CN101724172A - Industrial production method for ethylene propylene diene rubber molded sealed cell sponge rubber - Google Patents
Industrial production method for ethylene propylene diene rubber molded sealed cell sponge rubber Download PDFInfo
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- CN101724172A CN101724172A CN200910232680A CN200910232680A CN101724172A CN 101724172 A CN101724172 A CN 101724172A CN 200910232680 A CN200910232680 A CN 200910232680A CN 200910232680 A CN200910232680 A CN 200910232680A CN 101724172 A CN101724172 A CN 101724172A
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Abstract
The invention discloses an industrial production method for ethylene propylene diene rubber molded sealed cell sponge rubber and, relates to an industrial preparation method for a foaming material with a high foaming ratio. The method comprises the following steps of performing plastication, mixing, refining, and foaming and vulcanization molding on raw rubber, and is characterized in that carbon black, naphthenic oil, a blowing promoter, a vulcanization accelerator and an anti-aging agent are added in the mixing process to perform the mixing; a foaming agent Ac and a vulcanizing agent are added in the refining process to perform the refining; and the vulcanization conditions in the foaming and vulcanization molding process are that: the pressure is 15 to 20 MPa; the temperature is 160 to 180 DEG C; and the vulcanizing time is 3,000 to 3,500 seconds. The industrial production method is researched and developed based on market demands to turn laboratory researches to industrialized researches, ensure that the production condition can be controllable and the production process is stable. The industrial production method selects homemade rubber masses, selects the foaming agent Ac to replace the foaming agent H, and prepares an EPDM molded sponge rubber product in accordance with the requirements on the industrial production by adjusting the mixture ratio of various auxiliary agents in a formula and controlling process conditions.
Description
Technical field
The present invention relates to a kind of industrial production process of high foamability foam material.In particular, the present invention relates to the industrial process of terpolymer EP rubber (EPDM) mold pressing sealed cell sponge rubber.
Background technology
As everyone knows, spongy rubber be a kind of be the matrix material of filler with gas, with the rubber phase ratio, it has many valuable performances, as light weight, specific tenacity height, to absorb the strong and heat-insulating sound-insulating of shock load ability effective etc.Therefore, in industries such as automobile, electronics, chemical industry and machinery, be extensive use of.
Rubber sponge is a kind of porous elastomer material, is commonly called as porous rubber, spongy rubber, mipor rubber or mesh rubber, is the general name with various rubber of cell structure.According to the difference of cell structure, can be divided into three kinds of closed pore (not connected between eyelet and the eyelet), perforate (eyelet and eyelet are not separated by hole wall each other fully, have connectedness to a certain degree) and mix aperture (having two kinds of structures of perforate and closed pore concurrently).Rubber sponge singularity structural with it can produce various special effects, as: reduce the density weight reduction; Elasticity and flexibility improve buffering effect; Increase thermal insulation; Improve sound insulation, acoustically effective.Latex foam products is widely used in aspects such as sealing, damping, heat insulation, sound insulation printing and dyeing and even ion-exchange.That its shape has is tabular, strip, roller, liner, packing ring etc., and specification is various, and is different.And different working conditionss requires to have different cell structure and aperture size.
Rubber sponge is different from general solid rubber goods, and two kinds of main processes take place in sulfuration heat-processed simultaneously: the whipping agent decomposition discharges gas and rubber is crosslinked under the vulcanizing agent effect.Because the gas that discharges of whipping agent is dissolved in the sizing material at first, after reaching capacity, gas dissolving promptly have gas-phase product to form, and the sizing material foaming of seething with excitement under the pressure of formation gas is fixed up cell structure by vulcanization crosslinking in this while sizing material.For this reason, requiring vulcanization rate to be adjusted to is that the drawn expanded power to hole wall that bubbing produces is a bit larger tham the corresponding resistance of hole wall itself.If the formation excessive velocities of gas phase, because sizing material has little time sulfuration, then the bubble one by one of Xing Chenging will break, and causes gas to be overflowed from each eyelet diffusion, and blow(ing) pressure reduces; Otherwise if gas formation speed is mutually crossed slow or vulcanization rate is too fast, then can just to finish sulfuration before forming vesicular structure qualitative for sizing material.
At present, domestic research to the EPDM gelatin sponge is that the sizing material of selecting for use mostly is import based on experimental study, because the blowing agent H thermal value is bigger than foaming agent ac, and experimentation more options blowing agent H.But this experiment condition can only be adapted to the foam material of small dimension in the laboratory, can not meet the demands for industrialized production.Simultaneously, rubber is that the incipient scorch phenomenon easily takes place for the poor conductor of heat so the blowing agent H thermal value is big.The present invention then is based on market requirement research and development, makes research purpose turn to industrialized research from laboratory study, can make working condition controlled, and production process is more stable.The present invention selects homemade sizing material for use, selects for use foaming agent ac to substitute blowing agent H, can prepare the EPDM mold pressing gelatin sponge goods that meet the suitability for industrialized production requirement by proportioning and the control of process condition of adjusting various auxiliary agents in the prescription.
Summary of the invention
The industrial process that the purpose of this invention is to provide a kind of EPDM mold pressing sealed cell sponge rubber.This technology is divided into following step: the plasticating of rubber, mixing, refining, foaming sulfidization molding.
The technical solution used in the present invention comprises following content:
One, material is selected and proportioning (calculating with parts by weight)
Rubber: EPDM:100
Whipping agent: Ac 0.1～0.16
Frothing aid: zinc oxide ZnO and stearic acid HSt, wherein zinc oxide is 0.02～0.05; Stearic acid is 0.008～0.01
Vulcanizing agent: S 0.1～0.16
Vulcanization accelerator: short D, short M, short BZ and short TRA
Wherein short D is 0.001～0.003; Short M is 0.001～0.003; Short BZ is 0.001～0.005; Short TRA is 0.002～0.006.
Anti-aging agent: RD and 4020, parts by weight all are 0.001
Tenderizer: naphthenic oil 40～60
Weighting agent: carbon black (SRF N550) 50
The mooney viscosity ML of above-mentioned rubber EPDM
(1+4) 100 ℃=46.
Two, preparation process:
1) plasticates
The mill temperature is controlled at below 50 ℃, and the EPDM rubber 2-3min that plasticates in mill is transparence until sizing material;
2) mixing (CMB)
The sizing material of plasticating is put into Banbury mixer, and mixing carbon black, naphthenic oil, frothing aid, vulcanization accelerator and the anti-aging agent of adding during to 80～100 ℃ continues the mixing binder removal during to 100～120 ℃ of temperature of pressurization;
3) refining (FMB)
Banbury mixer is preheated to 60～70 ℃, the sizing material that mixes packed into, and the pressurization banburying adds foaming agent ac and vulcanizing agent after 60～90 seconds in the Banbury mixer, empty the making a call to of pressure cover semi-closure depressed the upward pressure lid in 1 minute fully, and banburying is lifted pressure cover by sizing material binder removal after banburying chamber stands up 4 times after 2 minutes;
4) foaming sulfidization molding
The vulcanizer temperature is transferred to 160～180 ℃, pressure transfers to 15～20MPa, the sizing material that refining is good is to open refining earlier once under 0.5 situation at two roller scales, the roll spacing adjustment will be 0 then, play the triangle bag 4～5 times, roll spacing is adjusted to 2.5 scale slices, and according to delivering to the press sulfur foam behind the mould size cut-parts shape glue, foamed time is 3000～3500s.
The present invention is based on market requirement research and development, makes research purpose turn to industrialized research from laboratory study, can make working condition controlled, and production process is more stable.The present invention selects homemade sizing material for use, selects for use foaming agent ac to substitute blowing agent H, can prepare the EPDM mold pressing gelatin sponge goods that meet the suitability for industrialized production requirement by proportioning and the control of process condition of adjusting various auxiliary agents in the prescription.
Embodiment
Embodiment 1:
Take by weighing material by following prescription: EPDM:500g, carbon black: 250g, naphthenic oil: 250g, short BZ:0.6g, short D:0.5g, short TRA:0.6g, short M:0.5g, stearic acid: 8g, zinc oxide: 15g, Ac:30g, S:0.8g
Plasticate: control mill two roll temperatures maintain below 50 ℃, and rubber is that refining is earlier moulded 2 times under 1 the situation at the roll spacing scale, then roll spacing is adjusted to 0 scale, plays the triangle bag 4～6 times, to the sizing material shape that is translucent.
Mixing: as qualified EPDM mucilage binding to be moulded in refining gone into the banburying of pressurizeing in the Banbury mixer, when rising to 80 ℃, temperature rises pressure cover, add carbon black, naphthenic oil and frothing aid, vulcanization accelerator, anti-aging agent, after pressure cover semi-closure sky is beaten about 1 minute, depress the upward pressure lid fully, binder removal when temperature rises to 120 ℃, and deliver to two rollers and open refining.The sizing material that mixes is to open refining earlier once under 0.5 situation at two roller scales; Then roll spacing is adjusted into 0, plays the triangle bag 4～5 times; Roll spacing is adjusted to 2.5 scale slices, parks after the slaking in 24 hours stand-by.
Refining: Banbury mixer is preheated to 65 ℃, qualified CMB mucilage binding is moulded in refining gone into the banburying 70 seconds of pressurizeing in the Banbury mixer, rise pressure cover and add foaming agent ac and vulcanizing agent, after pressure cover semi-closure sky is beaten about 1 minute, depress the upward pressure lid fully, banburying is lifted pressure cover by sizing material binder removal after banburying chamber stands up 4 times after 2 minutes, and delivers to two rollers and open refining.
The foaming sulfidization molding: the vulcanizer temperature transfers to 160 ℃, pressure transfers to 15MPa, is to open refining earlier once under 0.5 situation with the sizing material that mixes at two roller scales, then roll spacing is adjusted into 0 dozen of triangle bag 4～5 times, roll spacing is adjusted to 2.5 scale slices, according to delivering to the press sulfur foam behind the mould size cut-parts shape glue, foamed time is 3000s.
Performance according to above prescription resulting product is as follows:
Embodiment 2:
Take by weighing material by following prescription: EPDM:500g, carbon black: 250g, naphthenic oil: 100g, short BZ:0.6g, short D:0.5g, short TRA:0.6g, short M:0.5g, stearic acid: 4g, zinc oxide: 8g, Ac:16g, S:13g
Plasticate: control mill two roll temperatures are that refining is earlier moulded 2 times under 1 the situation at the roll spacing scale with rubber, then roll spacing are adjusted to 0 scale, play the triangle bag 4～6 times, to the sizing material shape that is translucent.
Mixing: as qualified EPDM mucilage binding to be moulded in refining gone into the banburying of pressurizeing in the Banbury mixer, when rising to 85 ℃, temperature rises pressure cover, add carbon black, naphthenic oil and frothing aid, vulcanization accelerator, anti-aging agent, after pressure cover semi-closure sky is beaten about 1 minute, depress the upward pressure lid fully, binder removal when temperature rises to 118 ℃, and deliver to two rollers and open refining.The sizing material that mixes is to open refining earlier once under 0.5 situation at two roller scales; Then roll spacing is adjusted into 0, plays the triangle bag 4～5 times; Roll spacing is adjusted to 2.5 scale slices, parks after the slaking in 24 hours stand-by.
Refining: Banbury mixer is preheated to 65 ℃, qualified CMB mucilage binding is moulded in refining gone into the banburying 70 seconds of pressurizeing in the Banbury mixer, rise pressure cover and add foaming agent ac and vulcanizing agent.After pressure cover semi-closure sky is beaten about 1 minute, depress the upward pressure lid fully, banburying is lifted pressure cover by sizing material binder removal after banburying chamber stands up 4 times after 2 minutes, and delivers to two rollers and open refining.
The foaming sulfidization molding: the vulcanizer temperature is transferred to 165 ℃, and pressure transfers to 15MPa, and the sizing material that mixes is to open refining earlier once under 0.5 situation at two roller scales; The roll spacing adjustment will be 0 then, play the triangle bag 4～5 times; Roll spacing is adjusted to 2.5 scale slices, and according to delivering to the press sulfur foam behind the mould size cut-parts shape glue, foamed time is 3300s.As follows according to above prescription resulting product performance:
Embodiment 3:
Take by weighing material by following prescription: EPDM:500g, carbon black: 250g, naphthenic oil: 100, short BZ:0.6g, short D:0.5g, short TRA:0.6g, short M:0.5g, stearic acid: 8g, zinc oxide: 8g, Ac:16g, S:5g
Plasticate: control mill two roll temperatures are that refining is earlier moulded 2 times under 1 the situation at the roll spacing scale with rubber, then roll spacing are adjusted to 0 scale, play the triangle bag 4～6 times, to the sizing material shape that is translucent.
Mixing: as qualified EPDM mucilage binding to be moulded in refining gone into the banburying of pressurizeing in the Banbury mixer, rise pressure cover when temperature rises to 90 ℃, add carbon black, naphthenic oil and frothing aid, vulcanization accelerator, anti-aging agent.After pressure cover semi-closure sky is beaten about 1 minute, depress the upward pressure lid fully, binder removal when temperature rises to 110 ℃, and deliver to two rollers and open refining.The sizing material that mixes is to open refining earlier once under 0.5 situation at two roller scales; Then roll spacing is adjusted into 0, plays the triangle bag 4～5 times; Roll spacing is adjusted to 2.5 scale slices, parks after the slaking in 24 hours stand-by.
Refining: Banbury mixer is preheated to 65 ℃, qualified CMB mucilage binding is moulded in refining gone into the banburying 70 seconds of pressurizeing in the Banbury mixer, rise pressure cover and add the second bag auxiliary agent.After pressure cover semi-closure sky is beaten about 1 minute, depress the upward pressure lid fully, banburying is lifted pressure cover by sizing material binder removal after banburying chamber stands up 4 times after 2 minutes, and delivers to two rollers and open refining.
The foaming sulfidization molding: the vulcanizer temperature transfers to 165 ℃, and pressure transfers to 20MPa, is to open refining earlier once under 0.5 situation with the sizing material that mixes at two roller scales; Then roll spacing is adjusted into 0, plays the triangle bag 4～5 times; Roll spacing is adjusted to 2.5 scale slices, and according to delivering to the press sulfur foam behind the mould size cut-parts shape glue, foamed time is 3400s.
As follows according to the capable performance of above prescription resulting product:
Claims (6)
1. the industrial process of a terpolymer EP rubber (EPDM) mold pressing sealed cell sponge rubber, comprise the plasticating of rubber, mixing, refining, foaming sulfidization molding, it is characterized in that: add carbon black, naphthenic oil, frothing aid, vulcanization accelerator and anti-aging agent when mixing and carry out mixing; Adding foaming agent ac and vulcanizing agent carry out refining during refining; The cure conditions of foaming sulfidization molding is: pressure 15～20MPa, 160～180 ℃ of temperature, curing time 3000～3500s;
The material of above-mentioned adding calculates with parts by weight, is respectively:
Rubber: EPDM:100;
Whipping agent: Ac 0.1～0.16;
Frothing aid: zinc oxide and stearic acid, wherein zinc oxide is 0.02～0.05; Stearic acid is 0.008～0.01;
Vulcanizing agent: S 0.1～0.16;
Vulcanization accelerator: short D, short M, short BZ and short TRA,
Wherein short D is 0.001～0.003; Short M is 0.001～0.003; Short BZ is 0.001～0.005; Short TRA is 0.002～0.006;
Anti-aging agent: RD and 4020, parts by weight all are 0.001;
Tenderizer: naphthenic oil 40～60;
Weighting agent: carbon black (SRF N550) 50.
2. the industrial process of above-mentioned a kind of ethylene propylene diene rubber molded sealed cell sponge rubber, it is characterized in that: the concrete technology of plasticating of rubber is: the mill temperature is controlled at below 50 ℃, and the EPDM rubber 2-3min that plasticates in mill is transparence until sizing material.
3. the industrial process of above-mentioned a kind of ethylene propylene diene rubber molded sealed cell sponge rubber, it is characterized in that: mixing concrete technology is: the sizing material that will plasticate is put into Banbury mixer, mixing carbon black, naphthenic oil, frothing aid, vulcanization accelerator and the anti-aging agent of adding during to 80～100 ℃ continues the mixing binder removal during to 100～120 ℃ of temperature of pressurization.
4. the industrial process of above-mentioned a kind of ethylene propylene diene rubber molded sealed cell sponge rubber, it is characterized in that: the concrete technology of purified is: Banbury mixer is preheated to 60～70 ℃, the sizing material that mixes packed into, and the pressurization banburying adds foaming agent ac and vulcanizing agent after 60～90 seconds in the Banbury mixer, empty the making a call to of pressure cover semi-closure depressed the upward pressure lid fully after 1 minute, banburying is lifted pressure cover by sizing material binder removal after banburying chamber stands up 4 times after 2 minutes.
5. the industrial process of above-mentioned a kind of ethylene propylene diene rubber molded sealed cell sponge rubber, it is characterized in that: the concrete technology of foaming sulfidization molding is: the vulcanizer temperature is transferred to 165 ℃, pressure transfers to 15MPa, the sizing material that refining is good is to open refining earlier once under 0.5 situation at two roller scales, the roll spacing adjustment will be 0 then, play the triangle bag 4～5 times, and roll spacing is adjusted to 2.5 scale slices, according to delivering to the press sulfur foam behind the mould size cut-parts shape glue, foamed time is 3300s.
6. the industrial process of above-mentioned a kind of ethylene propylene diene rubber molded sealed cell sponge rubber is characterized in that: the mooney viscosity ML of rubber EPDM
(1+4) 100 ℃=46.
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