CN1082562A - Electroconductibility ethene-vinyl acetate copolymer plastic and method for making thereof - Google Patents
Electroconductibility ethene-vinyl acetate copolymer plastic and method for making thereof Download PDFInfo
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- CN1082562A CN1082562A CN 92109387 CN92109387A CN1082562A CN 1082562 A CN1082562 A CN 1082562A CN 92109387 CN92109387 CN 92109387 CN 92109387 A CN92109387 A CN 92109387A CN 1082562 A CN1082562 A CN 1082562A
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Abstract
The present invention system provides electroconductibility EVA foam and manufacture method thereof, ties up to admixture among the EVA quantitative processing aid such as iodine cigarette, whipping agent, frothing aid, disperses agent, organo-peroxide is made bridging agent and metal oxide or the like.Stir via kneader, mix through mixing machine again, discharging machine discharging section, the pressurization of heating in oil press at last is to make electroconductibility EVA foam.
Description
The present invention system is about tool electroconductibility EVA closed type cell foamed plastics and method for making thereof.
General material is according to the size of intrinsic volume resistance value, can be divided into electrical conductor, antistatic body, with the isolator three major types.The intrinsic volume resistance value of electrical conductor is between 0 to the 100 k ohm cm, and the intrinsic volume resistance value of antistatic body is between 100 to the 200 k ohm cm, and the intrinsic volume resistance value of the antistatic body of isolator is 200 k ohm cm.
Traditional plastic cement overwhelming majority is an isolator, and having only small portion is antistatic body, and this is rare especially as the electrical conductor person.And generally the characteristic of foamed plastics is that electrical insulating property is height with thermal insulation than traditional plastic cement person, so general foamed plastics electric durability is good and thermotolerance is good, this for traditional plastic cement and foamed plastics in character, shape, and application on neither same part.Structure according to the foamed plastics bubble formation, can be divided into closed type cell foamed plastics and open type cell foamed plastics two big classes, each bubble in the closed type cell foamed plastics is all surrounded by plastics film, and the bubble in the open type cell foamed plastics all connects each other.Generally speaking, the intrinsic volume resistance value of closed type cell foamed plastics ratio open formula cell foamed plastics is higher, and promptly electrical insulating property is better and electroconductibility is poorer.Developed several electroconductibility plastic cement at present, but the exploitation of tool electroconductibility open type cell foamed plastics to the utmost be the difficulty, more do not discussed the exploitation of tool electroconductibility closed type cell foamed plastics.With state-of-the-art development technique, also the intrinsic volume resistance value of closed type cell foamed plastics can only be dropped to about 100 k ohm cm, and the intrinsic volume resistance value of open type cell foamed plastics to desire to reduce to 100 k ohm cm to the utmost with traditional method for making be difficulty, it is following that more opinion has not been reduced to 50 k ohm cm.
The present invention's main purpose is for providing a kind of EVA(Ethylene vinyl acetate copolymer) closed type cell foamed plastics, have good electrical conductivity and its intrinsic volume resistance value at 50 k ohm cm or following.
The present invention's a time purpose is for providing a kind of EVA closed type cell foamed plastics, has low, not mouldy, and the characteristic such as resiliency is good of light weight, thermal conductance degree.
In the electroconductibility EVA that makes the present invention mainly is when being constituted closed type cell foamed plastics by (ethylene-vinyl acetate fat co-polymer) and other constituents, based on EVA, add the electroconductibility iodine cigarette of suitable composition, and whipping agent, dispersing processing aids such as agent, bridging agent, under suitable temperature and pressure, stir and mix, cut into slices again discharging and add sulphur after make finished product.
EVA mainly is made of ethylene-vinyl acetate fat co-polymer and other constituents.It has the characteristics such as thermotolerance, light weight, low-gravity, water tolerance, snappiness, weather resisteant and anti-collision of excellence.And the present invention's EVA closed type cell foamed plastics has fine even closure bubble, and has the electroconductibility and the buffering character of excellence, the most important thing is that its intrinsic volume resistance value is in 50 k ohm cm or following excellent specific property.
Whipping agent used in the present invention is ADCA(Azodicarbonamide) belong to the organic blowing agent class, its diversity is good, and produces nitrogen, can not cause any infringement to former plastics.The organo-peroxide that the present invention uses is DCP(Dicumyl Peroxide), DCP can make ethylene-vinyl acetate fat co-polymer produce crosslinked three-dimensional arrangement.The present invention also uses following processing aid in addition: conduction iodine cigarette, disperse agent such as Zinic stearas, lubricant such as stearic acid, whipping agent such as zinc oxide etc.
The embodiment of method for making of the present invention is as follows:
Embodiment one: intrinsic volume resistance value is the EVA closed type cell foamed plastics about 50 k ohm cm
The foaming constituent
The composition parts by weight
EVA 100
ADCA 3
DCP 0.65
Zinc oxide 3
Zinic stearas 1
Stearic acid 1
Conduction iodine cigarette 20
When room temperature, above-mentioned each composition is blended in the kneader and stirred 10 minutes, in the time of 100 ℃ to 110 ℃, place mixing machine to mix 8 minutes in the mixture of above-mentioned stirring again, make each uniform ingredients be dispersed into mud shape thing.Yet become sheet after in the time of 80 ℃ to 90 ℃, above-mentioned mud shape thing being placed the discharging machine discharging, be sliced into suitable length and width again.In the time of 170 ℃ to 175 ℃, place oil press to be forced into 150kg/cm at last
215 minutes, then EVA closed type cell foamed plastics was made, and its intrinsic volume resistance value is about 50 k ohm cm.
Embodiment two: intrinsic volume resistance value is the EVA closed type cell foamed plastics about 30 k ohm cm
The foaming constituent
The composition parts by weight
EVA 100
ADCA 3
DCP 0.8
Zinc oxide 3
Zinic stearas 3
Stearic acid 1.5
Conduction iodine cigarette 25
When room temperature, above-mentioned each composition is blended in the kneader and stirred 15 minutes, in the time of 100 ℃ to 110 ℃, place mixing machine to mix 10 minutes in the mixture of above-mentioned stirring again, make each uniform ingredients be dispersed into mud shape thing.Yet become sheet after in the time of 80 ℃ to 90 ℃, above-mentioned mud shape thing being placed the discharging machine discharging, be sliced into suitable length and width again.In the time of 170 ℃ to 175 ℃, place oil press to be forced into 150kg/cm at last
215 minutes, then EVA closed type cell foamed plastics was made, and its intrinsic volume resistance value is about 30 k ohm cm.
The above is two most preferred embodiments, but the present invention's composition is not limited to above-mentioned two most preferred embodiments, and can change enforcement in certain scope.If EVA keeps 100 parts by weight, then ADCA can be 1 to 5 part, and zinc oxide can be 3 to 10 parts, and Zinic stearas can be 1 to 5 part, and stearic acid can be 1 to 3 part, and conduction iodine cigarette can be 15 to 25 parts, and the peralcohol bridging agent can be 0.6 to 1.0 part.In stirring 7 to 15 minutes in kneader under the room temperature, mixing time can be 5 to 10 minutes in mixing machine, and the temperature after discharging is shaped in oil press can be 165 ℃ to 180 ℃, and pressure can be 100 to 200kg/cm
2, can be 10 to 30 minutes clamping time can be shaped.
Review the clear 61-66729(JP 866729 of Japan special permission Room special permission communique) the contents are as follows: its method for making system adopts extruder moulding method, this case system adopts the oil press moulding method, its whipping agent and processing aid system adopt the toxic whipping agent of volatile liquid Butan or Yalon, so processing safety is bad the staff there is the long-term potential injury of occupational, decomposition type AC whipping agent is then adopted in this case, it is good that processing safety is quoted case as proof, pay attention under the social condition of environmental consciousness in society now, the non-polluting method for making of this case before Japan quotes as proof case be good.And quote as proof case to add the sulphur system different with this case, adopt the moulding of extrusion molding machine so can't adopt superoxide (DCP) system because of it, so the product that product and this case method for making are done is different.(according to table one, embodiment three best resistance values are 6.4 * 10 to quote the whipping agent that case is an antistatic effect again with regard to product as proof
4) be applicable to wrapping material so conductive effect is poor, this is because this product is non-for independent whipping agent, thus its mechanical characteristics and physical property with and electroconductibility can't compare with this product, its electroconductibility of the product of this case can reach 3 * 10
3Below.
According to the clear 60-20942(JP 8520942 of Japan's special permission Room special permission communique) the contents are as follows: electroconductibility such as the metal oxides such as zinc white, stannic oxide and weisspiessglanz of quoting case system utilization metal oxide as proof are mixed in the particles, utilize a kind of method of the electroconductibility hybrid process production foaming and molding of metal oxide again, it is a kind of anlistatig electroconductibility foaming plate, the very high electroconductibility that can't be defined as of its resistance value only is that (according to embodiment one, the electric resistance value in surface is 3 * 10 to a kind of antistatic material at most
7, embodiment two, and the electric resistance value in surface is 1 * 10
6), utilize the production method of electroconductibility charcoal cigarette inequality fully with this case.
According to the clear 63-218342(JP 88218342 of Japan's special permission Room special permission communique) the contents are as follows: its mode of production is not mechanical type production, cover with paint, lacquer, colour wash, etc. a kind of foam antistatic products but adopt a kind of thermoplastic synthetic resin emulsion to add the charcoal cigarette again in package material surface, its purposes only limits the use of in covering with paint, lacquer, colour wash, etc. wrapping material, as paper product, woodwork etc., with a kind of Packaging Method of the static resistance function of the resiliency function of utilizing its foam and semi-conductor, the performance of its production method and products thereof is all very big with this case difference.
JP 83198537[EVA wherein] the antistatic material special permission communique of multipolymer: its building method should be approximate with JP 8520942, because of it only is antistatic material, the resistance value of its electroconductibility is fixed to be surpassed a lot of than this case, what deserves to be mentioned is this case because the scope that electroconductibility is good and impact resistance is applicable is very wide, can protect such as being covered in TV, receiving set that signal purifies or it is made sole can reach the electric charge on the health on the ground, can not reproduce into the static electricity on human body and injure or the like purposes, exceedingly useful to a people's daily life.
The present invention's EVA closed type cell foamed plastics has fine even closure bubble, this closure bubble is because the constituent material forms the continuity CAB, so material is not interrupted, so the resistance value of special good its intrinsic volume of electroconductibility is in 50 k ohm cm or following excellent specific property, and, compare the characteristics that have more its progressive with above-mentioned day this case because bubble sealing more has thermotolerance, light weight, the proportion of excellence little, water tolerance and characteristic such as shock-resistant.
For making MOS(oxidation technology semi-conductor), the big N-type semiconductorN polar body of LSI(circuit) major technology on problem be how to prevent static.Especially low in humidity, or use when using MOS type polar body circuit in the room of heavy back blanket electrostatic breakdown takes place easily, be a very important problem so how to prevent static.
With regard to electrical principles, the gate oxide film of MOS electric crystal must approach a bit.For signal is imposed on gate, utilize the electric current of its voltage control passage, then oxide film is thin more, and its effect is big more.But because directly impose between gate and the source electrode from the voltage of outside, if oxidation is lepthymenia, voltage then takes place destroy, particularly the impedance ratio of gate is higher, and is destroyed easily.
The resistance to pressure of gate film is hundreds of volts, and the voltage of generation of static electricity can reach thousands of volts.Therefore,, must prevent the IC(IC basically if desire to prevent the fault of MOS type IC) in addition charged, in case big discharge is taken place in IC.Prevent that the human body static electrification from also being one of them, and use the electroconductibility plastic cement also to become a kind of effective means.
Adopt the articles for use of IC, instrument or the material that collocation is used with IC all can use the electroconductibility plastic cement, take this just can prevent fault.Electroconductibility EVA foamed plastics can be protected IC, prevents the electric mechanical noise, purposes such as bale packing precision component.
Claims (1)
1, a kind of electroconductibility EVA foamed plastics and method for making thereof is characterized in that: closed type foamed plastics constituent has: contain the EVA of 100 parts by weight, the whipping agent ADCA (Azodicarbonamide) of 1 to 5 parts by weight, the zinc oxide of 3 to 10 parts by weight, the Zinic stearas of 1 to 5 parts by weight, the stearic acid of 1 to 3 parts by weight, the conduction soot of 15 to 25 parts by weight, the superoxide bridging agent of 0.6 to 1.0 parts by weight.
Above-mentioned constituent stirred under room temperature 7 to 15 minutes, and remix 5 to 10 minutes can be shaped with the oil press pressurization after discharging is shaped in 100 to 200kg/cm10 to 30 minute again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92109387 CN1082562A (en) | 1992-08-18 | 1992-08-18 | Electroconductibility ethene-vinyl acetate copolymer plastic and method for making thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92109387 CN1082562A (en) | 1992-08-18 | 1992-08-18 | Electroconductibility ethene-vinyl acetate copolymer plastic and method for making thereof |
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|---|---|
| CN1082562A true CN1082562A (en) | 1994-02-23 |
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| CN 92109387 Pending CN1082562A (en) | 1992-08-18 | 1992-08-18 | Electroconductibility ethene-vinyl acetate copolymer plastic and method for making thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392079B (en) * | 2008-10-10 | 2011-05-04 | 常州天晟新材料股份有限公司 | Conductive ethylene-vinyl acetate co-polymer foamed profile and preparation method thereof |
| CN102731890A (en) * | 2012-06-19 | 2012-10-17 | 苏州伟伦运动休闲用品有限公司 | Shock-absorbing EVA material and production method thereof |
| CN102816373A (en) * | 2012-08-27 | 2012-12-12 | 苏州伟伦运动休闲用品有限公司 | Highly elastic EVA material and its production method |
| CN103214798A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Special density adjustor for polyester |
| CN103214719A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Low-pressure polyethylene density regulator |
| CN103214724A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Special density regulator for ethylene-vinyl acetate copolymer |
| CN103214818A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Polycarbonate density adjustor |
| CN103214784A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Polyformaldehyde density adjustor |
| CN103214720A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Linear polyethylene density regulator |
| CN103450545A (en) * | 2013-08-22 | 2013-12-18 | 深圳市兴业卓辉实业有限公司 | Anti-static sole material for clean room and manufacturing method thereof |
-
1992
- 1992-08-18 CN CN 92109387 patent/CN1082562A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392079B (en) * | 2008-10-10 | 2011-05-04 | 常州天晟新材料股份有限公司 | Conductive ethylene-vinyl acetate co-polymer foamed profile and preparation method thereof |
| CN102731890B (en) * | 2012-06-19 | 2013-11-13 | 苏州伟伦运动休闲用品有限公司 | Shock-absorbing EVA material and production method thereof |
| CN102731890A (en) * | 2012-06-19 | 2012-10-17 | 苏州伟伦运动休闲用品有限公司 | Shock-absorbing EVA material and production method thereof |
| CN102816373A (en) * | 2012-08-27 | 2012-12-12 | 苏州伟伦运动休闲用品有限公司 | Highly elastic EVA material and its production method |
| CN102816373B (en) * | 2012-08-27 | 2014-07-02 | 苏州伟伦运动休闲用品有限公司 | Highly elastic EVA material and its production method |
| CN103214798A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Special density adjustor for polyester |
| CN103214818A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Polycarbonate density adjustor |
| CN103214784A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Polyformaldehyde density adjustor |
| CN103214720A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Linear polyethylene density regulator |
| CN103214724A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Special density regulator for ethylene-vinyl acetate copolymer |
| CN103214719A (en) * | 2013-04-26 | 2013-07-24 | 中塑联新材料科技湖北有限公司 | Low-pressure polyethylene density regulator |
| CN103450545A (en) * | 2013-08-22 | 2013-12-18 | 深圳市兴业卓辉实业有限公司 | Anti-static sole material for clean room and manufacturing method thereof |
| CN103450545B (en) * | 2013-08-22 | 2016-06-08 | 深圳市兴业卓辉实业有限公司 | A kind of Anti-static sole material for clean room and manufacture method thereof |
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