CN109251512A - A kind of long-acting weather-proof flame retarded rigid polyurethane foams - Google Patents
A kind of long-acting weather-proof flame retarded rigid polyurethane foams Download PDFInfo
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- CN109251512A CN109251512A CN201811078448.XA CN201811078448A CN109251512A CN 109251512 A CN109251512 A CN 109251512A CN 201811078448 A CN201811078448 A CN 201811078448A CN 109251512 A CN109251512 A CN 109251512A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2427/06—Homopolymers or copolymers of vinyl chloride
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- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a kind of long-acting weather-proof flame retarded rigid polyurethane foams, belong to technical field of polymer materials.The long-acting weather-proof flame retarded rigid polyurethane foams that the present invention develops include polyvinyl chloride, plasticizer, 4-butyl ammonium hydrogen sulfate, vulcanized sodium, polyether polyol, isocyanates, organotin, defoaming agent and fire retardant；In the preparation, after being first uniformly mixed polyether polyol, organotin, defoaming agent, fire retardant and plasticizer, isocyanates is added, continues to be stirred to react, obtains mixed liquor；It is dry after the reaction of polyvinyl chloride, 4-butyl ammonium hydrogen sulfate solution and vulcanized sodium heating stirring, obtain dried feed；It after mixed liquor and dried feed ball milling mixing, injects in mold, heat preservation stands curing, demoulds to get long-acting weather-proof flame retarded rigid polyurethane foams.The long-acting weather-proof flame retarded rigid polyurethane foams of gained of the invention have excellent flame retardant property and weatherability.
Description
Technical field
The invention discloses a kind of long-acting weather-proof flame retarded rigid polyurethane foams, belong to technical field of polymer materials.
Background technique
Polyurethane is a kind of damping material with practical value, the block copolymer that it is made of soft segment and hard section,
Between its macromolecular, especially electrostatic force is very strong between hard section, and there are also a large amount of hydrogen bonds to exist.These intermolecular forces
In addition to the mechanical property for directly affecting polyurethane, moreover it is possible to promote hard section to assemble, generate micron-scale phase separation structure appropriate, make poly- ammonia
Ester damping factor with higher.The key factor for determining polyurethane damping capacity is soft segment, the compatibility of hard section i.e. microcosmic phase
Separation degree, compatibility is very good or too poor all cannot act as damping material.Therefore, the composition of change soft segment, hard section can be passed through
And proportion, the damping capacity of polyurethane is adjusted within the scope of very wide temperature.
Polyurethane foam is a kind of important polyurethane synthetic material, has porosity, relative density is small, specific strength is high etc.
Feature can be made into common soft bubble, high rebound foam and hard bubble etc. according to the variation of raw materials used difference and formula.Different use
On the way, there is different requirements to foam.Raw material decides the performance of foam.Solvent type foaming agent is due to boiling point, diffusion coefficient, work
The limitations such as skill realization, are not able to satisfy the filling requirement for being about the aluminum profile of 25m.Because internal after being filled into certain length
Solvent volatilization is difficult, this will lead to the difficulty of the frostproof froth n inside aluminum profile, causes the uneven of foam density.
Polyurethane foam plastics has the superiority such as density is low, specific strength is high, good insulating, large specific surface area and sound-absorbing
Can, it is widely used as the fields such as heat-barrier material, packing, packaging material, sound-absorbing material and mat material.But due to polyurethane foam
Foam has porosity and density is lower, easily meets fire burning, and generate toxic gas (predominantly HCN and CO) and flue dust, from
And health of human body and Environmental security are seriously threatened, restrict the application and development of polyurethane foam significantly.Therefore, improve polyurethane
The anti-flammability of foam is current one of the research emphasis for improving polyurethane foam performance, wherein addition fire retardant is to improve polyurethane
The simplest method of foam anti-flammability.Since a large amount of smog and toxic corrosivity gas can be generated when the burning of halogen flame-retardant foam
Body causes " secondary hazards ", therefore halogen-free flameproof is one of fire-retardant research tendency of polyurethane foam.Polyurethane foam traditional at present
Foam directly adds fire retardant, and function and effect are single, and in use, because of the binding force between fire retardant and polyurethane matrix
It is weaker, it is easy to be lost, be gradually decreased so as to cause flame retardant effect, therefore also need to study it.
Summary of the invention
The present invention solves the technical problem of: fire retardant, function and effect are directly added for conventional polyurethane foams
It is single, and in use, because the binding force between fire retardant and polyurethane matrix is weaker, it is easy to be lost, so as to cause resistance
The drawbacks of fuel efficiency fruit gradually decreases provides a kind of long-acting weather-proof flame retarded rigid polyurethane foams.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
A kind of long-acting weather-proof flame retarded rigid polyurethane foams, the raw material including following parts by weight: 10~20 parts of polyvinyl chloride,
3~5 parts of plasticizer, 40~50 parts of 4-butyl ammonium hydrogen sulfate solution, 3~5 parts of vulcanized sodium, 40~50 parts of polyether polyol, 45~
60 parts of isocyanates, 0.3~0.5 part of organotin, 0.6~0.8 part of defoaming agent, 4~8 parts of fire retardants；
The preparation process of the long-acting weather-proof flame retarded rigid polyurethane foams are as follows:
(1) after being first uniformly mixed polyether polyol, organotin, defoaming agent, fire retardant and plasticizer, isocyanic acid is added
Ester continues to be stirred to react, obtains mixed liquor；
(2) by after the reaction of polyvinyl chloride, 4-butyl ammonium hydrogen sulfate solution and vulcanized sodium heating stirring, drying obtains dried feed；
(3) it by after mixed liquor and dried feed ball milling mixing, injects in mold, heat preservation stands curing, demoulds to get long-acting weather-proof
Flame retarded rigid polyurethane foams.
The plasticizer is the positive zinc ester of phthalic acid two, in dibutyl phthalate or repefral
Any one.
The polyether polyol is polyoxypropyleneglycol, and polyoxytetramethylene glycol or tetrahydrofuran-propylene oxide are total
Any one in polyglycols.
The isocyanates is toluene di-isocyanate(TDI), methyl diphenylene diisocyanate or trimethyl cyclohexane diisocyanate
Any one in ester.
The organotin is that stannous octoate and dibutyl tin dilaurate are that 3:1~5:1 is compounded in mass ratio.
The defoaming agent is any one in dimethyl silicone polymer or polyoxypropylene ethylene oxide glycerin ether.
The fire retardant is tributyl phosphate, any one in tricresyl phosphate or methylene bromide.
The beneficial effects of the present invention are:
(1) technical solution of the present invention in polyurethane system by adding the polyvinyl chloride tree for having excellent compatibility with polyurethane
Rouge, and by using 4-butyl ammonium hydrogen sulfate as phase transfer catalyst, using the compound (vulcanized sodium) containing sulfidion come
Replace chlorine unstable in Corvic, to make fluoropolymer resin that a degree of crosslinking occur, in following process mistake
Cheng Zhong, the cross-linking system are easy under foaming effect, gradually diffuse to product surface, thus in polyurethane foam system surface shape
At the polyvinyl chloride system of three-dimensional crosslinked network structure, the presence of the cross-linked network structure, on the one hand, improve polyurethane foam
The pyrolysis temperature on surface promotes the thermal stability of product effectively；；On the other hand, make polyurethane foam system surface compact degree
It is promoted, so that polyurethane foam surface translucency be effectively reduced, avoids ultraviolet light to the interference inside polyurethane foam, to make
The weatherability of product can be promoted；Furthermore the presence of cross-linked network structure effectively prevents the migration and loss of fire retardant,
Make product in the long-term use, good flame retardant property can be kept always；
(2) technical solution of the present invention is blended by using Corvic and polyurethane resin systems, in polyurethane structural
Carbonyl can form Hyarogen-bonding, and the introducing of polyvinyl chloride between the hydrogen atom of polyvinyl chloride methylene, can destroy this
The hydrogen bond of body polyurethane molecular inside configuration makes the hard section in the soft segment and polyvinyl chloride molecular structure in polyurethane molecular structure
It organically combines, the two compatibility is enable to be promoted, furthermore, the formation of new hydrogen bond cooperates the presence of above-mentioned cross-linked network structure,
So that the consistency of macromolecular network inside system is promoted, further avoids adverse effect of the photothermy to interiors of products
And the loss of the components such as internal ignition resistant agent, so that the weatherability of product and anti-flammability is kept for a long time.
Specific embodiment
According to parts by weight, 10~20 parts of polyvinyl chloride, 3~5 parts of plasticizer, 40~50 parts of tetrabutyl hydrogen sulfates are successively taken
Ammonium salt solution, 3~5 parts of vulcanized sodium, 40~50 parts of polyether polyol, 45~60 parts of isocyanates, 0.3~0.5 part of organotin, 0.6
~0.8 part of defoaming agent, 4~8 parts of fire retardants；First polyether polyol, organotin, defoaming agent, fire retardant and plasticizer are poured into instead
It answers in kettle, after being stirred 2~3h with blender with 600~800r/min revolving speed, adds isocyanates, continuing at revolving speed is
Under 800~1200r/min speed conditions, it is stirred to react 10~30s, obtains mixed liquor；By polyvinyl chloride, concentration be 0.1~
4-butyl ammonium hydrogen sulfate solution and the vulcanized sodium mixing of 0.2mol/L is poured into reactor, is 80~85 DEG C in temperature, stirring turns
Under the conditions of speed is 600~800r/min, after heating stirring reacts 3~5h, filtering obtains filter residue, and filter residue 3 is washed with deionized
~5 times, then by the filter residue vacuum freeze drying after washing, obtain dried feed；Gained mixed liquor and dried feed are poured into ball grinder again
In, and by ball material mass ratio be 10:1~40:1 be added zirconium oxide ball milling pearl, in rotational speed of ball-mill be 300~500r/min condition
Under, 10~30s of ball milling mixing, discharging obtains ball milling material；Again by gained ball milling material inject mold in, in temperature be 75~80 DEG C of items
After heat preservation stands 1~3h of curing under part, demoulding is cooling to get long-acting weather-proof flame retarded rigid polyurethane foams.The plasticizer
Any one for the positive zinc ester of phthalic acid two, in dibutyl phthalate or repefral.The polyethers
Polyalcohol is polyoxypropyleneglycol, any one in polyoxytetramethylene glycol or tetrahydrofuran-propylene oxide copolymer glycols
Kind.The isocyanates is toluene di-isocyanate(TDI), in methyl diphenylene diisocyanate or trimethylhexane diisocyanate
Any one.The organotin is that stannous octoate and dibutyl tin dilaurate are that 3:1~5:1 is compounded in mass ratio.
The defoaming agent is any one in dimethyl silicone polymer or polyoxypropylene ethylene oxide glycerin ether.The fire retardant is phosphorus
Any one in sour tributyl, tricresyl phosphate or methylene bromide.
According to parts by weight, 20 parts of polyvinyl chloride are successively taken, 5 parts of plasticizer, 50 parts of 4-butyl ammonium hydrogen sulfate solution, 5 parts
Vulcanized sodium, 50 parts of polyether polyol, 60 parts of isocyanates, 0.5 part of organotin, 0.8 part of defoaming agent, 8 parts of fire retardants；First by polyethers
Polyalcohol, organotin, defoaming agent, fire retardant and plasticizer pour into reaction kettle, are stirred and are mixed with 800r/min revolving speed with blender
After closing 3h, isocyanates is added, continuing at revolving speed is to be stirred to react 30s under 1200r/min speed conditions, obtain mixed liquor；It will
Polyvinyl chloride, the 4-butyl ammonium hydrogen sulfate solution that concentration is 0.2mol/L and vulcanized sodium mixing are poured into reactor, are in temperature
85 DEG C, under the conditions of speed of agitator is 800r/min, after heating stirring reacts 5h, filtering obtains filter residue, and filter is washed with deionized
Slag 5 times, then by the filter residue vacuum freeze drying after washing, obtain dried feed；Gained mixed liquor and dried feed are poured into ball grinder again
In, and be that zirconium oxide ball milling pearl is added in 40:1 by ball material mass ratio, under the conditions of rotational speed of ball-mill is 500r/min, ball milling mixing
30s, discharging, obtains ball milling material；Gained ball milling material is injected in mold again, heat preservation stands curing 3h under the conditions of being 80 DEG C in temperature
Afterwards, it demoulds, it is cooling to get long-acting weather-proof flame retarded rigid polyurethane foams.The plasticizer is the positive zinc ester of phthalic acid two.
The polyether polyol is polyoxypropyleneglycol.The isocyanates is toluene di-isocyanate(TDI).The organotin is octanoic acid
Stannous and dibutyl tin dilaurate are that 5:1 is compounded in mass ratio.The defoaming agent is dimethyl silicone polymer.The resistance
Combustion agent is tributyl phosphate.
According to parts by weight, 20 parts of polyvinyl chloride, 5 parts of plasticizer, 50 parts of polyether polyol, 60 parts of isocyanic acids are successively taken
Ester, 0.5 part of organotin, 0.8 part of defoaming agent, 8 parts of fire retardants；First by polyether polyol, organotin, defoaming agent, fire retardant and increasing
Modeling agent is poured into reaction kettle, after being stirred 3h with blender with 800r/min revolving speed, is added isocyanates, is continued at revolving speed
To be stirred to react 30s under 1200r/min speed conditions, mixed liquor is obtained；Gained mixed liquor and polyvinyl chloride are poured into ball grinder again
In, and be that zirconium oxide ball milling pearl is added in 40:1 by ball material mass ratio, under the conditions of rotational speed of ball-mill is 500r/min, ball milling mixing
30s, discharging, obtains ball milling material；Gained ball milling material is injected in mold again, heat preservation stands curing 3h under the conditions of being 80 DEG C in temperature
Afterwards, it demoulds, it is cooling to get long-acting weather-proof flame retarded rigid polyurethane foams.The plasticizer is the positive zinc ester of phthalic acid two.
The polyether polyol is polyoxypropyleneglycol.The isocyanates is toluene di-isocyanate(TDI).The organotin is octanoic acid
Stannous and dibutyl tin dilaurate are that 5:1 is compounded in mass ratio.The defoaming agent is dimethyl silicone polymer.The resistance
Combustion agent is tributyl phosphate.
According to parts by weight, 5 parts of plasticizer are successively taken, 50 parts of polyether polyol, 60 parts of isocyanates, 0.5 part of organotin,
0.8 part of defoaming agent, 8 parts of fire retardants；Polyether polyol, organotin, defoaming agent, fire retardant and plasticizer are first poured into reaction kettle
In, after being stirred 3h with blender with 800r/min revolving speed, isocyanates is added, revolving speed is continued at and turns for 1200r/min
Under the conditions of speed, it is stirred to react 30s, obtains mixed liquor；Gained mixed liquor is poured into ball grinder again, and is 40:1 by ball material mass ratio
Zirconium oxide ball milling pearl is added, under the conditions of rotational speed of ball-mill is 500r/min, ball milling mixing 30s, discharging obtains ball milling material；Again by institute
It obtains in ball milling material injection mold, after heat preservation standing cures 3h under the conditions of being 80 DEG C in temperature, demoulding is cooling to get long-acting weather-proof
Type flame retarded rigid polyurethane foams.The plasticizer is the positive zinc ester of phthalic acid two.The polyether polyol is polyoxygenated third
Enediol.The isocyanates is toluene di-isocyanate(TDI).The organotin is that stannous octoate and dibutyl tin dilaurate are pressed
Mass ratio is that 5:1 is compounded.The defoaming agent is dimethyl silicone polymer.The fire retardant is tributyl phosphate.
According to parts by weight, 20 parts of polyvinyl chloride are successively taken, 5 parts of plasticizer, 50 parts of 4-butyl ammonium hydrogen sulfate solution, 50 parts
Polyether polyol, 60 parts of isocyanates, 0.5 part of organotin, 0.8 part of defoaming agent, 8 parts of fire retardants；First by polyether polyol, organic
Tin, defoaming agent, fire retardant and plasticizer pour into reaction kettle, after being stirred 3h with blender with 800r/min revolving speed, then plus
Enter isocyanates, continuing at revolving speed is to be stirred to react 30s under 1200r/min speed conditions, obtain mixed liquor；By polyvinyl chloride, dense
Degree be 0.2mol/L 4-butyl ammonium hydrogen sulfate solution mixing pours into reactor, in temperature be 85 DEG C, speed of agitator 800r/
Under the conditions of min, after heating stirring reacts 5h, filtering obtains filter residue, and be washed with deionized filter residue 5 times, then by the filter after washing
Slag vacuum freeze drying, obtains dried feed；Gained mixed liquor and dried feed are poured into ball grinder again, and are by ball material mass ratio
Zirconium oxide ball milling pearl is added in 40:1, and under the conditions of rotational speed of ball-mill is 500r/min, ball milling mixing 30s, discharging obtains ball milling material；Again
Gained ball milling material is injected in mold, after heat preservation stands curing 3h under the conditions of being 80 DEG C in temperature, demoulding is cooling to get long-acting
Weather-proof flame retarded rigid polyurethane foams.The plasticizer is the positive zinc ester of phthalic acid two.The polyether polyol is polyoxy
Change propylene glycol.The isocyanates is toluene di-isocyanate(TDI).The organotin is stannous octoate and di lauric dibutyl
Tin is that 5:1 is compounded in mass ratio.The defoaming agent is dimethyl silicone polymer.The fire retardant is tributyl phosphate.
According to parts by weight, 20 parts of polyethylene, 5 parts of plasticizer, 50 parts of 4-butyl ammonium hydrogen sulfate solution, 5 parts of sulphur are successively taken
Change sodium, 50 parts of polyether polyol, 60 parts of isocyanates, 0.5 part of organotin, 0.8 part of defoaming agent, 8 parts of fire retardants；It is first that polyethers is more
First alcohol, organotin, defoaming agent, fire retardant and plasticizer pour into reaction kettle, are stirred with blender with 800r/min revolving speed
After 3h, isocyanates is added, continuing at revolving speed is to be stirred to react 30s under 1200r/min speed conditions, obtain mixed liquor；It will gather
Ethylene, concentration be 0.2mol/L 4-butyl ammonium hydrogen sulfate solution and vulcanized sodium mixing pour into reactor, in temperature be 85 DEG C,
Under the conditions of speed of agitator is 800r/min, after heating stirring reacts 5h, filtering obtains filter residue, and filter residue 5 is washed with deionized
It is secondary, then by the filter residue vacuum freeze drying after washing, obtain dried feed；Gained mixed liquor and dried feed are poured into ball grinder again,
And zirconium oxide ball milling pearl is added for 40:1 by ball material mass ratio, and under the conditions of rotational speed of ball-mill is 500r/min, ball milling mixing 30s,
Discharging, obtains ball milling material；Gained ball milling material is injected in mold again, after heat preservation stands curing 3h under the conditions of being 80 DEG C in temperature, is taken off
Mould, it is cooling to get long-acting weather-proof flame retarded rigid polyurethane foams.The plasticizer is the positive zinc ester of phthalic acid two.It is described
Polyether polyol is polyoxypropyleneglycol.The isocyanates is toluene di-isocyanate(TDI).The organotin is stannous octoate
It is in mass ratio that 5:1 is compounded with dibutyl tin dilaurate.The defoaming agent is dimethyl silicone polymer.The fire retardant
For tributyl phosphate.
Comparative example: the hard polyurethane foams of Nanjing heat insulating work Co., Ltd production.
1 to 5 gained hard polyurethane foams of example and comparative example product are subjected to performance detection, specific detection method is such as
Under:
Using HC-2C type oxygen index measurer, according to GB/T2406 detectable limit oxygen index (OI), sample having a size of 10mm × 10mm ×
120mm.After 3 months, its limit oxygen index is detected again.
Specific testing result is as shown in table 1:
Table 1: performance detection table
| Detection content | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example |
| Limit oxygen index/% | 34.6 | 29.2 | 28.5 | 30.4 | 30.6 | 24.8 |
| Limit oxygen index/% after 3 months | 34.4 | 24.3 | 23.4 | 26.5 | 25.9 | 17.0 |
By 1 testing result of table it is found that the long-acting weather-proof flame retarded rigid polyurethane foams of present invention gained have excellent anti-flammability
Energy and weatherability.
Claims (7)
1. a kind of long-acting weather-proof flame retarded rigid polyurethane foams, it is characterised in that the raw material including following parts by weight: 10~
20 parts of polyvinyl chloride, 3~5 parts of plasticizer, 40~50 parts of 4-butyl ammonium hydrogen sulfate solution, 3~5 parts of vulcanized sodium, 40~50 parts poly-
Ethoxylated polyhydric alcohol, 45~60 parts of isocyanates, 0.3~0.5 part of organotin, 0.6~0.8 part of defoaming agent, 4~8 parts of fire retardants；
The preparation process of the long-acting weather-proof flame retarded rigid polyurethane foams are as follows:
(1) after being first uniformly mixed polyether polyol, organotin, defoaming agent, fire retardant and plasticizer, isocyanic acid is added
Ester continues to be stirred to react, obtains mixed liquor；
(2) by after the reaction of polyvinyl chloride, 4-butyl ammonium hydrogen sulfate solution and vulcanized sodium heating stirring, drying obtains dried feed；
(3) it by after mixed liquor and dried feed ball milling mixing, injects in mold, heat preservation stands curing, demoulds to get long-acting weather-proof
Flame retarded rigid polyurethane foams.
2. the long-acting weather-proof flame retarded rigid polyurethane foams of one kind according to claim 1, it is characterised in that the plasticising
Agent is the positive zinc ester of phthalic acid two, any one in dibutyl phthalate or repefral.
3. the long-acting weather-proof flame retarded rigid polyurethane foams of one kind according to claim 1, it is characterised in that the polyethers
Polyalcohol is polyoxypropyleneglycol, any one in polyoxytetramethylene glycol or tetrahydrofuran-propylene oxide copolymer glycols
Kind.
4. the long-acting weather-proof flame retarded rigid polyurethane foams of one kind according to claim 1, it is characterised in that the isocyanide
Acid esters is toluene di-isocyanate(TDI), any one in methyl diphenylene diisocyanate or trimethylhexane diisocyanate.
5. the long-acting weather-proof flame retarded rigid polyurethane foams of one kind according to claim 1, it is characterised in that described organic
Tin is that stannous octoate and dibutyl tin dilaurate are that 3:1~5:1 is compounded in mass ratio.
6. the long-acting weather-proof flame retarded rigid polyurethane foams of one kind according to claim 1, it is characterised in that the defoaming
Agent is any one in dimethyl silicone polymer or polyoxypropylene ethylene oxide glycerin ether.
7. the long-acting weather-proof flame retarded rigid polyurethane foams of one kind according to claim 1, it is characterised in that described fire-retardant
Agent is tributyl phosphate, any one in tricresyl phosphate or methylene bromide.
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| CN111777814A (en) * | 2020-07-13 | 2020-10-16 | 安徽渡江电缆集团有限公司 | Environment-friendly weather-proof photovoltaic cable |
| CN111961327A (en) * | 2020-08-30 | 2020-11-20 | 宁波耀众模塑科技有限公司 | Flame-retardant polyurea material for polyurethane foaming product |
| CN114591529A (en) * | 2022-03-08 | 2022-06-07 | 青岛海容商用冷链股份有限公司 | Refrigerator heat preservation and insulation material and preparation method thereof |
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| CN114591529A (en) * | 2022-03-08 | 2022-06-07 | 青岛海容商用冷链股份有限公司 | Refrigerator heat preservation and insulation material and preparation method thereof |
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