CN103029255A - Preparation methods of ethylene-propylene-terpolymer-molded sponge rubber and special-shaped sponge sheath - Google Patents
Preparation methods of ethylene-propylene-terpolymer-molded sponge rubber and special-shaped sponge sheath Download PDFInfo
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- CN103029255A CN103029255A CN2012105240712A CN201210524071A CN103029255A CN 103029255 A CN103029255 A CN 103029255A CN 2012105240712 A CN2012105240712 A CN 2012105240712A CN 201210524071 A CN201210524071 A CN 201210524071A CN 103029255 A CN103029255 A CN 103029255A
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Abstract
The invention relates to preparation methods of ethylene-propylene-terpolymer-molded sponge rubber and a special-shaped sponge sheath. According to the preparation methods, the roll temperature of an open mill is controlled to be at 70-80 DEG C, and thermal smelting is carried out on ethylene-propylene-terpolymer raw rubber for 5-10 times until rubber materials are all under a uniform transparent state; the roll temperature of the open mill is controlled to be 40-60 DEG C, the thermal smelting is carried out on the smelt ethylene-propylene-terpolymer raw rubber for 10-15 times until the rubber materials are all under the uniform transparent state, and a mixing smelting technology of the open mill is carried out; and sponge rubber strips are longitudinally cut according to the size of a sizing mold by a cutting knife to form crescent sheets, two crescent sheets are respectively put into an upper mold cavity and a lower mold cavity of a special-shaped sizing mold, and the sizing mold is put into a flat-panel vulcanizer for vulcanizing foaming, wherein the vulcanizing temperature is 165-175 DEG C, the vulcanizing time is 3-4 minutes, and the flat-panel pressure is 10-15MPa. For the preparation methods of the ethylene-propylene-terpolymer-molded sponge rubber and the special-shaped sponge sheath, the laboratory investigation is turned into industrial investigation based on the development requirements of automobile industry, the production conditions can be controllable, and the production process is relatively stable.
Description
Technical field
The present invention relates to a kind of preparation method of expanded material, particularly the preparation method of a kind of preparation method of EPDM mold pressing sponge rubber and special-shaped sponge sheath.
Background technology
As everyone knows, sponge rubber is a kind of porous elastomer material, it has the performances such as buffering, compression, sealing and heat-insulating sound-insulating of light weight, excellence, can with it as buffering, liner, heat insulation, sound insulation, vibration-absorptive material, obtain to use widely in the various fields such as household electrical appliances, automobile, building dwelling house.Latex foam products is different from general solid rubber goods, in sulfuration heating process two kinds of main process occurs simultaneously, and the blowing agent decomposition discharges gas and rubber is crosslinked under the vulcanizing agent effect.Because the gas that discharges of blowing agent is dissolved in the sizing material at first, existing gas-phase product forms after gas dissolution reaches capacity, and the sizing material foaming of seething with excitement under the pressure of formation gas is fixed up eyelet by vulcanization crosslinking in this while sizing material.Require curingprocess rate can be adjusted to the drawn expanded power to hole wall that bubbing produces for this reason and be a bit larger tham resistance corresponding to hole wall itself.If the formation excessive velocities of gas phase, because sizing material has little time sulfuration, the one by one bubble that then forms will break, and causes gas to be overflowed from each eyelet diffusion, and blow pressure reduces; Otherwise if mutually formation speed of gas is crossed slow or curingprocess rate is too fast, then sizing material can just be finished the sulfuration typing before forming loose structure, caused goods not foam.
In recent years along with the develop rapidly of auto industry; operating temperature in the automobile engine nacelle becomes more and more higher; not only require the sebific duct heat-resisting quantity of each system match good; mutual frictional impact each other simultaneously; this puts the cellular rubber sheath that coincide with its sebific duct shape with regard to requiring at the position that sebific duct bumps easily; the protection sebific duct plays the effect of buffering, heat insulation, sound insulation, the service life of prolongation sebific duct.
At present, the production of the sponge rubber that the special-shaped sheath of domestic EPDM mold pressing is used adopts microwave continuous vulcanization, salt bath continuous vulcanization can only produce the sponge sheath of straight type just based on experimental study, can not coincide with the sebific duct shape with bent angle.The present invention then is based on the requirement of automobile industry development, has turned to industrialized research by laboratory research, can make working condition controlled, and production process is more stable.The present invention selects ethylene propylene diene rubber, select blowing agent Celogen Az (being called for short AC) and two benzene sulfonyl hydrazide ethers (being called for short OBSH), by the proportioning of various auxiliary agents and the control of process conditions in the adjustment prescription, can prepare satisfactory EPDM mold pressing special-shaped sponge sheath.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of EPDM mold pressing sheath sponge rubber, reach the thus preparation method of the special-shaped sponge sheath of sandwich rubber preparation.This technique is divided into following step: the heat refining of rubber, plasticate, mixing, the foaming sulfidization molding.
The formula of ethylene propylene terpolymer with that the present invention adopts is as follows: component and parts by weight are as follows:
100 parts of ethylene propylene diene rubbers,
60～80 parts of carbon blacks,
30～50 parts of softening agent paraffin oils,
3～5 parts in blowing promotor zinc oxide,
2～4 parts of blowing promotor stearic acid,
0.3～0.5 part of accelerator dibenzothiazyl disulfide,
1.3～1.5 parts of accelerant zinc dibutyl dithiocaarbamates,
0.4～0.8 part of accelerant disulfide tetra methylthiuram,
0.3～0.5 part of promoter tetra-sulfurized pair thiuram,
6.5～7.5 parts of blowing agent Celogen Azs,
2.5～3.5 parts in blowing agent two benzene sulfonyl hydrazide ethers,
0.8～1.2 part in vulcanizing agent sulphur.
The Mooney viscosity ML of above-mentioned rubber EPDM
(1+4)100 ℃=28
Carbon black: semi-reinforcing hydrocarbon black N774
Softening agent: paraffin oil
Blowing promotor: zinc oxide, stearic acid
Promoter: dibenzothiazyl disulfide, zinc dibutyl dithiocarbamate, tetramethylthiuram disulfide, tetra-sulfurized pair thiuram
Blowing agent: Celogen Az, two benzene sulfonyl hydrazide ethers
Vulcanizing agent: sulphur
Preparation method of the present invention is as follows:
1) heat refining
With the temperature control of mill roller at 70 ℃～80 ℃, the EPDM rubber in mill heat refining 5～10 times until sizing material is the transparent and homogeneous shape;
2) plasticate
At 40 ℃～60 ℃, the sizing material that heat refining is good is plasticated 10～15 times until sizing material is the transparent and homogeneous shape in mill with the temperature control of mill roller
3) mixing
1. with the temperature control of mill roller at 50 ℃～70 ℃, roll spacing transfers to 2～3mm, throws in above-mentioned sizing material of plasticating and forms continuous bag roller glue;
2. 1/2nd carbon blacks, blowing promotor, promoter premix are stirred between rear slow adding mill two rollers, left and right sides cutter makes it to disperse;
3. tune up roll spacing to 3～4mm, alternately add softening agent and remaining 1/2nd carbon blacks, when treating that material is sneaked into substantially about cutter, make it to disperse;
4. after the blowing agent premix being stirred, once add between mill two rollers, left and right sides cutter makes it to disperse 5～7 minutes time;
5. adjust roll spacing to 1mm, thin-pass 8～10 times;
6. tune up roll spacing to 2～4mm, smash refining evenly, lower adhesive tape;
Sandwich rubber of the present invention, hardness is low, and oil-filled amount is large, and conventional mixer mixing process can't carry out, and the present invention adopts mill mixing technique.
Sponge rubber prepares the method for sponge sheath, it is characterized in that the size of sponge adhesive tape according to shaper, longitudinally determine the crescent moon matrix with cutting off the feet cutter, get two up and down die cavitys of putting into respectively special-shaped shaper, shaper is put into vulcanizing press carry out sulfur foam, 165 ℃～175 ℃ of curing temperatures, 3～4 minutes time, dull and stereotyped pressure 10MPa～15MPa.
The present invention is based on the Automobile Market research and development, adopt mill mixing technique, can prepare EPDM mold pressing sandwich rubber and special-shaped sponge sheath by the proportioning of various auxiliary agents and the control of process conditions in the adjustment prescription.
The specific embodiment
Embodiment 1
1, by following prescription take by weighing material ((blend unit: parts by weight)):
100 parts of ethylene propylene diene rubbers,
60 parts of carbon blacks,
30 parts of paraffin oils,
3 parts in zinc oxide,
2 parts of stearic acid,
0.3 part of dibenzothiazyl disulfide,
1.3 parts of zinc dibutyl dithiocarbamates,
0.4 part of tetramethylthiuram disulfide,
0.3 part of tetra-sulfurized pair thiuram,
6.5 parts of Celogen Azs,
2.5 parts in two benzene sulfonyl hydrazide ethers,
0.8 part in sulphur.
2, heat refining
70 ℃ of mill roller temperature, roll spacing 1mm, EPDM rubber in mill heat refining 5～10 times until sizing material is the transparent and homogeneous shape;
3, plasticate
40 ℃ of mill roller temperature, roll spacing 1mm, the sizing material that heat refining is good is plasticated 10～15 times until sizing material is the transparent and homogeneous shape in mill
4, mixing
1. with the temperature control of mill roller at 50 ℃, adjust roll spacing to 3mm, throw in above-mentioned sizing material of plasticating and form continuous bag roller glue;
2. 1/2nd carbon blacks, zinc oxide, stearic acid, accelerator dibenzothiazyl disulfide, accelerant zinc dibutyl dithiocaarbamate, accelerant disulfide tetra methylthiuram, promoter tetra-sulfurized pair thiuram premix are stirred between rear slow adding mill two rollers, left and right sides cutter makes it to disperse;
3. adjust roll spacing to 3mm, alternately add paraffin oil and remaining 1/2nd carbon blacks, when treating that material is sneaked into substantially about cutter, make it to disperse;
4. after blowing agent Celogen Az, blowing agent two benzene sulfonyl hydrazide ethers and vulcanizing agent sulphur premix being stirred, once add between mill two rollers, left and right sides cutter makes it to disperse 5 minutes time;
5. adjust roll spacing to 1mm, thin-pass 8 times;
6. adjust roll spacing to 2mm, smash refining evenly, lower adhesive tape, its size (long * wide * thick) is 600mm * 240mm * 3mm;
7. with the size of above-mentioned sponge adhesive tape according to shaper, longitudinally determine the crescent moon matrix with cutting off the feet cutter, get two up and down die cavitys of putting into respectively special-shaped shaper, shaper is put into vulcanizing press carry out sulfur foam, curing temperature
165 ℃, 3 minutes time, dull and stereotyped pressure 10MPa.As follows according to above method gained sponge sheath performance:
Embodiment 2
1, by following prescription take by weighing material ((blend unit: parts by weight)):
100 parts of ethylene propylene diene rubbers,
70 parts of carbon blacks,
40 parts of paraffin oils,
4 parts in zinc oxide,
3 parts of stearic acid,
0.4 part of dibenzothiazyl disulfide,
1.4 parts of zinc dibutyl dithiocarbamates,
0.6 part of tetramethylthiuram disulfide,
0.4 part of tetra-sulfurized pair thiuram,
7 parts of Celogen Azs,
3 parts in two benzene sulfonyl hydrazide ethers,
1 part in sulphur.
2, heat refining
75 ℃ of mill roller temperature, roll spacing 1mm, EPDM rubber in mill heat refining 5～10 times until sizing material is the transparent and homogeneous shape;
3, plasticate
50 ℃ of mill roller temperature, roll spacing 1mm, the sizing material that heat refining is good is plasticated 10～15 times until sizing material is the transparent and homogeneous shape in mill
4, mixing
1. with the temperature control of mill roller at 60 ℃, adjust roll spacing to 2mm, throw in above-mentioned sizing material of plasticating and form continuous bag roller glue;
2. with 1/2nd carbon blacks, zinc oxide, stearic acid, accelerator dibenzothiazyl disulfide, accelerant zinc dibutyl dithiocaarbamate, accelerant disulfide tetra methylthiuram, promoter tetra-sulfurized pair thiuram, premix stirs between rear slow adding mill two rollers, left and right sides cutter makes it to disperse;
3. adjust roll spacing to 4mm, alternately add paraffin oil and remaining 1/2nd carbon blacks, when treating that material is sneaked into substantially about cutter, make it to disperse;
4. after blowing agent Celogen Az, blowing agent two benzene sulfonyl hydrazide ethers and vulcanizing agent sulphur premix being stirred, once add between mill two rollers, left and right sides cutter makes it to disperse 6 minutes time;
5. adjust roll spacing to 1mm, thin-pass 9 times;
6. adjust roll spacing to 3mm, smash refining evenly, lower adhesive tape, its size (long * wide * thick) is 600mm * 240mm * 3mm;
7. with the size of above-mentioned sponge adhesive tape according to shaper, longitudinally determine the crescent moon matrix with cutting off the feet cutter, get two up and down die cavitys of putting into respectively special-shaped shaper, shaper is put into vulcanizing press carry out sulfur foam, 170 ℃ of curing temperatures, 3.5 minutes time, dull and stereotyped pressure 12MPa.As follows according to above method gained sponge sheath performance:
| Sequence number | Test event | Unit | Measured value |
| 1 | Density | g/cm 3 | 0.20 |
| 2 | Hot strength | MPa | 2.0 |
| 3 | Percentage elongation | % | 350 |
Embodiment 3
1, by following prescription take by weighing material ((blend unit: parts by weight)):
100 parts of ethylene propylene diene rubbers,
80 parts of carbon blacks,
50 parts of paraffin oils,
5 parts in zinc oxide,
4 parts of stearic acid,
0.5 part of dibenzothiazyl disulfide,
1.5 parts of zinc dibutyl dithiocarbamates,
0.8 part of tetramethylthiuram disulfide,
0.5 part of tetra-sulfurized pair thiuram,
7.5 parts of Celogen Azs,
3.5 parts in two benzene sulfonyl hydrazide ethers,
1.2 parts in sulphur.
2, heat refining
80 ℃ of mill roller temperature, roll spacing 1mm, EPDM rubber in mill heat refining 5～10 times until sizing material is the transparent and homogeneous shape;
3, plasticate
60 ℃ of mill roller temperature, roll spacing 1mm, the sizing material that heat refining is good is plasticated 10～15 times until sizing material is the transparent and homogeneous shape in mill
4, mixing
1. with the temperature control of mill roller at 70 ℃, adjust roll spacing to 3mm, throw in above-mentioned sizing material of plasticating and form continuous bag roller glue;
2. with 1/2nd carbon blacks, zinc oxide, stearic acid, accelerator dibenzothiazyl disulfide, accelerant zinc dibutyl dithiocaarbamate, accelerant disulfide tetra methylthiuram, promoter tetra-sulfurized pair thiuram, premix stirs between rear slow adding mill two rollers, left and right sides cutter makes it to disperse;
3. adjust roll spacing to 3mm, alternately add paraffin oil and remaining 1/2nd carbon blacks, when treating that material is sneaked into substantially about cutter, make it to disperse;
4. after blowing agent Celogen Az, blowing agent two benzene sulfonyl hydrazide ethers and vulcanizing agent sulphur premix being stirred, once add between mill two rollers, left and right sides cutter makes it to disperse 7 minutes time;
5. adjust roll spacing to 1mm, thin-pass 10 times;
6. adjust roll spacing to 4mm, smash refining evenly, lower adhesive tape, its size (long * wide * thick) is 600mm * 240mm * 3mm;
7. with the size of above-mentioned sponge adhesive tape according to shaper, longitudinally determine the crescent moon matrix with cutting off the feet cutter, get two up and down die cavitys of putting into respectively special-shaped shaper, shaper is put into vulcanizing press carry out sulfur foam, 175 ℃ of curing temperatures, 4 minutes time, dull and stereotyped pressure 15MPa.As follows according to above method gained sponge sheath performance:
| Sequence number | Test event | Unit | Measured value |
| 1 | Density | g/cm 3 | 0.22 |
| 2 | Hot strength | MPa | 2.1 |
| 3 | Percentage elongation | % | 340 |
The composition and engineering condition of pressing above-described embodiment all can prepare satisfactory EPDM mold pressing sandwich rubber and special-shaped sponge sheath.
Claims (3)
1. the preparation method of an EPDM mold pressing sponge rubber is characterized in that step is as follows:
1) heat refining
With the temperature control of mill roller at 70 ℃～80 ℃, the EPDM rubber in mill heat refining 5～10 times until sizing material is the transparent and homogeneous shape;
2) plasticate
At 40 ℃～60 ℃, the sizing material that heat refining is good is plasticated 10～15 times until sizing material is the transparent and homogeneous shape in mill with the temperature control of mill roller
3) mixing
1. with the temperature control of mill roller at 50 ℃～70 ℃, roll spacing transfers to 2～3mm, throws in above-mentioned sizing material of plasticating and forms continuous bag roller glue;
2. 1/2nd carbon blacks, blowing promotor, promoter premix are stirred between rear slow adding mill two rollers, left and right sides cutter makes it to disperse;
3. tune up roll spacing to 3～4mm, alternately add softening agent and remaining 1/2nd carbon blacks, when treating that material is sneaked into substantially about cutter, make it to disperse;
4. after the blowing agent premix being stirred, once add between mill two rollers, left and right sides cutter makes it to disperse 5～7 minutes time;
5. adjust roll spacing to 1mm, thin-pass 8～10 times;
6. tune up roll spacing to 2～4mm, smash refining evenly, lower adhesive tape.
2. the method for claim 1 is characterized in that step 3) adopts mill to carry out mixing.
3. the sponge rubber of employing claim 1 prepares the method for sponge sheath, it is characterized in that the size of sponge adhesive tape according to shaper, longitudinally determine the crescent moon matrix with cutting off the feet cutter, get two up and down die cavitys of putting into respectively special-shaped shaper, shaper is put into vulcanizing press carry out sulfur foam, 165 ℃～175 ℃ of curing temperatures, 3～4 minutes time, dull and stereotyped pressure 10MPa～15MPa.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104194162A (en) * | 2014-08-20 | 2014-12-10 | 太仓荣南密封件科技有限公司 | EPDM (ethylene-propylene-diene monomer) rubber for air conditioners and preparation technique thereof |
| CN104231454A (en) * | 2014-09-23 | 2014-12-24 | 太仓荣南密封件科技有限公司 | EPDM (Ethylene-Propylene-Diene Monomer) white sponge strip for automobile air conditioner and preparation method of EPDM white sponge strip |
| CN104262798A (en) * | 2014-09-23 | 2015-01-07 | 太仓荣南密封件科技有限公司 | Application of EPDM white article sponge to automobile air-conditioner |
| CN104908191A (en) * | 2015-05-11 | 2015-09-16 | 苏州国泰科技发展有限公司 | Production technology of vehicle door sponge rubber sealing ring with high sealability |
| CN109627608A (en) * | 2018-12-27 | 2019-04-16 | 江阴海达橡塑股份有限公司 | A kind of automobile molding injection sponge rubber sealing strip |
| CN111171585A (en) * | 2020-01-16 | 2020-05-19 | 北京龙苑伟业新材料有限公司 | Microporous high-expansion adhesive tape and preparation method thereof |
| CN111875834A (en) * | 2020-06-29 | 2020-11-03 | 桐乡市洲泉振强塑业有限公司 | Foamed rubber anti-collision strip and production process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104194162A (en) * | 2014-08-20 | 2014-12-10 | 太仓荣南密封件科技有限公司 | EPDM (ethylene-propylene-diene monomer) rubber for air conditioners and preparation technique thereof |
| CN104231454A (en) * | 2014-09-23 | 2014-12-24 | 太仓荣南密封件科技有限公司 | EPDM (Ethylene-Propylene-Diene Monomer) white sponge strip for automobile air conditioner and preparation method of EPDM white sponge strip |
| CN104262798A (en) * | 2014-09-23 | 2015-01-07 | 太仓荣南密封件科技有限公司 | Application of EPDM white article sponge to automobile air-conditioner |
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| CN104908191A (en) * | 2015-05-11 | 2015-09-16 | 苏州国泰科技发展有限公司 | Production technology of vehicle door sponge rubber sealing ring with high sealability |
| CN109627608A (en) * | 2018-12-27 | 2019-04-16 | 江阴海达橡塑股份有限公司 | A kind of automobile molding injection sponge rubber sealing strip |
| CN111171585A (en) * | 2020-01-16 | 2020-05-19 | 北京龙苑伟业新材料有限公司 | Microporous high-expansion adhesive tape and preparation method thereof |
| CN111171585B (en) * | 2020-01-16 | 2022-04-26 | 北京龙苑伟业新材料有限公司 | Microporous high-expansion adhesive tape and preparation method thereof |
| CN111875834A (en) * | 2020-06-29 | 2020-11-03 | 桐乡市洲泉振强塑业有限公司 | Foamed rubber anti-collision strip and production process thereof |
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Address after: 300270 No. 1703, Ge Wan Road, Zhong Tang Industrial Zone, Binhai New Area, Tianjin Patentee after: Tianjin Peng Ling group Limited by Share Ltd Address before: 300384 No. 1703, Ge Wan Road, Grand Port, Tianjin Patentee before: Tianjin Pengling Rubber Tube Co., Ltd. |
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