CN106633435A - Ethylene-propylene-diene-terpolymer rubber cold-contraction pipe suitable for high-temperature storage and low-temperature installation and preparation method - Google Patents
Ethylene-propylene-diene-terpolymer rubber cold-contraction pipe suitable for high-temperature storage and low-temperature installation and preparation method Download PDFInfo
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- CN106633435A CN106633435A CN201611243851.4A CN201611243851A CN106633435A CN 106633435 A CN106633435 A CN 106633435A CN 201611243851 A CN201611243851 A CN 201611243851A CN 106633435 A CN106633435 A CN 106633435A
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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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
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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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- 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
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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
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Abstract
An ethylene-propylene-diene-terpolymer rubber cold-contraction pipe suitable for high-temperature storage and low-temperature installation is prepared from, by weight, 100 parts of ethylene-propylene-diene-terpolymer rubber, 35-55 parts of reinforcing filler, 10-30 parts of non-reinforcing filler, 20-60 parts of plasticizer, 1.5-4.5 parts of vulcanizing agent, 2-6 parts of vulcanizing additive and 6-15 parts of functional additive. The ethylene-propylene-diene-terpolymer rubber is prepared by combining single non-oil-filled ethylene-propylene-diene-terpolymer rubber, or non-oil-filled ethylene-propylene-diene-terpolymer rubber and oil-filled ethylene-propylene-diene-terpolymer rubber. The Mooney viscosity of the oil-filled ethylene-propylene-diene-terpolymer rubber is 40-60, the ethylene content is 40-55%, the third monomer content is 4-7%, the non-oil-filled ethylene-propylene-diene-terpolymer rubber is controllable long-chain branched, the Mooney viscosity of the rubber is 75-95, the ethylene content is 45-60%, the third monomer content is 4.5-9%, and the reinforcing filler is a mixture of one or more of carbon black and white carbon black. The ethylene-propylene-diene-terpolymer rubber cold-contraction pipe can achieve the functions of high temperature storage, low temperature installation and application and the like and can adapt to some complicated high temperature and low temperature alternated environments.
Description
Technical field
The present invention relates to a kind of ethylene propylene diene rubber class cold shrink tube and preparation method thereof.
Background technology
At present, silastic material is used mostly in domestic shrinkage class cable accessory, but silicone rubber material price is higher, and
The equal Shortcomings of resistance to puncturing property, impact resistance, resistance to acids and bases, wear resistence, these shortcomings limit its use range.
Compared with silicon rubber, ethylene propylene diene rubber has advantages below：1. under identical expansion multiplying power, its stress at definite elongation
Greatly, therefore bigger radial pressure can be produced when shrinking, it is ensured that lower office's zoom level, water proofing property and operational reliability；
2. less expensive price；3. more excellent puncture resistance energy and resistance to tearing；4. in the presence of thermal field, remain to keep compared with
High radial pressure.Therefore, the cold-shrink article of ethylene propylene diene rubber class has silicone rubber kinds cold in some cable accessory fields
The irreplaceable status of contraction product.
But the cold-shrink article of some ethylene propylene diene rubber classes expanded using big multiplying power is easily ftractureed in high temperature storage, or
Even if do not ftracture also being difficult to ensure that shrinkage good at low temperature, so as to affect product use at low ambient temperatures.
The content of the invention
The technical problem to be solved in the present invention is：Existing ethylene propylene diene rubber cold shrink tube is overcome easily to open in high temperature storage
Split, even if or do not ftracture and be difficult to ensure that inotropic defect good at low temperature yet, propose that a kind of to be applied to high temperature storage low
Temperature install ethylene propylene diene rubber cold shrink tube, can not only install under conventional environment and apply, and can also realize high temperature storage,
The function such as low-temperature mounting and application, is adapted to the environment of some complicated high/low temperature alternations.
In order to solve above-mentioned technical problem, the present invention proposes following technical proposal：It is a kind of to pacify suitable for high temperature storage low temperature
The ethylene propylene diene rubber cold shrink tube of dress, it is made up of following component in parts by weight：
Described ethylene propylene diene rubber by single non-oil-filled type ethylene propylene diene rubber, or by non-oil-filled type EPDM
Rubber is combined with oil-filled type ethylene propylene diene rubber；
Between 40-60, ethylene contents are 40-55% to the Mooney viscosity of the oil-filled type ethylene propylene diene rubber, and the 3rd is single
Body content is 4-7%；
The non-EP rubbers of oil-filled type three be controllable long chain branching type and Mooney viscosity between 75-95, ethylene contents
For 45-60%, Third monomer content is 4.5-9%；
Described reinforced filling is the mixture of one or more in following material：Carbon black, white carbon；
Described dis-reinforcing filler is the mixture of one or more in following material：Potter's clay, talcum powder, calcium carbonate；
The plasticizer is the mixture of one or more in following material：Paraffin oil, poly ＆ Alpha ,-olefin oil, naphthenic oil；
The vulcanizing agent is the mixture of one or more in following material：Cumyl peroxide；Double (the tertiary fourths of 1,3-
Peroxy isopropyl base) benzene；Double (tert-butyl peroxy isopropyl) benzene of 1,4-；1,1- dual-tert-butyl peroxy -3,3,5- trimethyl-cyclohexanes；
2,5- dimethyl -2,5- two (t-butylperoxy) hexane；
The vulcanization aid is the mixture of one or more in following material：Iso-cyanuric acid triallyl ester；N,
N '-metaphenylene dimaleimide；Trimethylol-propane trimethacrylate；Dimethacrylate；It is poly-
Butadiene resin；Zinc methacrylate；Zinc acrylate resin；
The function additive is two or more the mixture in following material：It is activated zinc oxide, stearic acid, poly-
Ethylene glycol, anti-aging agent RD and antioxidant MB Z.
In order to solve above-mentioned technical problem, the present invention proposes following technical proposal：It is a kind of to pacify suitable for high temperature storage low temperature
The preparation method of the ethylene propylene diene rubber cold shrink tube of dress, comprises the following steps：
Step 1：Prepare elastomeric compound：Ethylene propylene diene rubber is added in mill or banbury and is plasticated；
Reinforced filling, dis-reinforcing filler and plasticizer are added in mill or banbury and are kneaded；
Function additive is added in mill or banbury and is kneaded；
Vulcanizing agent and vulcanization aid are added in mill or banbury and are kneaded；
Step 2：Rubber vulcanization：The sizing material that step 1 is obtained is sulfided into pipe by press moulding mode or injection moulding, its
In, molding curing temperature is 160-185 DEG C, and cure time is 6-20 minutes, and injection moulding adopts multimode cavity mode, wherein
Upper and lower mould temperature is 170-190 DEG C, and cure time is 8-20 minutes；
Step 3：Tubing is expanded：Tubing after step 2 is vulcanized passes through expansion device expanding and shaping.
Compared with prior art, the invention has the advantages that：The present invention is suitable for high temperature storage low-temperature mounting
Ethylene propylene diene rubber cold shrink tube, can not only at normal temperatures have preferable application, and can be under some extreme weather conditions
Also have good high-temperature storage characteristics (not ftractureing) and cold snap-back, particularly production tube after high-temperature storage still
So there is good cold snap-back.
Specific embodiment
A kind of ethylene propylene diene rubber cold shrink tube suitable for high temperature storage low-temperature mounting, its by it is following in parts by weight
Component composition：
Described ethylene propylene diene rubber by single non-oil-filled type ethylene propylene diene rubber, or by non-oil-filled type EPDM
Rubber is combined with oil-filled type ethylene propylene diene rubber.
Between 40-60, ethylene contents are 40-55% to the Mooney viscosity of the oil-filled type ethylene propylene diene rubber, and the 3rd is single
Body content is 4-7%.
The non-EP rubbers of oil-filled type three be controllable long chain branching type and Mooney viscosity between 75-95, ethylene contents
For 45-60%, Third monomer content is 4.5-9%.
Described reinforced filling is the mixture of one or more in following material：Carbon black, white carbon.
Described dis-reinforcing filler is the mixture of one or more in following material：Potter's clay, talcum powder, calcium carbonate.
The plasticizer is the mixture of one or more in following material：Paraffin oil, poly ＆ Alpha ,-olefin oil, naphthenic oil.
The vulcanizing agent is the mixture of one or more in following material：Cumyl peroxide；Double (the tertiary fourths of 1,3-
Peroxy isopropyl base) benzene；Double (tert-butyl peroxy isopropyl) benzene of 1,4-；1,1- dual-tert-butyl peroxy -3,3,5- trimethyl-cyclohexanes；
2,5- dimethyl -2,5- two (t-butylperoxy) hexane.
The vulcanization aid is the mixture of one or more in following material：Iso-cyanuric acid triallyl ester；N,
N '-metaphenylene dimaleimide；Trimethylol-propane trimethacrylate；Dimethacrylate；It is poly-
Butadiene resin；Zinc methacrylate；Zinc acrylate resin.
The function additive is two or more the mixture in following material：It is activated zinc oxide, stearic acid, poly-
Ethylene glycol, anti-aging agent RD (2,2,4- trimethyl -1,2- dihyaroquinoline condensates) and antioxidant MB Z (2-mercaptobenzimidazoles
Zinc salt).
The preparation method of the above-mentioned ethylene propylene diene rubber cold shrink tube suitable for high temperature storage low-temperature mounting, including following step
Suddenly：
Step 1：Prepare elastomeric compound：Ethylene propylene diene rubber is added in mill or banbury and is plasticated；
Reinforced filling, dis-reinforcing filler and plasticizer are added in mill or banbury and are kneaded；
Function additive is added in mill or banbury and is kneaded；
Vulcanizing agent and vulcanization aid are added in mill or banbury and are kneaded；
Step 2：Rubber vulcanization：The sizing material that step 1 is obtained is sulfided into pipe by press moulding mode or injection moulding, its
In, molding curing temperature is 160-185 DEG C, and cure time is 6-20 minutes, and injection moulding adopts multimode cavity mode, wherein
Upper and lower mould temperature is 170-190 DEG C, cure time is 8-20 minutes；
Step 3：Tubing is expanded：Tubing after step 2 is vulcanized passes through expansion device expanding and shaping.
Embodiment one
Prepare elastomeric compound：By weight, by 100 parts of ethylene propylene diene rubber【Using non-oil-filled type ethylene propylene diene rubber 50
Part, 100 parts of oil-filled type ethylene propylene diene rubber (wherein 50 parts of rubber, is in addition 50 parts of oil)】, 35 parts of reinforced filling (adopt hard charcoal
Black 10 parts, 25 parts of carbon black), 30 parts of dis-reinforcing filler (adopt 30 parts of calcinated argil), 20 parts of plasticizer (adopting 20 parts of paraffin oil),
6 parts of function additive (adopting 5 parts of activated zinc oxide, 1 part of anti-aging agent RD), 1.5 parts of vulcanizing agent (adopt cumyl peroxide 1.5
Part), 3 parts of vulcanization aid (adopt 3 parts of iso-cyanuric acid triallyl ester) mixing it is uniform；
Sulfuration：Using molding or injection moulding mode, curing temperature is 170 DEG C, and cure time is 12 minutes；
Tubing is expanded：Tubing passes through expansion device expanding and shaping after vulcanizing.
Embodiment two
Prepare elastomeric compound：By weight, by 100 parts of ethylene propylene diene rubber【Using non-oil-filled type ethylene propylene diene rubber 40
Part, 90 parts of oil-filled type ethylene propylene diene rubber (wherein 60 parts of rubber, is in addition 30 parts of oil)】, 50 parts of reinforced filling (adopt white carbon
15 parts, 35 parts of carbon black), 10 parts of dis-reinforcing filler (adopt 10 parts of calcinated argil), 35 parts of plasticizer (adopting 35 parts of paraffin oil), work(
Can 9 parts of auxiliary agent (adopting 5 parts of activated zinc oxide, 1 part of stearic acid, 2 parts of nertralizer PEG4000,1 part of antioxidant MB Z), vulcanizing agent
2 parts of (using double 2 parts of (tert-butyl peroxy isopropyl) benzene of 1,3-), 6 parts of vulcanization aids (adopt trimethylol propane trimethyl acrylic acid
6 parts of ester) mixing is uniformly；
Using molding or injection moulding mode, curing temperature is 180 DEG C, and cure time is 8 minutes；
Tubing is expanded：Tubing passes through expansion device expanding and shaping after vulcanizing.
Embodiment three
Prepare elastomeric compound：By weight, by 100 parts of ethylene propylene diene rubber【Using non-oil-filled type ethylene propylene diene rubber 70
Part, 60 parts of oil-filled type ethylene propylene diene rubber (wherein 30 parts of rubber, is in addition 30 parts of oil)】, 55 parts of reinforced filling (adopt white carbon
15 parts, 40 parts of carbon black), 20 parts of dis-reinforcing filler (adopt 20 parts of calcinated argil), 30 parts of plasticizer (adopting 30 parts of naphthenic oil), work(
Can 10 parts of auxiliary agent (adopting 6 parts of activated zinc oxide, 1 part of stearic acid, 2 parts of nertralizer PEG4000,1 part of anti-aging agent RD), vulcanizing agent
2.5 parts of (using double 2.5 parts of (tert-butyl peroxy isopropyl) benzene of 1,3-), 2 parts of vulcanization aids (adopt diethylene glycol dimethacrylate
Ester 2) mixing is uniformly；
Using molding or injection moulding mode, curing temperature is 165 DEG C, and cure time is 20 minutes；
Tubing is expanded：Tubing passes through expansion device expanding and shaping after vulcanizing.
Example IV
Prepare elastomeric compound：By weight, by non-100 parts of oil-filled type ethylene propylene diene rubber, 50 parts of reinforced filling (using white
15 parts of carbon black, 35 parts of carbon black), 15 parts of dis-reinforcing filler (adopt 15 parts of calcinated argil), 60 parts of plasticizer (adopt paraffin oil 60
Part), 15 parts of function additive (adopts 8 parts of activated zinc oxide, 2 parts of stearic acid, 3 parts of nertralizer PEG4000, antioxidant MB Z 2
Part), 4.5 parts of vulcanizing agent (adopt 4.5 parts of 2,5- dimethyl -2,5- two (t-butylperoxy) hexane), 5 parts of vulcanization aid (adopt
With N, N ' -5 parts of metaphenylene dimaleimide) mixing is uniformly；
Using molding or injection moulding mode, curing temperature is 185 DEG C, and cure time is 8 minutes；
Tubing is expanded：Tubing passes through expansion device expanding and shaping after vulcanizing.
Embodiment five
Prepare elastomeric compound：By weight, by non-100 parts of oil-filled type ethylene propylene diene rubber, 50 parts of reinforced filling (using white
10 parts of carbon black, 40 parts of carbon black), 20 parts of dis-reinforcing filler (adopt 20 parts of calcinated argil), 40 parts of low viscosity plasticizer (using poly- α-
40 parts of alkene oil), 12 parts of function additive (adopts 6 parts of activated zinc oxide, 2 parts of stearic acid, 2 parts of nertralizer PEG4000, age resistor
1 part of MBZ, 1 part of anti-aging agent RD), 3 parts of vulcanizing agent (adopt 3 parts of 1,1- dual-tert-butyl peroxy -3,3,5- trimethyl-cyclohexanes),
3.6 parts of vulcanization aid (adopting 3.6 parts of polybutadiene) mixing is uniform；
Using molding or injection moulding mode, curing temperature is 160 DEG C, and cure time is 10 minutes；
Tubing is expanded：Tubing passes through expansion device expanding and shaping after vulcanizing.
Five kinds of experimental example test data results are as follows：
The embodiment test data result of table 1.
Remarks：" 60 DEG C of storages " refers to storage 48 hours in 60 DEG C of baking ovens, and other temperature are by that analogy；The shrinkage of its test
Internal diameter is 7.5mm before enlargement of pipe, and internal diameter is 29mm after expansion, and expansion multiplying power is 4.4 times.
Sample test method：
(1) finished product cold shrink tube high temperature storage test：Ten production tubes are respectively placed in into 60 DEG C, 70 DEG C, 80 DEG C and 90 DEG C
In baking oven, store 48 hours, count the quantity that do not ftracture；Its storage percent of pass can be calculated with equation below and obtained：
(2) test of low-temperature shrink rate：By the sample after room temperature or high temperature storage, -20 DEG C of environment are positioned over
Under, support bar is detached after insulation 2h, sample starts retraction, contraction inner diameter values of the test sample after two hours.Its low-temperature shrink rate
Computing formula is as follows：
Wherein, λ is shrinkage factor；D0For the internal diameter before shrinkage enlargement of pipe；D1Internal diameter is shunk for cold shrink tube；D2For cold shrink tube expansion
Internal diameter after.
Claims (2)
1. a kind of ethylene propylene diene rubber cold shrink tube suitable for high temperature storage low-temperature mounting, its by it is following in parts by weight
Component is constituted：
100 parts of ethylene propylene diene rubber；
Reinforced filling 35-55 parts；
Dis-reinforcing filler 10-30 parts
Plasticizer 20-60 parts；
Vulcanizing agent 1.5-4.5 parts；
Vulcanization aid 2-6 parts；
Function additive 6-15 parts；
Described ethylene propylene diene rubber by single non-oil-filled type ethylene propylene diene rubber, or by non-oil-filled type ethylene propylene diene rubber
Combine with oil-filled type ethylene propylene diene rubber；
Between 40-60, ethylene contents are 40-55% to the Mooney viscosity of the oil-filled type ethylene propylene diene rubber, Third monomer content
For 4-7%；
The non-EP rubbers of oil-filled type three be controllable long chain branching type and Mooney viscosity between 75-95, ethylene contents are 45-
60%, Third monomer content is 4.5-9%；
Described reinforced filling is the mixture of one or more in following material：Carbon black, white carbon；
Described dis-reinforcing filler is the mixture of one or more in following material：Potter's clay, talcum powder, calcium carbonate；
The plasticizer is the mixture of one or more in following material：Paraffin oil, poly ＆ Alpha ,-olefin oil, naphthenic oil；
The vulcanizing agent is the mixture of one or more in following material：Cumyl peroxide；1,3- is double（Tert-butyl peroxy
Isopropyl）Benzene；1,4- is double（Tert-butyl peroxy isopropyl）Benzene；1,1- dual-tert-butyl peroxy -3,3,5- trimethyl-cyclohexanes；2,5-
Dimethyl -2,5- two（T-butylperoxy）Hexane；
The vulcanization aid is the mixture of one or more in following material：Iso-cyanuric acid triallyl ester；N, N '-
Phenylene dimaleimide；Trimethylol-propane trimethacrylate；Dimethacrylate；Polybutadiene
Resin；Zinc methacrylate；Zinc acrylate resin；
The function additive is two or more the mixture in following material：Activated zinc oxide, stearic acid, poly- second two
Alcohol, anti-aging agent RD and antioxidant MB Z.
2. a kind of preparation side of the ethylene propylene diene rubber cold shrink tube suitable for high temperature storage low-temperature mounting as claimed in claim 1
Method, it is characterised in that comprise the following steps：
Step 1：Prepare elastomeric compound：Ethylene propylene diene rubber is added in mill or banbury and is plasticated；
Reinforced filling, dis-reinforcing filler and plasticizer are added in mill or banbury and are kneaded；
Function additive is added in mill or banbury and is kneaded；
Vulcanizing agent and vulcanization aid are added in mill or banbury and are kneaded；
Step 2：Rubber vulcanization：The sizing material that step 1 is obtained is sulfided into pipe by press moulding mode or injection moulding, wherein, mould
Pressure curing temperature is 160-185 DEG C, and cure time is 6-20 minutes, and injection moulding adopts multimode cavity mode, wherein up and down
Mould temperature is 170-190 DEG C, and cure time is 8-20 minutes；
Step 3：Tubing is expanded：Tubing after step 2 is vulcanized passes through expansion device expanding and shaping.
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| CN201611243851.4A CN106633435A (en) | 2016-12-28 | 2016-12-28 | Ethylene-propylene-diene-terpolymer rubber cold-contraction pipe suitable for high-temperature storage and low-temperature installation and preparation method |
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| CN201611243851.4A CN106633435A (en) | 2016-12-28 | 2016-12-28 | Ethylene-propylene-diene-terpolymer rubber cold-contraction pipe suitable for high-temperature storage and low-temperature installation and preparation method |
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| CN107629338A (en) * | 2017-10-18 | 2018-01-26 | 浙江德首新型建材有限公司 | Low temperature impact tubing and preparation method thereof |
| CN108410073A (en) * | 2018-04-03 | 2018-08-17 | 山东华凌电缆有限公司 | A kind of EP rubbers cold shrink tube and preparation method thereof |
| CN109401085A (en) * | 2018-11-28 | 2019-03-01 | 陕西秦垒建设集团有限公司 | A kind of EPT rubber packing item and preparation method thereof |
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| CN112126166A (en) * | 2020-09-29 | 2020-12-25 | 一汽解放汽车有限公司 | Ethylene propylene diene monomer composition, rubber tube, and preparation method and application thereof |
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| CN116021815A (en) * | 2022-12-27 | 2023-04-28 | 义博通信设备集团股份有限公司 | High-adaptability cold shrink tube preparation processing method |
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| CN113294601A (en) * | 2021-05-31 | 2021-08-24 | 东风商用车有限公司 | Automobile water delivery rubber pipe with wide application temperature range and preparation method thereof |
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Application publication date: 20170510 |