CN103408845B - A kind of high foamability EPDM foamed material and foam forming method thereof - Google Patents
A kind of high foamability EPDM foamed material and foam forming method thereof Download PDFInfo
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Abstract
The present invention relates to ethylene propylene diene rubber, relate in particular to a kind of high foamability ethylene propylene diene rubber (EPDM) foamed material and foam forming method thereof. By the proportioning of each raw material, EPDM base-material is plasticated in mill, plasticate in process, in base-material, add auxiliary agent, after auxiliary agent mixes with base-material, compound tablet is taken off, flatten while hot; By after the preformed of compound tablet, compound tablet is placed in mould, foaming is processed, and after having foamed, after material to be mixed is cooling, mold removal, obtains expanded material. The invention has the beneficial effects as follows: the EPDM frostproof froth n multiplying power of preparing according to formula of the present invention and technique is higher, exceed 700% of routine, make expansion ratio be up to 870%, foam density and mechanical property are adjustable, and the sample cost using does not increase, cost performance is high.
Description
Technical field
The present invention relates to ethylene propylene diene rubber, relate in particular to a kind of high foamability ethylene propylene diene rubber (EPDM) foam materialMaterial and foam forming method thereof.
Background technology
Ethylene propylene diene rubber (EPDM) is the rubber being formed by ethene, propylene and the 3rd a small amount of monomer copolymerization, itOn main chain, formed by chemically stable saturated hydrocarbons, just in side chain, contain unsaturated double-bond, nonpolarity substituting group in molecule,Molecule inner injection can be low, and it is flexible that strand keeps in wider temperature range; Thereby there is excellent chemical stability, ageing-resistantProperty, chemical proofing, electrical insulating property, impact elasticity and cryogenic property, and hot water resistance can wait; Ethylene propylene diene rubber(EPDM) foamed material has the performances such as excellent buffering, sealing, heat insulation, sound insulation, can be applicable to building, communications and transportation, packagingIn field; Current industrial EPDM frostproof froth n multiplying power is generally up to 700%, prepares than prior art the present inventionThe expansion ratio of EPDM foamed material is higher.
Summary of the invention
Technical problem to be solved by this invention is:
Industrial EPDM frostproof froth n multiplying power is generally up to 700%, and EPDM frostproof froth n multiplying power prepared by the present invention moreHeight, the highlyest can reach 870%.
For solving this technical problem, the technical solution used in the present invention is:
The invention provides a kind of high foamability EPDM expanded material, its raw material composition, count by weight:
EPDM100 part;
Crosslinking agent 0.5-1 part;
Ac blowing agent 4-10 part;
Zinc oxide 1-5 part;
Stearic acid 0.5-1 part.
Foamed time 5-15min, blow pressure: 0-10MPa, blowing temperature: 150-180 DEG C.
Optimum formula and technique EPDM100, AC, 6; Crosslinking agent 0.5, zinc oxide 2, stearic acid 1, blowing temperature 170DEG C, pressure 5MPa, foamed time 12min.
Wherein, selected EPDM Mooney viscosity 42, iodine number 12, ethylene contents 52%.
As preferably: crosslinking agent is selected from cumyl peroxide DCP or benzoyl peroxide BPO.
The present invention also provides a kind of preparation method of above-mentioned EPDM expanded material, and concrete operations are:
(1) by the proportioning of each raw material, EPDM base-material is plasticated in mill, plasticate in process, in base-material, addEnter auxiliary agent, after auxiliary agent mixes with base-material, compound tablet is taken off, flatten while hot.
As preferably: plasticate in process, the roller temperature of two roller mills is made as within the scope of 45-60 DEG C.
To the auxiliary agent adding in base-material, just refer to after adding crosslinking agent, zinc oxide, stearic acid simultaneously and add again Ac foamingAgent, in mixed process, plays triangle bag 5-7 time, until blend composition mixes.
Two roller mills are in the time plasticating, and roll spacing is made as 1mm, and when blanking, roll spacing tunes up to 3mm.
(2) by after the compound tablet preformed in step (1), compound tablet is placed in mould, foaming is processed, and sends outAfter finishing into, after material to be mixed is cooling, mold removal, obtains expanded material.
As preferably: preformed is operating as, compound tablet in 70 DEG C framed, preformed under 5MPa pressure10min，
At this temperature, HDPE/LDPE blend composition can not foam again in melting.
As preferably: foaming is treated to, and compound tablet is in electric heating constant-temperature blowing drying box, in 160～180 DEG C of temperatureLower foaming 5-10min.
As preferably: foaming is treated to, compound tablet is in vulcanizing press, in 160～180 DEG C of temperature and pressure 1Under～10MPa, foaming 10-15min.
When this temperature range can ensure the foaming of EPDM material, melt strength is better, foaming process and material cross-linking process energyEnough couplings, pressure limit and foamed time, within the scope of this, value is the most reasonable, and pressure improves again, for foaming material performanceImpact is little, waste power; Time increases again, and little for foaming material performance impact, the increase time is reduced operating efficiency, waveTake energy.
The invention has the beneficial effects as follows: the EPDM frostproof froth n multiplying power of preparing according to formula of the present invention and technique is higher, superCross 700% of routine, make expansion ratio be up to 870%, foam density and mechanical property are adjustable, and the sample cost using alsoDo not increase, cost performance is high.
Brief description of the drawings
Fig. 1 is foam process flow chart of the present invention;
Fig. 2 is the blending foaming material of preparation in embodiment 1, the electron-microscope scanning figure of foam after liquid nitrogen frozen brittle failure（SEM）；
Fig. 3 is the blending foaming material of preparation in embodiment 2, the electron-microscope scanning figure of foam after liquid nitrogen frozen brittle failure（SEM）；
Fig. 4 is the blending foaming material of preparation in embodiment 3, the electron-microscope scanning figure of foam after liquid nitrogen frozen brittle failure（SEM）。
Detailed description of the invention
In following examples, the umber relating to is weight portion. The raw material using and the concrete condition of equipment, as table 10With shown in table 11:
Table 10 primary raw material
Table 11 capital equipment
Embodiment 1:
Foaming formulation is: EPDM100 part, and 0.5 part of benzoyl peroxide (BPO), 6 parts of Ac blowing agents, 3 parts, zinc oxide is hard1 part of resin acid.
Operation:
(1) EPDM base-material is plasticated in mill, roller temperature is 60 DEG C, adds other auxiliary agent, finally adds foamingAgent, plays triangle bag 5 times, until blend composition mixes, tablet is taken off, and flattens while hot;
(2) by the tablet in step (1) framed middle through vulcanizing press preformed, pressure 5MPa, temperature 70 C, pre-Moulding 10min;
(3) then the tablet of precompressed is placed in mould and is foamed, under 160 DEG C of blowing temperatures and pressure 5MPa, foaming10min. After having foamed, after expanded material is cooling, from mould, take off.
After testing: blending foaming material apparent density is 0.139g.cm-3, tearing strength is 3.46N/mm, hot strengthFor 0.42MPa, elongation at break 434%, your the A type hardness tester 4.2 that continues, expansion ratio 820%.
Density is pressed GB/T6342) 1995 tests; Tearing strength is pressed GB/T529) in 1999, without scarfing angle tear strengthStandard, tests; Hot strength is pressed GB/T528) 1998 tests.
Expanded material is after liquid nitrogen frozen brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 2, is found out abscess by Fig. 2Size, between 100 ~ 300 microns, is closed pore substantially.
Embodiment 2:
Foaming formulation is: EPDM100 part, and 0.5 part of benzoyl peroxide (BPO), 6 parts of Ac blowing agents, 3 parts, zinc oxide,1 part of stearic acid.
Operation:
(1) EPDM base-material is plasticated in mill, roller temperature is 60 DEG C, adds other auxiliary agent, finally adds foamingAgent, plays triangle bag 5 times, until blend composition mixes, tablet is taken off, and flattens while hot.
(2) by the tablet in step (1) framed middle through vulcanizing press preformed, pressure 5MPa, temperature 70 C, pre-Moulding 10min.
(3) then the tablet of precompressed is placed in mould and is foamed, under 160 DEG C of blowing temperatures and pressure 5MPa, foaming 5min,After having foamed, after expanded material is cooling, from mould, take off.
After testing: blending foaming material apparent density is 0.145g.cm-3, tearing strength is 3.59N/mm, hot strengthFor 0.51MPa, elongation at break 356%, your the A type hardness tester 4.5 that continues, expansion ratio 760%.
Density is pressed GB/T6342) 1995 tests; Tearing strength is pressed GB/T529) in 1999, without scarfing angle tear strengthStandard, tests; Hot strength is pressed GB/T528) 1998 tests.
Expanded material is after liquid nitrogen frozen brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 3, is found out by Fig. 3, basicBe closed pore, the abscess of abscess-size below 100 microns is more, also has some abscess-sizes to exceed 100 microns and even reaches 400Micron, is because foamed time is inadequate, and blowing agent decomposes not exclusively, foams insufficient.
Embodiment 3:
Foaming formulation is: EPDM100 part, and 0.5 part of benzoyl peroxide (BPO), 6 parts of Ac blowing agents, 3 parts, zinc oxide,1 part of stearic acid.
Operation:
(1) EPDM base-material is plasticated in mill, roller temperature is 60 DEG C, adds other auxiliary agent, finally adds foamingAgent, plays triangle bag 5 times, until blend composition mixes, tablet is taken off, and flattens while hot.
(2) by the tablet in step (1) framed middle through vulcanizing press preformed, pressure 5MPa, temperature 70 C, pre-Moulding 10min.
(3) then the tablet of precompressed is placed in mould and is foamed, under 160 DEG C of blowing temperatures and pressure 5MPa, foaming12min after having foamed, after expanded material is cooling, takes off from mould.
After testing: blending foaming material apparent density is 0.124g.cm-3, tearing strength is 3.21N/mm, stretches strongDegree is 0.40MPa, elongation at break 486%, your the A type hardness tester 3.9 that continues, expansion ratio 820.
Density is pressed GB/T6342) 1995 tests; Tearing strength is pressed GB/T529) in 1999, without scarfing angle tear strengthStandard, tests; Hot strength is pressed GB/T528) 1998 tests.
Expanded material is after liquid nitrogen frozen brittle failure, and the electron-microscope scanning figure of foam is shown in shown in accompanying drawing 4, is found out abscess by Fig. 4Size more than 100 microns, is closed pore substantially substantially, and foamed time is enough, and blowing agent decomposes completely, and foaming fully.
Table 1 does the formula (unit: mass parts) of variable for blowing agent;
Table 2 be expanded material foam density, hot strength, elongation at break, tearing strength, your A type hardness tester and sending out continuesBubble multiplying power is with the variation diagram of Ac foaming agent consumption;
Table 3 is formulas (unit: mass parts) that BPO consumption does variable;
Table 4 represent BPO consumption to EPDM foam plastic density, hot strength, elongation at break, tearing strength, your A type continuesThe impact of hardness and expansion ratio;
Table 5 is formulas (unit: mass parts) that ZnO does variable;
Table 6 represent ZnO consumption to EPDM foam plastic density, hot strength, elongation at break, tearing strength, your A type continuesThe impact of hardness and expansion ratio;
Table 7 represent forming temperature to EPDM foam plastic density, hot strength, elongation at break, tearing strength, your A continuesThe impact of type hardness tester and expansion ratio;
Table 8 represent briquetting pressure to EPDM foam plastic density, hot strength, elongation at break, tearing strength, your A continuesThe impact of type hardness tester and expansion ratio;
Table 9 represent molding time to EPDM foam plastic density, hot strength, elongation at break, tearing strength, your A continuesThe impact of type hardness tester and expansion ratio.
Table 1 blowing agent does the formula (unit: mass parts) of variable
In note: Ben Biaoge experiment, choose without exception forming temperature: 160 DEG C, briquetting pressure: 5MPa, foamed time 10min.
The impact of table 2AC foaming agent consumption on EPDM foamed plastics performance
Table 3BPO consumption does the formula (unit: mass parts) of variable
In note: Ben Biaoge experiment, choose without exception forming temperature: 160 DEG C, briquetting pressure: 5MPa, foamed time 10min.
The impact of table 4BPO consumption on EPDM foamed plastics performance
Table 5ZnO does the formula (unit: mass parts) of variable
In note: Ben Biaoge experiment, choose without exception forming temperature: 160 DEG C, briquetting pressure: 5MPa, foamed time 10min.
The impact of table 6ZnO consumption on EPDM foamed plastics performance
The impact of table 7 forming temperature on EPDM foamed plastics performance
Note: choose without exception briquetting pressure: 5MPa in this experiment, molding time: 10min; Same formula (weight portion):EPDM100, ZnO3, BPO0.5, AC blowing agent 6, stearic acid 1.
The impact of table 8 briquetting pressure on EPDM foamed plastics performance
Note: choose without exception forming temperature in this experiment: 160 DEG C, molding time: 10min; Same formula (weight portion):EPDM100, ZnO3, BPO0.5, AC blowing agent 6, stearic acid 1.
The impact of table 9 molding time on EPDM foamed plastics performance
Note: choose without exception briquetting pressure: 5MPa in experiment, forming temperature: 160 DEG C; Same formula: EPDM100, ZnO3, BPO0.5, AC blowing agent 6, stearic acid 1(mass parts).
Claims (8)
1. a preparation method for high foamability EPDM expanded material, the raw material group of described high foamability EPDM expanded materialBecome, count by weight:
EPDM100 part;
Crosslinking agent 0.5-1 part;
Ac blowing agent 4-10 part;
Zinc oxide 1-5 part;
Stearic acid 0.5-1 part;
It is characterized in that comprising the steps:
(1) by the proportioning of each raw material, EPDM base-material is plasticated in mill, plasticate in process, help to adding in base-materialAgent, after auxiliary agent mixes with base-material, takes off compound tablet, flattens while hot;
(2) by after the compound tablet preformed in step (1), compound tablet is placed in mould, foaming is processed, and has foamedCheng Hou, after material to be mixed is cooling, mold removal, obtains expanded material;
Described plasticating in process, the roller temperature of two roller mills is made as within the scope of 45-60 DEG C; The described auxiliary agent to adding in base-material,Just refer to after adding crosslinking agent, zinc oxide, stearic acid simultaneously and add again Ac blowing agent, in mixed process, play triangle bag 5-7 time,Until blend composition mixes; Two roller mills are in the time plasticating, and roll spacing is made as 1mm, and when blanking, roll spacing tunes up to 3mm.
2. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 1, is characterized in that: EPDM100 parts, 6 parts of Ac blowing agents; 0.5 part of crosslinking agent, 2 parts, zinc oxide, 1 part of stearic acid.
3. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 1, is characterized in that: described inEPDM Mooney viscosity 42, iodine number 12, ethylene contents 52%.
4. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 1, is characterized in that: crosslinking agentBe selected from cumyl peroxide DCP or benzoyl peroxide BPO.
5. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 1, is characterized in that: described pre-Forming operation is: compound tablet in 70 DEG C framed, preformed 10min under 5MPa pressure, at this temperature, EPDM had both expectedCan melting not foam again.
6. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 1, is characterized in that: describedBubble is treated to: foamed time 5-15min, blow pressure: 0-10MPa, blowing temperature: 150-180 DEG C.
7. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 6, is characterized in that: describedBubble is treated to: compound tablet is in electric heating constant-temperature blowing drying box, and 5-10min foams at 160～180 DEG C of temperature; Or mixedClose material tablet in vulcanizing press, under 160～180 DEG C of temperature and pressure 1～10MPa, foaming 10-15min.
8. the preparation method of a kind of high foamability EPDM expanded material as claimed in claim 7, is characterized in that: describedBubble is treated to: compound tablet in vulcanizing press, 170 DEG C of blowing temperatures, pressure 5MPa, foamed time 12min.
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| CN115368620B (en) * | 2022-09-16 | 2023-09-01 | 河南纳牛新材料科技有限公司 | PTFE foam material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101560315A (en) * | 2008-04-14 | 2009-10-21 | 上海大裕橡胶制品有限公司 | Modified foaming ethylene propylene diene rubber |
| CN102002193A (en) * | 2010-11-19 | 2011-04-06 | 四川宏亿复合材料工程技术有限公司 | Foamed rubber plate and manufacturing process thereof |
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| JP2011032988A (en) * | 2009-08-05 | 2011-02-17 | Nitto Denko Corp | Foam filler for wind turbine generator blade, foam filling part for wind turbine generator blade, wind turbine generator blade, wind turbine generator, and method of manufacturing wind turbine generator blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101560315A (en) * | 2008-04-14 | 2009-10-21 | 上海大裕橡胶制品有限公司 | Modified foaming ethylene propylene diene rubber |
| CN102002193A (en) * | 2010-11-19 | 2011-04-06 | 四川宏亿复合材料工程技术有限公司 | Foamed rubber plate and manufacturing process thereof |
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Effective date of registration: 20201109 Address after: Fengli town Xinjian West Road, Rudong County, Nantong City, Jiangsu Province 226400 Patentee after: Rudong Wenyuan investment and Development Co., Ltd Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |
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