in frame inserts column, adopt illite compound foaming agent to be cast in built-in frame periphery, built-in frame is illite environment-friendly foaming abatvoix semiproduct after being embedded in the inside of illite compound foaming agent completely; Solidify after processing through 1～7 day leave standstill, illite environment-friendly foaming abatvoix semiproduct are taken out from mould, be transported to roasting in tunnel cave, sintering temperature is controlled at 450～750 ℃, roasting time is controlled at 3～8 hours, is packaged as illite environment-friendly foaming abatvoix finished product after cooling;
Described illite compound foaming agent batching is made up of following component by weight percentage: illite compound foaming agent paste 35～85%, hydrogen peroxide 2～35%, polyether modified silicon oil 0.001～5% and water 1～45%; The production method of illite compound foaming agent: will stir in illite compound foaming agent batching input homogenizer, the speed of mixer is controlled at 1400～1800 revs/min, mixing time is controlled at 2～30 minutes, after stirring, be illite compound foaming agent, in illite compound foaming agent, contain a large amount of stable intensive bubbles;
Described illite compound foaming agent paste batching is made up of following component by weight percentage: Erie's stone flour 15～55%, the concave convex rod potter's clay powder 5～35% with air purification function, DDAO 0.01～25%, cocounut oil acyl diethanol amine 0.01～20%, silicones polyethers emulsion 0.01～5% and water 5～55%; The production method of illite compound foaming agent paste: will stir in illite compound foaming agent paste batching input low-speed mixer, the speed of mixer is controlled at 600～800 revs/min, mixing time is controlled at 2～20 minutes, after stirring for illite compound foaming agent paste, generating portion bubble in illite compound foaming agent paste;
Described illite powder producing method is: 1. illite is inputted in mill and pulverized, grain fineness≤5 millimeter; 2. will in the illite input flour mill after pulverizing, be processed as Erie's stone flour, grain fineness≤0.074 millimeter of Erie's stone flour.
2. the production method according to claim 1 with the concave convex rod potter's clay powder of air purification function is: it is characterized in that, (1) rear the input in mill of batching mixing of the concave convex rod potter's clay powder with air purification function pulverized, the compound particles fineness after pulverizing is less than 0.5 millimeter; (2) pulverulent mixture is added and soak water in old pond and soak the old semiproduct that are treated to, soak the old time to be controlled at 7～30 days; (3) semiproduct are inputted in vacuum-extruder and be squeezed into cylindrical strip thing, the diameter control of cylindrical strip thing is at 2～10 millimeters; (4) cylindrical strip thing is input to cement threshing ground and carries out airing, the cylindrical strip thing water content after airing is less than 15%; (5) be powder by carrying out abrasive dust in the cylindrical strip thing input grinding machine after airing, the grain fineness of powder is less than 0.074 millimeter; The batching with the concave convex rod potter's clay powder of air purification function is made up of following component by weight percentage: high sticky Concave-convex clay rod 35～60%, attapulite constant humidity amendment 10～35%, natural-minerals adsorptive filter medium 5～20%, cacumen biotae 2～15%, alumina silicate fibre 1～5% and polyacrylamide 0.1～3%.
3. built-in frame is a kind of rectangular steel structure frame according to claim 1, it is characterized in that, in built-in frame, is made up of 4～32 short steel pipes, 4～52 punching expanded metal laths and 2～42 reinforcing ribs; The upper plane of short steel pipes is processed as a kind of counter sink, between short steel pipes and short steel pipes, be welded as a rectangular frame with punching expanded metal lath, punching expanded metal lath hole is circular opening, the horizontal center line overlaid at the horizontal center line at short steel pipes height 1/2 place and punching expanded metal lath width 1/2 place, the interior diagonal take height 1/2 place between short steel pipes and short steel pipes of rectangular frame is as interface, be welded as reinforcing rib with screw-thread steel, jointly form a built-in frame; In built-in frame, the plane of short steel pipes top counter sink consists of plane on built-in frame jointly, and short steel pipes lower flat consists of built-in frame lower plane jointly.
4. mould is a kind of rectangular mould according to claim 1, it is characterized in that, is made up of a block length square floor, a rectangle locating slot, a rectangle frame, 2 rectangle handles and 4～32 cylindrical columns; Locating slot is welded on the upper plane of die bottom plate according to the position dimension of design, column is arranged on the upper plane of die bottom plate according to the relative position size of design, frame is placed in locating slot, 2 handles are arranged on respectively middle outside frame the right and left, and the lower plane of die bottom plate is placed on vibrations workbench.
5. high sticky Concave-convex clay rod is the Concave-convex clay rod that adopts the processing technology that improves viscosity of attapulgite clay to produce according to claim 2, it is characterized in that, and from the Concave-convex clay rod of mining area exploitation, need to be through the weathering of 30～120 days; Modification processing method is: calculate by weight percentage, get the Concave-convex clay rod 94～98% after weathering, evenly add 2～6% sodium carbonate, jointly input in fermentation vat, add clear water to soak ageing, soak time is 72～120 hours; Get the Concave-convex clay rod after immersion, in input mixer, stir, and by the Concave-convex clay rod after stirring, be extruded into thin slice through extruder, its THICKNESS CONTROL is at 0.5～2 millimeter, by Concave-convex clay rod thin slice, carry out airing, the Concave-convex clay rod thin slice after airing, its water content≤15%; Batching is calculated by weight percentage: Concave-convex clay rod 94～98%, high hydroscopic resin 0.5～5% and cellulose 0.5～3% after airing, above-mentioned batching is stirred, and after stirring, input and in grinding machine, carry out abrasive dust, grain fineness≤0.074 millimeter.
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| EP1079036A2 (en) * | 1999-08-27 | 2001-02-28 | Armstrong World Industries, Inc. | Acoustical panel having a calendered, flame-retardant paper backing and method of making the same |
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Application publication date: 20140514 |