CN111073083A - Wear-resistant plastic track and preparation method thereof - Google Patents
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
- E01C13/06—Pavings made in situ, e.g. for sand grounds, clay courts E01C13/003
- E01C13/065—Pavings made in situ, e.g. for sand grounds, clay courts E01C13/003 at least one in situ layer consisting of or including bitumen, rubber or plastics
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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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
- C08K5/3437—Six-membered rings condensed with carbocyclic rings
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention discloses a wear-resistant plastic track and a preparation method thereof in the technical field related to plastic tracks, and the wear-resistant plastic track comprises a bottom layer, a middle layer and a surface layer which are arranged from bottom to top in sequence; the bottom layer comprises the following components: rubber and copper 8-hydroxyquinoline; the intermediate layer comprises the following components: polyether polyol, dioctyl phthalate, polyisocyanate, diphenylmethane diisocyanate, azodicarbonamide, polyurethane vulcanizing agent, filler, graphene, plasticizer, stabilizer and catalyst; the surface layer comprises the following components: polyether polyol, polyvinyl alcohol, dioctyl phthalate, polyisocyanate, diphenylmethane diisocyanate, azodicarbonamide, silicone powder, epoxidized soybean oil, a polyurethane vulcanizing agent, a filler, graphene, a plasticizer, a stabilizer, a catalyst, an anti-aging agent, a zinc borate flame retardant, an anti-skid auxiliary and a pigment; the plastic track has good wear resistance and scratch resistance due to the filler, the anti-aging agent and the graphene, and is more stable in chemical property.
Description
Technical Field
The invention relates to the technical field of plastic runways, in particular to a wear-resistant plastic runway and a preparation method thereof.
Background
The plastic track has the characteristics of good flatness, high compressive strength, proper hardness and elasticity, stable physical performance and the like, is favorable for exerting the speed and the technology of the sportsman, effectively improves the sports performance and reduces the tumble injury rate. Along with the development of the national fitness, plastic runways are laid in middle and primary schools and sports stadiums more and more, and the utilization rate of the plastic runways is higher and higher along with the development of the national fitness.
In schools and sports stadiums, people often wear the plastic track when doing sports on the plastic track, and especially in middle and primary schools, the number of people doing sports is large, or in sports stadiums, the requirement on the wear resistance of the plastic track is high. Therefore, the wear-resistant plastic track is developed and has a great effect on the prior art.
Disclosure of Invention
Aiming at the technical problem of high requirement on the wear resistance of the plastic track in the prior art, the invention provides a wear-resistant plastic track and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a wear-resistant plastic track comprises a bottom layer, a middle layer and a surface layer which are arranged from bottom to top in sequence; the bottom layer comprises the following components in parts by weight: 40-50 parts of rubber and 3-5 parts of 8-hydroxyquinoline copper; the middle layer comprises the following components in parts by weight: 90-120 parts of polyether polyol, 40-50 parts of dioctyl phthalate, 20-30 parts of polyisocyanate, 20-30 parts of diphenylmethane diisocyanate, 10-15 parts of azodicarbonamide, 2-4 parts of polyurethane vulcanizing agent, 10-15 parts of filler, 15-20 parts of graphene, 20-30 parts of plasticizer, 3-7 parts of stabilizer and 1-3 parts of catalyst; the surface layer comprises the following components in parts by weight: 60-80 parts of polyether polyol, 10-20 parts of polyvinyl alcohol, 30-40 parts of dioctyl phthalate, 25-35 parts of polyisocyanate, 20-30 parts of diphenylmethane diisocyanate, 10-20 parts of azodicarbonamide, 3-5 parts of silicone powder, 3-5 parts of epoxidized soybean oil, 5-8 parts of polyurethane vulcanizing agent, 15-20 parts of filler, 10-16 parts of graphene, 15-30 parts of plasticizer, 5-10 parts of stabilizer, 1-2 parts of catalyst, 0.5-1 part of anti-aging agent, 0.5-1 part of zinc borate flame retardant, 5-10 parts of anti-skid auxiliary agent and 3-4 parts of pigment.
Preferably, the rubber is one or more of styrene butadiene rubber, ethylene propylene rubber and natural rubber.
Preferably, the polyether polyol is one or more of polyoxypropylene diol, polytetrahydrofuran diol, polyoxyethylene diol and polyoxyethylene triol.
Preferably, the catalyst is potassium oleate or dimorpholinodiethyl ether.
Preferably, the filler is one or more of barite powder, gypsum, kaolin, nano calcium carbonate and talcum powder.
Preferably, the anti-aging agent is N, N-diphenyl-p-phenylenediamine or microcrystalline wax.
Preferably, the stabilizer is one or more of dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate, half maleate and non-sulfur organic tin.
A preparation method of the wear-resistant plastic track comprises the following steps:
s1) preparation of the bottom layer:
accurately weighing the rubber and the 8-hydroxyquinoline copper, fully mixing, heating and melting, and pouring the mixture to a site needing construction of the wear-resistant plastic track to obtain the bottom layer;
s2) preparation of the intermediate layer:
s21) accurately weighing the polyether polyol as a first component according to the material of the middle layer;
accurately weighing the dioctyl phthalate, the polyisocyanate, the diphenylmethane diisocyanate, the azodicarbonamide, the polyurethane vulcanizing agent, the filler, the graphene, the plasticizer, the stabilizer and the catalyst according to the material of the intermediate layer, and fully mixing to obtain a second component;
s22) putting the first component into a reaction kettle, dehydrating for 45-60 min under the negative pressure condition of 100-110 ℃, then cooling to 35-40 ℃, adding the second component, stirring for 10-30 min, then heating to 110-120 ℃, stirring for reacting for 2-3 h, and then pouring the mixture above the bottom layer prepared in S1) to obtain the middle layer;
s3) preparing the surface layer:
s31) accurately weighing the polyether polyol and the polyvinyl alcohol according to the material of the surface layer and fully mixing to obtain a third component;
accurately weighing the dioctyl phthalate, the polyisocyanate, the diphenylmethane diisocyanate, the azodicarbonamide, the silicone powder, the epoxidized soybean oil, the polyurethane vulcanizing agent, the filler, the graphene, the plasticizer, the stabilizer, the catalyst, the anti-aging agent, the zinc borate flame retardant, the anti-skid auxiliary agent and the pigment according to the material of the surface layer, and fully mixing to obtain a fourth component;
s32) putting the third component into a reaction kettle, dehydrating for 45-60 min under the negative pressure condition of 100-110 ℃, then cooling to 35-40 ℃, adding the fourth component, stirring for 10-30 min, then heating to 110-120 ℃, stirring for reacting for 2-3 h, and then pouring on the middle layer prepared in S22) to obtain the wear-resistant plastic track after the middle layer is solidified.
The invention has the following advantages:
1. according to the invention, the polymerization structure of the plastic track is modified through the lamellar conjugated structure of the graphene, so that the modified polymer has good performances in the aspects of wear resistance and scratch resistance, and the chemical performance of the plastic track is more stable;
2. the plastic track is more wear-resistant due to the selection and the proportion of the filler;
3. the anti-aging agent effectively delays the aging of the plastic track and also has better wear resistance to a certain extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure of the present invention.
In the figure, 1-bottom layer; 2-an intermediate layer; and 3-surface layer.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto; in addition, in the embodiments, experimental means commonly used in the present invention and the prior art are not described in order to highlight the distinguishing technical features of the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It should be noted that in the description of the present invention, the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the description of the structure of the present invention shown in fig. 1, and are only for the convenience of describing the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the technical scheme, "first" and "second" are only used to refer to and distinguish identical or similar structures or corresponding structures with similar functions, and are not used to arrange the importance of the structures, nor have any ordering, or comparative sizes or other meanings.
The preparation embodiment of the wear-resistant plastic track comprises the following steps:
example 1
S1) preparation of bottom layer 1:
accurately weighing 40 parts of styrene butadiene rubber and 3 parts of 8-hydroxyquinoline copper according to parts by weight, fully mixing, heating and melting, and pouring the mixture to a site needing construction of the wear-resistant plastic track to obtain a bottom layer 1;
s2) preparation of intermediate layer 2:
s21) accurately weighing 90 parts of polyoxypropylene glycol as a first component according to parts by weight;
accurately weighing 40 parts of dioctyl phthalate, 20 parts of polyisocyanate, 20 parts of diphenylmethane diisocyanate, 10 parts of azodicarbonamide, 2 parts of polyurethane vulcanizing agent, 10 parts of barite powder, 15 parts of graphene, 20 parts of plasticizer, 3 parts of dibasic lead stearate and 1 part of potassium oleate according to parts by weight, and fully mixing to obtain a second component;
s22) putting the first component into a reaction kettle, dehydrating for 45min under the negative pressure condition of 100 ℃, then cooling to 35 ℃, adding the second component, stirring for 10min, then heating to 110 ℃, stirring for reaction for 2h, and then pouring the mixture above the bottom layer 1 prepared in S1) to obtain an intermediate layer 2;
s3) preparation of the surface layer 3:
s31) accurately weighing 60 parts of polyoxypropylene glycol and 10 parts of polyvinyl alcohol according to the parts by weight, and fully mixing to obtain a third component;
accurately weighing 30 parts of dioctyl phthalate, 25 parts of polyisocyanate, 20 parts of diphenylmethane diisocyanate, 10 parts of azodicarbonamide, 3 parts of silicone powder, 3 parts of epoxidized soybean oil, 5 parts of polyurethane vulcanizing agent, 15 parts of barite powder, 10 parts of graphene, 15 parts of plasticizer, 5 parts of dibasic lead stearate, 1 part of potassium oleate, 0.5 part of N, N-diphenyl-p-phenylenediamine, 0.5 part of zinc borate flame retardant, 5 parts of anti-skid additive and 3 parts of pigment according to parts by weight, and fully mixing to obtain a fourth component;
s32) putting the third component into a reaction kettle, dehydrating for 45min under the negative pressure condition of 100 ℃, then cooling to 35 ℃, adding the fourth component, stirring for 10min, then heating to 110 ℃, stirring for reaction for 2h, and then pouring the mixture above the intermediate layer 2 prepared in S22) for solidification to obtain the wear-resistant plastic track shown in the figure 1, wherein the wear-resistant plastic track comprises a bottom layer 1, the intermediate layer 2 and a surface layer 3 which are sequentially arranged from bottom to top.
Detecting the wear-resisting effect according to Shore A type hardness GB/T531-1999, and detecting that the Shore A type hardness is 74 degrees; the compression recovery rate is 99% according to GB/T14833-93.
Example 2
S1) preparation of bottom layer 1:
accurately weighing 45 parts of ethylene propylene rubber and 4 parts of 8-hydroxyquinoline copper according to parts by weight, fully mixing, heating and melting, and pouring the mixture to a site needing construction of the wear-resistant plastic track to obtain a bottom layer 1;
s2) preparation of intermediate layer 2:
s21) accurately weighing 100 parts of polytetrahydrofuran diol by weight as a first component;
accurately weighing 45 parts of dioctyl phthalate, 25 parts of polyisocyanate, 25 parts of diphenylmethane diisocyanate, 13 parts of azodicarbonamide, 3 parts of polyurethane vulcanizing agent, 13 parts of gypsum, 18 parts of graphene, 25 parts of plasticizer, 5 parts of maleic acid half ester and 2 parts of dimorpholinyl diethyl ether according to parts by weight, and fully mixing to obtain a second component;
s22) putting the first component into a reaction kettle, dehydrating for 50min under the negative pressure condition of 105 ℃, then cooling to 38 ℃, adding the second component, stirring for 20min, then heating to 115 ℃, stirring for reacting for 2.5h, and then pouring the mixture above the bottom layer 1 prepared in S1) to obtain an intermediate layer 2;
s3) preparation of the surface layer 3:
s31) accurately weighing 70 parts of polytetrahydrofuran diol and 15 parts of polyvinyl alcohol according to the parts by weight, and fully mixing to obtain a third component;
accurately weighing 35 parts of dioctyl phthalate, 30 parts of polyisocyanate, 25 parts of diphenylmethane diisocyanate, 15 parts of azodicarbonamide, 4 parts of silicone powder, 4 parts of epoxidized soybean oil, 7 parts of polyurethane vulcanizing agent, 18 parts of gypsum, 13 parts of graphene, 22 parts of plasticizer, 8 parts of maleic acid half ester, 1.5 parts of dimorpholinodiethyl ether, 0.8 part of microcrystalline wax, 0.8 part of zinc borate flame retardant, 8 parts of anti-skid auxiliary agent and 3.5 parts of pigment according to parts by weight, and fully mixing to obtain a fourth component;
s32) putting the third component into a reaction kettle, dehydrating for 50min under the negative pressure condition of 105 ℃, then cooling to 38 ℃, adding the fourth component, stirring for 20min, then heating to 115 ℃, stirring for reacting for 2.5h, and then pouring the mixture above the middle layer 2 prepared in S22) for solidification to obtain the wear-resistant plastic track shown in the figure 1, wherein the wear-resistant plastic track comprises a bottom layer 1, the middle layer 2 and a surface layer 3 which are sequentially arranged from bottom to top.
Detecting the wear-resisting effect according to Shore A type hardness GB/T531-1999, and detecting that the Shore A type hardness is 75 degrees; the compression recovery rate is 99% according to GB/T14833-93.
Example 3
S1) preparation of bottom layer 1:
accurately weighing 50 parts of natural rubber and 5 parts of 8-hydroxyquinoline copper according to parts by weight, fully mixing, heating and melting, and pouring the mixture to a site needing construction of the wear-resistant plastic track to obtain a bottom layer 1;
s2) preparation of intermediate layer 2:
s21) accurately weighing 120 parts of polyoxyethylene glycol as a first component according to parts by weight;
accurately weighing 50 parts of dioctyl phthalate, 30 parts of polyisocyanate, 30 parts of diphenylmethane diisocyanate, 15 parts of azodicarbonamide, 4 parts of polyurethane vulcanizing agent, 15 parts of kaolin, 20 parts of graphene, 30 parts of plasticizer, 7 parts of non-sulfur organic tin and 3 parts of dimorpholinyl diethyl ether according to parts by weight, and fully mixing to obtain a second component;
s22) putting the first component into a reaction kettle, dehydrating for 60min under the negative pressure condition of 110 ℃, then cooling to 40 ℃, adding the second component, stirring for 30min, then heating to 120 ℃, stirring for reacting for 3h, and then pouring the mixture above the bottom layer 1 prepared in S1) to obtain an intermediate layer 2;
s3) preparation of the surface layer 3:
s31) accurately weighing 80 parts of polyoxyethylene glycol and 20 parts of polyvinyl alcohol according to the parts by weight, and fully mixing to obtain a third component;
accurately weighing 40 parts of dioctyl phthalate, 35 parts of polyisocyanate, 30 parts of diphenylmethane diisocyanate, 20 parts of azodicarbonamide, 5 parts of silicone powder, 5 parts of epoxidized soybean oil, 8 parts of polyurethane vulcanizing agent, 20 parts of kaolin, 16 parts of graphene, 30 parts of plasticizer, 10 parts of non-sulfur organic tin, 2 parts of dimorpholinodiethyl ether, 1 part of N, N-diphenyl-p-phenylenediamine, 1 part of zinc borate flame retardant, 10 parts of anti-slip additive and 4 parts of pigment according to parts by weight, and fully mixing to obtain a fourth component;
s32) putting the third component into a reaction kettle, dehydrating for 60min under the negative pressure condition of 110 ℃, then cooling to 40 ℃, adding the fourth component, stirring for 30min, then heating to 120 ℃, stirring for reaction for 3h, and then pouring the mixture above the intermediate layer 2 prepared in S22) for solidification to obtain the wear-resistant plastic track shown in the figure 1, wherein the wear-resistant plastic track comprises a bottom layer 1, the intermediate layer 2 and a surface layer 3 which are sequentially arranged from bottom to top.
Detecting the wear-resisting effect according to Shore A type hardness GB/T531-1999, and detecting that the Shore A type hardness is 75 degrees; the compression recovery rate is 99% according to GB/T14833-93.
In specific implementation, the polyether polyol in the above embodiment may also be polyoxyethylene triol; the filler can also be nano calcium carbonate or talcum powder; the dibasic lead stearate may also be replaced by hydrated tribasic lead sulfate or dibasic lead phthalate.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are within the scope of the invention.
Claims (8)
1. A wear-resisting plastic course which characterized in that: comprises a bottom layer, a middle layer and a surface layer which are arranged from bottom to top in sequence; the bottom layer comprises the following components in parts by weight: 40-50 parts of rubber and 3-5 parts of 8-hydroxyquinoline copper; the intermediate layer comprises the following components in parts by weight: 90-120 parts of polyether polyol, 40-50 parts of dioctyl phthalate, 20-30 parts of polyisocyanate, 20-30 parts of diphenylmethane diisocyanate, 10-15 parts of azodicarbonamide, 2-4 parts of polyurethane vulcanizing agent, 10-15 parts of filler, 15-20 parts of graphene, 20-30 parts of plasticizer, 3-7 parts of stabilizer and 1-3 parts of catalyst; the surface layer comprises the following components in parts by weight: 60-80 parts of polyether polyol, 10-20 parts of polyvinyl alcohol, 30-40 parts of dioctyl phthalate, 25-35 parts of polyisocyanate, 20-30 parts of diphenylmethane diisocyanate, 10-20 parts of azodicarbonamide, 3-5 parts of silicone powder, 3-5 parts of epoxidized soybean oil, 5-8 parts of polyurethane vulcanizing agent, 15-20 parts of filler, 10-16 parts of graphene, 15-30 parts of plasticizer, 5-10 parts of stabilizer, 1-2 parts of catalyst, 0.5-1 part of anti-aging agent, 0.5-1 part of zinc borate flame retardant, 5-10 parts of anti-skid auxiliary agent and 3-4 parts of pigment.
2. A wear-resistant plastic runway according to claim 1, characterized in that: the rubber is one or more of styrene butadiene rubber, ethylene propylene rubber and natural rubber.
3. A wear-resistant plastic runway according to claim 1, characterized in that: the polyether polyol is one or more of polyoxypropylene diol, polytetrahydrofuran diol, polyoxyethylene diol and polyoxyethylene triol.
4. A wear-resistant plastic runway according to claim 1, characterized in that: the catalyst is potassium oleate or dimorpholinyl diethyl ether.
5. A wear-resistant plastic runway according to claim 1, characterized in that: the filler is one or more of barite powder, gypsum, kaolin, nano calcium carbonate and talcum powder.
6. A wear-resistant plastic runway according to claim 1, characterized in that: the anti-aging agent is N, N-diphenyl-p-phenylenediamine or microcrystalline wax.
7. A wear-resistant plastic runway according to claim 1, characterized in that: the stabilizer is one or more of dibasic lead stearate, hydrated tribasic lead sulfate, dibasic lead phthalate, maleic acid half-ester and non-sulfur organic tin.
8. A method for preparing a wear-resistant plastic track as claimed in any one of claims 1 to 7, characterized in that: the method comprises the following steps:
s1) preparation of the bottom layer:
accurately weighing the rubber and the 8-hydroxyquinoline copper, fully mixing, heating and melting, and pouring the mixture to a site needing construction of the wear-resistant plastic track to obtain the bottom layer;
s2) preparation of the intermediate layer:
s21) accurately weighing the polyether polyol as a first component according to the material of the middle layer;
accurately weighing the dioctyl phthalate, the polyisocyanate, the diphenylmethane diisocyanate, the azodicarbonamide, the polyurethane vulcanizing agent, the filler, the graphene, the plasticizer, the stabilizer and the catalyst according to the material of the middle layer, and fully mixing to obtain a second component;
s22) putting the first component into a reaction kettle, dehydrating for 45-60 min under the negative pressure condition of 100-110 ℃, then cooling to 35-40 ℃, adding the second component, stirring for 10-30 min, then heating to 110-120 ℃, stirring for reacting for 2-3 h, and then pouring on the bottom layer prepared in S1) to obtain the middle layer;
s3) preparing the surface layer:
s31) accurately weighing the polyether polyol and the polyvinyl alcohol according to the material of the surface layer and fully mixing to obtain a third component;
accurately weighing the dioctyl phthalate, the polyisocyanate, the diphenylmethane diisocyanate, the azodicarbonamide, the silicone powder, the epoxidized soybean oil, the polyurethane vulcanizing agent, the filler, the graphene, the plasticizer, the stabilizer, the catalyst, the anti-aging agent, the zinc borate flame retardant, the anti-skid auxiliary agent and the pigment according to the material of the surface layer, and fully mixing to obtain a fourth component;
s32) putting the third component into a reaction kettle, dehydrating for 45-60 min under the negative pressure condition of 100-110 ℃, cooling to 35-40 ℃, adding the fourth component, stirring for 10-30 min, heating to 110-120 ℃, stirring for reacting for 2-3 h, and pouring on the middle layer prepared in S22) to obtain the wear-resistant plastic track after solidification.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113831830A (en) * | 2021-09-28 | 2021-12-24 | 江苏图研新材料科技有限公司 | High-barrier polyurethane self-repairing composition and preparation method thereof |
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Application publication date: 20200428 |