CN105237890A - EPDM/PP thermoplastic elastomer with electromagnetic shielding property - Google Patents
EPDM/PP thermoplastic elastomer with electromagnetic shielding property Download PDFInfo
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- CN105237890A CN105237890A CN201510732122.4A CN201510732122A CN105237890A CN 105237890 A CN105237890 A CN 105237890A CN 201510732122 A CN201510732122 A CN 201510732122A CN 105237890 A CN105237890 A CN 105237890A
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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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
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
Abstract
The invention relates to an EPDM/PP thermoplastic elastomer with electromagnetic shielding property. The EPDM/PP thermoplastic elastomer consists of the following raw materials in parts by weight: 10-15 parts of EPDM rubber,10-15 parts of PP resin, 0.01-0.05 part of a coupling agent, 0.005-0.01 part of an assistant crosslinker, 0.5-1.5 parts of a vulcanizing agent, 4-6 parts of an accelerant and 73.5-76.5 parts of conductive filler. The EPDM/PP thermoplastic elastomer has the characteristics of good oil resistance, good chemical stability, excellent mechanical performance and relatively low cost, and also has the advantages such as excellent conductive performance, a stable resistance time character and the like.
Description
Technical field
The present invention relates to a kind of EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding and preparation method thereof, belong to field of polymer composite material.
Background technology
Along with the fast development of modern electronics industry, the sharply increase of various wireless communication system and high-frequency electron device quantity, result in electromagnetic interference phenomenon to increase with electromagnetic pollution problem outstanding day by day.Shield technology is as main electromagnetism interference technology, and its main method adopts various shielding material effectively to intercept and loss electromagnetic radiation.Current application more widely shielding material is conductive polymer composite, and this material has the advantages such as electromagnetic shielding efficiency is high, quality is light, corrosion-resistant.
At present, electromagnetic shielding macromolecule composite material on market, its polymer base-material mainly adopts silastic material, although silastic material has good electric property, weathering resistance and high-low temperature resistant stability etc., but their current price is higher, especially has the silicon rubber of property, and its price is higher.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of with the EPDM/PP thermoplastic elastomer of low cost for carrier, wherein by adding conductive filler material and obtained EPDM/PP conducing composite material.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding, is made up of the raw material of following weight part: EPDM rubber 10 ~ 15 parts, PP resin 10 ~ 15 parts, coupling agent 0.01 ~ 0.05 part, additional crosslinker 0.005 ~ 0.01 part, vulcanizing agent 0.5 ~ 1.5 part, promotor 4 ~ 6 parts, conductive powder body 73.5 ~ 76.5 parts.
Gain effect of the present invention is: a kind of EPDM/PP thermoplastic elastomers with capability of electromagnetic shielding has superior mechanical property and scale resistance, the advantage such as ozone-resistant and anti-erosion, and capability of electromagnetic shielding is excellent simultaneously, has good cost performance.Can be applied to communication terminal, notebook computer, digital audiovisual and other signal equipments etc., to meet middle-and high-end applications.
The described EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding, Chinese name is terpolymer EP rubber and polypropylene thermoplastic elastomer multipolymer.The topmost characteristic of EPDM/PP thermoplastic elastomer is exactly its superior mechanical property and resistance to oxidation, ozone-resistant and erosion-resistant ability.Because terpolymer EP rubber belongs to polyolefine family, it has fabulous vulcanization characteristics, minimum proportion and can absorb a large amount of fillers and minimum to Effect on Mechanical Properties.Polypropylene is a kind of more common hemicrystalline thermoplastic resin, and have higher shock-resistance, mechanical property is tough, antiacid caustic corrosion.Therefore EPDM/PP thermoplastic elastomer can the cheap and conducing composite material base material of good physical properties of cost of manufacture.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described EPDM/PP thermoplastic elastomer refers to the polymer composite that EPDM and PP gathers with mass ratio 1:1.
Further, described coupling agent is Z-6341.
The Chinese of coupling agent Z-6341 is called n-octytriethoxysilane, and Dow corning company limited produces, for improving avidity between polymer composite base material and mineral filler and wettability.
8. further, described vulcanizing agent is organo-peroxide; Such as, a kind of or two or more arbitrarily mixture in boron phosphide BP (BP), 2.4-dichlorobenzoperoxide (DCBP), dicumyl peroxide (DCP).Described additional crosslinker is any one or a few the mixture in triallyl nitrile isourea acid esters, Vinylstyrene, diallyl maleate.
Further, described promotor is one or both mixtures in zinc oxide and stearic acid.
Further, described conductive powder body is a kind of or two or more arbitrarily mixture in fine silver conductive powder body, pure nickel conductive powder body, silver-colored nickel coat conductive powder body, silver-colored copper-clad conductive powder body, nickel bag graphite conductive powder body.
Described conductive powder body forms according to the weight ratio of 9:1 by large and small two kinds of particle diameter powders, and the particle size of Large stone is 60 ~ 120 μm, and the particle size of small particle size is 30 ~ 45 μm.
In addition, according to performance need, the EPDM/PP thermoplastic elastomer that the present invention has capability of electromagnetic shielding can also comprise antioxidant, promoting agent, softening agent.
There is an EPDM/PP process for preparation of thermoplastic elastomer for capability of electromagnetic shielding, comprise the following steps:
1) conductive powder body drying and conductive powder body particle diameter pole are joined
Conductive powder body is carried out baking 4h in 80 DEG C of baking ovens, to remove moisture, and then according to the weight ratio of 9:1, to get particle diameter be respectively the powder of 60 ~ 100 μm and particle diameter is that the powder of 30 ~ 45 μm mixes by the conductive powder body after baking, the conductive powder body of two kinds of different-grain diameters is tentatively mixed, obtains mixed conductive powder body;
2) conductive powder body is coated
Silane coupling agent is joined step 1) in the mixed conductive powder body that obtains, by dry process, obtain the conductive powder body of coated one deck silane coupling agent;
3) compound
First by EPDM rubber plastic steelmaking 5 ~ 10min, processing temperature 170 ~ 185 DEG C, shearing rate 470 ~ 500s
-1, then add PP mastication of resins 5 ~ 10min, processing temperature 200 ~ 210 DEG C, shearing rate 470 ~ 500s
-1, then add step 2) conductive powder body of coated one deck silane coupling agent that obtains, carry out mixing and to plasticate 10 ~ 15min, finally add vulcanizing agent, additional crosslinker and promotor, dynamic vulcanization 8 ~ 12min, namely obtain described EPDM/PP thermoplastic elastomer.
Described dry process also claims pre-mixing, silane coupling agent is surface treatment agent, perfect condition makes it make the coated upper silicon ester coupling agent of each conductive powder body particle surface, in order to reach this object, silane coupling agent after weighing is added drop-wise in conductive powder body and mixes, put into ball mill low speed mixing, this process is just called dry process.
Described plasticating is the procedure that polymer composite is processed, and refer to the method adopting mechanical blending, reduction rubber molecular weight and viscosity to improve its plasticity-, and obtain suitable mobility, to meet the needs of mixing and shaping further processing.The process of plasticating makes rubber macromolecule splitting of chain, and molecular chain is made the process of even molecular weight distribution by long shortening.
Further, in step 1) described in baking time be 4 ~ 8 hours.
This preparation method is better than the preparation method added together with each components such as EPDM rubber and vulcanization system in the PP resin of melting, ensure that EPDM and PP reaches abundant blending dispersion before sulfuration, overcomes the processing difficulties of sulfuration limit, limit dispersion.
Embodiment
Be described principle of the present invention and feature below, example, only for explaining the present invention, is not intended to limit scope of the present invention.
(1) raw material is prepared
AEPDM rubber
BPP resin
C vulcanizing agent: BP, DCBP, DCP
D coupling agent: Z-6341
E additional crosslinker: triallyl nitrile isourea acid esters
F promotor: zinc oxide
G conducting powder:
G1 fine silver conducting powder (median size 40 μm)
G2 silver copper-clad conducting powder (median size 70 μm)
G3 nickel bag graphite (median size 30 μm)
G4 nickel bag graphite (median size 80 μm)
Embodiment 1:
1) conductive powder body drying and conductive powder body particle diameter pole are joined
Be averaged particle diameter 30 μm of nickel bag graphite conducting powder 75.05g and median size 80 μm of nickel bag graphite conducting powder 675.95g to dewater in 80 DEG C of baking ovens 4h, then mix, obtain mixed conductive powder body;
2) conductive powder body is coated
Z-63410.4g is joined step 1) in the mixed conductive powder body that obtains, by dry process, obtain the conductive powder body of coated one deck silane coupling agent;
3) compound
First plasticate EPDM rubber 100g 8min, processing temperature 185 DEG C, shearing rate 470s
-1, then add PP resin 100g and to plasticate 10min, processing temperature 205 DEG C, shearing rate 490s
-1add step 2 again) the conductive powder body 751.4g of coated one deck silane coupling agent that obtains, carries out mixing and to plasticate 12min, finally add BP6g, DCP3g, triallyl nitrile isourea acid esters 0.1g and zinc oxide 40g, dynamic vulcanization 12min, namely obtains EPDM/PP thermoplastic elastomer.
Embodiment 2:
1) conductive powder body drying and conductive powder body particle diameter pole are joined
Be averaged particle diameter 40 μm of fine silver conducting powder 74.74g and the silver-colored copper-clad conducting powder 672.66g of median size 70 μm to dewater in 80 DEG C of baking ovens 4h, then mix, obtain mixed conductive powder body;
2) conductive powder body is coated
Z-63410.5g is joined step 1) in the mixed conductive powder body that obtains, by dry process, obtain the conductive powder body of coated one deck silane coupling agent;
3) compound
First plasticate EPDM rubber 100g 8min, processing temperature 185 DEG C, shearing rate 470s
-1, then add PP resin 100g and to plasticate 10min, processing temperature 205 DEG C, shearing rate 490s
-1add step 2 again) the conductive powder body 747.9g of coated one deck silane coupling agent that obtains, carries out mixing and to plasticate 12min, finally add DCBP6g, DCP6g, triallyl nitrile isourea acid esters 0.1g and zinc oxide 40g, dynamic vulcanization 12min, namely obtains EPDM/PP thermoplastic elastomer.
Embodiment 3:
1) conductive powder body drying and conductive powder body particle diameter pole are joined
Be averaged particle diameter 40 μm of fine silver conducting powder 68.86 and median size 80 μm of nickel bag graphites electricity powder 619.79g to dewater in 80 DEG C of baking ovens 4h, then mix, obtain mixed conductive powder body;
2) conductive powder body is coated
Z-63410.3g is joined step 1) in the mixed conductive powder body that obtains, by dry process, obtain the conductive powder body of coated one deck silane coupling agent;
3) compound
First plasticate EPDM rubber 100g 8min, processing temperature 185 DEG C, shearing rate 470s
-1, then add PP resin 100g and to plasticate 10min, processing temperature 205 DEG C, shearing rate 490s
-1add step 2 again) the conductive powder body 688.95g of coated one deck silane coupling agent that obtains, carries out mixing and to plasticate 12min, finally add BP3g, DCBP3g, triallyl nitrile isourea acid esters 0.05g and zinc oxide 55g, dynamic vulcanization 12min, namely obtains EPDM/PP thermoplastic elastomer.
For verifying product performance of the present invention, do following test
(1) resistivity measurement
By the EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding obtained for embodiment 1 ~ 3, by within 15 minutes, obtaining thick 2mm 175 DEG C of mold pressings, the rectangular sheet of 100mm × 100mm, after recording resistance, and calculate its resistivity, result is as shown in table 1, and obtained EPDM/PP thermoplastic elastomers has good electroconductibility.
(2) tensile strength, elongation at break and tear strength test
The EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding obtained for enforcement 1 ~ 3 is tested its tensile strength by GB/T528-1998 and GB/T529-1999, elongation at break and tear strength, result (see table 1), shows that the present invention has good mechanical property.
(3) ageing-resistant performance test
By the EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding obtained for preparation embodiment 1 ~ 3, by within 15 minutes, obtaining thick 2mm 175 DEG C of mold pressings, the rectangular sheet of 100mm × 100mm, place 72 hours in 150 DEG C of air dry ovens, survey its age resistor, tensile strength, elongation at break and tear strength, shown in result (see table 1), property indices change is little, shows that the present invention has good ageing resistance and electric performance stablity.
(4) capability of electromagnetic shielding test
The EPDM/PP thermoplastic elastomer with capability of electromagnetic shielding obtained for enforcement 1 ~ 3 is tested its capability of electromagnetic shielding according to China Electronics industry military standard SJ20524-1995, result (see table 1), shows that the present invention has good capability of electromagnetic shielding.
Table 1 embodiment 1 ~ 3 test result
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all within principle of the present invention, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. one kind has the EPDM/PP thermoplastic elastomer of capability of electromagnetic shielding, it is characterized in that, be made up of the raw material of following weight part: EPDM rubber 10 ~ 15 parts, PP resin 10 ~ 15 parts, coupling agent 0.01 ~ 0.05 part, additional crosslinker 0.005 ~ 0.01 part, vulcanizing agent 0.5 ~ 1.5 part, promotor 4 ~ 6 parts, conductive filler material 73.5 ~ 76.5 parts;
Described EPDM rubber is terpolymer EP rubber, and PP resin is acrylic resin, and terpolymer EP rubber and acrylic resin are the mixture of 1:1 mass ratio.
2. thermoplastic elastomer according to claim 1, is characterized in that, described coupling agent is silane coupling agent Z-6341.
3. thermoplastic elastomer according to claim 1, it is characterized in that, described additional crosslinker is any one or a few the mixture in triallyl nitrile isourea acid esters, Vinylstyrene, diallyl maleate.
4. thermoplastic elastomer according to claim 1, is characterized in that, described vulcanizing agent is organo-peroxide, comprises; Any one or a few mixture in boron phosphide BP, 2.4-dichlorobenzoperoxide, dicumyl peroxide.
5. thermoplastic elastomer according to claim 1, is characterized in that, described promotor is the mixture of any one or two kinds in zinc oxide and stearic acid.
6. thermoplastic elastomer according to claim 1, is characterized in that, described conductive powder body is any one or a few the mixture in fine silver conductive powder body, silver-colored copper-clad conductive powder body, nickel bag graphite conductive powder body; By particle diameter, to be the powder of 60 ~ 120 μm and particle diameter be conductive powder body that the powder of 30 ~ 45 μm forms, and the weight ratio of the powder of the powder that particle diameter is 60 ~ 120 μm and particle diameter 30 ~ 45 μm is 9:1.
7. thermoplastic elastomer according to claim 1, is characterized in that, comprises following preparation process:
1) conductive powder body drying and conductive powder body particle diameter pole are joined
Conductive powder body is carried out baking 4h in 80 DEG C of baking ovens, to remove moisture, and then according to the weight ratio of 9:1, to get particle diameter be respectively the powder of 60 ~ 100 μm and particle diameter is that the powder of 30 ~ 45 μm mixes by the conductive powder body after baking, the conductive powder body of two kinds of different-grain diameters is tentatively mixed, obtains mixed conductive powder body;
2) conductive powder body is coated
Silane coupling agent is joined step 1) in the mixed conductive powder body that obtains, by dry process, obtain the conductive powder body of coated one deck silane coupling agent;
3) compound
First by EPDM rubber plastic steelmaking 5 ~ 10min, processing temperature 170 ~ 185 DEG C, shearing rate 470 ~ 500s
-1, then add PP mastication of resins 5 ~ 10min, processing temperature 200 ~ 210 DEG C, shearing rate 470 ~ 500s
-1, then add step 2) conductive powder body of coated one deck silane coupling agent that obtains, carry out mixing and to plasticate 10 ~ 15min, finally add vulcanizing agent, additional crosslinker and promotor, dynamic vulcanization 8 ~ 12min, namely obtain EPDM/PP thermoplastic elastomer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510732122.4A CN105237890A (en) | 2015-11-02 | 2015-11-02 | EPDM/PP thermoplastic elastomer with electromagnetic shielding property |
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| CN201510732122.4A CN105237890A (en) | 2015-11-02 | 2015-11-02 | EPDM/PP thermoplastic elastomer with electromagnetic shielding property |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017183644A (en) * | 2016-03-31 | 2017-10-05 | タツタ電線株式会社 | Electromagnetic wave shield film |
| CN109054188A (en) * | 2018-06-29 | 2018-12-21 | 安徽尼古拉电子科技有限公司 | A kind of radar absorbing of high absorbent capacity and preparation method thereof |
| CN112143117A (en) * | 2020-10-15 | 2020-12-29 | 深圳市飞荣达科技股份有限公司 | Conductive fiber reinforced shielding material and preparation method thereof |
| CN113717477A (en) * | 2021-09-08 | 2021-11-30 | 山东结力新材料科技有限公司 | Conductive ASA film and manufacturing method and application product thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205337A (en) * | 2006-12-20 | 2008-06-25 | 上海日之升新技术发展有限公司 | Preparation of conductive dynamically vulcanized thermoplastic elastomer material |
| CN102585385A (en) * | 2012-02-20 | 2012-07-18 | 深圳德邦界面材料有限公司 | Ethylene-Propylene-diene monomer (EPDM)-based conductive rubber and preparation method thereof |
-
2015
- 2015-11-02 CN CN201510732122.4A patent/CN105237890A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205337A (en) * | 2006-12-20 | 2008-06-25 | 上海日之升新技术发展有限公司 | Preparation of conductive dynamically vulcanized thermoplastic elastomer material |
| CN102585385A (en) * | 2012-02-20 | 2012-07-18 | 深圳德邦界面材料有限公司 | Ethylene-Propylene-diene monomer (EPDM)-based conductive rubber and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017183644A (en) * | 2016-03-31 | 2017-10-05 | タツタ電線株式会社 | Electromagnetic wave shield film |
| CN109054188A (en) * | 2018-06-29 | 2018-12-21 | 安徽尼古拉电子科技有限公司 | A kind of radar absorbing of high absorbent capacity and preparation method thereof |
| CN112143117A (en) * | 2020-10-15 | 2020-12-29 | 深圳市飞荣达科技股份有限公司 | Conductive fiber reinforced shielding material and preparation method thereof |
| CN113717477A (en) * | 2021-09-08 | 2021-11-30 | 山东结力新材料科技有限公司 | Conductive ASA film and manufacturing method and application product thereof |
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Application publication date: 20160113 |