CN106751294A - A kind of high strength acrylic acid esters sizing material and preparation method and application - Google Patents
A kind of high strength acrylic acid esters sizing material and preparation method and application Download PDFInfo
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- CN106751294A CN106751294A CN201611016296.1A CN201611016296A CN106751294A CN 106751294 A CN106751294 A CN 106751294A CN 201611016296 A CN201611016296 A CN 201611016296A CN 106751294 A CN106751294 A CN 106751294A
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- age resistor
- sizing material
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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
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
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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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
Abstract
The invention discloses a kind of high strength acrylic acid esters sizing material and preparation method and application, the sizing material in parts by weight, is made up of following raw material：100 parts of ACM, 20~28 parts of butadiene rubber, 8~14 parts of neoprene, 24~30 parts of high wear-resistant carbon black, 6~10 parts of semi-reinforcing hydrocarbon black, 1.2~1.6 parts of butyl stearate, 2.1~2.5 parts of ATBC, 2.0~3.2 parts of amino chemically bonded silica, 7~11 parts of glass dust, 445 2.2~2.6 parts of age resistor, 1.0~1.5 parts of age resistor IPPD, 1.4~1.8 parts of antioxidant NBC, 1.5~2.2 parts of zinc oxide, 1.0~1.3 parts of enuatrol, 5.4~6.2 parts of sulphur, 1.8~2.4 parts of accelerator DZ.The present invention is with butadiene rubber, neoprene and ACM compounding use, it is adaptable to make automobile oil seal seal.
Description
Technical field
The present invention relates to new material technology field, specifically a kind of high strength acrylic acid esters sizing material and preparation method thereof and should
With.
Background technology
It with acrylate is main monomer through elastomer obtained by copolymerization that ACM (hereinafter referred to as ACM) is, its master
Chain is saturated carbon chains, and side base is polar ester groups.Due to special construction assign its it is many excellent the characteristics of, such as：Heat-resisting, ageing-resistant,
Oil resistant, resistance to ozone, uvioresistant etc., mechanical property and processing characteristics be better than fluorubber and silicon rubber, its heat-resisting, resistance to ag(e)ing and
Oil resistivity is better than nitrile rubber.ACM is widely used in various high temperature, resistance to oil environment, focuses on as auto industry in recent years
A kind of encapsulant promoted is developed, particularly for high temperature resistant oil sealing, bent axle, valve rod, cylinder liner, the hydraulic oil pipeline of automobile
Deng.However, the shortcoming that lower temperature resistance is poor, mechanical performance is poor existing for ACM, also greatly limit it right
Application in terms of requirement of mechanical strength automobile oil seal seal higher.
The content of the invention
It is an object of the invention to provide a kind of high strength acrylic acid esters sizing material suitable for automobile oil seal seal and its
Preparation method and application.
To achieve the above object, the present invention provides following technical scheme：
A kind of high strength acrylic acid esters sizing material, in parts by weight, is made up of following raw material：ACM 100
Part, 20~28 parts of butadiene rubber, 8~14 parts of neoprene, 24~30 parts of high wear-resistant carbon black, 6~10 parts of semi-reinforcing hydrocarbon black,
1.2~1.6 parts of butyl stearate, 2.1~2.5 parts of ATBC, 2.0~3.2 parts of amino chemically bonded silica, glass
7~11 parts of glass powder, 445 2.2~2.6 parts of age resistor, 1.0~1.5 parts of age resistor IPPD, 1.4~1.8 parts of antioxidant NBC,
1.5~2.2 parts of zinc oxide, 1.0~1.3 parts of enuatrol, 5.4~6.2 parts of sulphur, 1.8~2.4 parts of accelerator DZ.
As further scheme of the invention：In parts by weight, it is made up of following raw material：ACM 100
Part, 22~25 parts of butadiene rubber, 10~13 parts of neoprene, 25~28 parts of high wear-resistant carbon black, semi-reinforcing hydrocarbon black 8~10
Part, 1.4~1.5 parts of butyl stearate, 2.2~2.4 parts of ATBC, 2.6~3.0 parts of amino chemically bonded silica,
8~10 parts of glass dust, 445 2.4~2.5 parts of age resistor, 1.2~1.4 parts of age resistor IPPD, antioxidant NBC 1.5~1.6
Part, 1.8~2.0 parts of zinc oxide, 1.1~1.2 parts of enuatrol, 5.8~6.0 parts of sulphur, 2.0~2.2 parts of accelerator DZ.
As further scheme of the invention：In parts by weight, it is made up of following raw material：ACM 100
Part, 24 parts of butadiene rubber, 12 parts of neoprene, 26 parts of high wear-resistant carbon black, 9 parts of semi-reinforcing hydrocarbon black, butyl stearate 1.4
It is part, 2.3 parts of ATBC, 2.8 parts of amino chemically bonded silica, 9 parts of glass dust, 445 2.5 parts of age resistor, anti-old
1.3 parts of agent IPPD, 1.5 parts of antioxidant NBC, 1.9 parts of zinc oxide, 1.1 parts of enuatrol, 5.9 parts of sulphur, accelerator DZ
2.1 parts.
The preparation method of described high strength acrylic acid esters sizing material, comprises the following steps：
(1) high wear-resistant carbon black, semi-reinforcing hydrocarbon black, glass dust, amino chemically bonded silica are preheated to 140~145 DEG C, will
Butyl stearate, ATBC, age resistor 445, age resistor IPPD, antioxidant NBC are preheated to 135~140 DEG C, standby；
(2) in proportion by ACM, butadiene rubber, neoprene mix, microwave power be 380~420W,
Microwave frequency obtains first compound to carry out 2~3min of heating using microwave under conditions of 5~7GHz；
(3) raw material then in proportion by preheating in step (1) is poured into the first compound of step (2), is continued micro-
Wave power be 350~380W, microwave frequency be 8~10GHz under conditions of carry out 1~2min of heating using microwave, obtain secondary mixing
Material；
(4) and then toward addition zinc oxide, enuatrol, sulphur, accelerator DZ in the secondary mixed material of step (3), in temperature
Be 168~172 DEG C, pressure be to carry out 2.0~2.5min of vulcanization under conditions of 20~22MPa, natural cooling is obtained described height
Strength propylene acid esters sizing material.
Application of the described high strength acrylic acid esters sizing material in terms of automobile oil seal seal is prepared.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is from butadiene rubber, neoprene and acrylic acid
Ester rubber compounding use, using amino chemically bonded silica and the mixed filler of glass dust, using age resistor 445, prevents
The mixture of old agent IPPD and antioxidant NBC three is not changing the heat-resisting of ACM, oil resistant, resistance to as age resistor
On the basis of ageing properties, its low temperature cold tolerance and mechanical performance are improved.Compared with traditional ACM,
Cold resistance and mechanical performance are significantly improved, and brittleness temperature may be up to -55 DEG C without fracture and oil resistant, and ageing-resistant performance is still
Well, compensate for ACM and use upper deficiency, and the performance such as the oil resistant of rubber, heat-resisting, ageing-resistant without obvious
Change, meet oil resistant, heat-resisting, ageing-resistant performance, the requirement of mechanical performance of automobile oil seal seal.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
Embodiment 1
In the embodiment of the present invention, a kind of high strength acrylic acid esters sizing material in parts by weight, is made up of following raw material：Third
100 parts of olefin(e) acid ester rubber, 20 parts of butadiene rubber, 14 parts of neoprene, 24 parts of high wear-resistant carbon black, 10 parts of semi-reinforcing hydrocarbon black,
1.2 parts of butyl stearate, 2.5 parts of ATBC, 2.0 parts of amino chemically bonded silica, 11 parts of glass dust, age resistor
445 2.2 parts, 1.5 parts of age resistor IPPD, 1.4 parts of antioxidant NBC, 2.2 parts of zinc oxide, 1.0 parts of enuatrol, sulphur 6.2
Part, 1.8 parts of accelerator DZ.
The preparation method of described high strength acrylic acid esters sizing material, comprises the following steps：
(1) high wear-resistant carbon black, semi-reinforcing hydrocarbon black, glass dust, amino chemically bonded silica are preheated to 140 DEG C, by tristearin
Acid butyl ester, ATBC, age resistor 445, age resistor IPPD, antioxidant NBC are preheated to 140 DEG C, standby；
(2) ACM, butadiene rubber, neoprene are mixed in proportion, is 380W, Microwave Frequency in microwave power
Rate obtains first compound to carry out heating using microwave 2min under conditions of 7GHz；
(3) raw material then in proportion by preheating in step (1) is poured into the first compound of step (2), is continued micro-
Wave power be 380W, microwave frequency be 8GHz under conditions of carry out heating using microwave 2min, obtain secondary mixed material；
(4) and then toward addition zinc oxide, enuatrol, sulphur, accelerator DZ in the secondary mixed material of step (3), in temperature
Be 168 DEG C, pressure be to carry out vulcanization 2.0min under conditions of 22MPa, natural cooling is obtained described high strength acrylic acid esters glue
Material.
Embodiment 2
In the embodiment of the present invention, a kind of high strength acrylic acid esters sizing material in parts by weight, is made up of following raw material：Third
It is 100 parts of olefin(e) acid ester rubber, 28 parts of butadiene rubber, 8 parts of neoprene, 30 parts of high wear-resistant carbon black, 6 parts of semi-reinforcing hydrocarbon black, hard
1.6 parts of resin acid butyl ester, 2.1 parts of ATBC, 3.2 parts of amino chemically bonded silica, 7 parts of glass dust, age resistor 445
2.6 parts, 1.0 parts of age resistor IPPD, 1.8 parts of antioxidant NBC, 1.5 parts of zinc oxide, 1.3 parts of enuatrol, 5.4 parts of sulphur,
2.4 parts of accelerator DZ.
The preparation method of described high strength acrylic acid esters sizing material, it is same as Example 1.
Embodiment 3
In the embodiment of the present invention, a kind of high strength acrylic acid esters sizing material in parts by weight, is made up of following raw material：Third
100 parts of olefin(e) acid ester rubber, 22 parts of butadiene rubber, 13 parts of neoprene, 25 parts of high wear-resistant carbon black, 10 parts of semi-reinforcing hydrocarbon black,
1.4 parts of butyl stearate, 2.4 parts of ATBC, 2.6 parts of amino chemically bonded silica, 10 parts of glass dust, age resistor
445 2.4 parts, 1.4 parts of age resistor IPPD, 1.5 parts of antioxidant NBC, 2.0 parts of zinc oxide, 1.1 parts of enuatrol, sulphur 6.0
Part, 2.0 parts of accelerator DZ.
The preparation method of described high strength acrylic acid esters sizing material, comprises the following steps：
(1) high wear-resistant carbon black, semi-reinforcing hydrocarbon black, glass dust, amino chemically bonded silica are preheated to 145 DEG C, by tristearin
Acid butyl ester, ATBC, age resistor 445, age resistor IPPD, antioxidant NBC are preheated to 135 DEG C, standby；
(2) ACM, butadiene rubber, neoprene are mixed in proportion, is 420W, Microwave Frequency in microwave power
Rate obtains first compound to carry out heating using microwave 3min under conditions of 5GHz；
(3) raw material then in proportion by preheating in step (1) is poured into the first compound of step (2), is continued micro-
Wave power be 350W, microwave frequency be 10GHz under conditions of carry out heating using microwave 1min, obtain secondary mixed material；
(4) and then toward addition zinc oxide, enuatrol, sulphur, accelerator DZ in the secondary mixed material of step (3), in temperature
Be 172 DEG C, pressure be to carry out vulcanization 2.5min under conditions of 20MPa, natural cooling is obtained described high strength acrylic acid esters glue
Material.
Embodiment 4
In the embodiment of the present invention, a kind of high strength acrylic acid esters sizing material in parts by weight, is made up of following raw material：Third
100 parts of olefin(e) acid ester rubber, 25 parts of butadiene rubber, 10 parts of neoprene, 28 parts of high wear-resistant carbon black, 8 parts of semi-reinforcing hydrocarbon black,
1.5 parts of butyl stearate, 2.2 parts of ATBC, 3.0 parts of amino chemically bonded silica, 8 parts of glass dust, age resistor
445 2.5 parts, 1.2 parts of age resistor IPPD, 1.6 parts of antioxidant NBC, 1.8 parts of zinc oxide, 1.2 parts of enuatrol, sulphur 5.8
Part, 2.2 parts of accelerator DZ.
The preparation method of described high strength acrylic acid esters sizing material, it is same as Example 3.
Embodiment 5
In the embodiment of the present invention, a kind of high strength acrylic acid esters sizing material in parts by weight, is made up of following raw material：Third
100 parts of olefin(e) acid ester rubber, 24 parts of butadiene rubber, 12 parts of neoprene, 26 parts of high wear-resistant carbon black, 9 parts of semi-reinforcing hydrocarbon black,
1.4 parts of butyl stearate, 2.3 parts of ATBC, 2.8 parts of amino chemically bonded silica, 9 parts of glass dust, age resistor
445 2.5 parts, 1.3 parts of age resistor IPPD, 1.5 parts of antioxidant NBC, 1.9 parts of zinc oxide, 1.1 parts of enuatrol, sulphur 5.9
Part, 2.1 parts of accelerator DZ.
The preparation method of described high strength acrylic acid esters sizing material, comprises the following steps：
(1) high wear-resistant carbon black, semi-reinforcing hydrocarbon black, glass dust, amino chemically bonded silica are preheated to 142 DEG C, by tristearin
Acid butyl ester, ATBC, age resistor 445, age resistor IPPD, antioxidant NBC are preheated to 138 DEG C, standby；
(2) ACM, butadiene rubber, neoprene are mixed in proportion, is 400W, Microwave Frequency in microwave power
Rate obtains first compound to carry out heating using microwave 2.5min under conditions of 6GHz；
(3) raw material then in proportion by preheating in step (1) is poured into the first compound of step (2), is continued micro-
Wave power be 360W, microwave frequency be 9GHz under conditions of carry out heating using microwave 1.5min, obtain secondary mixed material；
(4) and then toward addition zinc oxide, enuatrol, sulphur, accelerator DZ in the secondary mixed material of step (3), in temperature
Be 170 DEG C, pressure be to carry out vulcanization 2.2min under conditions of 21MPa, natural cooling is obtained described high strength acrylic acid esters glue
Material.
Comparative example 1
On the basis of the formula of embodiment 5, amino chemically bonded silica is replaced with into glass dust, remaining is complete with embodiment 5
It is exactly the same.
Comparative example 2
On the basis of the formula of embodiment 5, age resistor IPPD is replaced with into age resistor 445, remaining and the complete phase of embodiment 5
Together.
Comparative example 3
On the basis of the formula of embodiment 5, neoprene is replaced with into butadiene rubber, remaining is identical with embodiment 5.
Comparative example 4
On the basis of the formula of embodiment 5, butadiene rubber is replaced with into neoprene, remaining is identical with embodiment 5.
Test the mechanical performance of sizing material obtained in each example, heat resistance, cold resistance, resistance to machine oil, oil resistant (IRM 903) property and
Ozone resistance.Test result is as shown in table 1~4.
The mechanical performance of sizing material obtained in each example of table 1
The heat resistance and cold resistance of sizing material obtained in each example of table 2
The resistance to machine oil of sizing material obtained in each example of table 3
The oil resistivity and ozone resistance of sizing material obtained in each example of table 4
From table 1~4：Compared with control group, sizing material obtained in embodiment 1~5 has preferable mechanical performance, heat-resisting
Property, cold resistance, resistance to machine oil, oil resistivity and ozone resistance；Wherein table 1 illustrate the present invention from butadiene rubber, neoprene with
ACM compounding use, and using amino chemically bonded silica and the mixed filler of glass dust so that sizing material
With preferable mechanical performance, table 2, table 3 and table 4 illustrate the present invention from butadiene rubber, neoprene and ACM
Compounding use, with preferable heat resistance, cold resistance and oil resistivity, additionally, can show that the present invention uses age resistor by table 4
445th, the mixture of age resistor IPPD and antioxidant NBC three is used as age resistor, with preferable ozone resistance.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined
May be appreciated other embodiment.
Claims (5)
1. a kind of high strength acrylic acid esters sizing material, it is characterised in that in parts by weight, be made up of following raw material：Acrylate
100 parts of rubber, 20~28 parts of butadiene rubber, 8~14 parts of neoprene, 24~30 parts of high wear-resistant carbon black, semi-reinforcing hydrocarbon black 6~10
Part, 1.2~1.6 parts of butyl stearate, 2.1~2.5 parts of ATBC, 2.0~3.2 parts of amino chemically bonded silica, glass
7~11 parts of glass powder, 445 2.2~2.6 parts of age resistor, 1.0~1.5 parts of age resistor IPPD, 1.4~1.8 parts of antioxidant NBC,
1.5~2.2 parts of zinc oxide, 1.0~1.3 parts of enuatrol, 5.4~6.2 parts of sulphur, 1.8~2.4 parts of accelerator DZ.
2. high strength acrylic acid esters sizing material according to claim 1, it is characterised in that in parts by weight, by following original
Material composition：100 parts of ACM, 22~25 parts of butadiene rubber, 10~13 parts of neoprene, high wear-resistant carbon black 25~28
Part, 8~10 parts of semi-reinforcing hydrocarbon black, 1.4~1.5 parts of butyl stearate, 2.2~2.4 parts of ATBC, amino silane bonding
It is 2.6~3.0 parts of silica gel, 8~10 parts of glass dust, 445 2.4~2.5 parts of age resistor, 1.2~1.4 parts of age resistor IPPD, anti-old
1.5~1.6 parts of agent NBC, 1.8~2.0 parts of zinc oxide, 1.1~1.2 parts of enuatrol, 5.8~6.0 parts of sulphur, accelerator DZ
2.0~2.2 parts.
3. high strength acrylic acid esters sizing material according to claim 2, it is characterised in that in parts by weight, by following original
Material composition：100 parts of ACM, 24 parts of butadiene rubber, 12 parts of neoprene, 26 parts of high wear-resistant carbon black, semi-reinforcing hydrocarbon black 9
Part, 1.4 parts of butyl stearate, 2.3 parts of ATBC, 2.8 parts of amino chemically bonded silica, 9 parts of glass dust, age resistor
445 2.5 parts, 1.3 parts of age resistor IPPD, 1.5 parts of antioxidant NBC, 1.9 parts of zinc oxide, 1.1 parts of enuatrol, 5.9 parts of sulphur,
2.1 parts of accelerator DZ.
4. according to the preparation method of any described high strength acrylic acid esters sizing material of claims 1 to 3, it is characterised in that including
Following steps：
(1) high wear-resistant carbon black, semi-reinforcing hydrocarbon black, glass dust, amino chemically bonded silica are preheated to 140~145 DEG C, by tristearin
Acid butyl ester, ATBC, age resistor 445, age resistor IPPD, antioxidant NBC are preheated to 135~140 DEG C, standby；
(2) ACM, butadiene rubber, neoprene are mixed in proportion, is 380~420W, microwave in microwave power
Frequency obtains first compound to carry out 2~3min of heating using microwave under conditions of 5~7GHz；
(3) raw material then in proportion by preheating in step (1) is poured into the first compound of step (2), is continued in microwave work(
Rate be 350~380W, microwave frequency be 8~10GHz under conditions of carry out 1~2min of heating using microwave, obtain secondary mixed material；
(4) it is 168 in temperature and then toward addition zinc oxide, enuatrol, sulphur, accelerator DZ in the secondary mixed material of step (3)
~172 DEG C, pressure be to carry out 2.0~2.5min of vulcanization under conditions of 20~22MPa, natural cooling is obtained described high intensity
Acrylate sizing material.
5. according to any described high strength acrylic acid esters sizing material of claims 1 to 3 in terms of automobile oil seal seal is prepared
Using.
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| CN201611016296.1A CN106751294A (en) | 2016-11-18 | 2016-11-18 | A kind of high strength acrylic acid esters sizing material and preparation method and application |
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| CN201611016296.1A CN106751294A (en) | 2016-11-18 | 2016-11-18 | A kind of high strength acrylic acid esters sizing material and preparation method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112898646A (en) * | 2019-12-04 | 2021-06-04 | 湖南创安防爆电器有限公司 | Sealing rubber ring for explosion-proof motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102977532A (en) * | 2012-11-27 | 2013-03-20 | 天津鹏翎胶管股份有限公司 | Acrylate rubber composition |
| CN103694610A (en) * | 2013-11-29 | 2014-04-02 | 马鞍山市中澜橡塑制品有限公司 | Rubber sealing pad material with wear resistance and sealing performance and preparation method of material |
| WO2014160251A1 (en) * | 2013-03-25 | 2014-10-02 | 3M Innovative Properties Company | Acrylate rubber sealing material |
-
2016
- 2016-11-18 CN CN201611016296.1A patent/CN106751294A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102977532A (en) * | 2012-11-27 | 2013-03-20 | 天津鹏翎胶管股份有限公司 | Acrylate rubber composition |
| WO2014160251A1 (en) * | 2013-03-25 | 2014-10-02 | 3M Innovative Properties Company | Acrylate rubber sealing material |
| CN103694610A (en) * | 2013-11-29 | 2014-04-02 | 马鞍山市中澜橡塑制品有限公司 | Rubber sealing pad material with wear resistance and sealing performance and preparation method of material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112898646A (en) * | 2019-12-04 | 2021-06-04 | 湖南创安防爆电器有限公司 | Sealing rubber ring for explosion-proof motor |
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Application publication date: 20170531 |