CN112280134A - Tear-resistant rubber plate for photovoltaic laminator and preparation method thereof - Google Patents
Tear-resistant rubber plate for photovoltaic laminator and preparation method thereof Download PDFInfo
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- CN112280134A CN112280134A CN202011049652.6A CN202011049652A CN112280134A CN 112280134 A CN112280134 A CN 112280134A CN 202011049652 A CN202011049652 A CN 202011049652A CN 112280134 A CN112280134 A CN 112280134A
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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
- C08L15/00—Compositions of rubber derivatives
- C08L15/005—Hydrogenated nitrile rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/02—Layered products comprising a layer of natural or synthetic rubber with fibres or particles being present as additives in the layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/10—Layered products comprising a layer of natural or synthetic rubber next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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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- 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
-
- 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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a tear-resistant rubber plate for a photovoltaic laminating machine, wherein more than one reinforcing mesh layer is clamped in a plate layer of the rubber plate; the rubber plate mainly comprises the following components in parts by weight: 80-100 parts of hydrogenated nitrile rubber, 6-10 parts of tear-resistant resin, 1-5 parts of tear-resistant filler, 10-15 parts of reinforcing filler, 5-10 parts of vulcanizing agent and 1-6 parts of anti-aging agent. According to the rubber plate for the tear-resistant photovoltaic laminator and the preparation method thereof, the formula of the hydrogenated nitrile rubber plate is improved by adding and using the tear-resistant resin, the tear-resistant filler and the reinforcing filler, the structural strength of the hydrogenated nitrile rubber substrate is effectively improved, and particularly the tear strength is obviously improved; through the use of the reinforced net layer, the effects of double reinforcement and tear resistance modification are achieved, the strength and tear resistance of the finished rubber plate are integrally improved, and the obtained tear-resistant rubber plate for the photovoltaic laminating machine is excellent in performance and wide in market prospect.
Description
Technical Field
The invention relates to the technical field of rubber product preparation, in particular to a tear-resistant rubber plate for a photovoltaic laminating machine and a preparation method thereof.
Background
With the rise of the domestic photovoltaic industry, the use frequency of the matched rubber plate of the solar cell panel production equipment is higher and higher, and the quality of the rubber plate is required to be gradually improved so as to reduce the loss frequency of the rubber plate and reduce the production cost.
The rubber plate for the existing photovoltaic laminating machine basically meets the use requirements in the aspects of corrosion resistance, high temperature resistance, wear resistance and the like. However, the existing rubber plate has poor tear resistance, is often torn and damaged in the using process and needs to be replaced frequently, so that the production efficiency is influenced, and the production cost is increased.
Disclosure of Invention
The invention mainly solves the technical problem of providing a tear-resistant rubber plate for a photovoltaic laminating machine and a preparation method thereof, and can solve the defects existing in the use process of the existing rubber plate.
In order to solve the technical problems, the invention adopts a technical scheme that: the tear-resistant rubber plate for the photovoltaic laminating machine is provided, wherein more than one reinforcing net layer is clamped in a plate layer of the rubber plate; the rubber plate mainly comprises the following components in parts by weight:
80-100 parts of hydrogenated nitrile rubber, 6-10 parts of tear-resistant resin, 1-5 parts of tear-resistant filler, 10-15 parts of reinforcing filler, 5-10 parts of vulcanizing agent and 1-6 parts of anti-aging agent.
In a preferred embodiment of the invention, the reinforcing mesh layer is an alkali-free glass fiber mesh layer.
In a preferred embodiment of the present invention, the mesh aperture of the reinforced mesh layer is 1-30 cm.
In a preferred embodiment of the invention, the tear resistant resin is a cyclopentadiene derivative.
In a preferred embodiment of the invention, the tear-resistant filler comprises polypropylene fibers and polypropylene fibers in a mass ratio of 1: 1-1: 3.
In a preferred embodiment of the present invention, the length of the polypropylene fiber is 1-10 cm; the length of the polypropylene fiber is 1-10 cm.
In a preferred embodiment of the invention, the reinforcing filler comprises wollastonite whiskers, nano-montmorillonite and nano-silica in a mass ratio of 1:1:2 to 1:2: 3.
In a preferred embodiment of the invention, the vulcanizing agent is benzoyl peroxide, and the anti-aging agent is anti-aging agent 4010.
In order to solve the technical problem, the invention adopts another technical scheme that: the preparation method of the rubber plate for the tear-resistant photovoltaic laminating machine comprises the following steps:
(1) mixing materials: placing the hydrogenated nitrile rubber, the anti-tear resin, the anti-tear filler, the reinforcing filler and the anti-aging agent in the formula ratio into an internal mixer for internal mixing and mixing until the mixture is uniform;
(2) open milling and sheet discharging: putting the material subjected to banburying mixing in the step (1) into a double-roll open mill, adding a vulcanizing agent in a formula amount, continuously mixing until the mixture is uniform, adjusting the distance between the rolls, and discharging to obtain sheet materials;
(3) and (3) compounding a reinforced net layer: flatly paving the reinforced net layer between the two pieces obtained in the step (2);
(4) and (3) vulcanization: and (4) vulcanizing the composite layer of the reinforced net layer and the sheet material prepared in the step (3) by using a vulcanizing machine, and opening the die to obtain the rubber plate for the tear-resistant photovoltaic laminating machine.
In a preferred embodiment of the present invention, the vulcanization process conditions are as follows: the temperature is 150-155 ℃, the pressure is 3-5 PMa, the time is 20-30 min, and the exhaust frequency is 3-5 times.
The invention has the beneficial effects that: according to the rubber plate for the tear-resistant photovoltaic laminator and the preparation method thereof, the formula of the hydrogenated nitrile rubber plate is improved by adding and using the tear-resistant resin, the tear-resistant filler and the reinforcing filler, the structural strength of the hydrogenated nitrile rubber substrate is effectively improved, and particularly the tear strength is obviously improved; through the use of the reinforced net layer, the effects of double reinforcement and tear resistance modification are achieved, the strength and tear resistance of the finished rubber plate are integrally improved, and the obtained tear-resistant rubber plate for the photovoltaic laminating machine is excellent in performance and wide in market prospect.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
The embodiment of the invention comprises the following steps:
example 1
The invention discloses a tear-resistant rubber plate for a photovoltaic laminating machine, wherein a reinforced net layer, specifically an alkali-free glass fiber net layer, is clamped in a plate layer of the rubber plate, and the aperture of a mesh of the alkali-free glass fiber net layer is 10 cm. The alkali-free glass fiber net layer is clamped in the rubber plate layer, so that the overall structural strength and tear resistance of the rubber plate can be improved; the rubber layers on the upper side and the lower side of the reinforced net layer can be effectively bonded into a whole in the process of pressure vulcanization by limiting the diameter of the meshes of the reinforced net layer.
Specifically, the rubber plate comprises the following components in parts by weight:
90 parts of hydrogenated nitrile rubber;
10 parts of anti-tear resin, wherein the anti-tear resin is cyclopentadiene derivative and polydicyclopentadiene, can be tightly bonded with materials such as rubber and filler in the vulcanization process of hydrogenated nitrile rubber, plays a role in dispersing stress to inhibit the formation and growth of a crack, and can improve the anti-tear performance of the rubber plate;
5 parts of tear-resistant filler, wherein the tear-resistant filler comprises polypropylene fibers and polypropylene fibers in a mass ratio of 1:1, the polypropylene fibers are 5cm in length, the tear resistance of the rubber plate can be improved by adding the two fiber components, and the tear-resistant filler and the reinforced mesh layer clamped in the rubber plate play a role in dual reinforcement and tear resistance. The length of the fiber is between 1cm and 10cm, the fiber is too short when the length is less than 1cm, the influence on the tear resistance is small, the fiber is too long when the length is more than 10cm, the fiber is easy to knot in the mixing process, and the mixing of materials is also influenced.
10 parts of reinforcing filler, wherein the reinforcing filler comprises wollastonite whiskers, nano-montmorillonite and nano-silica in a mass ratio of 1:1:2, the wollastonite whiskers and the nano-montmorillonite have a remarkable influence on the tear resistance improvement due to the structures of the nano-montmorillonite, and the nano-silica has an excellent reinforcing effect and contributes to the improvement of the mechanical strength of the rubber plate.
8 parts of a vulcanizing agent, wherein the vulcanizing agent is benzoyl peroxide;
3 parts of a vulcanization assistant, wherein the vulcanization accelerator is a mixture of zinc stearate and pentaerythritol 2000 in a mass ratio of 1: 2;
5 parts of an anti-aging agent, wherein the anti-aging agent is anti-aging agent 4010.
The preparation method of the rubber plate for the tear-resistant photovoltaic laminating machine comprises the following steps:
(1) mixing materials: placing the hydrogenated nitrile rubber, the anti-tearing resin, the anti-tearing filler, the reinforcing filler and the anti-aging agent in the formula ratio into an internal mixer for internal mixing and mixing until the mixture is uniform, wherein the internal mixing and mixing process conditions are as follows: mixing at the rotation speed of 10r/min for 5min, then accelerating to 25r/min for 3min, and controlling the banburying temperature to be 80-100 ℃;
(2) open milling and sheet discharging: putting the material subjected to banburying mixing in the step (1) into a double-roll open mill, adding a vulcanizing agent and a vulcanization accelerator in a formula amount, continuously mixing until the mixture is uniform, adjusting the distance between the rolls, and discharging to obtain a sheet material;
(3) and (3) compounding a reinforced net layer: flatly paving the reinforced net layer between the two pieces obtained in the step (2);
(4) and (3) vulcanization: and (4) vulcanizing the composite layer of the reinforced net layer and the sheet material prepared in the step (3) by using a vulcanizing machine, and opening the die to obtain the rubber plate for the tear-resistant photovoltaic laminating machine. The vulcanization process conditions are as follows: the temperature is 152 ℃, the pressure is 3PMa, the time is 25min, and the exhaust frequency is 5 times.
Example 2
The invention discloses a tear-resistant rubber plate for a photovoltaic laminating machine, wherein a reinforced net layer, specifically an alkali-free glass fiber net layer, is clamped in a plate layer of the rubber plate, and the aperture of a mesh of the alkali-free glass fiber net layer is 20 cm. The alkali-free glass fiber net layer is clamped in the rubber plate layer, so that the overall structural strength and tear resistance of the rubber plate can be improved; the rubber layers on the upper side and the lower side of the reinforced net layer can be effectively bonded into a whole in the process of pressure vulcanization by limiting the diameter of the meshes of the reinforced net layer.
Specifically, the rubber plate comprises the following components in parts by weight:
100 parts of hydrogenated nitrile rubber;
6 parts of tear-resistant resin, wherein the tear-resistant resin is a cyclopentadiene derivative and polydicyclopentadiene, can be tightly bonded with rubber, filler and other materials in the vulcanization process of hydrogenated nitrile rubber, plays a role in dispersing stress to inhibit the formation and growth of a crack, and can improve the tear resistance of the rubber plate;
3 parts of a tear-resistant filler, wherein the tear-resistant filler comprises polypropylene fibers and polypropylene fibers in a mass ratio of 1: 3. The length of the polypropylene fiber is 8 cm; the length of the polypropylene fiber is 8 cm.
15 parts of reinforcing filler, wherein the reinforcing filler comprises wollastonite whiskers, nano-montmorillonite and nano-silica in a mass ratio of 1:2: 3.
5 parts of vulcanizing agent, wherein the vulcanizing agent is benzoyl peroxide
2 parts of a vulcanization assistant, wherein the vulcanization accelerator is a mixture of zinc stearate and pentaerythritol 2000 in a mass ratio of 1: 2;
3 parts of an anti-aging agent, wherein the anti-aging agent is an anti-aging agent 4010.
The preparation method is the same as example 1, and the vulcanization process conditions are as follows: the temperature is 155 ℃, the pressure is 3PMa, the time is 28min, and the exhaust frequency is 5 times.
Comparative example:
the rubber sheet without the composite reinforcing mesh layer was vulcanized under the same process conditions as in example 1 to obtain a rubber sheet.
The rubber plate for the tear-resistant photovoltaic laminator prepared by the method is subjected to performance test by independently cutting the rubber plate without the reinforced mesh layer part, and the structure is shown in the following table:
the test results in the table show that the structural strength of the hydrogenated nitrile rubber matrix is effectively improved by adding the anti-tearing resin, the anti-tearing filler and the reinforcing filler, and particularly the tearing strength is obviously improved.
After the reinforcing mesh layer is added, the difficulty that the rubber is broken or torn and damaged is higher based on the structural characteristics of the glass fiber mesh, and the test is not carried out at the position.
The rubber plate for the tear-resistant photovoltaic laminator and the preparation method thereof have the following advantages:
1. the structural strength of the hydrogenated nitrile rubber matrix is effectively improved by adding the tear-resistant resin, the tear-resistant filler and the reinforcing filler, and particularly the tear strength is obviously improved;
2. the reinforced net layer is used to achieve the effects of dual reinforcement and tear resistance modification, so that the rubber plate finished product has high strength and tear resistance;
3. the preparation process is simple and easy to operate.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The tear-resistant rubber plate for the photovoltaic laminating machine is characterized in that more than one reinforcing mesh layer is clamped in a plate layer of the rubber plate; the rubber plate mainly comprises the following components in parts by weight:
80-100 parts of hydrogenated nitrile rubber, 6-10 parts of tear-resistant resin, 1-5 parts of tear-resistant filler, 10-15 parts of reinforcing filler, 5-10 parts of vulcanizing agent and 1-6 parts of anti-aging agent.
2. The tear resistant rubber sheet for a photovoltaic laminate of claim 1 wherein the reinforcing web layer is an alkali free glass fiber web layer.
3. The tear-resistant rubber sheet for a photovoltaic laminator according to claim 2, wherein the mesh aperture of the reinforcing mesh layer is 1 to 30 cm.
4. The tear resistant rubber sheet for a photovoltaic laminate as in claim 1 wherein the tear resistant resin is a cyclopentadiene derivative.
5. The tear-resistant rubber sheet for a photovoltaic laminator according to claim 1, wherein the tear-resistant filler comprises polypropylene fibers and polypropylene fibers in a mass ratio of 1:1 to 1: 3.
6. The tear-resistant rubber sheet for a photovoltaic laminator according to claim 5, wherein the polypropylene fibers have a length of 1 to 10 cm; the length of the polypropylene fiber is 1-10 cm.
7. The tear-resistant rubber sheet for the photovoltaic laminator according to claim 1, wherein the reinforcing filler comprises wollastonite whiskers, nano-montmorillonite and nano-silica in a mass ratio of 1:1:2 to 1:2: 3.
8. The tear resistant rubber sheet for a photovoltaic laminate as claimed in claim 1, wherein the vulcanizing agent is benzoyl peroxide and the anti-aging agent is anti-aging agent 4010.
9. A method of making a tear resistant rubber sheet for a photovoltaic laminate as claimed in any one of claims 1 to 8 comprising the steps of:
(1) mixing materials: placing the hydrogenated nitrile rubber, the anti-tear resin, the anti-tear filler, the reinforcing filler and the anti-aging agent in the formula ratio into an internal mixer for internal mixing and mixing until the mixture is uniform;
(2) open milling and sheet discharging: putting the material subjected to banburying mixing in the step (1) into a double-roll open mill, adding a vulcanizing agent in a formula amount, continuously mixing until the mixture is uniform, adjusting the distance between the rolls, and discharging to obtain sheet materials;
(3) and (3) compounding a reinforced net layer: flatly paving the reinforced net layer between the two pieces obtained in the step (2);
(4) and (3) vulcanization: and (4) vulcanizing the composite layer of the reinforced net layer and the sheet material prepared in the step (3) by using a vulcanizing machine, and opening the die to obtain the rubber plate for the tear-resistant photovoltaic laminating machine.
10. The method of making a tear resistant rubber sheet for a photovoltaic laminate of claim 9 wherein the vulcanization process conditions are: the temperature is 150-155 ℃, the pressure is 3-5 PMa, the time is 20-30 min, and the exhaust frequency is 3-5 times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011049652.6A CN112280134A (en) | 2020-09-29 | 2020-09-29 | Tear-resistant rubber plate for photovoltaic laminator and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011049652.6A CN112280134A (en) | 2020-09-29 | 2020-09-29 | Tear-resistant rubber plate for photovoltaic laminator and preparation method thereof |
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| CN112280134A true CN112280134A (en) | 2021-01-29 |
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|---|---|---|---|---|
| US20070184263A1 (en) * | 2005-10-12 | 2007-08-09 | Tesa Ag | Adhesive tape with tear propagation resistance |
| CN101555330A (en) * | 2009-04-22 | 2009-10-14 | 南京固柏橡塑制品有限公司 | Fiber reinforced rubber |
| US20090255039A1 (en) * | 2008-04-10 | 2009-10-15 | Pontus Danielsson | Chemical protective garment with added flash fire protection |
| CN102139546A (en) * | 2010-10-28 | 2011-08-03 | 天津大学 | Glass fiber reinforced heat-conducting insulation silicon rubber composite material and preparation method thereof |
| CN109705414A (en) * | 2018-12-27 | 2019-05-03 | 广州弗西林橡塑有限公司 | A kind of quartering hammer height tearing rubber cup material and preparation method thereof |
-
2020
- 2020-09-29 CN CN202011049652.6A patent/CN112280134A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070184263A1 (en) * | 2005-10-12 | 2007-08-09 | Tesa Ag | Adhesive tape with tear propagation resistance |
| US20090255039A1 (en) * | 2008-04-10 | 2009-10-15 | Pontus Danielsson | Chemical protective garment with added flash fire protection |
| CN101555330A (en) * | 2009-04-22 | 2009-10-14 | 南京固柏橡塑制品有限公司 | Fiber reinforced rubber |
| CN102139546A (en) * | 2010-10-28 | 2011-08-03 | 天津大学 | Glass fiber reinforced heat-conducting insulation silicon rubber composite material and preparation method thereof |
| CN109705414A (en) * | 2018-12-27 | 2019-05-03 | 广州弗西林橡塑有限公司 | A kind of quartering hammer height tearing rubber cup material and preparation method thereof |
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| 常冠军: "《橡胶常用数据速查手册》", 31 October 2012, 国防工业出版社 * |
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Application publication date: 20210129 |