CN112521900A - Reactive polyurethane hot melt adhesive for bullet train floor cloth and preparation method thereof - Google Patents
Reactive polyurethane hot melt adhesive for bullet train floor cloth and preparation method thereof Download PDFInfo
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- CN112521900A CN112521900A CN202011418981.3A CN202011418981A CN112521900A CN 112521900 A CN112521900 A CN 112521900A CN 202011418981 A CN202011418981 A CN 202011418981A CN 112521900 A CN112521900 A CN 112521900A
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- Prior art keywords
- melt adhesive
- hot melt
- polyurethane hot
- bonding
- reactive polyurethane
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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
- C09J175/06—Polyurethanes from polyesters
-
- 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
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a reactive polyurethane hot melt adhesive for bonding bullet train floor cloth, which is prepared from polyester polyol, modified polyester polyol, saturated polyester resin, polyolefin (APAO), Thermoplastic Polyurethane (TPU), tackifying resin, an adhesion promoter, an antioxidant, an ultraviolet absorbent, a stabilizer, isocyanate, a catalyst and an adhesion promoter. The invention also discloses a preparation method of the reactive polyurethane hot melt adhesive for bonding the bullet train floor cloth. The reactive polyurethane hot melt adhesive for bonding the bullet train floor cloth disclosed by the invention has the advantages of long opening time, high initial viscosity and high bonding strength, and meanwhile, after the product is completely cured, the product has higher bonding strength to various materials, and is environment-friendly and harmless.
Description
Technical Field
The invention relates to the technical field of synthesis of polyurethane hot melt adhesives, and particularly relates to a reactive polyurethane hot melt adhesive for bonding bullet train floor cloth and a preparation method thereof.
Background
The polyurethane adhesive refers to an adhesive containing a carbamate group (-NHCOO-) or an isocyanate group (-NCO) in a molecular chain. Polyurethane adhesives have always had the following properties: the adhesive has flexible reaction activity, has higher bonding strength to substrates containing active hydrogen or water absorption, such as metal, wood, rubber, fiber, wood, leather, plastic and the like, can be cured at room temperature or heated, can easily form a cross-linked structure, and has excellent low-temperature resistance, good flexibility, high peel strength, impact resistance, vibration resistance, good fatigue resistance and wide application.
For a long time, solvent-type neoprene has been used for bonding floor cloths of motor vehicles. The solvent-type chloroprene rubber adhesive has good bonding effect, large initial adhesion, simple operation and excellent weather resistance, but has large smell, high VOC (volatile organic Compounds) emission and great harm to the environment and health. After the neoprene adhesive is well bonded, organic solvent can be continuously released, so that large peculiar smell exists in a carriage, and drivers and passengers can feel uncomfortable reactions such as dizziness, nausea and the like after contacting for a long time, so that the physical and psychological health of the drivers and passengers is damaged; the organic solvent of sustained release still can permanent corruption floor cloth, causes the bonding bad, appears the swell phenomenon, is lasting appearing moreover, and personnel walk and luggage are dilatory frequently, and the swell scope enlarges, influences the roughness on floor promptly and has very big potential safety hazard again.
At present, a plurality of bumps appear on a running motor car with long service life, and the motor car needs to be overhauled and replaced at intervals, so that the VOC emission of a carriage is continuously high, and drivers and conductors frequently complain with the enhancement of public environmental protection awareness and health concern awareness, and the motor car manufacturing enterprises are forced to make urgent improvement.
China began to explore experiments in the last 90 th century, and after 2000, the basic idea of changing the technology from the market was determined, and foreign technologies were introduced integrally. By now, China has own high-speed rail independent property right and a compound number, the mileage of high-speed rails exceeds the sum of other countries in the world, and 20.05 hundred million passengers are sent in 2018. The bonding of the floor cloth of the motor car is an adhesive and a process determined more than 30 years ago, and the improvement and the replacement upgrade are not carried out so far, so that the bonding of the floor cloth of the motor car seriously lags the current technical progress.
The motor car floor cloth is mainly made of styrene butadiene rubber, and materials bonded with the motor car floor cloth comprise aluminum and plywood. The styrene butadiene rubber is a nonpolar material, belongs to a material difficult to bond, and the final strength is not lower than 3N/mm or the material is damaged in the technical requirement of floor cloth bonding, so that the adhesive is required to have good adhesive force and bonding strength to the floor cloth and aluminum, and the cohesive strength of the adhesive is also high; the bonding part has a special shape, the technical requirements of floor cloth bonding require that the bonding is porcelain solid, and virtual bonding cannot be realized or obvious pits appear by finger pressing, so that the adhesive is required to have good initial bonding force; the length of the motor car compartment is about 20 meters, the motor car compartment needs to be carefully aligned during bonding, and the construction time is long, so that the adhesive needs to have long opening time and good thermal stability; .
Therefore, in order to solve the problems of bonding and technological process of the floor cloth of the motor car and subsequent VOC (volatile organic compounds), improve the comfort of the motor car and reduce the frequency of overhauling and replacing, the product which is environment-friendly, high in initial adhesion, high in strength and convenient to operate can be provided, and the problem which needs to be solved at present is urgently needed.
Disclosure of Invention
The reactive polyurethane hot melt adhesive has the rapid positioning and curing performance of the hot melt adhesive, the production efficiency can be greatly improved in industrial production, and meanwhile, due to the characteristic of moisture crosslinking and curing, the reactive polyurethane hot melt adhesive has higher maximum bonding strength to wood, metal, plastic, glass and the like, and has excellent heat resistance, durability, chemical resistance and water resistance. Therefore, the reactive polyurethane hot melt adhesive is widely applied to various industries and is the first choice for replacing solvent adhesives, improving the production efficiency, improving the environment and protecting the human health. At present, no research on the bonding aspect of the motor car floor cloth exists at home and abroad, so that one of the purposes of the invention is to develop the reaction type polyurethane hot melt adhesive for solving the problem of VOC release in the bonding of the motor car floor cloth and solve the problem of the bonding of the reaction type polyurethane hot melt adhesive to styrene butadiene rubber and aluminum.
The second purpose of the invention is to provide a preparation method of the reactive polyurethane hot melt adhesive for the floor cloth of the bullet train.
The reactive polyurethane hot melt adhesive for the bullet train floor cloth is prepared from the following raw materials in parts by weight:
wherein the molecular weight of the polyester polyol is 400-8500 g/mol, and the functionality is 2.
The molecular weight of the modified polyester polyol is 1000-8000 g/mol, and the functionality is 2-2.5.
In a preferred embodiment of the present invention, the molecular weight of the polyester polyol is preferably 1000 to 5000 g/mol.
In a preferred embodiment of the invention, the polyester polyol preferably has a molecular weight of 2000-4000 g/mol and a functionality of 2-2.5.
In a preferred embodiment of the invention, the isocyanate is diphenylmethane diisocyanate (pure MDI).
In a preferred embodiment of the present invention, the saturated polyester resin includes any one or more of a general type, a benzene ring-containing structure type and a specific structure-modified type, and a low-molecular weight, low-softening point saturated polyester resin containing a specific structure is preferred.
In a preferred embodiment of the present invention, the tackifying resin comprises any one or more of rosin resin, petroleum resin, phenolic resin, terpene resin, aldehyde ketone resin, preferably aldehyde ketone resin and modified rosin resin.
In a preferred embodiment of the invention, the Thermoplastic Polyurethane (TPU) is a low softening point, high hardness, medium crystallization rate modified TPU.
In a preferred embodiment of the present invention, the stabilizer is a mixture of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010) and tris [2, 4-di-tert-butylphenyl ] phosphite (168).
In a preferred embodiment of the present invention, the stabilizer is one or a mixture of any two or more of phosphoric acid, erucic acid, benzoic acid and citric acid, preferably phosphoric acid.
In a preferred embodiment of the invention, the catalyst is 2, 2-dimorpholinodiethylether (DMDEE).
In a preferred embodiment of the present invention, the adhesion promoter is any one or more of an adhesion promoter and a modified polyester, and is preferably a silane coupling agent.
In order to realize the second purpose of the invention, the adopted technical scheme is as follows:
a preparation method of a reactive polyurethane hot melt adhesive for bonding of bullet train floor cloth comprises the following steps:
the method comprises the following steps: respectively weighing polyester polyol, modified polyester polyol, saturated polyester resin, TPU, tackifying resin, a stabilizer and an antioxidant according to the weight parts of the formula, and putting into a reaction kettle;
step two: heating the material added into the reaction kettle in the step one to 120-140 ℃, completely melting the solid material, uniformly stirring, vacuumizing for dehydration, preserving heat, and vacuumizing for 45-60 min, wherein the vacuum degree is kept below-0.096 MPa;
step three: after the heat preservation and the vacuum pumping are finished, nitrogen is used for emptying, the temperature is reduced to be lower than 110 ℃, pure MDI is added, the mixture is uniformly stirred, the heat preservation and the vacuum pumping are carried out for reaction for 60-90 min, the reaction temperature is 110-130 ℃, and the vacuum degree is kept to be lower than-0.096 Mpa;
step four: after the heat preservation reaction is finished, emptying the reaction kettle by using nitrogen, adding a catalyst and an adhesion promoter, continuing heat preservation and vacuum pumping reaction for 30-60 min, wherein the reaction temperature is 110-130 ℃, and the vacuum degree is kept below-0.096 Mpa;
step five: after the reaction is finished, nitrogen is used for emptying, and discharging is carried out, so that the detachable reaction type polyurethane hot melt adhesive for bonding the mobile phone frame is obtained.
The invention has the beneficial effects that:
the reactive polyurethane hot melt adhesive has low viscosity and good fluidity; the thermal stability is good, and the viscosity change is not more than 100% at 150 ℃ for 4 h; the opening time is long, and is not less than 30min under the environmental condition of 15 ℃ and RH 50%; the positioning speed is high, and pressure maintaining is avoided; the adhesive strength is high, the adhesive strength is good for floor cloth, aluminum and plywood, and the floor cloth can be damaged; after the glue is cured, the toughness is good, and the glue is resistant to temperature, water, oil, vibration and extrusion; convenient construction, no VOC release, environmental protection and no harm.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 raw materials in the following examples are calculated by weight parts as follows:
example 1
Weighing 100g of polyester polyol, 20g of modified polyester polyol, 20g of saturated polyester resin, 20g g of TPU, 15g of tackifying resin, 0.1g of antioxidant and 0.1g of phosphoric acid agent, adding into a reaction kettle, heating to 140 ℃, vacuumizing and dehydrating after completely dissolving solid materials, uniformly stirring, keeping the temperature and vacuumizing for 60min, and keeping the vacuum degree at-0.1 Mpa; cooling to 110 ℃, exhausting nitrogen, adding 25 parts of pure MDI, reacting at 120 ℃ for 60min, exhausting nitrogen, adding 0.2 part of DMDEE and 2 parts of adhesion promoter, continuously maintaining the temperature at 120 ℃, reacting at-0.1 Mpa for 30min, exhausting nitrogen, and discharging to obtain the reactive polyurethane hot melt adhesive for bonding the motor vehicle floor cloth.
Example 2
Weighing 100g of polyester polyol, 40g of modified polyester polyol, 20g of saturated polyester resin, 20g g of TPU, 25g of tackifying resin, 0.1g of antioxidant and 0.1g of phosphoric acid agent, adding into a reaction kettle, heating to 140 ℃, vacuumizing and dehydrating after completely dissolving solid materials, uniformly stirring, keeping the temperature and vacuumizing for 60min, and keeping the vacuum degree at-0.1 Mpa; cooling to 110 ℃, exhausting nitrogen, adding 28 parts of pure MDI, reacting at 120 ℃ for 60min, exhausting nitrogen, adding 0.2 part of DMDEE and 2 parts of adhesion promoter, continuously maintaining the temperature at 120 ℃, reacting at-0.1 Mpa for 30min, exhausting nitrogen, and discharging to obtain the reactive polyurethane hot melt adhesive for bonding the motor vehicle floor cloth.
Example 3
Weighing 100g of polyester polyol, 49g of modified polyester polyol, 30g of saturated polyester resin, 20g of TPU, 17.5g of tackifying resin, 0.1g of antioxidant and 0.1g of phosphoric acid agent, adding into a reaction kettle, heating to 140 ℃, completely melting solid materials, uniformly stirring, vacuumizing and dehydrating, keeping the temperature and vacuumizing for 60min, and keeping the vacuum degree at-0.1 Mpa; cooling to 110 ℃, exhausting nitrogen, adding 25 parts of pure MDI, reacting at 120 ℃ for 60min, exhausting nitrogen, adding 0.2 part of DMDEE and 2 parts of adhesion promoter, continuously maintaining the temperature at 120 ℃, reacting at-0.1 Mpa for 30min, exhausting nitrogen, and discharging to obtain the reactive polyurethane hot melt adhesive for bonding the motor vehicle floor cloth.
The test performance results of examples 1-3 and comparative example 1 are shown in Table 1:
TABLE 1
Supplementary notes on table 1: and (3) complete curing conditions: standing for 7 days at 23 + -2 deg.C and 50 + -5% RH.
Compared with the solvent type neoprene adhesive in the comparative example, the reactive polyurethane hot melt adhesive disclosed by the invention has the advantages that the opening time is long and the construction is convenient through the examples 1, 2 and 3 in the table 1; 100 percent of solid content, no VOC release, environmental protection and harmlessness, and the organic solvent content of the solvent type neoprene exceeds 70 percent; the glue consumption is saved, and the light weight of the vehicle is facilitated; has good adhesive force to various base materials and high bonding strength. Compared with the performances in the prior art, the product disclosed by the embodiment of the invention has the comprehensive performance better than that of solvent type chloroprene rubber, is long in opening time, good in thermal stability, environment-friendly, harmless and high in cost performance, has excellent strength performance, meets the bonding requirements of various materials, especially has very good adhesive force to a non-polar material such as rubber, has a wide application prospect, and has unique competitive advantages.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (12)
1. The reactive polyurethane hot melt adhesive for bonding the motor car floor cloth is characterized by being prepared from the following raw materials in parts by weight:
2. the reactive polyurethane hot melt adhesive for bonding motor vehicle floor cloths as claimed in claim 1, wherein the polyester polyol is a crystalline polyester polyol and/or an amorphous polyester polyol, has a molecular weight of 400 to 8500g/mol and a functionality of 2.
3. The reactive polyurethane hot melt adhesive for bonding motor vehicle floor cloth according to claim 1, wherein the modified polyester polyol is obtained by graft modification of amorphous polyester polyol, and has a molecular weight of 1000 to 8000g/mol and a functionality of 2 to 2.5.
4. The reactive polyurethane hot melt adhesive for bonding automotive floor cloths of claim 1, wherein the isocyanate is diphenylmethane diisocyanate (pure MDI).
5. The reactive polyurethane hot melt adhesive for bonding the floor cloth of the bullet train as claimed in claim 1, wherein the saturated polyester resin has a linear structure and a molecular weight of 20000 to 60000 g/mol.
6. The reactive polyurethane hot melt adhesive for bonding motor vehicle floor cloths of claim 1, wherein the tackifying resin comprises any one or more of rosin resin, petroleum resin, phenolic resin, terpene resin and aldehyde ketone resin.
7. A reactive polyurethane hot melt adhesive for bonding automotive floor cloths as claimed in claim 1, wherein the Thermoplastic Polyurethane (TPU) is a modified TPU having a low softening point, a high hardness, and a moderate crystallization rate.
8. The reactive polyurethane hot melt adhesive for bonding automotive floor cloths of claim 1, wherein the catalyst is 2, 2-dimorpholinodiethylether (DMDEE).
9. The reactive polyurethane hot melt adhesive for motor vehicle floor cloths as claimed in claim 1, wherein the antioxidant is a mixture of tetra [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propanoic acid ] pentaerythritol ester (1010) and tris [2, 4-di-tert-butylphenyl ] phosphite (168).
10. The reactive polyurethane hot melt adhesive for motor vehicle floor cloths as claimed in claim 1, wherein the stabilizer is one or a mixture of any two or more of phosphoric acid, erucic acid, benzoic acid and citric acid.
11. The reactive polyurethane hot melt adhesive for bullet train floor cloths of claim 1, wherein the adhesion promoter comprises any one or more of a silane coupling agent and a modified polyester
12. A method of preparing a reactive polyurethane hot melt adhesive for use in bonding automotive floor coverings according to any one of claims 1 to 11, comprising the steps of:
the method comprises the following steps: respectively weighing polyester polyol, modified polyester polyol, saturated polyester resin, thermoplastic polyurethane, tackifying resin, a stabilizer and an antioxidant according to the weight parts of the formula, and putting into a reaction kettle;
step two: heating the material added into the reaction kettle in the step one to 120-140 ℃, completely melting the solid material, uniformly stirring, vacuumizing for dehydration, preserving heat, and vacuumizing for 45-60 min, wherein the vacuum degree is kept below-0.096 MPa;
step three: after the heat preservation and the vacuum pumping are finished, nitrogen is used for emptying, the temperature is reduced to be lower than 110 ℃, pure MDI is added, the mixture is uniformly stirred, the heat preservation and the vacuum pumping are carried out for reaction for 60-90 min, the reaction temperature is 110-130 ℃, and the vacuum degree is kept to be lower than-0.096 Mpa;
step four: after the heat preservation reaction is finished, emptying the reaction kettle by using nitrogen, adding a catalyst and an adhesion promoter, and continuing to carry out heat preservation and vacuum pumping reaction for 30-60 min at the reaction temperature of 110-130 ℃ and the vacuum degree of below-0.096 Mpa;
step five: and after the reaction is finished, emptying the reaction mixture by using nitrogen, and discharging the reaction mixture to obtain the reactive polyurethane hot-melt adhesive for bonding the motor car floor cloth.
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| CN202011418981.3A CN112521900A (en) | 2020-12-07 | 2020-12-07 | Reactive polyurethane hot melt adhesive for bullet train floor cloth and preparation method thereof |
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| CN202011418981.3A CN112521900A (en) | 2020-12-07 | 2020-12-07 | Reactive polyurethane hot melt adhesive for bullet train floor cloth and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716959A (en) * | 2021-12-24 | 2022-07-08 | 无锡市万力粘合材料股份有限公司 | Polyurethane hot melt adhesive for automobile spare tire cover plate and preparation method thereof |
| CN115820196A (en) * | 2022-11-30 | 2023-03-21 | 康菲胶粘剂技术（广东）有限公司 | Polyurethane hot melt adhesive for edge sealing of plates and preparation method thereof |
| CN115851210A (en) * | 2022-12-12 | 2023-03-28 | 康达新材料(集团)股份有限公司 | Reactive polyurethane hot melt adhesive for flat pasting of large board and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110256999A (en) * | 2019-06-19 | 2019-09-20 | 烟台泰盛精化科技有限公司 | A kind of high just intensity reaction type polyurethane hot-melt adhesive and preparation method thereof |
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2020
- 2020-12-07 CN CN202011418981.3A patent/CN112521900A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110256999A (en) * | 2019-06-19 | 2019-09-20 | 烟台泰盛精化科技有限公司 | A kind of high just intensity reaction type polyurethane hot-melt adhesive and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716959A (en) * | 2021-12-24 | 2022-07-08 | 无锡市万力粘合材料股份有限公司 | Polyurethane hot melt adhesive for automobile spare tire cover plate and preparation method thereof |
| CN114716959B (en) * | 2021-12-24 | 2024-03-19 | 无锡市万力粘合材料股份有限公司 | Polyurethane hot melt adhesive for automobile spare tire cover plate and preparation method thereof |
| CN115820196A (en) * | 2022-11-30 | 2023-03-21 | 康菲胶粘剂技术（广东）有限公司 | Polyurethane hot melt adhesive for edge sealing of plates and preparation method thereof |
| CN115851210A (en) * | 2022-12-12 | 2023-03-28 | 康达新材料(集团)股份有限公司 | Reactive polyurethane hot melt adhesive for flat pasting of large board and preparation method thereof |
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Address after: 169 Leizhou Road, Fengxian District, Shanghai, 201419 Applicant after: Kangda new material (Group) Co.,Ltd. Address before: 169 Leizhou Road, Fengxian District, Shanghai, 201419 Applicant before: Shanghai Kangda Chemical New Material Group Co.,Ltd. |