CN110540627A - Polyurethane foam, preparation method and application in automobile headrest - Google Patents
Polyurethane foam, preparation method and application in automobile headrest Download PDFInfo
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- CN110540627A CN110540627A CN201910812453.7A CN201910812453A CN110540627A CN 110540627 A CN110540627 A CN 110540627A CN 201910812453 A CN201910812453 A CN 201910812453A CN 110540627 A CN110540627 A CN 110540627A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/80—Head-rests
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4072—Mixtures of compounds of group C08G18/63 with other macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
- C08G18/4845—Polyethers containing oxyethylene units and other oxyalkylene units containing oxypropylene or higher oxyalkylene end groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
- C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses polyurethane foam which is prepared from a component A and a component B through a foaming process, wherein the component A comprises the following raw materials in parts by weight: 50-80 parts of propylene oxide and ethylene oxide copolyether with the hydroxyl value of 32-38 mgKOH/g by taking glycerol as an initiator; 10-35 parts of polymer polyol with the hydroxyl value of 25-30 mgKOH/g; 1.5-5 parts of water; 0.5-1.5 parts of a catalyst; 2-12 parts of an auxiliary agent; the component B is isocyanate. The polyurethane high-resilience foam composition disclosed by the invention has the advantage of high strength, the compression strength can reach more than 5.5KPa, the resilience can reach more than 50%, the standard requirements of toxic and harmful substances specified in GB/T27630-2011' guidelines for evaluating air quality in passenger cars are met, the VOC content is low, the sound absorption effect is good, and the polyurethane composition is very suitable for automotive interior headrests.
Description
Technical Field
the invention belongs to the field of chemical materials, and particularly relates to polyurethane foam, a preparation method and application thereof in an automobile headrest.
Background
The automobile headrest is a driving comfort configuration article and a safety protection article. With the gradual improvement of living standard, people pay more attention to the automobile headrest, and the focus of the attention gradually changes from the appearance to the comfort level and the environmental protection direction, and the polyurethane high-resilience soft foam has wider application prospect in the aspects of vibration reduction, comfort, energy absorption and the like. Meanwhile, the volatilization of low molecular substances of polyurethane foam and volatile harmful gas generated in the production process of the low molecular substances are important aspects influencing the environmental protection and clean production of the polyurethane foam, and in order to improve the production environment and improve the driving experience, the automobile headrest with excellent performances such as excellent resilience, low VOC and low odor is greatly required to be developed in the market.
CN107082865A discloses a fragrant high resilience polyurethane molded foam and a preparation method thereof, the fragrant high resilience polyurethane molded foam is prepared by combining raw materials A and B, the addition ratio of the raw materials A to B is about 2: 1 according to the mass ratio, wherein, the component A comprises polyether glycol, polymer polyol, a cross-linking agent, a catalyst, a surfactant, water and liquid essence; the component B is isocyanate. The VOC and physical properties of this patent are within the control requirements, but the compressive hardness is only 5.3 KPa.
Disclosure of Invention
The invention aims to provide polyurethane foam with good bearing performance and rebound resilience, a preparation method and application in automobile headrests.
In order to achieve the above object, the first aspect of the present invention provides a polyurethane foam prepared by a foaming process from a component A and a component B,
The component A comprises the following raw materials in parts by weight:
The component B is isocyanate.
Preferably, the component A comprises the following raw materials in parts by weight:
Preferably, the feeding mass ratio of the component A to the component B is 1.7-2.9: 1.
Further preferably, the feeding mass ratio of the component A to the component B is 1.7-2: 1.
Preferably, the catalyst is amine reaction type catalyst, preferably 2-hydroxy-N, N, N-trimethyl-1-propylamine formate, tetramethyl dipropylenetriamine, dimethylethanolamine, triethylamine, N, N-dimethylbenzylamine, triethanolamine, diisopropanolamine, triethylenediamine, trimethyl hydroxyethyl bisaminoethyl ether, or one or more mixtures of quaternary ammonium salts.
preferably, the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate.
Further preferably, the feeding mass ratio of the diphenylmethane diisocyanate to the polyphenyl polymethylene polyisocyanate is 1-4: 1.
preferably, the auxiliary agent is one or more of a surfactant, a cell opener and an antioxidant.
More preferably, the addition mass of the surfactant is 0.1-1 part; the addition mass of the pore-forming agent is 0.5-5 parts; the addition mass of the antioxidant is 2-6 parts.
In the present invention, the surfactant is a surfactant commonly used in the art, and is preferably one or more of L3001, L10366, L5309, a7730, a9956, B8724, and B8736.
In the invention, the cell opening agent is a mixture of a polypropylene oxide-ethylene oxide copolyether type cell opening agent and a polyalkylene oxide-polysiloxane copolymer type cell opening agent.
Preferably, the feeding mass ratio of the polypropylene oxide-ethylene oxide copolyether type pore opening agent to the polyoxyalkylene-polysiloxane copolymer type pore opening agent is 1.3-1.5: 1.
in the invention, the antioxidant is an antioxidant commonly used in the field, and is preferably one or more of hindered phenol antioxidants 1098, 1076, 300 and KY-586.
the raw materials of the invention can be obtained commercially, wherein, the polymer polyol is prepared by taking general polyether polyol as basic polyether (general soft foam polyether triol and high activity polyether), adding vinyl monomers such as acrylonitrile, styrene, methyl methacrylate, vinyl acetate, vinyl chloride and the like and initiator, and carrying out free radical graft polymerization at about 100 ℃ under the protection of nitrogen.
The second aspect of the invention provides a preparation method of the polyurethane foam, wherein the component A and the component B are mixed and then added into a reaction kettle for foaming to prepare the polyurethane foam.
The third aspect of the present invention is to provide a use of the polyurethane foam in an automobile headrest.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
the polyurethane high-resilience foam composition disclosed by the invention has the advantage of high strength, the compression strength can reach more than 5.5KPa, the resilience can reach more than 50%, the standard requirements of toxic and harmful substances specified in GB/T27630-2011' guidelines for evaluating air quality in passenger cars are met, the VOC content is low, the sound absorption effect is good, and the polyurethane composition is very suitable for automotive interior headrests.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The experimental means or test means not shown in the following examples of the present invention are conventional in the art unless otherwise specified.
Comparative example 1:
80 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, 5 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 3.5 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 5.0 parts of pore-forming agent and 3.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, then 40 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high-resilience foam composition A.
wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
example 1:
70 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, 15 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 4.0 parts of water, 0.7 part of catalyst, 0.9 part of surfactant, 3.5 parts of cell opener and 4.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, and then 45 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high resilience foam composition B.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Example 2:
60 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, 25 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 4.0 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 3.5 parts of cell opener and 5.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, then 50 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high resilience foam composition C.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Example 3:
50 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, which takes glycerin as an initiator, 30 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 4.0 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 3.5 parts of pore-opening agent and 5.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, and then 55 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high-resilience foam composition D.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Example 4:
80 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, 10 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 4.0 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 3.5 parts of pore-forming agent and 6.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, then 40 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high-resilience foam composition E.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Example 5:
60 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, 35 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 4.5 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 4.0 parts of pore-forming agent and 5.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, then 50 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high resilience foam composition F.
wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Example 6:
75 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/G, 20 parts of polymer polyol with the hydroxyl value of 28mgKOH/G, 4.5 parts of water, 0.9 part of catalyst, 0.4 part of surfactant, 2.0 parts of cell opener and 5.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, then 50 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high resilience foam composition G.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Example 7:
55 parts of propylene oxide/ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, which takes glycerin as an initiator, 30 parts of polymer polyol with the hydroxyl value of 28mgKOH/g, 4.5 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 2.5 parts of pore-forming agent and 4.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, and then 55 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high-resilience foam composition H.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
Comparative example 2:
100 parts of propylene oxide-ethylene oxide copolyether with the hydroxyl value of 35mgKOH/g, which takes glycerin as an initiator, 4.5 parts of water, 0.9 part of catalyst, 0.6 part of surfactant, 2.5 parts of pore-opening agent and 4.0 parts of antioxidant are uniformly mixed at the temperature of 25 ℃, poured into a reaction kettle, then 55 parts of isocyanate is added into the reaction kettle, uniformly stirred and cured for 15 minutes to obtain the polyurethane high-resilience foam composition I.
Wherein the catalyst is a mixture of dimethylethanolamine, triethanolamine and diisopropanolamine in a mass ratio of 0.5: 1, the surfactant is a mixture of L5309 and A7730 in a mass ratio of 2: 1, the pore former is a mixture of a polyoxypropylene-ethylene oxide copolyether type pore former and a polyoxyalkylene-polysiloxane copolymer type pore former in a mass ratio of 1.3: 1, the antioxidant is KY-586, and the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate in a mass ratio of 3: 1.
The properties of the polyurethane high resilience foam prepared by the above method are shown in Table 1.
TABLE 1
note: compressive strength test standard: GB/T6669-2008; breaking strength test standard: GB/T6344-2008; density test standard: GB/T6343; and (3) testing the resilience rate: GB/T6670-2008;
As shown in Table 1, the polyurethane high resilience foam composition of the examples of the present invention has a density of 60kg/m3 or less, a compressive hardness of 5.5kpa or more, a breaking strength of 90kpa or more, and a resilience of 50% or more.
The polyether and polymer polyol of comparative example 1 were not properly added in proportion, and the compressive strength of the product was poor. Comparative example 2 only uses propylene oxide ethylene oxide copolyether with a hydroxyl value of 35mgKOH/g, using glycerin as the initiator, and the physical properties of the product are significantly reduced.
The results of comparing the performance of the product of the embodiment of the invention with that of the same product in the market are shown in table 2.
TABLE 2
Note: odor test method: refer to SMTC 5400012.
VOC test method SMTC 5400018-.
It can be seen that the polyurethane foam composition of the present invention has a low VOC content, while having a low density and good breaking strength, and is very suitable for use in automotive headrests.
It should be noted that, the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
the above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A polyurethane foam characterized by: which is prepared by a foaming process of a component A and a component B,
The component A comprises the following raw materials in parts by weight:
The component B is isocyanate.
2. The polyurethane foam of claim 1, wherein: the component A comprises the following raw materials in parts by weight:
3. The polyurethane foam according to claim 1 or 2, characterized in that: the feeding mass ratio of the component A to the component B is 1.7-2.9: 1.
4. The polyurethane foam of claim 3, wherein: the feeding mass ratio of the component A to the component B is 1.7-2: 1.
5. The polyurethane foam according to claim 1 or 2, characterized in that: the catalyst is amine reaction type catalyst.
6. the polyurethane foam according to claim 1 or 2, characterized in that: the isocyanate is a mixture of diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate.
7. The polyurethane foam according to claim 1 or 2, characterized in that: the auxiliary agent is one or more of a surfactant, a pore-forming agent and an antioxidant.
8. the polyurethane foam of claim 7, wherein: the addition mass of the surfactant is 0.1-1 part; the addition mass of the pore-forming agent is 0.5-5 parts; the addition mass of the antioxidant is 2-6 parts.
9. a process for preparing a polyurethane foam as claimed in any one of claims 1 to 8, wherein: and mixing the component A and the component B, and adding the mixture into a reaction kettle for foaming to prepare the polyurethane foam.
10. Use of the polyurethane foam of any one of claims 1 to 8 in an automotive headrest.
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| CN112430304A (en) * | 2020-11-20 | 2021-03-02 | 上海苏杨泳池设备有限公司 | Back cushion for inflatable bathtub and manufacturing method thereof |
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| CN114106287A (en) * | 2020-09-01 | 2022-03-01 | 北汽岱摩斯汽车系统（重庆）有限公司 | Low-VOC (volatile organic compound) molded high-resilience polyurethane and preparation method thereof |
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| CN113583205A (en) * | 2021-06-29 | 2021-11-02 | 佳化化学科技发展（上海）有限公司 | Slow-resilience sponge and preparation method and application thereof |
| CN116333259A (en) * | 2021-12-22 | 2023-06-27 | 江苏长顺高分子材料研究院有限公司 | Sound-absorbing polyurethane material and preparation method and application thereof |
| CN114316208A (en) * | 2021-12-28 | 2022-04-12 | 苏州云裳电子有限公司 | Polyurethane environment-friendly foam and preparation method thereof |
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