CN105820311A - Desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board and preparing method thereof - Google Patents

Desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board and preparing method thereof Download PDF

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CN105820311A
CN105820311A CN201610409668.0A CN201610409668A CN105820311A CN 105820311 A CN105820311 A CN 105820311A CN 201610409668 A CN201610409668 A CN 201610409668A CN 105820311 A CN105820311 A CN 105820311A
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fireproof
polyol
component
heated board
catalyst
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丁寅
徐东洋
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Nanjing University
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Nanjing University
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    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
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    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
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  • Polymers & Plastics (AREA)
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Abstract

The invention discloses a desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board. The desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board comprises ingredients A and ingredients B. The ingredients A comprise polyether polyol, polyester polyol, polypropylene glycol, structural flame resistant polyol, modified desulphurization gypsum powder, a foam stabilizer, a gel-type catalyst, a trimerization catalyst, a liquid fire retardant and a foaming agent; the ingredients B comprise polyaryl polymethylene isocyanate. A preparing method includes the steps that the ingredients A are stirred to be even, the foaming agent is added, then the ingredients B are added, the mixture is stirred at the high speed to be poured into a constant temperature mold, foamed, cured and demolded, and the desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board is prepared. According to the desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board and the preparing method, a by-product desulphurization gypsum of the coal electricity plant industry is fully used, desulphurization gypsum powder is successfully and organically modified, and the compatibility between the desulphurization gypsum powder and a raw polyurethane material is enhanced; the product has high fireproof performance and good mechanical performance at the same time, and combustion performance can meet the A-grade requirement of the national standard.

Description

A kind of desulfurated plaster-polyurethane composite fireproof heat preservation board and preparation method thereof
Technical field
The present invention relates to heat-insulating construction material, be specifically related to a kind of desulfurated plaster that can reach fire prevention and heat insulating effect Rigid foam polyurethane.
Background technology
Along with progress and the raising of national economy of science and technology, building energy conservation is increasingly becoming country and social concerns Focus and emphasis, and insulated fire is the emphasis direction of building energy conservation.For heat insulation effect, poly-ammonia Ester rigid foam is shown one's talent in all multi-polymer materials, and it has, and heat conductivity is low, compressive strength and chi The advantages such as very little good stability, relative mass are light, waterproof, ageing-resistant.But simple hard polyurethane foam pole Easy firing, contact burning things which may cause a fire disaster can produce flame immediately, and fire resistance is poor, is applied to produce restriction greatly.Mesh Before along with country more and more higher to public place fire-retardant product performance requirement, hard polyurethane foam is in fire protecting performance The challenge of aspect is the most increasing.
Generally, the method being used for improving hard polyurethane foam material fire resistance is to urethane raw Middle addition fire retardant, fire retardant is divided into addition type and response type two kinds, between additive flame retardant and urethane raw There is not chemical reaction, only fill with physical form and be distributed in polyurethane matrix, such as aluminium hydroxide, hydroxide Magnesium, antimony oxide, Firebrake ZB, silicon dioxide, the inorganic combustion inhibitor such as expansible graphite, tripolycyanamide, poly- Ammonium phosphate, the organic fire-retardant such as dimethyl methyl phosphonate, additive flame retardant and polyurethane matrix poor compatibility, Easily cause matrix when loading is bigger to come off, poor mechanical property；Reactive flame retardant is in polyurethane building-up process Participate in polyreaction and ignition-proof element be attached on main chain or side chain, such as the polyether polyol of phosphoric acid ester, containing Azepine ring system polyether polyol etc..Reactive flame retardant is owing to participating in polyreaction, with polyurethane-base compatability Good, flame retarding efficiency is high, but synthesis technique is complicated, relatively costly.
Some zero calorific values or low-calorie inorganic material are little due to combustion heat value, nontoxic, and the feature such as cheap and easy to get is subject to To producer and the favor of related scientific research mechanism, but inorganic material is applied to building heat preservation domain variability and does not unify Standard and method.If the Chinese patent of Publication No. CN103397735A is i.e. a kind of autoclaved fly ash straw Stalk polyurathamc warming plate, first Calx and flyash through being milled to particle diameter≤0.5mm, then carries out blank Preparation, steam pressure molding, room temperature maintenance 28 days, making moisture content≤2% i.e. one-shot forming is calcium silicate board (1)； Again crushed stalk to particle diameter≤5mm, add the stirring of polyurathamc high speed, when room temperature reaches ＞ 15 DEG C Time foaming, then pour molding, finally carrying out excision forming is polyurathamc heat-insulation layer (2), and foam poly-ammonia Ester heat-insulation layer double faced adhesive aluminium foil；Finally polyurathamc heat-insulation layer (2) close packed to calcium silicate board (1) Space in insulation wallboard.The warming plate manufacturing cycle of this invention is longer, and calcium silicate board is with poly- Due to bad adhesion between urethane plate, easily cause the shortcoming such as come off of sheet material when running into burning things which may cause a fire disaster.Publication No. The Chinese patent of CN104672415A discloses a kind of polyurethane-rock wool heat-preservation fire proofing material and preparation method, Now with grinder by rock wool grind into powder, polyether mixture and rock wool powder are carried out low pressure premix 30min Above, material the most uniformly mixes, and is pressurized to 3.0-1.0MPa high pressure conditions by force (forcing) pump, then enters One step adds foaming agent, foam stabilizer etc..This warming plate prepared is due to the existence of rock wool, it may appear that unit weight height, The shortcomings such as water proofing property is poor, construction process requirement is high.
Desulfurization gypsum powder is the solid waste that coal-fired plant produces in sulfur removal technology section, its chemical composition and natural stone Cream is close, utilizes desulfurated plaster as the implant of building heat preservation wallboard, can not only solve the outlet of desulfurated plaster, Reduce composite production cost, and when breaking out of fire, desulfurated plaster can discharge water of crystallization, plays anti- Fire action, desulfurated plaster itself is also the material that a kind of calorific value is extremely low, has noninflammability.
Summary of the invention
Low for fire protecting performance in existing insulation material, production cost is high, the problems such as heat insulation effect is the best, this Bright main purpose is to provide a kind of desulfurated plaster-polyurethane composite fireproof heat preservation board and preparation method, former maintaining While having heat insulation effect, improve fire protecting performance, enhance mechanical strength, reduce production cost simultaneously. Owing to desulfurization gypsum powder itself is not involved in the polymerization process of hard polyurethane foam, therefore have no effect on poly-ammonia Overall pore-forming that ester hard bubbles and heat-insulating property, and desulfurization gypsum powder itself can replace the work of part fire retardant With, improve the fire protecting performance of composite.The present invention additionally uses a kind of novel structural type fire retardant aliphatic Boryl polyhydric alcohol, as one of the raw material of hard polyurethane foam.
The technical solution used in the present invention is:
A kind of desulfurated plaster-polyurethane composite fireproof heat preservation board, it includes A, B two and forms part, described A Component is made up of the raw material of following masses number: polyether polyol: 40-60 part, PEPA: 10-20 Part, polypropylene glycol: 5-10 part, structural type flame-proof polyol: 15-25 part, modified desulfurization gypsum powder: 25-40 Part, foam stabilizer: 2-3.5 part, gel-type catalyst: 0.5-2 part, catalyst for trimerization: 1-3 part, liquid hinders Combustion agent: 10-20 part, foaming agent: 25-40 part；The mass parts of B component is: the many isocyanides of polymethylene polyphenyl Acid esters: 100-180 part, is stirring evenly and then adding into foaming agent by component A, is subsequently added B component, high-speed stirring Pour into after mixing the foaming of constant temperature mould, ripening, the demoulding prepare desulfurated plaster-polyurethane composite fireproof heat preservation board.
Above-mentioned fireproof heated board, described structural type flame-proof polyol is aliphatic boryl flame-proof polyol.
Above-mentioned fireproof heated board, in described component A, polyether polyol is polytetrahydrofuran polyol or polyoxy One or more of change propylene polyhydric alcohol, hydroxyl value is 420-480mgKOH/g, and viscosity is 2000-3500mPa.s (25 DEG C), preferred, polyethers polyhydric alcohol 403, polyether polyol 380, polyether polyol 4110, polyether polyols One or more of alcohol 635C.Described PEPA be aliphatic polyester polyols or aromatic polyester polynary One or more of alcohol, hydroxyl value is 400-440mgKOH/g, and viscosity is 4000-6000mPa.s (25 DEG C), Preferably PEPA P-455N, PEPA SKR-400E, the one of PEPA 3152 or several Kind.Described polypropylene glycol is polypropylene glycol 1000, and hydroxyl value is 100-130mgKOH/g, and viscosity is 1000-1300mPa.s(25℃)。
Above-mentioned fireproof heated board, in described component A, catalyst includes gel-type catalyst and catalyst for trimerization, The wherein preferred dibutyl tin laurate of gel-type catalyst, stannous octoate or the one of triethylene diamine or two Kind, the preferred N of catalyst for trimerization, N-dimethyl cyclohexyl amine, N, N-dimethyl benzylamine, 1,3,5-tri-(two Methylaminopropyl) Hexahydrotriazine, the combination in any of one or more of pentamethyl-diethylenetriamine.
Above-mentioned fireproof heated board, liquid flame retardant preferably phosphoric acid front three phenyl ester (TCP) in described component A, Dimethyl methyl phosphonate (DMMP), triethyl phosphate, tetraphenyl resorcinol double focusing phosphate ester (RDP) In the combination in any of one or more.
Above-mentioned fireproof heated board, in described component A, foam stabilizer is polysiloxanes, polyether silicone or polyethers One or more of modified siloxane.It is preferably foam stabilizer AK-8801, AK-8805, AK8812 (Jiangsu Beautiful think Dehua and learn limited company), polyether modified silicon oil HK-102 (Jining Hua Kai resin company limited) One or more.
Above-mentioned fireproof heated board, in described component A, foaming agent is a fluorine dichloroethanes or the one of Pentamethylene. Or it is several.
A kind of preparation method of above-mentioned fireproof heated board, it comprises the following steps:
Step 1, weigh raw material by the mass fraction in above-mentioned component A, by polyether polyol, polyester polyols Alcohol, polypropylene glycol, structural type flame-proof polyol, modified desulfurization gypsum powder mix homogeneously, add foam stabilization Agent, gel-type catalyst, catalyst for trimerization, liquid flame retardant, it is stirring evenly and then adding into foaming agent；
Step 2, weigh poly methylene poly phenyl poly isocyanate by the mass fraction in above-mentioned B component, by group Divide and high-speed stirred after B component mixing, after liquid foam is milky white, is rapidly injected in constant temperature mould foaming, ripe Change, the demoulding, obtain desulfurated plaster-polyurethane composite fireproof heat preservation board.
The preparation method of above-mentioned fireproof heated board, in described component A, the preparation method of modified desulfurization gypsum powder is:
Take the 5%-10% that amount is desulfurization gypsum powder quality of coupling agent, be configured to the ethanol containing coupling agent 2%-4% Solution, is placed in desulfurization gypsum powder in the ethanol solution containing coupling agent, filters after stirring, and filter cake exists Being dried 2h at 100 DEG C-120 DEG C, prepare modified desulfurization gypsum powder, wherein coupling agent is Silane coupling agent KH550 Or butyl titanate.
The preparation method of above-mentioned fireproof heated board, in described component A, structural type flame-proof polyol is aliphatic boryl Flame-proof polyol, its preparation method is:
Boric acid, 1,3-PD and dimethylbenzene are reacted under nitrogen protection according to the mass ratio of 5:24:15, instead Answer temperature to be 130-145 DEG C, during constantly distribute the water of generation by water knockout drum, response time 2.5-4h, Then cool down layering, purification obtains aliphatic boryl flame-proof polyol, detection hydroxyl value (OH) 400-450mgKOH/g, acid number 2.5-5.0mgKOH/g, viscosity 800-1600mPa.s (25 DEG C).
The invention comprehensively utilizes polyurethane heat-insulation excellent effect, heat conductivity is little with low heat value inorganic material not Combustion property, on the one hand, desulfurization gypsum powder is carried out organically-modified so that it is there is the Surface Physical Chemistry of hydrophobic oleophilic oil Character, enhances the compatibility with polymeric matrix, and the most modified desulfurization gypsum powder can be in polyhydric alcohol Forming a stable thixotropic dispersion system, after polyurethane foam molding, modified desulfurization gypsum powder can be distributed in bubble In the skeleton of hole wall and cellular material, strengthen hole wall and the rigidity of foam, and modified desulfurization gypsum powder also has Nontoxic, non-volatile, Heat stability is good, the advantage such as not precipitation；On the other hand, reactive flame retardant fat is used Race's boryl polyhydric alcohol, with isocyanates generation polyreaction, reduces the usage amount of raw material polyether polyol, and Containing boron class ignition-proof element in molecule, the fire resistance of foam is made also to increase.
The beneficial effect of hinge structure of the present invention:
(1) utilize solid waste desulfurated plaster, reduce production cost, reduce the wasting of resources, reach energy-conservation and subtract Row, the purpose developed a circular economy；
(2) desulfurization gypsum powder is carried out organically-modified by the present invention, makes modified desulfurization gypsum powder have very with polyurethane matrix The good compatibility, method of modifying is simple to operation, is also suitable for being amplified to commercial production；
(3) present invention prepares a kind of reaction-type flame-retarding boron-containing multi-element alcohol, both can part alternative materials polyether polyols Alcohol, ignition-proof element boron is connected on hard polyurethane foam strand simultaneously, also increases the fire resistance of happy polyurethane foam；
(4) desulfurated plaster that the present invention makes-polyurethane composite fireproof heat preservation board has good heat-insulating and fire-proof performance, The limited oxygen index of the material combustion prepared after testing is up to 36%, and combustibility reaches in GB 8624-2012 A level do not fire, heat conductivity is at about 0.025W/m.k, and compressive strength is big, good stability of the dimension.
Detailed description of the invention
Below use embodiment illustrate the present invention a kind of desulfurated plaster-polyurethane composite fireproof heat preservation board and Its preparation method.Embodiment is that the present invention is described in further detail, but they do not constitute limit to the present invention Fixed.
Inventive desulfurization Gypsum Fibrosum-polyurethane composite fireproof heat preservation board is prepared as follows and forms:
Weighing polyether polyol, PEPA, polypropylene glycol by formula as below amount, structural type flame-proof polyol (is pressed Said method is made by oneself), modified desulfurization gypsum powder mix homogeneously, add foam stabilizer, gel-type catalyst, three Poly-catalyst, liquid flame retardant, it is stirring evenly and then adding into foaming agent；The many benzene of polymethylene is weighed again by formula ratio Quito isocyanates, continues mix and blend with said mixture, is rapidly injected constant temperature mould after liquid foam is milky white Tool foams, ripening, the demoulding, obtain desulfurated plaster-polyurethane composite fireproof heat preservation board.
Embodiment 1:
The composition of raw materials preparing desulfurated plaster-polyurethane composite fireproof heat preservation board is as follows: polyether polyol 403 (Shandong Company): 30 parts, polyether polyol 4110 (Shandong company): 20 parts, PEPA 3152 (Beijing Certain company): 10 parts, polypropylene glycol 1000 (Shandong company): 8 parts, structural type flame-proof polyol (from System): 15 parts, modified desulfurization gypsum powder: 30 parts, foam stabilizer AK-8801 (Jiangsu company) 1 part, even Infusion AK-8805 (Jiangsu company) 1 part, dibutyl tin laurate (Jiangsu company): 0.5 part, N, N-dimethyl cyclohexyl amine (Zhejiang company): 2 parts, tricresyl phosphate (TCP) (Tianjin company): 15 parts, one fluorine dichloroethanes HCFC-141B (Shandong company): 25 parts；Polymethylene polyphenyl polyisocyanate Cyanate: 150 parts.
Embodiment 2:
The composition of raw materials preparing desulfurated plaster-polyurethane composite fireproof heat preservation board is as follows: polyether polyol 635C (Shandong Certain company): 10 parts, polyether polyol 380 (Shandong company): 20 parts, polyether polyol 403 (Shandong Certain company): 10 parts, PEPA P-455N (Beijing company): 10 parts, PEPA SKR-400E (Beijing company): 10 parts, polypropylene glycol 1000 (Shandong company): 6 parts, structural type is fire-retardant polynary Alcohol (is made by oneself): 22 parts, modified desulfurization gypsum powder: 40 parts, foam stabilizer AK-8812 (Jiangsu company) 1.5 Part, foam stabilizer AK-8805 (Jiangsu company) 0.5 part, foam stabilizer HK-102 (Shandong company) 0.5 Part, stannous octoate (Jiangsu company): 1 part, 1,3,5-tri-(dimethylamino-propyl) Hexahydrotriazine (Jiangsu Certain company): 3 parts, dimethyl methyl phosphonate (DMMP) (Shenzhen company): 20 parts, Pentamethylene. (mountain Certain company of east): 35 parts；Poly methylene poly phenyl poly isocyanate: 180 parts.
Embodiment 3:
The composition of raw materials preparing desulfurated plaster-polyurethane composite fireproof heat preservation board is as follows: polyether polyol 4110 (Shandong Certain company): 20 parts, polyether polyol 380 (Shandong company): 5 parts, polyether polyol 403 (Shandong Certain company): 5 parts, polyether polyol 635C (Shandong company): 20 parts, PEPA 3152 (north Capital company): 15 parts, polypropylene glycol 1000 (Shandong company): 5 parts, structural type flame-proof polyol (from System): 25 parts, modified desulfurization gypsum powder: 35 parts, (Shandong is public for foam stabilizer polyether modified silicon oil HK-102 Department) 3.5 parts, stannous octoate (Jiangsu company): 0.5 part, dibutyl tin laurate (Jiangsu company): 1.5 part, pentamethyl-diethylenetriamine (Jiangsu company): 1 part, tetraphenyl resorcinol double focusing phosphate ester (RDP) (Guangdong company): 10 parts, one fluorine dichloroethanes HCFC-141B (Shandong company): 40 parts；The most sub- Methyl polyphenyl polyisocyanate: 100 parts.
Embodiment 4:
The composition of raw materials preparing desulfurated plaster-polyurethane composite fireproof heat preservation board is as follows: polyether polyol 4110 (Shandong Certain company): 60 parts, PEPA 3152 (Beijing company): 8 parts, PEPA P-455N (north Capital company): 10 parts, polypropylene glycol 1000 (Shandong company): 10 parts, structural type flame-proof polyol (from System): 20 parts, modified desulfurization gypsum powder: 25 parts, foam stabilizer AK-8812 (Jiangsu company) 2.5 parts, Foam stabilizer polyether modified silicon oil HK-102 (Shandong company) 0.5 part, dibutyl tin laurate (Jiangsu Company): 1.5 parts, N, N-dimethyl cyclohexyl amine (Zhejiang company): 1 part, 1,3,5-tri-(dimethylamino Propyl group) Hexahydrotriazine (Jiangsu company): 1.5 parts, tetraphenyl resorcinol double focusing phosphate ester (RDP) is (wide Certain company of east): 18 parts, one fluorine dichloroethanes HCFC-141B (Shandong company): 30 parts；Polymethylene Polyphenyl polyisocyanate: 120 parts.
The correlated performance test result of above-described embodiment composite fireproof heat preservation board is as shown in table 1.
Table 1
According to table 1 testing result, desulfurated plaster prepared by above example of the present invention-polyurethane composite thermal insulation PLASTIC LAMINATED Having the fire resistance of excellence, combustibility all reaches A level and does not fires, the most also keeps relatively low heat conductivity, Having good heat-insulating property, mechanical property has higher comprcssive strength, therefore can be widely applied to outside building Wall heat preservation construction field.

Claims (10)

1. desulfurated plaster-polyurethane composite fireproof heat preservation board, is characterized in that: it includes A, B two groups Composition, described A group composition is made up of the raw material of following masses number: polyether polyol: 40-60 part, polyester Polyhydric alcohol: 10-20 part, polypropylene glycol: 5-10 part, structural type flame-proof polyol: 15-25 part, modified de- Sulfur Gypsum Fibrosum powder: 25-40 part, foam stabilizer: 2-3.5 part, gel-type catalyst: 0.5-2 part, catalyst for trimerization: 1-3 part, liquid flame retardant: 10-20 part, foaming agent: 25-40 part；The mass parts of B component is: many methylenes Quito polyphenyl polyisocyanate: 100-180 part, is stirring evenly and then adding into foaming agent by component A, is subsequently added B component, pour into after high-speed stirred the foaming of constant temperature mould, ripening, the demoulding prepare desulfurated plaster-polyurethane multiple Close fireproof heated board.
Fireproof heated board the most according to claim 1, is characterized in that: described polyether polyol is poly-four One or more of hydrogen furan polyols or polyoxypropylene polyol, hydroxyl value is 420-480mgKOH/g, viscous Degree is 2000-3500mPa.s (25 DEG C).Described PEPA is aliphatic polyester polyols or fragrance adoption One or more of ester polyol, hydroxyl value is 400-440mgKOH/g, and viscosity is 4000-6000mPa.s (25℃).Described polypropylene glycol is polypropylene glycol 1000, and hydroxyl value is 100-130mgKOH/g, and viscosity is 1000-1300mPa.s(25℃)。
Fireproof heated board the most according to claim 1, is characterized in that: described structural type is fire-retardant polynary Alcohol is aliphatic boryl flame-proof polyol.
Fireproof heated board the most according to claim 1, is characterized in that: catalyst bag in described component A Including gel-type catalyst and catalyst for trimerization, wherein gel-type catalyst is dibutyl tin laurate, octanoic acid Asia One or both of stannum or triethylene diamine, catalyst for trimerization is N, N-dimethyl cyclohexyl amine, N, N-diformazan Base benzylamine, 1,3,5-tri-(dimethylamino-propyl) Hexahydrotriazine, the one of pentamethyl-diethylenetriamine or several Kind.
Fireproof heated board the most according to claim 1, in described component A, liquid flame retardant is tricresyl phosphate Toluene ester (TCP), dimethyl methyl phosphonate (DMMP), triethyl phosphate, tetraphenyl resorcinol are double The combination in any of one or more in poly phosphate (RDP).
Fireproof heated board the most according to claim 1, in described component A foam stabilizer be polysiloxanes, One or more of polyether silicone or polyether modified siloxane.
Fireproof heated board the most according to claim 1, in described component A, foaming agent is fluorine two chloroethene One or more of alkane or Pentamethylene..
8. a preparation method for the fireproof heated board described in claim 1, is characterized in that comprising the following steps:
Mass fraction in step 1, component A as described in claim 1 weighs raw material, by polyether polyol, PEPA, polypropylene glycol, structural type flame-proof polyol, modified desulfurization gypsum powder mix homogeneously, add Foam stabiliser, gel-type catalyst, catalyst for trimerization, liquid flame retardant, it is stirring evenly and then adding into foaming agent；
Mass fraction in step 2, B component as described in claim 1 weighs the many isocyanides of polymethylene polyphenyl Acid esters, high-speed stirred after component A and B component are mixed, after liquid foam is milky white, it is rapidly injected constant temperature mould Tool foams, ripening, the demoulding, obtain described desulfurated plaster-polyurethane composite fireproof heat preservation board.
The preparation method of fireproof heated board the most according to claim 6, is characterized in that in described component A modified The preparation method of desulfurization gypsum powder is:
Take the 5%-10% that amount is desulfurization gypsum powder quality of coupling agent, be configured to the ethanol containing coupling agent 2%-4% Solution, is placed in desulfurization gypsum powder in the ethanol solution containing coupling agent, filters after stirring, and filter cake exists Being dried 2h at 100 DEG C-120 DEG C, prepare modified desulfurization gypsum powder, wherein coupling agent is Silane coupling agent KH550 Or butyl titanate.
The preparation method of fireproof heated board the most according to claim 6, is characterized in that tying in described component A Configuration flame-proof polyol is aliphatic boryl flame-proof polyol, and its preparation method is:
Boric acid, 1,3-PD and dimethylbenzene are reacted under nitrogen protection according to the mass ratio of 5:24:15, instead Answer temperature to be 130-145 DEG C, during constantly distribute the water of generation by water knockout drum, response time 2.5-4h, Then cool down layering, purification obtains aliphatic boryl flame-proof polyol, detection hydroxyl value (OH) 400-450mgKOH/g, acid number 2.5-5.0mgKOH/g, viscosity 800-1600mPa.s (25 DEG C).
CN201610409668.0A 2016-06-12 2016-06-12 Desulphurization gypsum-polyurethane compounded fireproof and heat-preservation board and preparing method thereof Pending CN105820311A (en)

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CN109627742A (en) * 2018-11-29 2019-04-16 荣德铵家新型材料(福州)有限公司 A kind of method that sintering flue gas desulfurization ash prepares polyurethane plate
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