CN107602978A - A kind of preparation method of crosslinking polyethylene conductive expanded material - Google Patents
A kind of preparation method of crosslinking polyethylene conductive expanded material Download PDFInfo
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Abstract
The invention discloses a kind of preparation method of crosslinking polyethylene conductive expanded material, comprise the following steps：（1）Dilute azodicarbonamide, conductive black, toughener, antioxidant, lubricant, colouring agent respectively with low density polyethylene (LDPE), pass through double screw extruder extruding pelletization；（2）With low density polyethylene (LDPE) and raw material was diluted and had been well mixed with mixer；（3）Sheet material is extruded into through single screw extrusion machine and is wound；（4）By high-energy electron irradiation crosslinking Treatment；（5）Foam to obtain finished sheet by foam process.Preparation method of the present invention is effectively improved the dispersiveness of conductive black, reduces dosage, fine and smooth uniform, the resistivity stabilization of product abscess of acquisition, electric conductivity is good, high mechanical strength, processing characteristics are good.
Description
Technical field
The present invention relates to conductive foaming material technical field, and in particular to a kind of system of crosslinking polyethylene conductive expanded material
Preparation Method.
Background technology
In recent years, the conductive foaming material with Electromagnetic Interference function of shielding is widely used in multiple fields, main collection
In in fields such as electronics, communication, automobile, military project, space flight and require antistatic, shielding, protecting against shock, fire-retardant, heat-resisting environment,
Such as TV, display, mobile phone, computer, Medical Instruments.
At present, the conductive foaming material on domestic market is mainly antistatic pearl cotton and die briquetting shaped polyethylene or EVA
Conducting foam.Antistatic pearl cotton is uncrosslinked polythene material, and using physical blowing, abscess is larger, and resilience is poor, multiplying power list
One, thickness error is larger, and surface resistivity and specific insulation are unstable.And the polyethylene or EVA conductive materials of moulded from foam
Although bubble is empty fine and smooth, its mechanical performance compares cross-linking radiation（IXPE）Product is poor, and secondly processing limitation is big, product surface quality
It is bad.Both expanded materials are using conductive black as conducting medium, and compared with foreign countries, domestic conductive black still has certain
Gap：Mainly middle-grade or low grade products is more, the poor-performing in terms of dispersiveness, resistivity, is added typically by increase
Measure to improve the electric conductivity of expanded material, and the addition of conducting medium is too big, easily pollution contact article, and influence material
Mechanical performance, shaping when easy embrittlement, if relying on import conductive black, cost can greatly improve.
The Chinese invention patent of Application No. 200710075475.7 discloses a kind of IXPE electron radiations crosslinked polyethylene
Conducting foam and preparation method thereof.The composition of the IXPE electron radiations crosslinking polyethylene conductive foam gathers including major ingredient low-density
Ethene, auxiliary material ethylene-vinyl acetate copolymer, azodicarbonamide foaming agent, Tissuemat E lubricating auxiliary agent, titanate esters coupling
Agent and conductive black, processed by batch mixing, extrusion molding, crosslinking with radiation, the technique such as foamable and secondary operation produce
IXPE electron radiation crosslinking polyethylene conductive foams.The invention product uniform foam cell is fine and closely woven, material surface is superior in quality, adds
Work is functional, but conductive black addition is up to 4.5%-5.5% or 6.5%-7.5%, does not improve its dispersiveness and resistivity,
The conduction and mechanical performance of material can be influenceed.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of preparation method of crosslinking polyethylene conductive expanded material, institute
The dispersiveness that preparation method is effectively improved conductive black is stated, reduces its dosage, obtained product has good conduction
And mechanical performance, production efficiency is high, and surface is smooth, asepsis environment-protecting.
To reach above-mentioned purpose, the concrete technical scheme that the present invention uses is as follows：
A kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：
（1）The azodicarbonamide, conductive black, toughness reinforcing of diluted formulations amount are distinguished with a part of low density polyethylene (LDPE) of formula ratio
Agent, antioxidant, lubricant, colouring agent, pass through double screw extruder extruding pelletization respectively；
（2）With the remainder low density polyethylene (LDPE) and step of formula ratio（1）Make pellet well mixed；
（3）By step（2）The material mixed, sheet material is extruded into through single screw extrusion machine；
（4）Sheet material passes through high-energy electron irradiation crosslinking Treatment；
（5）By step（4）Sheet material by foam process foam, obtain finished sheet；
The composition of raw materials for preparing the crosslinking polyethylene conductive expanded material is as follows：
By weight percentage include 2~15% azodicarbonamides, 0.1~0.5% conductive black, 2~5% toughener, 0.1~
2% antioxidant, 0.1~1% lubricant, the low density polyethylene (LDPE) of 2~5% colouring agents and surplus, each component content sum are
100%。
Preferably, the percentage by weight 7~12% of the azodicarbonamide.
Preferably, step（1）The mass ratio of the low density polyethylene (LDPE) and conductive black for diluting conductive black exists
（4~5.5）：1, low density polyethylene (LDPE) exists with azodicarbonamide, toughener, antioxidant, lubricant, the mass ratio of colouring agent
（1.5~2）：1.
Preferably, the antioxidant is DSTDP or antioxidant 1010, and the lubricant is zinc stearate, the colouring agent
For color masterbatch 1398, the toughener is calcium carbonate.
Preferably, step（1）110~150 DEG C of the Twin screw extruder extrusion temperature.
Preferably, step（3）The process conditions of the single screw extruder are：One 150~160 DEG C of area's temperature, two area's temperature
140~150 DEG C of degree, three 120~130 DEG C of area's temperature, four 110~120 DEG C of area's temperature, five 100~110 DEG C of area's temperature, six area's temperature
100~110 DEG C of degree, seven 95~100 DEG C of area's temperature, 110~120 DEG C of die head temperature, material extruder time of delivery for 2~
5min。
Beneficial effects of the present invention are as follows：
1st, conductive black is due to an especially strong interparticle cohesion, it is easy to forms polymer, therefore is difficult in the plastic
Scattered, the present invention solves this problem by the way of substep mixing granulation, first dilutes conductive charcoal with part low density polyethylene (LDPE)
It is black, by double screw extruder extruding pelletization, during this in the presence of powerful mechanical shear stress conductive black low
Uniform good disperse is obtained in density polyethylene melt.Because a large amount of micropores, while low density polyethylene (LDPE) be present in carbon blacksurface
In molten condition, both are more easy to combine, it is not necessary to extra to add coupling agent to improve its compatibility.Remaining formyl of raw material azo two
Amine, toughener, antioxidant, lubricant and colouring agent are also granulated in the same way so that each raw material is each dispersed in advance
In major ingredient low density polyethylene (LDPE), it is secondary mixing, extrusion in flakes during further complete it is dispersed, between raw material mutually
Disturb small, reduce secondary mixing difficulty, improve sheet quality.Compared with batch mixing, an extrusion molding of routine, the present invention is dividing
Dissipate and be greatly improved in property, and conductive black and other auxiliary agents only need seldom amount just can fully realize its function.
2nd, melt viscosity is relatively low after high-energy electron irradiation crosslinking overcomes polyethylene to melt after extrusion is in blocks, intermolecular work
Firmly small, decomposition gas is not easy to be maintained at the defects of resin during foaming, and compared with chemical crosslinking, asepsis environment-protecting, process is easy to
Control, and the uniformity of product will not be destroyed；The lubricant stearic acid zinc that the present invention uses, it can not only reduce between each raw material
Frictional resistance, the decomposition temperature of foaming agent azodicarbonamide can also be reduced, steadily can form abscess by fast decoupled.
Therefore, foaming effect is good, each auxiliary agent（Toughener, antioxidant, lubricant）Uniform and stable distribution so that material has excellent
Surface property and mechanical performance.
To sum up, fine and smooth uniform, the resistivity stabilization of finished sheet abscess, the conduction obtained by preparation method of the present invention
Property it is good, high mechanical strength, surface quality are good, processing characteristics is good.
Embodiment
With reference to embodiment, the invention will be further described.
Embodiment 1
A kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：（1）Weigh 5% azodicarbonamide,
0.1% conductive black, 2% calcium carbonate, 0.1% antioxidant 1010,0.1% zinc stearate and 2% color masterbatch 1398, use low density polyethylene (LDPE)
Dilute respectively, the dosage of low density polyethylene (LDPE) is corresponding in turn to as 10%, 0.5%, 4%, 0.2%, 0.15%, 3%, passes through twin-screw extrusion
Machine extruding pelletization, 110 DEG C of double screw extruder extrusion temperature；（2）Weigh 72.85% low density polyethylene (LDPE) and step（1）It is made
Particle is well mixed；（3）The material that will be mixed, it is extruded into sheet material through single screw extrusion machine and winds, single screw extrusion machine
Process conditions are：One 150 DEG C of area's temperature, two 140 DEG C of area's temperature, three 120 DEG C of area's temperature, four 110 DEG C of area's temperature, five area's temperature
100 DEG C, six 100 DEG C of area's temperature, seven 95 DEG C of area's temperature, 110 DEG C of die head temperature, material is 2min in the time of delivery of extruder；
（4）Sheet material passes through high-energy electron irradiation crosslinking Treatment；（5）Sheet material after radiation treatment is foamed by foam process, obtained into
Product sheet material.
Embodiment 2
A kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：（1）Weigh 7% azodicarbonamide,
0.2% conductive black, 2.5% calcium carbonate, 0.5% antioxidant 1010,0.5% zinc stearate and 2% color masterbatch 1398, use low density polyethylene
Alkene is diluted respectively, and the dosage of low density polyethylene (LDPE) is corresponding in turn to as 11.2%, 1%, 3.75%, 0.8%, 0.75%, 3%, passes through double spiral shells
Bar extruder extruding pelletization, 120 DEG C of double screw extruder extrusion temperature；（2）Weigh 66.8% low density polyethylene (LDPE) and step
（1）Make pellet well mixed；（3）The material that will be mixed, it is extruded into sheet material through single screw extrusion machine and winds, single screw rod is squeezed
The process conditions for going out machine are：One 150 DEG C of area's temperature, two 145 DEG C of area's temperature, three 120 DEG C of area's temperature, four 105 DEG C of area's temperature, 5th area
100 DEG C of temperature, six 100 DEG C of area's temperature, seven 95 DEG C of area's temperature, 110 DEG C of die head temperature, material are in the time of delivery of extruder
2min；（4）Sheet material passes through high-energy electron irradiation crosslinking Treatment；（5）Sheet material after radiation treatment is foamed by foam process, obtained
To finished sheet.
Embodiment 3
A kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：（1）Weigh 10% azodicarbonamide,
0.3% conductive black, 2.8% calcium carbonate, 1% antioxidant 1010,0.5% zinc stearate and 2.4% color masterbatch 1398, use low density polyethylene
Alkene is diluted respectively, and the dosage of low density polyethylene (LDPE) is corresponding in turn to as 15%, 1.5%, 4.2%, 1.6%, 0.8%, 3.6%, passes through double spiral shells
Bar extruder extruding pelletization, 120 DEG C of double screw extruder extrusion temperature；（2）Weigh 56.3% low density polyethylene (LDPE) and step
（1）Make pellet well mixed；（3）The material that will be mixed, it is extruded into sheet material through single screw extrusion machine and winds, single screw rod is squeezed
The process conditions for going out machine are：One 155 DEG C of area's temperature, two 145 DEG C of area's temperature, three 125 DEG C of area's temperature, four 110 DEG C of area's temperature, 5th area
105 DEG C of temperature, six 100 DEG C of area's temperature, seven 98 DEG C of area's temperature, 110 DEG C of die head temperature, material are in the time of delivery of extruder
3min；（4）Sheet material passes through high-energy electron irradiation crosslinking Treatment；（5）Sheet material after radiation treatment is foamed by foam process, obtained
To finished sheet.
Embodiment 4
A kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：（1）Weigh 12% azodicarbonamide,
0.4% conductive black, 3% calcium carbonate, the DSTDP of 1.5% antioxidant, 0.8% zinc stearate and 3% color masterbatch 1398, use low density polyethylene
Alkene is diluted respectively, and the dosage of low density polyethylene (LDPE) is corresponding in turn to as 18%, 2%, 6%, 2.7%, 1.6%, 4.8%, is squeezed by twin-screw
Go out machine extruding pelletization, 140 DEG C of double screw extruder extrusion temperature；（2）Weigh 44.2% low density polyethylene (LDPE) and step（1）Institute
Pelleting is well mixed；（3）The material that will be mixed, it is extruded into sheet material through single screw extrusion machine and winds, single screw extrusion machine
Process conditions be：One 160 DEG C of area's temperature, two 148 DEG C of area's temperature, three 125 DEG C of area's temperature, four 120 DEG C of area's temperature, five area's temperature
105 DEG C, six 105 DEG C of area's temperature, seven 100 DEG C of area's temperature, 115 DEG C of die head temperature, raw material is 4min in the time of delivery of extruder；
（4）Sheet material passes through high-energy electron irradiation crosslinking Treatment；（5）Sheet material after radiation treatment is foamed by foam process, obtained into
Product sheet material.
Embodiment 5
A kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：（1）Weigh 15% azodicarbonamide,
0.5% conductive black, 5% calcium carbonate, 2% antioxidant DSTDP, 1% zinc stearate and 4% color masterbatch 1398, are distinguished with low density polyethylene (LDPE)
Dilution, the dosage of low density polyethylene (LDPE) are corresponding in turn to as 22.5%, 2%, 7.5%, 3%, 1.5%, 6%, squeezed by double screw extruder
Go out to be granulated, 150 DEG C of double screw extruder extrusion temperature；（2）The azo two for weighing 30% low density polyethylene (LDPE) and having diluted
Formamide, conductive black, calcium carbonate, antioxidant DSTDP, calcium stearate, color masterbatch 1398 are well mixed with mixer；（3）Will be mixed
The material got togather, it is extruded into sheet material through single screw extrusion machine and winds, the process conditions of single screw extrusion machine is：One area's temperature
160 DEG C, two 150 DEG C of area's temperature, three 130 DEG C of area's temperature, four 120 DEG C of area's temperature, five 110 DEG C of area's temperature, six 110 DEG C of area's temperature,
Seven 100 DEG C of area's temperature, 120 DEG C of die head temperature, material are 5min in the time of delivery of extruder；（4）Sheet material passes through high energy electron
Cross-linking radiation processing；（5）Sheet material after radiation treatment is foamed by foam process, obtains finished sheet.
Above-described embodiment products obtained therefrom performance parameter is as follows：
In summary, the product that the preparation method of crosslinking polyethylene conductive expanded material of the present invention obtains has good
Conductive and mechanical performance.
Embodiment described above is only explanation of the invention, is not limitation of the present invention, people in the art
The equivalent transformation and modification that member makes according to the present invention, belong to protection scope of the present invention.
Claims (6)
1. a kind of preparation method of crosslinking polyethylene conductive expanded material, comprises the following steps：
（1）The azodicarbonamide, conductive black, toughness reinforcing of diluted formulations amount are distinguished with a part of low density polyethylene (LDPE) of formula ratio
Agent, antioxidant, lubricant, colouring agent, pass through double screw extruder extruding pelletization respectively；
（2）With the remainder low density polyethylene (LDPE) and step of formula ratio（1）Make pellet well mixed；
（3）By step（2）The material mixed, sheet material is extruded into through single screw extrusion machine；
（4）Sheet material passes through high-energy electron irradiation crosslinking Treatment；
（5）By step（4）Sheet material by foam process foam, obtain finished sheet；
The composition of raw materials for preparing the crosslinking polyethylene conductive expanded material is as follows：
By weight percentage include 2~15% azodicarbonamides, 0.1~0.5% conductive black, 2~5% toughener, 0.1~
2% antioxidant, 0.1~1% lubricant, the low density polyethylene (LDPE) of 2~5% colouring agents and surplus, each component content sum are
100%。
2. the preparation method of crosslinking polyethylene conductive expanded material according to claim 1, it is characterised in that：The azo
The percentage by weight 7~12% of diformamide.
3. the preparation method of crosslinking polyethylene conductive expanded material according to claim 1, it is characterised in that：Step（1）
The mass ratio of the low density polyethylene (LDPE) and conductive black for diluting conductive black exists（4~5.5）：1, low density polyethylene (LDPE)
Exist with the mass ratio of azodicarbonamide, toughener, antioxidant, lubricant, colouring agent（1.5~2）:1.
4. the preparation method of crosslinking polyethylene conductive expanded material according to claim 1, it is characterised in that：The antioxygen
Agent is DSTDP or antioxidant 1010, and the lubricant is zinc stearate, and the colouring agent is color masterbatch 1398, and the toughener is
Calcium carbonate.
5. the preparation method of crosslinking polyethylene conductive expanded material according to claim 1, it is characterised in that：Step（1）
The double screw extruder extrusion temperature is 110~150 DEG C.
6. the preparation method of crosslinking polyethylene conductive expanded material according to claim 1, it is characterised in that：Step（3）
The process conditions of the single screw extrusion machine are：One 150~160 DEG C of area's temperature, two 140~150 DEG C of area's temperature, three area's temperature
120~130 DEG C, four 110~120 DEG C of area's temperature, five 100~110 DEG C of area's temperature, six 100~110 DEG C of area's temperature, seven area's temperature
95~100 DEG C, 110~120 DEG C of die head temperature, material is 2~5min in the time of delivery of extruder.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109181066A (en) * | 2018-08-20 | 2019-01-11 | 湖北祥源新材科技股份有限公司 | A kind of high rebound polyethylene filling particle, application and its processing method |
| CN111518328A (en) * | 2020-04-24 | 2020-08-11 | 浙江润阳新材料科技股份有限公司 | One-step formed antistatic IXPE and preparation method thereof |
| CN111592706A (en) * | 2020-05-29 | 2020-08-28 | 深圳市长园特发科技有限公司 | Radiation crosslinking polyethylene foam and preparation method and application thereof |
| CN111635582A (en) * | 2020-05-29 | 2020-09-08 | 四川省宏源防水工程有限公司 | Antistatic polyethylene closed-cell foam board and preparation method thereof |
| CN111808352A (en) * | 2020-07-30 | 2020-10-23 | 浙江润阳新材料科技股份有限公司 | Radiation cross-linked polyethylene high-conductivity foam |
| CN115572429A (en) * | 2022-10-13 | 2023-01-06 | 深圳市盛林纸品包装有限公司 | Permanent antistatic composite material |
| RU2790692C1 (en) * | 2022-04-20 | 2023-02-28 | Акционерное общество "Ижевский Завод Пластмасс" | Method of manufacture of foamed cross-linked polyethylene or ethylene copolymers |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109181066A (en) * | 2018-08-20 | 2019-01-11 | 湖北祥源新材科技股份有限公司 | A kind of high rebound polyethylene filling particle, application and its processing method |
| CN111518328A (en) * | 2020-04-24 | 2020-08-11 | 浙江润阳新材料科技股份有限公司 | One-step formed antistatic IXPE and preparation method thereof |
| CN111592706A (en) * | 2020-05-29 | 2020-08-28 | 深圳市长园特发科技有限公司 | Radiation crosslinking polyethylene foam and preparation method and application thereof |
| CN111635582A (en) * | 2020-05-29 | 2020-09-08 | 四川省宏源防水工程有限公司 | Antistatic polyethylene closed-cell foam board and preparation method thereof |
| CN111808352A (en) * | 2020-07-30 | 2020-10-23 | 浙江润阳新材料科技股份有限公司 | Radiation cross-linked polyethylene high-conductivity foam |
| RU2790692C1 (en) * | 2022-04-20 | 2023-02-28 | Акционерное общество "Ижевский Завод Пластмасс" | Method of manufacture of foamed cross-linked polyethylene or ethylene copolymers |
| CN115572429A (en) * | 2022-10-13 | 2023-01-06 | 深圳市盛林纸品包装有限公司 | Permanent antistatic composite material |
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Application publication date: 20180119 |