CN103772765A - Nitrile-butadiene rubber NBR gear cover sealing material and preparation method thereof - Google Patents
Nitrile-butadiene rubber NBR gear cover sealing material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a nitrile-butadiene rubber NBR gear cover sealing material which comprises the following raw materials in parts by weight: 60-90 parts of NBR N241, 10-40 parts of NBR N240S, 3-7 parts of zinc oxide, 1-3 parts of a stearic acid, 1-3 parts of RD, 2-4 parts of 4010 NA, 1-3 parts of 6-ethoxy-2-methyl-1,2,4-trimethyl-1,2-dihydroquinoline, 1-3 parts of microcrystalline wax, 1-3 parts of microcrystalline wax OK1987, 5-20 parts of carbon black N-774, 35-55 parts of carbon black N-990, 10-20 parts of a plasticizer TP-90-B, 0.5-1 part of sulfur S-80, 0.5-2 parts of 4',4-DTDM, 0.5-2 parts of tetramethyl thiuram disulfide, and 1-3 parts of N-cyclohexylbenzothiazole-2-sulphenamide. The invention also discloses a preparation method of the nitrile-butadiene rubber NBR gear cover sealing material.
Description
Technical field
The present invention relates to elastomeric material technical field, particularly a kind of paracril NBR gear cap sealing material and preparation method thereof.
Background technology
Along with the development of automotive electronic technology, the application of power-operated window system on automobile is also more and more extensive.It is mainly to utilize positive and negative the transferring of electric motor to drive rocking arm handle revolving gear, thereby controls the lifting of glass for vehicle window, easy to operate.Gear cap is one of extremely important parts in power-operated window system, and its vital role is sealed rotational gear, and anti-sealing, oil and airborne dust etc. enter power driven system, causes power-operated window system to lose efficacy.The radial force at gear cap and revolving gear sealing position must keep stability, requires elastomeric material to have good high and low temperature resistance and weathering resistance.The NBR gear cap using is now mainly external imported product, and production domesticization is because product performance requirement is high, and production efficiency is low can not meet price demand.
Summary of the invention
The present invention proposes a kind of paracril NBR gear cap sealing material and preparation method thereof, described paracril NBR gear cap sealing material has good resistant of high or low temperature and excellent weather resistance, long service life, and production efficiency is high, and cost is low.
A kind of paracril NBR gear cap sealing material that the present invention proposes, its raw material comprises by weight:
In embodiment, the weight part of paracril N241 can be 60,65,69,74,78,83,85,88,90; The weight part of paracril N240S can be 10,12,15,17,22,26,31,35,40; The weight part of zinc oxide can be 3,4,5,6,7; Stearic weight part can be 1,1.3,1.8,2,2.4,2.5,2.7,3; 2,2,4-trimethylammonium-1, the polymeric weight part of 2-dihyaroquinoline can be 1,1.5,1.8,2,2.4,2.7,3; The weight part of N-sec.-propyl-4-aminodiphenylamine can be 2,2.4,2.7,3,3.2,3.5,3.8,4; 6-oxyethyl group-2,2,4-trimethylammonium-1, the weight part of 2-dihyaroquinoline can be 1,1.1,1.5,2,2.3,2.8,3; The weight part of microcrystalline wax can be 1,1.3,1.35,1.6,1.7,2,2.5,3; The weight part of Microcrystalline Wax OK1987 can be 1,1.35,1.5,1.6,2,2.3,2.9,3; The weight part of carbon black N-774 can be 5,8,10,13,15,18,20; The weight part of carbon black N-990 can be 35,40,44,48,50,51,55; The weight part of softening agent TP-90B can be 10,13,15,17,19,20; The weight part of sulphur S-80 can be 0.5,0.6,0.7,0.8,1; 4', the weight part of 4-dithio morpholine can be 0.5,0.8,1,1.3,1.5,1.7,2; The weight part of tetramethyl-thiuram disulfide can be 0.5,1,1.3,1.5,1.8,2; The weight part of N-cyclohexyl-2-[4-morpholinodithio sulphenamide can be 1,1.4,1.5,1.8,2,2.2,2.5,2.8,3.
Preferably, the weight ratio of microcrystalline wax and Microcrystalline Wax OK1987 is 0.8～1.2.
Preferably, the weight ratio of carbon black N-774 and carbon black N-990 is 0.15～0.3.
Preferably, the raw material of described paracril NBR gear cap sealing material comprises by weight:
The preparation method who the invention allows for a kind of above-mentioned paracril NBR gear cap sealing material, comprises the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 20～60 seconds, then add carbon black N-774 and carbon black N-990 banburying to 85～90 ℃ by proportioning, add softening agent TP-90B banburying to 93～97 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 110～120 ℃, can avoid rubber unvulcanizate incipient scorch aging, the slice that turns refining obtains finished composition, wherein after carbon black adds, to add be mainly in order to improve dispersity to softening agent, and preventing that carbon black and softening agent from synchronously adding affects carbon black dispersion.
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 140～175 ℃ of curing temperatures, curing time is 3-7min.
Preferably, in S1, paracril N241, paracril N240S, zinc oxide, stearic acid, 2,2,4-trimethylammonium-1,2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2,2,4-trimethylammonium-1,2-dihyaroquinoline, microcrystalline wax and the mixing time of Microcrystalline Wax OK1987 in Banbury mixer are no less than 30 seconds, so that rubber can mix with auxiliary agent, can not affect because mixing inequality performance.
Preferably, in S1, add sulphur S-80,4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 113～117 ℃.
Preferably, in S1, add in the process of carbon black N-774 and carbon black N-990 banburying to 85～90 ℃, at least carry floating weight 2 times, carrying the bolt time is 10～20 seconds, prevents that the temperature too fast mixing time that brings that raises is not enough and disperse uneven.
Preferably, in S1, add sulphur S-80,4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to the process of 110～125 ℃, at least carry floating weight 2 times, carrying the bolt time is 10～20 seconds, prevents too fast mixing time deficiency and the dispersion inequality brought of temperature rising.
Preferably, in S2, curing temperature is 148～155 ℃, and curing time is 4～5min.
In the present invention, adopt paracril N241 and paracril N240S the use of a certain proportion of different acrylonitrile contents, can improve high and low temperature resistance and the medium-resistance of rubber self; Adopt polyethers softening agent TP-90B can improve the resistance to low temperature of paracril NBR gear cap sealing material and guarantee material stable performance at low temperatures; A certain proportion of carbon black N-774 and carbon black N-990 mix the addition that uses and control both, can guarantee the elasticity of material, increase the resistance to radial force intensity of material, and make the sealing property temporal evolution of product without considerable change, increase the service life; Use the microcrystalline wax of different crystallinity to mix use with Microcrystalline Wax OK1987 can to improve the ozone resistance of material; By above-mentioned sulphur S-80,4', the low temperature high-speed vulcanization system of 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide composition can make the sulfidization molding time of material in preparation process greatly shorten, thereby the production efficiency that effectively improves product, reduces production costs.
In the present invention, the gear cap sealing material of making according to above-mentioned formula and preparation method, can meet the production domesticization of gear cap sealing material, product meets the performance requriementss such as resistance to ozone, resistance to air loss, radial force, eccentric gas leakage test and has excellent high and low temperature resistance, it has the product performance conservation rate after better high-low temperature resistant round-robin test compared with external import exemplar, has realized the production domesticization of gear cap sealing material.
Accompanying drawing explanation
Fig. 1 is preparation technology's schema of a kind of paracril NBR gear cap sealing material of proposing of the present invention.
Embodiment
The present invention proposes a kind of paracril NBR gear cap sealing material, its raw material comprises by weight:
As shown in Figure 1, Fig. 1 is preparation technology's schema of a kind of paracril NBR gear cap sealing material of proposing of the present invention.
In specific implementation process, with reference to Fig. 1, the preparation method of above-mentioned paracril NBR gear cap sealing material comprises the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 20～60 seconds, then add carbon black N-774 and carbon black N-990 banburying to 85～90 ℃ by proportioning, add softening agent TP-90B banburying to 93～97 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 110～120 ℃, the slice that turns refining obtains finished composition,
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 140～175 ℃ of curing temperatures, curing time is 3-7min.
Below by specific embodiment, technical scheme of the present invention is elaborated.
Embodiment 1
A kind of paracril NBR gear cap sealing material, its raw material comprises by weight:
In the present embodiment 1, the preparation method of above-mentioned paracril NBR gear cap sealing material comprises the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 20 seconds, then add carbon black N-774 and carbon black N-990 banburying to 90 ℃ by proportioning, add softening agent TP-90B banburying to 97 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 120 ℃, the slice that turns refining obtains finished composition,
Wherein, add in the overshoot of carbon black and carry floating weight 2 times, carrying the bolt time is 20 seconds; Add sulphur S-80,4', in 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide mixing process, upwards carry bolt 3 times, carrying the bolt time is 10 seconds;
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 140 ℃ of curing temperatures, curing time is 6min.
Embodiment 2
A kind of paracril NBR gear cap sealing material, its raw material comprises by weight:
In the present embodiment 2, the preparation method of above-mentioned paracril NBR gear cap sealing material comprises the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 50 seconds, then add carbon black N-774 and carbon black N-990 banburying to 87 ℃ by proportioning, add softening agent TP-90B banburying to 95 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 115 ℃, the slice that turns refining obtains finished composition,
Wherein, add in the overshoot of carbon black and carry floating weight 4 times, carrying the bolt time is 10 seconds; Add sulphur S-80,4', in 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide mixing process, upwards carry bolt 2 times, carrying the bolt time is 20 seconds;
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 145 ℃ of curing temperatures, curing time is 3min.
Embodiment 3
A kind of paracril NBR gear cap sealing material, its raw material comprises by weight:
In the present embodiment 3, the preparation method of above-mentioned paracril NBR gear cap sealing material comprises the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 60 seconds, then add carbon black N-774 and carbon black N-990 banburying to 85 ℃ by proportioning, add softening agent TP-90B banburying to 93 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 110 ℃, the slice that turns refining obtains finished composition,
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 175 ℃ of curing temperatures, curing time is 7min.
Embodiment 4
A kind of paracril NBR gear cap sealing material, its raw material comprises by weight:
In the present embodiment 4, the preparation method of above-mentioned paracril NBR gear cap sealing material comprises the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 30 seconds, then add carbon black N-774 and carbon black N-990 banburying to 90 ℃ by proportioning, add softening agent TP-90B banburying to 95 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 120 ℃, the slice that turns refining obtains finished composition,
Wherein, add in the overshoot of carbon black and carry floating weight 3 times, carrying the bolt time is 15 seconds; Add sulphur S-80,4', in 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide mixing process, upwards carry bolt 3 times, carrying the bolt time is 15 seconds;
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 150 ℃ of curing temperatures, curing time is 5min.
Paracril NBR gear cap sealing material described in above-described embodiment 1-4 is carried out to performance test.
Initial physical property: by the NBR extrusion forming sulfuration of filling a prescription, make the standard test piece of 150mm*150mm*2mm, die-cut DIN2 dumbbell from this test piece, uses this dumbbell according to DIN53504-2 test tensile strength, tensile yield; According to ISO2781 standard, standard test piece is tested the density of test material; According to DIN53505 standard, the shore a hardness of material is detected and ISO48 standard detects the IRHD M hardness of material.
Press and become: by fill a prescription extrusion forming sulfuration of NBR, make the standard test specimen of 13mm*6.3mm, test according to ISO815-B.
Heat-resisting air aging and media-resistant: use the standard test piece of 150mm*150mm*2m, require die-cut sample according to test method, in hot air aging case, carry out hot air aging and media-resistant test.
After off-test, by standard test methods, elastomeric material is carried out to hardness, tensile strength at yield, tensile yield, volume detects.
Result is as follows:
(1) basic materialization performance test
According to the testing standard of DIN53505, ISO48, DIN53504-2, ISO2781, ISO815-B, DIN53508, ISO1817, DIN53545 and DIN53509, the hardness to product, tensile strength at yield, tensile yield, density, pressure become respectively, anti-aging, media-resistant, low temperature resistant and ozone resistance test, and result is as shown in table 1:
(2) pressure leakage sealing test
It is under 25 ℃ of conditions that product is put into fc-specific test FC fixture temperature, assembling after ventilation press 50mBar, pour water at product surface, 5 seconds afterwards inspection whether have bubble to overflow.
Test-results: without bubble, air tight.
(3) radial force test
Product is regulated to 16h at ambient temperature, be then inserted on the mechanics sensor of specified diameter, setting the test duration is 10 seconds, and record radial force value, wherein, radial force sensor diameter is 23.8mm, touchstone is DIN3761-9, and test set is NTS-4120-AAW radial force tester.
Test-results: products radial power meets standard-required.
(4) the eccentric gas leakage test of product
By Product Assembly, to motor assembly, the design different eccentricitys of transmission shaft (0.23mm, 0.35mm, 0.4mm) are put into product under water, start electric machine rotation motor, whether observe has bubble to overflow, wherein test temperature is room temperature, and test period is 10S, and test pressure is 50mBar.
Test-results: move motor when three kinds of different eccentricitys, all without gas leak phenomenon.
(5) high-low temperature resistant test
Product is carried out to high cold cycle 100 times after (total duration 600h), each performance and the conservation rate of test products.Minimum temperature is-40 ℃, and top temperature is 100 ℃, and the highest, the minimum temperature residence time is 60 minutes, and regulating temperature-time is 120 minutes.
Wherein, shrink range=(drive shaft diameter-gear cap sealing position internal diameter)/2; Shrink range after shrink range-test before change=test of shrink range=(test drive axle diameter-test nipper wheel cap sealing position internal diameter-test rear drive shaft diameter+test backgear lid sealing position internal diameter)/2; Shrink range changes that the high and low temperature resistance of explanation product is poorer greatly.
Test-results: after high low temperature weathering test, the lip shrink range of product and eccentric air leakage test result all meet or exceed external import parts.
The gear cap sealing material of making according to above-mentioned formula and preparation method, can meet the production domesticization of gear cap sealing material, product meets the performance requriementss such as resistance to ozone, resistance to air loss, radial force, eccentric gas leakage test and has excellent high and low temperature resistance, it has the product performance conservation rate after better high-low temperature resistant round-robin test compared with external import exemplar, has realized the production domesticization of gear cap sealing material.
In embodiment 1-4, adopt paracril N241 and paracril N240S the use of a certain proportion of different acrylonitrile contents, can improve high and low temperature resistance and the medium-resistance of rubber self; Adopt polyethers softening agent TP-90B can improve the resistance to low temperature of paracril NBR gear cap sealing material and guarantee material stable performance at low temperatures; A certain proportion of carbon black N-774 and carbon black N-990 mix the addition that uses and control both, can guarantee the elasticity of material, increase the resistance to radial force intensity of material, and make the sealing property temporal evolution of product without considerable change, increase the service life; Use the microcrystalline wax of different crystallinity to mix use with Microcrystalline Wax OK1987 can to improve the ozone resistance of material; By above-mentioned sulphur S-80,4', the low temperature high-speed vulcanization system of 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide composition can make the sulfidization molding time of material in preparation process greatly shorten, thereby the production efficiency that effectively improves product, reduces production costs.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (10)
1. a paracril NBR gear cap sealing material, is characterized in that, its raw material comprises by weight:
2. paracril NBR gear cap sealing material according to claim 1, is characterized in that, the weight ratio of microcrystalline wax and Microcrystalline Wax OK1987 is 0.8～1.2.
3. paracril NBR gear cap sealing material according to claim 1, is characterized in that, the weight ratio of carbon black N-774 and carbon black N-990 is 0.15～0.3.
4. according to the paracril NBR gear cap sealing material described in any one in claim 1～3, it is characterized in that, its raw material comprises by weight:
5. according to a preparation method for the paracril NBR gear cap sealing material described in any one in claim 1～4, it is characterized in that, comprise the steps:
S1, press proportioning by paracril N241, paracril N240S, zinc oxide, stearic acid, 2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2, 2, 4-trimethylammonium-1, 2-dihyaroquinoline, microcrystalline wax and Microcrystalline Wax OK1987 add in Banbury mixer mixing 20～60 seconds, then add carbon black N-774 and carbon black N-990 banburying to 85～90 ℃ by proportioning, add softening agent TP-90B banburying to 93～97 ℃, add sulphur S-80, 4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 110～120 ℃, the slice that turns refining obtains finished composition,
S2, the finished composition moulding that S1 is obtained, sulfuration obtains paracril NBR gear cap sealing material, wherein 140～175 ℃ of curing temperatures, curing time is 3-7min.
6. the preparation method of paracril NBR gear cap sealing material according to claim 5, it is characterized in that, in S1, paracril N241, paracril N240S, zinc oxide, stearic acid, 2,2,4-trimethylammonium-1,2-dihyaroquinoline polymer, N-sec.-propyl-4-aminodiphenylamine, 6-oxyethyl group-2,2,4-trimethylammonium-1,2-dihyaroquinoline, microcrystalline wax and the mixing time of Microcrystalline Wax OK1987 in Banbury mixer are no less than 30 seconds.
7. the preparation method of paracril NBR gear cap sealing material according to claim 5, it is characterized in that, in S1, add sulphur S-80,4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to 113～117 ℃.
8. the preparation method of paracril NBR gear cap sealing material according to claim 5, is characterized in that, in S1, adds in the process of carbon black N-774 and carbon black N-990 banburying to 85～90 ℃, at least carries floating weight 2 times, and carrying the bolt time is 10～20 seconds.
9. the preparation method of paracril NBR gear cap sealing material according to claim 5, it is characterized in that, in S1, add sulphur S-80,4', 4-dithio morpholine, tetramethyl-thiuram disulfide and N-cyclohexyl-2-[4-morpholinodithio sulphenamide are mixing to the process of 110～125 ℃, at least carry floating weight 2 times, carrying the bolt time is 10～20 seconds.
10. the preparation method of paracril NBR gear cap sealing material according to claim 5, is characterized in that, in S2, curing temperature is 148～155 ℃, and curing time is 4～5min.
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| CN105061840A (en) * | 2015-09-10 | 2015-11-18 | 宋晓梅 | Nitrile-butadiene rubber sealing material and preparation method thereof |
| CN105670053A (en) * | 2016-01-28 | 2016-06-15 | 安徽中鼎密封件股份有限公司 | Seal ring for oil filter |
| CN109134975A (en) * | 2018-09-20 | 2019-01-04 | 裴清馨 | Low temperature resistant NBR rubber of resistance to ozone of one kind and preparation method thereof |
| CN109268583A (en) * | 2018-10-22 | 2019-01-25 | 天津鹏翎集团股份有限公司 | A kind of grain catcher system pressure difference sensor pipeline and preparation method thereof |
| CN111574758A (en) * | 2020-06-01 | 2020-08-25 | 海城市裕丰科技有限公司 | High-temperature-resistant and corrosion-resistant rubber sealing gasket and preparation method thereof |
| CN113881118A (en) * | 2021-11-25 | 2022-01-04 | 南阳天一密封股份有限公司 | Low-compression permanent deformation NBR (nitrile-butadiene rubber) material and preparation process thereof |
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