CN110760286A - Room-temperature-cured high-strength two-component polyurethane structural adhesive and preparation method thereof - Google Patents
Room-temperature-cured high-strength two-component polyurethane structural adhesive and preparation method thereof Download PDFInfo
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- CN110760286A CN110760286A CN201910541441.5A CN201910541441A CN110760286A CN 110760286 A CN110760286 A CN 110760286A CN 201910541441 A CN201910541441 A CN 201910541441A CN 110760286 A CN110760286 A CN 110760286A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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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
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
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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
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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
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- 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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- Inorganic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a room-temperature-cured high-strength two-component polyurethane structural adhesive and a preparation method thereof. The two-component polyurethane structural adhesive is composed of a component A and a component B according to the mass ratio of 1-2: 1; the component A is composed of castor oil polyol, branched polyether polyol, a chain extender, an inorganic filler, a water absorbent, a thixotropic agent and a catalyst, and the component B is composed of polymeric MDI, MDI-50, a modified filler and a water removing agent. According to the invention, castor oil polyol and branched polyether polyol are adopted to replace the traditional polyether polyol, so that the obtained product has better hydrolysis resistance and bonding strength, and particularly has good bonding performance on metal, plastic and composite materials; adding micromolecular dihydric alcohol as a chain extender to improve the curing speed and strength; the stearic acid modified filler is adopted, so that the storage property of each component is ensured to be good, and the quality guarantee period is long; the product obtained by the invention does not use any solvent or plasticizer, and has good environmental protection performance and little smell.
Description
Technical Field
The invention relates to an adhesive, in particular to a room-temperature-cured high-strength two-component polyurethane structural adhesive and a preparation method thereof.
Background
The polyurethane adhesive is an adhesive containing carbamate (-NHCOO-) or isocyanate (-NCO) in a molecular chain, and has excellent chemical bonding force with a substrate containing active hydrogen, such as porous materials of foam, plastic, wood, leather, fabric, paper, ceramic and the like, and materials with smooth surfaces of metal, glass, rubber, plastic and the like. The polyurethane adhesive has excellent shear strength and impact resistance, is suitable for various structural adhesion fields, has excellent flexibility, and can be designed into a structural adhesive. Meanwhile, the polyurethane adhesive has the characteristics of low price, vibration resistance, low temperature resistance, no solvent and environmental protection, and is very widely applied. The bi-component polyurethane adhesive belongs to a reactive adhesive, and the two components are mixed to generate a cross-linking reaction to be cured and bonded. The adhesive can be cured at room temperature or heated, has stronger final adhesive strength than a single-component adhesive, and can meet the requirements of a structural adhesive. The two-component polyurethane adhesive has excellent impact resistance, durability, fatigue resistance, low temperature resistance and excellent bonding strength, and becomes the first choice of structural adhesives.
The two-component polyurethane structural adhesive is widely applied to the industries of power batteries, rail transit, automobile manufacturing, engineering structures and buildings. At present, the common bi-component polyurethane structural adhesive in the market has the problems of slow normal-temperature curing, low bonding strength and poor storage stability, so that the application of the adhesive is greatly limited. In order to solve the problem, an adhesive with short curing time, high bonding strength and good storage property is needed to meet the requirements of various customers.
Disclosure of Invention
Aiming at the problems of slow normal-temperature curing, low bonding strength and poor storage stability of the conventional bi-component polyurethane structural adhesive, the invention aims to provide a room-temperature curing high-strength bi-component polyurethane structural adhesive and a preparation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a room-temperature-cured high-strength two-component polyurethane structural adhesive is composed of a component A and a component B according to a mass ratio of 1-2: 1;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the branched polyether polyol is a 100% solid content branched grease chemical polyether polyol, the hydroxyl value of the branched polyether polyol is 100-1000mgKOH/g, the functionality is 2.5-4.0, and the branched polyether polyol is a commercial product. Sovermol45, 100, 1092, 1102 trademarks from BASF corporation are preferably used;
the chain extender is micromolecular dihydric alcohol; the chain extender is preferably any one or more of 1, 4-butanediol, ethylene glycol, diethylene glycol, dipropylene glycol, 1, 2-propanediol, methyl propanediol and neopentyl glycol mixed in any proportion;
the water absorbent is one or a mixture of more of calcium oxide, a 3A molecular sieve and a 4A molecular sieve in any proportion;
the thixotropic agent is fumed silica;
the catalyst is one or more of dibutyltin dilaurate (T12), stannous octoate, bismuth isooctanoate, zinc isooctanoate, tetrabutyl titanate, tetraisopropyl titanate, trimethylene diamine, tetraethylenepentamine, N-methylmorpholine, N-methylimidazole and 1, 4-dimethylpiperazine;
the water removal agent is p-toluenesulfonyl isocyanate (Ti) or triethyl orthoformate;
the inorganic filler is one or more of calcium carbonate, talcum powder, diatomite, kaolin, silica powder and mica powder which are mixed in any proportion;
the modified filler is stearic acid modified nano calcium carbonate or stearic acid modified heavy calcium carbonate; the stearic acid modified filler ensures that each component has good storability and long shelf life.
The invention relates to a preparation method of room-temperature-cured high-strength two-component polyurethane structural adhesive, which specifically comprises the following steps:
(1) preparation of component A: adding castor oil polyol, branched polyether polyol and a chain extender into a vacuum dispersion kettle at room temperature, and heating to 50-60 ℃; adding a water absorbent, a thixotropic agent and an inorganic filler, stirring at 600-1200 rpm for 90-120 min under a vacuum state, adding a catalyst, continuously stirring for 10-20 min, cooling to 40 ℃, and discharging to obtain a component A;
(2) preparation of the component B: putting the polymeric MDI and MDI-50 into a vacuum dispersion kettle, heating to 50-60 ℃, adding a modified filler, stirring at 600-1200 rpm for 60-90 min under a vacuum state, adding a water removing agent, continuously stirring for 10min, cooling to 40 ℃, discharging to obtain a component B;
(3) preparing a two-component polyurethane structural adhesive: and (3) mixing the component A prepared in the step (1) with the component B prepared in the step (2) in proportion to prepare the polyurethane structural adhesive.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, castor oil polyol and branched polyether polyol are adopted to replace the traditional polyether polyol, so that the obtained product has better hydrolysis resistance and bonding strength, particularly good bonding performance on metal, plastic and composite materials, and the shear strength can reach 25 MPa;
(2) small molecular dihydric alcohol is added as a chain extender, so that the curing speed is improved, and the high strength can be achieved at normal temperature and heating;
(3) the two-component design is adopted, the water removing agent is added, and the stearic acid modified filler is used, so that the storage property of each component is ensured to be good, and the quality guarantee period is long;
(4) the product obtained by the invention does not use any solvent or plasticizer, and has good environmental protection performance and little smell.
Detailed Description
The present invention will be described below with reference to specific examples, but the present invention is not limited to these examples. All starting materials are, unless otherwise specified, commercially available products.
Example 1
A room temperature curing high-strength two-component polyurethane structural adhesive comprises a component A and a component B, wherein the component A and the component B are used in a matching manner according to the mass ratio of 1.5: 1;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the two-component polyurethane structural adhesive comprises the following steps:
the preparation method of the component A comprises the following steps: adding castor oil polyol, branched polyether polyol and a chain extender into a vacuum dispersion kettle at room temperature, and heating to 50-60 ℃; adding a water absorbent, a thixotropic agent and a filler, stirring at 600-1200 rpm for 90-120 min under a vacuum state, adding a catalyst, continuously stirring for 10-20 min, cooling to 40 ℃, and discharging;
the preparation method of the component B comprises the following steps: and (2) putting the polymeric MDI and the MDI-50 into a vacuum dispersion kettle, heating to 50-60 ℃, adding the modified filler, stirring at 600-1200 rpm for 60-90 min under a vacuum state, adding the water removing agent, continuously stirring for 10min, cooling to 40 ℃, and discharging.
Example 2
A room temperature curing high-strength two-component polyurethane structural adhesive comprises a component A and a component B, wherein the component A and the component B are used in a matching manner according to the mass ratio of 1.8: 1;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the two-component polyurethane structural adhesive comprises the following steps:
the preparation method of the component A comprises the following steps: adding castor oil polyol, branched polyether polyol and a chain extender into a vacuum dispersion kettle at room temperature, and heating to 50-60 ℃; adding a water absorbent, a thixotropic agent and a filler, stirring at 600-1200 rpm for 90-120 min under a vacuum state, adding a catalyst, continuously stirring for 10-20 min, cooling to 40 ℃, and discharging;
the preparation method of the component B comprises the following steps: and (2) putting the polymeric MDI and the MDI-50 into a vacuum dispersion kettle, heating to 50-60 ℃, adding the modified filler, stirring at 600-1200 rpm for 60-90 min under a vacuum state, adding the water removing agent, continuously stirring for 10min, cooling to 40 ℃, and discharging.
Example 3
A room temperature curing high-strength two-component polyurethane structural adhesive comprises a component A and a component B, wherein the component A and the component B are used in a matching manner according to the mass ratio of 1.6: 1;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the two-component polyurethane structural adhesive comprises the following steps:
the preparation method of the component A comprises the following steps: adding castor oil polyol, branched polyether polyol and a chain extender into a vacuum dispersion kettle at room temperature, and heating to 50-60 ℃; adding a water absorbent, a thixotropic agent and a filler, stirring at 600-1200 rpm for 90-120 min under a vacuum state, adding a catalyst, continuously stirring for 10-20 min, cooling to 40 ℃, and discharging;
the preparation method of the component B comprises the following steps: and (2) putting the polymeric MDI and the MDI-50 into a vacuum dispersion kettle, heating to 50-60 ℃, adding the modified filler, stirring at 600-1200 rpm for 60-90 min under a vacuum state, adding the water removing agent, continuously stirring for 10min, cooling to 40 ℃, and discharging.
Example 4
A room temperature curing high-strength two-component polyurethane structural adhesive comprises a component A and a component B, wherein the component A and the component B are used in a matching manner according to the mass ratio of 1.2: 1;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the preparation method of the two-component polyurethane structural adhesive comprises the following steps:
the preparation method of the component A comprises the following steps: adding castor oil polyol, branched polyether polyol and a chain extender into a vacuum dispersion kettle at room temperature, and heating to 50-60 ℃; adding a water absorbent, a thixotropic agent and a filler, stirring at 600-1200 rpm for 90-120 min under a vacuum state, adding a catalyst, continuously stirring for 10-20 min, cooling to 40 ℃, and discharging;
the preparation method of the component B comprises the following steps: and (2) putting the polymeric MDI and the MDI-50 into a vacuum dispersion kettle, heating to 50-60 ℃, adding the modified filler, stirring at 600-1200 rpm for 60-90 min under a vacuum state, adding the water removing agent, continuously stirring for 10min, cooling to 40 ℃, and discharging.
Comparative example 1
Example 1 was repeated except that 48 parts of castor oil polyol in the component A was replaced with 48 parts of polyether polyol N310 (hydroxyl value: 170mgKOH/g), and 6 parts of SOVERMOL 1102 (hydroxyl value: 230mgKOH/g) was replaced with 4.2 parts of a mixture of polyether diol N204 (hydroxyl value: 280mgKOH/g) and 1.8 parts of polyether diol N210 (hydroxyl value: 112 mgKOH/g).
Comparative example 2
The same procedure as in example 1 was repeated except that 4g of dipropylene glycol was replaced with 12 parts of polyether diol N204 in the component A.
Comparative example 3
The stearic acid modified heavy calcium carbonate in the component B is replaced by heavy calcium carbonate, the water removing agent Ti is removed, and the method is the same as the example 1.
Performance testing
Testing the cured hardness according to a GB/T531-1999 method, and taking an average value for 3 times; the curing time is expressed in terms of the time at which the hardness reaches a maximum; the shear strength is detected according to the GB/T7124-2008 method, and an aluminum sheet, ABS plastic and a composite SMC are respectively adopted for testing; the extrudability is tested according to the method of GB/T13477.3, and the average value is taken for 3 times; storage stability is expressed in terms of change in extrudability; the results are given in table 1 below:
TABLE 1 Performance test results for two-component polyurethane structural adhesives of the present invention and comparative example structural adhesives
From the test results in table 1, in terms of curing speed, the curing time of examples 1-4 is within 5h, while that of comparative example 2 is much slower because small molecule diol as chain extender is not used, and the curing speed needs 12 h; in terms of shear strength, examples 1-4 all showed very high strength for aluminum sheets, ABS plastics and SMC composites, whereas comparative example 1 decreased shear strength a lot because common polyether polyol was used instead of castor oil polyol and branched polyether polyol, which indicates that very high adhesive strength can be obtained by using castor oil polyol in combination with branched polyether polyol; in terms of storage stability, the examples 1 to 4 showed little change in extrudability after standing at normal temperature for 6 months, and showed good stability, whereas comparative example 3 showed very significant decrease in extrudability due to the absence of stearic acid-modified calcium carbonate and the removal of a water scavenger, and was very difficult to apply a paste after standing at normal temperature for 6 months.
Claims (4)
1. The room-temperature-cured high-strength two-component polyurethane structural adhesive is characterized by comprising a component A and a component B in a mass ratio of 1-2: 1;
the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
the branched polyether polyol is a branched grease chemical polyether polyol with 100 percent of solid content, the hydroxyl value is 100-1000mgKOH/g, the functionality is 2.5-4.0, and the polyether polyol is a commercial product;
the chain extender is micromolecular dihydric alcohol;
the water absorbent is one or a mixture of more of calcium oxide, a 3A molecular sieve and a 4A molecular sieve in any proportion;
the thixotropic agent is fumed silica;
the catalyst is one or more of dibutyltin dilaurate (T12), stannous octoate, bismuth isooctanoate, zinc isooctanoate, tetrabutyl titanate, tetraisopropyl titanate, trimethylene diamine, tetraethylenepentamine, N-methylmorpholine, N-methylimidazole and 1, 4-dimethylpiperazine;
the water removal agent is p-toluenesulfonyl isocyanate (Ti) or triethyl orthoformate;
the inorganic filler is one or more of calcium carbonate, talcum powder, diatomite, kaolin, silica powder and mica powder which are mixed in any proportion;
the modified filler is stearic acid modified nano calcium carbonate or stearic acid modified heavy calcium carbonate.
2. The room temperature curing high strength two-component polyurethane structural adhesive as claimed in claim 1, wherein the branched polyether polyol is available from BASF under the trade designation Sovermol45, 100, 1092, 1102.
3. The room-temperature-curing high-strength two-component polyurethane structural adhesive as claimed in claim 1, wherein the chain extender is one or more of 1, 4-butanediol, ethylene glycol, diethylene glycol, dipropylene glycol, 1, 2-propylene glycol, methyl propylene glycol and neopentyl glycol.
4. The preparation method of the room-temperature-curing high-strength two-component polyurethane structural adhesive as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
(1) preparation of component A: adding castor oil polyol, branched polyether polyol and a chain extender into a vacuum dispersion kettle at room temperature, and heating to 50-60 ℃; adding a water absorbent, a thixotropic agent and an inorganic filler, stirring at 600-1200 rpm for 90-120 min under a vacuum state, adding a catalyst, continuously stirring for 10-20 min, cooling to 40 ℃, and discharging to obtain a component A;
(2) preparation of the component B: putting the polymeric MDI and MDI-50 into a vacuum dispersion kettle, heating to 50-60 ℃, adding a modified filler, stirring at 600-1200 rpm for 60-90 min under a vacuum state, adding a water removing agent, continuously stirring for 10min, cooling to 40 ℃, discharging to obtain a component B;
(3) preparing a two-component polyurethane structural adhesive: and (3) mixing the component A prepared in the step (1) with the component B prepared in the step (2) in proportion to prepare the polyurethane structural adhesive.
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| CN112552863A (en) * | 2020-12-03 | 2021-03-26 | 上海回天新材料有限公司 | Solvent-free bi-component polyurethane adhesive for structural bonding and application |
| CN113583590A (en) * | 2020-04-30 | 2021-11-02 | 宁德时代新能源科技股份有限公司 | Two-component adhesive composition, method for disassembling adhesive and battery containing adhesive |
| CN113667443A (en) * | 2021-09-15 | 2021-11-19 | 杭州之江新材料有限公司 | Double-component polyurethane heat-conducting structural adhesive and preparation method thereof |
| CN113861926A (en) * | 2021-11-23 | 2021-12-31 | 上海灵啊实业有限公司 | Bi-component polyurethane adhesive and coffee grounds composition and preparation method thereof |
| CN115160531A (en) * | 2022-08-15 | 2022-10-11 | 山东亿博润新材料科技有限公司 | High-filling-capacity all-plastic polyurethane plastic material |
| CN115181532A (en) * | 2021-09-03 | 2022-10-14 | 道生天合材料科技(上海)股份有限公司 | Polyurethane structural adhesive and preparation method thereof |
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| CN115181532A (en) * | 2021-09-03 | 2022-10-14 | 道生天合材料科技(上海)股份有限公司 | Polyurethane structural adhesive and preparation method thereof |
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| CN113861926A (en) * | 2021-11-23 | 2021-12-31 | 上海灵啊实业有限公司 | Bi-component polyurethane adhesive and coffee grounds composition and preparation method thereof |
| CN115260972A (en) * | 2022-05-31 | 2022-11-01 | 世晨材料技术(上海)有限公司 | Bio-based two-component polyurethane structural adhesive |
| CN115160531A (en) * | 2022-08-15 | 2022-10-11 | 山东亿博润新材料科技有限公司 | High-filling-capacity all-plastic polyurethane plastic material |
| CN115160531B (en) * | 2022-08-15 | 2024-02-09 | 山东亿博润新材料科技有限公司 | High-filling-amount full-plastic polyurethane plastic material |
| CN116536021B (en) * | 2023-04-28 | 2024-03-12 | 浙江耀阳新材料科技有限公司 | Polyurethane adhesive and preparation method thereof |
| CN116536021A (en) * | 2023-04-28 | 2023-08-04 | 浙江耀阳新材料科技有限公司 | Polyurethane adhesive and preparation method thereof |
| CN116694216A (en) * | 2023-06-29 | 2023-09-05 | 海洋化工研究院有限公司 | Room-temperature-cured two-component high-strength high-elasticity high-wear-resistance polyurethane resin and preparation method thereof |
| CN117106403A (en) * | 2023-07-17 | 2023-11-24 | 韦尔通科技股份有限公司 | Flexible solvent-free double-component PU (polyurethane) structural adhesive and preparation method thereof |
| CN117106403B (en) * | 2023-07-17 | 2024-06-04 | 韦尔通科技股份有限公司 | Flexible solvent-free double-component PU (polyurethane) structural adhesive and preparation method thereof |
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