CN110079034A - A kind of environment-friendly PVC sealing strip and preparation method thereof - Google Patents
A kind of environment-friendly PVC sealing strip and preparation method thereof Download PDFInfo
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- 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
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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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
- C08J2327/00—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
- C08J2327/02—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
- C08J2327/04—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
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/16—Ethene-propene or ethene-propene-diene copolymers
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K7/22—Expanded, porous or hollow particles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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Abstract
The present invention provides a kind of environmentally friendly lower shrinkage PVC sealing strip, the sealing strip includes PVC100 parts, 15-30 parts of ethylene propylene diene rubber, 80-100 parts of plasticizer, 8-18 parts of calcium carbonate, 8-16 parts of zinc oxide, 15-25 parts of carbon black, 6-10 parts of chlorinated paraffin, 5-8 parts of calcium zinc stabilizer, two 0.5-2 parts of benzene sulfonyl hydrazide ether foaming agents, 1-5 parts of fire retardant.The present invention improves the mechanical property and anti-contracility energy of sealing strip by reducing the content of VOC to unique technology controlling and process in sealing strip preparation process.
Description
Technical field
The invention belongs to sealing strip technical fields, and in particular to a kind of vehicle environment protection PVC sealing strip and preparation method thereof.
Background technique
" energy-saving and environmental protection, safely " be the eternal theme of development of automobile, and in-car air quality is as automobile environment-protection, safety
Importance will profoundly affect the purchase vehicle theory of consumer.The product of domestic automobile sealing strip industry production to its smell and
Volatile organic matter, which there is no, to be controlled, and checks that data exceed the requirement of national legislation standard, foreign matter is tight in compartment
Weight.Add deodorant or essence in formula currently, the manufacturer of sealing strip is only simple, also have progress subsequent thermal baking processing
Eliminate peculiar smell and organic volatile, this way often makes product odour strange, even more unpleasant.VOC is above-mentioned sealing strip
The low boiling point volatile small molecule organic compound that solvent or initiator residual or chemical reaction generate in preparation process, regardless of poison
Property size, is referred to as VOC, only from source, researches and develops, prepares, selecting low VOC (VOC) interior trim material
Material, could fundamentally solve interior VOC excessive problem.
Blending type polyvinyl chloride (PVC) thermoplastic elastomer (TPE) is easy with its excellent in mechanical performance, cost performance height, machine-shaping
And the advantages such as recyclable, it is widely used in the manufacture of the products such as automotive sealant, components.PVC sealing strip main ingredient is
Polyvinyl chloride, additionally incorporates the other compositions such as plasticizer to enhance its heat resistance, toughness, ductility etc., PVC sealing strip easily at
Type can be recycled, reusable.Plasticizer volatilization or exudation not only make interior VOC severe overweight that sealing strip also be made to lose its original
Some flexibilities become very stiff, and aging is shunk quickly, and length is shunk, and disconnected section is shunk, and leakproofness is caused to be deteriorated, because
This, is badly in need of exploitation novel environment protection PVC sealing strip system, reduces the spilling of its VOC, improve its comprehensive performance.Such as Chinese patent Shen
Numbers 2018113554028 it please disclose a kind of low VOC weather strip for automobile PVC material and preparation method thereof and adopt, using one kind by thunder
VOC remover made of the liquor potassic permanganate compounding that the sulfuric acid that Buddhist nun's nickel-base catalyst and concentration are 4% is acidified, by processing
Hydrotreating is carried out to VOC in confined space in the process, and then keeps its more volatile and removes.However, this method is not
Solve the problems, such as that the aging that it is used for a long time is shunk.
Summary of the invention
To solve the deficiencies in the prior art, the present invention provides a kind of environmentally friendly lower shrinkage PVC sealing strip and preparation method thereof.Tool
Body research approach is as follows:
A kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip includes PVC100 parts, 15-30 parts of ethylene propylene diene rubber, is increased
Agent 80-100 parts of modeling, 8-18 parts of calcium carbonate, 8-16 parts of zinc oxide, 15-25 parts of carbon black, 6-10 parts of chlorinated paraffin, calcium zinc stabilizer
5-8 parts, two 0.5-2 parts of benzene sulfonyl hydrazide ether foaming agents, 1-5 parts of fire retardant；
The PVC is commercially available PVC, and main model includes S-1000, S-1300, one of DH2500 or a variety of mixing
Object；
The ethylene propylene diene rubber is the composite crosslinking that the vulcanizing system being made of cumyl peroxide and sulphur is implemented
Body, the crosslinked can form fine and close hydrogen bond network with plasticiser system, preferably constraint plasticizer, its long-time is avoided to use
It is precipitated.On the other hand, which can also cooperatively form intensity height, bullet with the solid packings such as PVC parent and calcium carbonate, zinc oxide
The good complex of property, to reduce its shrinkage.
The plasticizer is polyester plasticizer, including polyadipate -1,2-PD ester, polyethylene glycol adipate, is gathered
One of adipic acid 1,3-PD ester or a variety of mixtures.On the one hand, the molecular weight of polyester plasticizer is larger, volatility
Low, migration is small, is not easy to be precipitated；On the other hand its ester group can be more likely formed hydrogen bond with the unsaturated hydrogen in ethylene propylene diene rubber,
Further increase its anti-precipitation performance and mechanical property；
Further, the preferred adipic acid of the polyester plasticizer -1,2-PD ester, due to containing a first in its structure
Base side chain, increases the gap of network, and then improves its telescopicing performance.
The calcium carbonate and zinc oxide need to be modified it with polyethylene acid esters before use, modified calcium carbonate and
The surface of Zinc oxide particles forms one layer of ester group functionalization layer, so that it is easier to the surface of insertion plasticizer and PVC, makes to have between interface
There is better adhesive effect, improves its fatigue performance.
The black grain diameter is 25~30nm, 80~100m of specific surface area2/ g, substandard carbon black are with higher resistance to
Grind effect.
The chlorinated paraffin includes chlorinated paraffin -42, chlorinated paraffin -52, one of chlorinated paraffin -70.Chlorinated paraffin
Plasticizer can be cooperatively formed with polyester plasticizer in formula, be easier to it using higher chlorine in chlorinated paraffin molecule
It is bonded in plasticizer and PVC, improves the mechanical property of sealing strip, and inhibit the precipitation of polyester plasticizer.
The fire retardant includes one of zinc borate, aluminium oxide, magnesia, cenosphere, feldspar in powder or a variety of
Mixture.Coating modification is carried out using Shi Xianyong chlorinated paraffin, on the one hand modified fire retardant surface has a large amount of chlorine member
Element, which can be preferably bonded with PVC and polyester plasticizer, improves mechanical property；On the other hand, in the chlorine element and fire retardant on surface
Metallic element forms metal chloride in burning, has the function of preferable isolating oxygen, improves its flame retardant effect.
The present invention also provides the preparation methods of the low environment-friendly PVC sealing strip, specifically comprise the following steps:
(1) surface of inorganic filler is modified: the inorganic filler includes calcium carbonate, zinc oxide and fire retardant, wherein carbonic acid
Calcium, zinc oxide acid polyethylene are ester modified, and fire retardant is modified with chlorinated paraffin；Concrete operations are to claim various fillers in mass ratio
It is added in high-speed kneading machine after amount after mediating 30-60min, 80-100 DEG C carries out heat treatment 1-3h.Herein sufficiently mediate be in order to
It is sufficiently mixed modifying agent with solid particle, the purpose of heat treatment is the internal layer for infiltrating modifying agent sufficiently to particle surface,
Improve surface adhesive strength.
(2) it is added after weighing above-mentioned various recipe ingredients in mass ratio in closed mixed at high speed kettle, high speed is mixed
Merge persistently overheating, when temperature reaches 80-90 DEG C, extraction kettle in generate VOC exhaust gas, take out VOC when keep vacuum degree-
0.08~-0.09MPa, it is ensured that the VOC inside mixture is also extracted, and the pumpdown time controls in 20-40min, works as vacuum pump
When Tail gas measuring VOC content is less than 1000ppm, vacuum pump is closed, supplements normal pressure in nitrogen to kettle.VOC is removed using high vacuum, is kept away
The use for having exempted from nickel-base catalyst keeps sealing strip more environmentally friendly.
(3) temperature in the kettle is continued to be increased to 110-120 DEG C, constant temperature stirs 30-50min, cools to 40-45 DEG C, obtains powder
Material.
(4) above-mentioned powder is added to dual-screw pelletizer, screw speed 10-15rmp, is squeezed by 120-135 DEG C of plasticization temperature
It is granulated to obtain pellet out.
(5) it in use, temperature of the pellet on sealing strip production line is 135-155 DEG C, by extrusion, traction, cooling, cuts
It cuts and automobile sealing strip is made.
Sealing strip prepared by the present invention, surface is smooth, has preferable pulling force and elastic force, anti-shrink and ageing properties
It is good, low VOC emission, without there are also Ni-based VOC scavengers, more environment-friendly and green.
Specific embodiment
The present invention will be further described with reference to the examples below, and described embodiment is only present invention a part
Embodiment.Based on the embodiment of the present invention, those skilled in the art replace in being equal of not making that creative work done
It changes or improves, all within protection scope of the present invention.Ethylene propylene diene rubber described in following embodiment is by peroxidating diisopropyl
The composite crosslinking body that the vulcanizing system of benzene and sulphur composition is implemented；The black grain diameter range is 25~30nm, specific surface area 80
~100m2It is no longer illustrated in/g, then specific embodiment.
Embodiment 1.
A kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip includes S-1000PVC100 parts, ethylene propylene diene rubber 18
Part, polyadipate -91 parts of 1,2-PD ester, 9 parts of calcium carbonate, 12 parts of zinc oxide, 20 parts of carbon black, 8 parts of chlorinated paraffin -52, calcium
7 parts of zinc stabilizer, two 1 part of benzene sulfonyl hydrazide ether foaming agents, 2.4 parts of zinc borate；
The sealing strip preparation method, specifically comprises the following steps:
(1) surface of inorganic filler is modified:
It is added in high-speed kneading machine after mediating 45min, turns after calcium carbonate and polyethylene acid esters 100:2 in mass ratio are weighed
Enter into air dry oven, 85 DEG C of heat preservation 2h, cool down to obtain modified calcium carbonate.
It is added in high-speed kneading machine after mediating 45min, turns after zinc oxide and polyethylene acid esters 100:2 in mass ratio are weighed
Enter into air dry oven, 90 DEG C of heat preservation 2h, cool down to obtain modified zinc oxide.
After zinc borate and chlorinated paraffin (dosage is not counted in chlorinated paraffin amount in formula herein) 100:2 in mass ratio are weighed
It is added in high-speed kneading machine after mediating 45min, is transferred in air dry oven, 80 DEG C of heat preservation 1h, cool down to obtain boric acid modification zinc.
(2) it after weighing modified calcium carbonate, zinc oxide, zinc borate and other components by formula composition, is added
Into closed mixed at high speed kettle, mixed at high speed and persistently overheating open vacuum pump when temperature reaches 80-90 DEG C, extract kettle out
The VOC exhaust gas of interior generation keeps vacuum degree in -0.08~-0.09MPa, when vacuum pump Tail gas measuring VOC content is small when taking out VOC
When 1000ppm, vacuum pump is closed, supplements normal pressure in nitrogen to kettle.
(3) temperature in the kettle is continued to be increased to 110-120 DEG C, constant temperature stirs 35min, cools to 40-45 DEG C, obtains powder.
(4) above-mentioned powder is added to dual-screw pelletizer, screw speed 10-15rmp, is squeezed by 120-135 DEG C of plasticization temperature
It is granulated to obtain pellet out.
(5) preparation of sealing strip: temperature of the pellet on sealing strip production line be 135-155 DEG C, by extrusion, traction,
Cooling is cut into automobile sealing strip.
Embodiment 2.
A kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip include 100 parts of S-1000, and 22 parts of ethylene propylene diene rubber,
88 parts of polyethylene glycol adipate, 13 parts of calcium carbonate, 13 parts of zinc oxide, 21 parts of carbon black, 8 parts of chlorinated paraffin -52, calcium zinc is stablized
6 parts of agent, two 0.8 part of benzene sulfonyl hydrazide ether foaming agents, 3 parts of cenosphere；
The preparation method is the same as that of Example 1, and wherein the surface modification temperature of cenosphere is 100 DEG C, heat treatment time 3h, with
Infiltrate chlorinated paraffin sufficiently to bead surface.
Embodiment 3
A kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip includes PVC100 parts of S-1300 type, ethylene propylene diene rubber 23
Part, adipic acid -84 parts of 1,2-PD ester, 17 parts of calcium carbonate, 15 parts of zinc oxide, 21 parts of carbon black, 8 parts of chlorinated paraffin -52, calcium
8 parts of zinc stabilizer, two 0.8 part of benzene sulfonyl hydrazide ether foaming agents, 2.4 parts of zinc borate flame retardant；
The preparation method is the same as that of Example 1.
Embodiment 4
A kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip includes PVC100 parts of DH2500 type, ethylene propylene diene rubber 27
Part, 92 parts of polyadipate 1,3-PD ester, 13 parts of calcium carbonate, 13 parts of zinc oxide, 18 parts of carbon black, 7 parts of chlorinated paraffin -42 type,
8 parts of calcium zinc stabilizer, two 0.8 part of benzene sulfonyl hydrazide ether foaming agents, 3 parts of feldspar in powder；
The preparation method is the same as that of Example 1, and wherein the modification temperature of feldspar in powder is 90 DEG C, heat treatment time 2h.
Embodiment 5
A kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip includes PVC100 parts of S-1300 type, ethylene propylene diene rubber 24
Part, including polyadipate -80-100 parts of 1,3-PD ester, 13 parts of calcium carbonate, 13 parts of zinc oxide, 28 parts of carbon black, chlorinated paraffin -
70 6 parts of types, 7 parts of calcium zinc stabilizer, two 1.2 parts of benzene sulfonyl hydrazide ether foaming agents, 2.4 parts of zinc borate flame retardant；
The preparation method is the same as that of Example 1
Sealing strip prepared in the above embodiments carries out tensile strength and hardness test respectively, and wherein extension test uses GB/
T1040.2-2006 " the measurement part 2 of plastic tensile performance: the experimental condition of molding and extrusion molding plastics " is carried out, hardness test
It is carried out using GB/T2411-2006 " plastics and hard rubber use hardometer measurement identation hardness (shore hardness) ", compression is permanent
Deformation according to GB/T 7759-1996 " vulcanized rubber or the measurement part 1 of thermoplastic elastomer compression set: in room temperature and
Under hot conditions " 100 DEG C, 72h, compression ratio 25%.Specific test result is as follows table:
1. environment-friendly PVC sealing strip performance of table
Above data shows that sealing strip prepared by the present invention has stronger mechanical property and non-deformability.More than
Described is only presently preferred embodiments of the present invention, is not intended to limit the invention, all within the spirits and principles of the present invention, is made
Any modification, equivalent substitution, improvement and etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of environmental protection lower shrinkage PVC sealing strip, the sealing strip includes PVC100 parts, 15-30 parts of ethylene propylene diene rubber, plasticising
80-100 parts of agent, 8-18 parts of calcium carbonate, 8-16 parts of zinc oxide, 15-25 parts of carbon black, 6-10 parts of chlorinated paraffin, calcium zinc stabilizer 5-8
Part, two 0.5-2 parts of benzene sulfonyl hydrazide ether foaming agents, 1-5 parts of fire retardant；It is characterized in that, the ethylene propylene diene rubber is by peroxide
Change the composite crosslinking body of the vulcanizing system implementation of diisopropylbenzene (DIPB) and sulphur composition.
2. a kind of environmentally friendly lower shrinkage PVC sealing strip according to claim 1, which is characterized in that the plasticizer is polyester increasing
Mould agent, including polyadipate -1,2-PD ester, polyethylene glycol adipate, one of polyadipate 1,3-PD ester
Or a variety of mixture.
3. a kind of environmentally friendly lower shrinkage PVC sealing strip according to claim 1, which is characterized in that the calcium carbonate and zinc oxide
It needs to be modified it with polyethylene acid esters before use.
4. a kind of environmentally friendly lower shrinkage PVC sealing strip according to claim 1, which is characterized in that the black grain diameter is 25~
30nm, 80~100m of specific surface area2/g。
5. a kind of environmentally friendly lower shrinkage PVC sealing strip according to claim 1, which is characterized in that the chlorinated paraffin includes chlorine
Fossil waxes -42, chlorinated paraffin -52, one of chlorinated paraffin -70.
6. a kind of environmentally friendly lower shrinkage PVC sealing strip according to claim 1, which is characterized in that the fire retardant includes boric acid
One of zinc, aluminium oxide, magnesia, cenosphere, feldspar in powder or a variety of mixtures.
7. a kind of preparation method of environmentally friendly lower shrinkage PVC sealing strip of any of claims 1-6, specifically includes as follows
Step:
(1) surface of inorganic filler is modified: the inorganic filler includes calcium carbonate, zinc oxide and fire retardant, wherein calcium carbonate, oxygen
It is ester modified to change zinc acid polyethylene, fire retardant is modified with chlorinated paraffin；Concrete operations are after weighing various fillers in mass ratio
It is added in high-speed kneading machine after mediating 30-60min, 80-100 DEG C carries out heat treatment 1-3h；
(2) it is added after weighing above-mentioned various recipe ingredients in mass ratio in closed mixed at high speed kettle, mixed at high speed is simultaneously
Persistently overheating, when temperature reaches 80-90 DEG C, the VOC exhaust gas generated in extraction kettle keeps vacuum degree -0.08 when taking out VOC
~-0.09MPa, it is ensured that the VOC inside mixture is also extracted, and the pumpdown time controls in 20-40min, works as tail gas of vacuum gas pump
When detecting VOC content less than 1000ppm, vacuum pump is closed, supplements normal pressure in nitrogen to kettle；
(3) temperature in the kettle is continued to be increased to 110-120 DEG C, constant temperature stirs 30-50min, cools to 40-45 DEG C, obtains powder；
(4) above-mentioned powder is added to dual-screw pelletizer, screw speed 10-15rmp, 120-135 DEG C of plasticization temperature, extrusion is made
Grain obtains pellet；
(5) it in use, temperature of the pellet on sealing strip production line is 135-155 DEG C, is made by extrusion, traction, cooling, cutting
At automobile sealing strip.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112920766A (en) * | 2021-01-30 | 2021-06-08 | 高时(厦门)石业有限公司 | Two-component antibacterial silicone sealant and preparation method thereof |
| CN113150470A (en) * | 2021-05-17 | 2021-07-23 | 湖北合扬科技有限公司 | Low-density high-extrusion-rate PVC fireproof sealing strip and preparation method thereof |
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