CN101259741B - Method for preparing antistatic high foaming material - Google Patents

Method for preparing antistatic high foaming material Download PDF

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CN101259741B
CN101259741B CN2007100867187A CN200710086718A CN101259741B CN 101259741 B CN101259741 B CN 101259741B CN 2007100867187 A CN2007100867187 A CN 2007100867187A CN 200710086718 A CN200710086718 A CN 200710086718A CN 101259741 B CN101259741 B CN 101259741B
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foaming
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antistatic high
foaming material
antistatic
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CN101259741A (en
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李文生
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EVA-GLORY INDUSTRIAL Co Ltd
Eva Glory Ind Co Ltd
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EVA-GLORY INDUSTRIAL Co Ltd
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Abstract

The invention discloses a preparation method of antistatic high foam material, consisting of the following steps: a foaming substrate, a conductive soot carbon and an additive component are provided and mixed for compounding and then a initial blank is injected and formed; the initial blank is arranged in a first foaming and molding mould to have a first coining and foaming and obtain a first foaming body; then, the first foaming body is arranged in a second foaming and molding mould to have a second coining and foaming to form a second foaming body, and the second foaming body is kept in the mould to be cooled, thus obtaining the antistatic high foam material. Through twice of coining and a cooling process in the mould, the produced finished product possesses a low density and a good antistatic property. Therefore, the preparation method of the invention has the characteristics of further improving the quality of the antistatic high foam material product.

Description

The method for making of antistatic high foaming material
Technical field
The present invention relates to a kind of method for making of the material that foams, particularly relate to a kind of method for making of antistatic high foaming material.
Background technology
Generally at packing electronic motor part or have the instrument of described part or during device; employed packing timber except wanting light weight in order to avoid increase the transportation burden; and to provide outside the protection coating that can enough cushion shock-absorbing; cause described electronic motor part impaired for fear of packing timber accumulation static; therefore; must use and have high buffering concurrently; can make electrostatic dissipation; and Electromagnetic Interference (Electro Magnetic Imterfering arranged; abbreviating EMI as) material that characteristic such as covers makes packing timber; wherein, the antistatic foam material through the foaming technique foaming is exactly the packing timber that generally is used in the electronic industry.
Consult Fig. 1, the method for making of existing a kind of antistatic foam material includes the following step:
Step 101 with the base material of predetermined ratio (for example is, ethene-vinyl acetate copolymer (EVA) or polyethylene (PE)), conductive carbon black and other add auxiliary agent and insert the mixing stirring of a mixer together, and through a film-discharging machine spreading make with extrusion molding be a master slice sheet material.
Step 102 is that this master slice sheet material is placed in the foaming molding mold, and at 140kg/cm 2160kg/cm 2Foamed moulded, and carry out moulded from foam under 165 ℃～170 ℃ the blowing temperature.
Step 103 is that the foaming finished product that foaming is finished is taken out from this mould.
Step 104 is to make this foaming finished product be cooled to a proper temperature, just can be used as an antistatic foam material and uses, and prepared this antistatic foam material generally is to have 10 610 9The volume resistance of Ω-cm, and greater than 0.1g/cm 3Density.
Though can provide the suitable antistatic effect and the packing character of available buffer shock-absorbing by the prepared antistatic foam material of said method, in fact still have following disappearance:
One, higher relatively (limitations in density is at 0.1g/cm for the density of existing prepared this antistatic foam material of method for making 3More than), make the quality of prepared this antistatic foam material also heavier, except employed raw material is more relatively, also be easier to increase packed weight and become burden in the transportation, if desire is used as added alternate manners such as interfacial agent or blowing agent, the density of this foaming material is reduced to less than 0.1g/cm 3Scope, during then because of the foaming body depanning, all decomposition gas abrupt releases, make foaming body generation instantaneous expansion, the fierce expansion causes the foaming body broken hole easily and tears phenomenon, have the situation that the broken hole fraction defective increases, can cause raw-material waste equally, make existing method for making that the higher and lower disappearance of economic benefit of product fraction defective be arranged.
Two, general antistatic products can be divided into Three Estate according to its different volume resistance value, is respectively: (a) conduction level (conductive): volume resistance is 10 4～10 6The scope of Ω-cm, (b) electrostatic dissipation level (Electric StaticDissipative): volume resistance is 10 6～10 8The scope of Ω-cm, (c) antistatic-level (Anti-static): volume resistance is 10 9～10 12The scope of Ω-cm, wherein, the conduction level is the grade of antistatic effect the best, according to aforesaid criteria for classification, the volume resistance of the obtained foaming material of this existing method for making is 10 6～10 9Ω-cm shows that its antistatic grade the best can only reach the electrostatic dissipation level, has the not good shortcoming of antistatic effect relatively.
Summary of the invention
The objective of the invention is is providing a kind of method for making that can make the antistatic high foaming material of the foaming material with preferable antistatic grade and less material density.
So the method for making of antistatic high foaming material of the present invention includes the following step:
One, mixing extrusion provides a foamed substrate, a conductive carbon black and an additive component to mix stirring mutually, and after mixing under the predetermined temperature, and extrusion forms a first idiosome, and wherein, this additive component comprises dispersant, blowing agent, bridging agent and blowing promotor;
Two, one-step mould foaming, just idiosome is inserted in one first foaming molding mold, at pressure 125kg/cm 2～170kg/cm 2Foam to make one first foaming body with 140 ℃～155 ℃ compacted unders of temperature;
Three, secondary mould pressing foaming is taken out this first foaming body, and is inserted in one second foaming molding mold in this first foaming molding mold, in normal pressure and 152 ℃～158 ℃ compacted under foaming of temperature, to make one second foaming body;
Four, cooling in the mould stopped 30～50 minutes this second foaming body, to cool and to make this second foaming body be cooled to 30～80 ℃ in this second foaming molding mold;
Five, make finished product, this second foaming body is after cooling is handled, and this second foaming molding mold takes out certainly, and forming a density is 0.04g/cm 3～0.09g/cm 3, and volume resistance is 10 5Ω-cm～10 9The antistatic high foaming material of Ω-cm.
Beneficial effect of the present invention is: see through above-mentioned method for making, through the secondary mould pressing foaming, and after in mould, cooling off, just can make that to have preferable buffering shockproof, and can effectively eliminate the finished product of the material characteristic of static, high-antistatic and low-density high foaming material that formation is better than general antistatic foam material effect, and then can provide splendid packing protection effect to electronic component, make the present invention have the advantage that can make the preferable antistatic high foaming material of quality.
Description of drawings
Fig. 1 is a flow chart of the method for making of existing antistatic foam material;
Fig. 2 is a flow chart of method for making one preferred embodiment of antistatic high foaming material of the present invention.
The specific embodiment
The present invention is described in detail below in conjunction with embodiment:
Consult Fig. 2, this preferred embodiment of the method for making of antistatic high foaming material of the present invention is to comprise the following steps:
Step 201 is mixing extrusions, and a foamed substrate, a conductive carbon black and an additive component are provided, and after mixing stirring according to predetermined ratio mutually with a mixer, carries out mixingly under 100 ℃～130 ℃ temperature, forms a first idiosome through a film-discharging machine extrusion again.
Step 202 is one-step mould foaming, the prepared idiosome just of step 201 is inserted in one first foaming molding mold, and respectively pressure is set in 125kg/cm 2～170kg/cm 2Scope in, and temperature is set in 140 ℃～155 ℃ scope, to this just idiosome carry out the moulded from foam first time, foamed time is preferably 25～40 minutes, and makes one first foaming body.
Step 203 is secondary mould pressing foaming, this first foaming body is taken out in this first foaming molding mold, and insert in one second foaming molding mold, respectively pressure is set in atmospheric pressure state, and temperature is set in 152 ℃～158 ℃ scope, this first foaming body is carried out the moulded from foam second time, and foamed time is preferably 20～50 minutes, and makes one second foaming body.
Step 204 is coolings in the mould, this second foaming body still is retained in this second foaming molding mold, (for example cooperate specific cooling device and mode, with the cooling water endless form), make this second foaming body in 30～50 minutes the time interval, be reduced to 30 ℃～80 ℃ lower temperature from 152 ℃～158 ℃ high temperature.
Step 205 is to make finished product, and this second foaming body just can more stably take out in this second foaming molding mold, and form an antistatic high foaming material, and the density of this antistatic high foaming material is to be 0.04g/cm after cooling is handled 3～0.09g/cm 3, and volume resistance is 10 5Ω-cm～10 9Ω-cm.
What deserves to be explained is, foamed substrate used in step 201 can be according to practical application request, and be selected from thermoplastic elastomer (TPE) (Thermoplastic Elastomer, be called for short TPE), in addition, this foamed substrate also can be selected from the group that is made of following material: EVA, PE, with and the combination as raw material, this additive component then comprises dispersant, blowing agent, bridging agent and blowing promotor.Go into this conductive carbon black by blending, this foamed substrate is had can be antistatic and the function of conduction, cooperate the effect of different chemical composition in this additive component again, the foamed substrate that contains this conductive carbon black can be foamed smoothly form the foaming material finished product of tool preliminary dimension and external form.
When reality is made this foamed substrate, can select for use suitable one-tenth phase-splitting to mix according to the trimmed size that will make.The reference formulation of following table for cooperating method for making of the present invention to use, but method for making of the present invention should not be subjected to this formulation restrictions, in this prescription, also show the preferable content ratio of each composition, wherein, each composition can be selected to use, not necessarily to all use, can select for use according to desired trimmed size, though that is to say in each deal prescription has foamed substrate, conductive carbon black and additive component as basic composition, can select according to actual demand to use as the actual constituent of foamed substrate and additive component.
Reference formulation:
*Engage, DCP, AC-6, N-Znst, YC100, VG301 are the composition code name that general industry is used.
＜composition code name explanation 〉
Before the explanation of carrying out following concrete example and comparative example, substance classes and its source of each code name representative in composition of raw materials is described earlier:
Code name Composition Property description The source
EVA629 Ethene-vinyl acetate copolymer VA content (vinyl acetate content): 18 MI values (melt index): 2.5 fusing points: 89 ℃ Taiwan polymerization company
PE112 Low density polyethylene (LDPE) MI value: 3 fusing points: 108 ℃ Taiwan polymerization company
Engage Polyolefin elastomer (Polyolefin Elastomer) MI value: 1 proportion: 0.89 Dupont?DowElastomers
Conductive carbon black Carbon?Black Bulk Density (total body density): 20～550kg/m 3 Rise generation and reach trading company
DCP Bridging agent, cumyl peroxide (Dicumyl Peroxide) Outward appearance: the granular melting point of white crystals: 38 ℃ of half-life: 117 ℃/10hr With chemical company of association
AC-6 Blowing agent, Celogen Az (Azodicarbonamide) Outward appearance: yellow powder decomposition temperature: 204 ± 1 ℃ gas generated: 220 ± 10 ml/g particle diameters: 9～13 μ m Yonghe County, Taiwan changes into industrial group
N-ZnSt Blowing promotor, zinc stearate Zinc Stearate Outward appearance: white crystalline powder proportion: 1.09 melting points: 120 ± 5 ℃ With chemical company of association
ZnO Blowing promotor, zinc oxide Zinc oxide Outward appearance: white crystalline powder purity: more than 90% Lu Chang chemical company
YC100 Dispersing aid, the oil resin Outward appearance: white crystals particle The group is with scientific ﹠ technical corporation
VG301 Processing aid, trimethylol-propane trimethacrylate (trimethylolpropane trimethacrylate abbreviates TRIM as) -? The group is with scientific ﹠ technical corporation
Below make the concrete example of this foaming material with regard to three according to method for making of the present invention respectively, with a comparative example of making this foaming material according to existing method for making be example, the characteristic with finished product that method for making of the present invention is made be described, reach and the difference of comparative example.
[concrete example one (secondary mould pressing foaming)]
Figure S07186718720070314D000051
Melting temperature: 115 ℃
One-step mould pressure: 150kg/cm 2
One-step mould temperature: 150 ℃
Secondary mould pressing pressure: normal pressure
Secondary mould pressing temperature: 155 ℃
[concrete example two (secondary mould pressing foaming)]
Figure S07186718720070314D000061
Melting temperature: 120 ℃
One-step mould pressure: 150kg/cm 2
One-step mould temperature: 149 ℃
Secondary mould pressing pressure: normal pressure
Secondary mould pressing temperature: 155 ℃
[concrete example three (secondary mould pressing foaming)]
Melting temperature: 120 ℃
One-step mould pressure: 150kg/cm 2
One-step mould temperature: 151 ℃
Secondary mould pressing pressure: normal pressure
Secondary mould pressing temperature: 156 ℃
[comparative example (one-step mould foaming)]
Melting temperature: 115 ℃
One-step mould pressure: 150kg/cm 2
One-step mould temperature: 165～170 ℃
[result]
Above-mentioned concrete example one, two, three all passes through foregoing " mixing extrusion
Figure S07186718720070314D00007092425QIETU
The one-step mould foaming The secondary mould pressing foaming
Figure 2007100867187100002S07186718720070314D00007092531QIETU
Cooling in the mould
Figure 2007100867187100002S07186718720070314D00007092531QIETU
Finished product take out " method for making and make foaming material A, foaming material B and foaming material C respectively.This comparative example then is through " mixing extrusion
Figure 2007100867187100002S07186718720070314D00007092531QIETU
Moulded from foam
Figure 2007100867187100002S07186718720070314D00007092531QIETU
Finished product takes out
Figure 2007100867187100002S07186718720070314D00007092531QIETU
Cooling " method for making make foaming material D.Prepared foaming material A, B, C, D be again according to the standard method of CNS5341 and ASTM-D257-99, respectively with Specific gravity balanceWith MeggerMeasure its density and volume resistance value, the result is as follows:
Density and volume resistance measurement
Figure S07186718720070314D000071
According to measurement, can find out and utilize secondary mould pressing of the present invention to foam the density value of prepared foaming material A, B, C all less than 0.1g/cm 3, obviously the density than the existing prepared foaming material of one-step mould method for making D is little, and the volume resistance of foam material A, B, C all drops on 10 5～10 6In the scope of Ω-cm, also than 10 of foaming material D 6～10 7The volume resistance of Ω-cm is little, shows by method for making of the present invention to make the foaming material finished product with less density and low volume resistance value, makes this foaming material finished product that the highly characteristic of foaming be arranged, and can show preferable antistatic effect.
What deserves to be explained is, if in the processing procedure of comparative example (one-step mould foaming), in order to reduce density (promptly improving frothing percentage), and when blowing agent (being AC-6 in this prescription) consumption that uses brought up to 9～14 weight portions identical with formula range of the present invention, during then owing to this foaming material D depanning, all decomposition gases meeting abrupt releases, the volume of the volume that makes this foaming material D with respect in mould the time, instantaneous expansion reaches 10～20 times, fierce expansion will cause this foaming material D to produce broken hole and tear phenomenon, cause the foaming quality of this foaming material D bad on the contrary.Adopt the processing procedure of secondary mould pressing, just can be earlier by the one-step mould foaming material A that should foam, B, the size Control of C is suitable expanding volume multiplying power (being 3.5～6.5 times) in this preferred embodiment, material A again should foam, B, the C dislocation is gone into one second foaming molding mold, with further by the normal pressure and the foaming condition that is heated to 152 ℃～158 ℃ of secondary mould pressing foaming, make and remain in this foaming material A, B, gas in the C slowly disengages, and then make this foaming material A, B, the size of C also and then expand into gradually according to the designed size of prescription, therefore, see through secondary mould pressing processing procedure of the present invention and can increase this foaming material A, B, the frothing percentage of C, and the density of foaming material finished product is significantly reduced, simultaneously, can also foam by secondary mould pressing, avoid fierce foaming, to keep preferable foaming quality, make processing procedure of the present invention can make antistatic high foaming material really.
What deserves to be mentioned is that the foaming material finished product yield that method for making of the present invention is made can reach more than 95%, the material finished product density is reduced to less than 0.1g/cm foaming 3The time, the broken hole fraction defective can't significantly increase, and makes method for making of the present invention have the economic benefit that can be applied to manufacture really.
Can learn that via above explanation the method for making of antistatic high foaming material of the present invention can be obtained following effect and advantage, so really can reach purpose of the present invention:
One, relatively low (density can be controlled at 0.1g/cm through the density of prepared this antistatic high foaming material of secondary mould pressing foaming for method for making of the present invention3Below); make prepared foaming material end product quality also lighter, except the use amount that can reduce raw material, can also utilize the characteristic of high-foaming to reach the shockproof protection effect of buffering; and the loading in the minimizing transportation, make the present invention have the advantage that can highly foam with the conservation cost.
Two, the foaming material finished product made of method for making of the present invention is many 10 through measuring its resistance value5～10 6In the scope of Ω-cm, it is the degree of electrical conductivity that belongs to antistatic effect the best, show the process design that method for making of the present invention is cooled off in secondary mould pressing and the mould, except higher frothing percentage is arranged, can also make the foaming material with better antistatic property, make the present invention have can the improving product quality advantage.

Claims (6)

1. the method for making of an antistatic high foaming material, it is characterized in that: the method for making of this antistatic high foaming material includes the following step:
One, mixing extrusion provides a foamed substrate, a conductive carbon black and an additive component to mix stirring mutually, and after mixing under the predetermined temperature, and extrusion forms a first idiosome, and wherein, this additive component comprises dispersant, blowing agent, bridging agent and blowing promotor;
Two, one-step mould foaming, just idiosome is inserted in one first foaming molding mold, at pressure 125kg/cm 2～170kg/cm 2Foam to make one first foaming body with 140 ℃～155 ℃ compacted unders of temperature;
Three, secondary mould pressing foaming is taken out this first foaming body, and is inserted in one second foaming molding mold in this first foaming molding mold, in normal pressure and 152 ℃～158 ℃ compacted under foaming of temperature, to make one second foaming body;
Four, cooling in the mould stopped 30～50 minutes this second foaming body, to cool and to make this second foaming body be cooled to 30～80 ℃ in this second foaming molding mold;
Five, make finished product, this second foaming body is after cooling is handled, and this second foaming molding mold takes out certainly, and forming a density is 0.04g/cm 3～0.09g/cm 3, and volume resistance is 10 5Ω-cm～10 9The antistatic high foaming material of Ω-cm.
2. the method for making of antistatic high foaming material as claimed in claim 1 is characterized in that: this foamed substrate, conductive carbon black and the additive component in the step 1 be under 100 ℃～130 ℃ temperature, carry out mixing.
3. the method for making of antistatic high foaming material as claimed in claim 2 is characterized in that: the time that step 2 is carried out the one-step mould foaming is 25～40 minutes.
4. the method for making of antistatic high foaming material as claimed in claim 3 is characterized in that: the time that step 3 is carried out the secondary mould pressing foaming is 20～50 minutes.
5. the method for making of antistatic high foaming material as claimed in claim 1, it is characterized in that: this used in step 1 foamed substrate is to be selected from the group that is made of following: ethene-vinyl acetate copolymer, polyethylene, with and combination.
6. the method for making of antistatic high foaming material as claimed in claim 1, it is characterized in that: this used in step 1 foamed substrate is to be selected from thermoplastic elastomer (TPE).
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2017136941A1 (en) * 2016-02-09 2017-08-17 Bauer Hockey Ltd. Athletic gear or other devices comprising post-molded expandable components

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CN101870782B (en) * 2009-04-21 2012-05-30 陽新五龍興塑業高科技材料有限公司 Antistatic flame-retardant foam material and preparation method thereof
CN112157861B (en) * 2020-08-27 2022-11-08 茂泰(福建)鞋材有限公司 Preparation method of secondary mould pressing foaming sole
CN112171998B (en) * 2020-09-04 2021-09-07 湖南亚太实业有限公司 Process for manufacturing special-shaped foamed product
CN113977991B (en) * 2021-11-16 2024-05-24 山东恒源兵器科技股份有限公司 Carbon fiber wing inner foaming forming method

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WO2017136941A1 (en) * 2016-02-09 2017-08-17 Bauer Hockey Ltd. Athletic gear or other devices comprising post-molded expandable components

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