CN1034937A - Sliced moulded plastics for explosion-proof products - Google Patents
Sliced moulded plastics for explosion-proof products Download PDFInfo
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- CN1034937A CN1034937A CN 89105451 CN89105451A CN1034937A CN 1034937 A CN1034937 A CN 1034937A CN 89105451 CN89105451 CN 89105451 CN 89105451 A CN89105451 A CN 89105451A CN 1034937 A CN1034937 A CN 1034937A
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- explosion
- unsaturated polyester
- extinguishing
- self
- proof
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Abstract
The invention relates to sliced moulded plastics for explosion-proof products.The unsaturated polyester resin of the self-extinguishing of the m-phthalic acid type that the external resin that uses is a Heat stability is good, not supply on this resin domestic market.The present invention selects the unsaturated polyester resins for general purpose of non-self-extinguishing for use, adds halogen compounds or boron compound and polystyrene additive simultaneously, and the content of Graphite Powder 99 is reduced to below 15%.Explosion-proof sheet molding compound of the present invention after tested, surface resistivity is 10
6～10
9Ω, flexural strength 〉=1700kg/cm
2, shock strength 〉=70kg-cm/cm
2, heat-drawn wire is greater than 200 ℃, self-extinguishing adopts the horizontal firing method below 10 seconds, through probationary certificate, can be under 135 ℃ of conditions life-time service.
Description
The invention belongs to the glass filament reinforced plastics field, or rather, relate to anti-goods sheet molding compound, also can be described as explosion-proof sheet molding compound (being explosion-proof SMC).
All there is a large amount of explosive atmospheres that contains in industry such as oil, coal, chemical industry, medical pharmacy.For example, under normal coal mine, except biogas, also have other inflammable gass or steam, in the oil field, a large amount of volatile, inflammable, explosive hydrocarbon polymers is arranged, many explosive hydrogen or oxygen gas workshop is also arranged in pharmaceutical industry ...For the sake of security, strict rules have all been worked out to the used electric installation of these explosive atmospheres in countries in the world.
Past, in these explosive atmospheres, generally use the flameproof electrical apparatus of metal shell, it is big to exist weight, easy-to-rust, collision easily produces spark and uneasy congruent a series of disadvantages; And general thermoplastics is used for antiknock device, explosion-proof products, exist again intensity low, easily produce static, shortcoming such as inflammable, explosive, be not suitable for doing the device housings of explosive atmosphere.
To late nineteen seventies, early eighties, the electrical apparatus for explosive atmospheres shell of being made by explosion-proof sheet molding compound (being explosion-proof SMC) is brought into use in West Europe.It has antistatic, difficult combustion, intensity height, Heat stability is good, in light weight, not corrosion, production efficiency advantages of higher, the easy stdn of the electric product of manufacturing, seriation.But countries in the world also are not used widely, and major cause is that raw-material prescription is complicated, processing performance is poor.The resin that external explosion-proof SMC uses is the unsaturated polyester resin of self-extinguishing of the m-phthalic acid type of Heat stability is good.And it is quite strict to the requirement of molecular weight; In order to reach surface resistivity 10
6～10
9Semiconducting behavior, to add 30% graphite usually; Also comprise other components simultaneously, as thickening material, solidifying agent, filler, remover, tinting material etc.
At present, the domestic electrical apparatus for explosive atmospheres shell of being made by explosion-proof SMC does not also occur.Aspect starting material, in order to reach self-extinguishing, it has been generally acknowledged that and need to use self-extinguishing resin, but the self-extinguishing resin of domestic production at present can not thickening, can not be directly used in explosion-proof SMC.In addition, also do not have thermostability good on the domestic market, therefore the unsaturated polyester resin of electroconductibility, can not satisfy 10 of explosion-proof SMC requirement
6～10
9The surface resistivity of Ω.
The objective of the invention is to, utilize China general, it has been generally acknowledged that the starting material that are difficult to reach explosion-proof performance,, make it possess following characteristics by adding other components, make the explosion-proof SMC that satisfies explosion--proof regulations.
1, surface resistivity is 10
6～10
9;
2, has good self-extinguishing;
3, heat-drawn wire is greater than 200 ℃.
Explosion-proof sheet molding compound of the present invention (being explosion-proof SMC) uses the unsaturated polyester resin of the adjacent benzene of general non-self-extinguishing or m-phthalic acid type as matrix, add simultaneously antimonous oxide-halogen compounds or-the boron compound system, to reach self-extinguishing; For the heat-drawn wire that makes the SMC that makes greater than 180 ℃, in resin system, adopt the high polystyrene of thermotolerance as the low-shrinkage additive; In order to reach surface resistivity 10
6～10
9Ω, it has been generally acknowledged that needs to add 30% Graphite Powder 99, and the present invention only need add 3～15% Graphite Powder 99.
The making of explosion-proof SMC of the present invention is: components such as unsaturated polyester resin, filler, mineral compound, remover, tinting material, solidifying agent, thickening material is mixing, resulting mixture is uniformly dispersed, sized glass fibres or its goods then, thus half viscosity plate-shaped sheet molding compound formed; The moulding elbow only needs the barrier film on this material two sides is torn off, by 50～80% big or small cuttings of product area, laminatedly put into warmed-up metal die then, makes its curing more than the pressurization some minutes, promptly gets desired product.Thereby, convenient formation, the production efficiency height, product's dimensional precision is good, and the easy stdn of product, seriation are suitable for producing in enormous quantities.
Explosion-proof sheet molding compound of the present invention (table one) composed as follows
Component each component per-cent is formed (weight %)
Adjacent benzene or m-phthalic acid unsaturated 100
Vibrin
Graphite Powder 99 3～15
Antimonous oxide 4～10
Halogen compounds 3～10
Boron compound 3～20
Alkaline earth metal oxide or oxyhydroxide 0～5
Polystyrene additive 2～50
T-butylperoxyl benzoate 0.5～1
Peralcohol 0～1
Short glass fiber or its goods 70～100
Following filler choose any one kind of them or some kinds an amount of
Lime carbonate, hydrated aluminum oxide, china clay in powder, talcum powder
The explosion-proof SMC of the present invention after tested, probationary certificate, satisfy the explosion-proof performance requirement fully, meet the requirement of electrical apparatus for explosive atmospheres specification fully, can be under 135 ℃ of conditions life-time service.The explosion-proof SMC specific performance of the present invention data see Table two.
Table two, explosion-proof SMC technical feature data
Project testing is unit as a result
Surface resistivity 10
6～10
9Ω
Flexural strength 〉=1700 kg/cm
2
Shock strength 〉=60 kg-cm/cm
2
Heat-drawn wire＞200 ℃
Self-extinguishing horizontal firing method is below 10 seconds
Embodiment one:
Explosion-proof with SMC material group component unit (part)
198# unsaturated polyester resin 100
T-butylperoxyl benzoate 1
Antimonous oxide 10
Clorafin 5
Zinic stearas 2
W 4600 30
China clay 35
Graphite 10
Magnesium oxide 1
Polystyrene additive 20
With above-mentioned mixing of materials evenly after, be coated on two polyethylene films, 100 parts of short glass fibers are clipped in the middle.In two sheetmetal rollers, push then, make the good impregnated glass fiber of resin paste, make the SMC blank, slaking at room temperature a day, tearable thin film, press 50～80% big or small cuttings of product shadow area after, be placed in the mould, at 35kg/cm
2, compression molding under 130 ℃～160 ℃ conditions.
Gained SMC product properties is as follows:
Surface resistivity 10
6～10
9Ω
Flexural strength 1700kg/cm
2
Shock strength 70kg-cm/cm
2
Self-extinguishing energy horizontal firing method is below 10 seconds
Heat-drawn wire is greater than 200 ℃
Can be at 135 ℃ of following life-time service.
Embodiment two:
An explosion-proof SMC material component unit (part)
S-818 unsaturated polyester resin 100
The peroxidation tert-butyl ester 0.8
Benzoyl peroxide 0.2
Antimonous oxide 5
Decabromodiphynly oxide 20
Zinic stearas 2
Graphite 10
Magnesium oxide 0.1
Calcium oxide 0.1
Polystyrene additive 40
After above-mentioned mixing of materials, remove on two polyethylene films, 100 parts of short glass fibers are clipped in the middle, in two steel riders, push then, make the good impregnated glass fiber of resin paste, make the SMC blank, and slaking at room temperature a day, tearable thin film, press 50～80% big or small cuttings of product shadow area superimposed after, be placed in the mould, at 500kg/cm
2, 140 ℃ of following compression moldings.The explosion-proof SMC product properties of gained is as follows:
Surface resistivity 10
6～10
9Ω
Flexural strength 1700kg/cm
2
Shock strength 70kg-cm/cm
2
Self-extinguishing energy horizontal firing method is below 10 seconds
Heat-drawn wire is greater than 200 ℃
Can be at 135 ℃ of following life-time service.
The embodiment of the invention described above mainly is for to purpose of the present invention with constitute and further to be illustrated, the implementer is more readily understood and implements, and in no case be restriction the present invention.Therefore, should it is apparent that those well-trained personnel in the present technique field, can be to the basic resin in the mixture of the present invention, select for use and the scope of tinting material, thickening material, filler and other components are made various improvement, and do not depart from spirit of the present invention.
Claims (3)
1, a kind of sliced moulded plastics for explosion-proof products is characterized in that:
A. matrix resin adopts the unsaturated polyester resins for general purpose of non-self-extinguishing;
B. contain halogen compounds and boron compound;
C. contain the polystyrene additive;
D. the content of general Graphite Powder 99 is less than 1 15;
Satisfy following three conditions simultaneously:
-horizontal firing the method for putting out certainly is below 10 seconds,
-heat-drawn wire is greater than 200 ℃,
-surface resistivity 10
6～10
9Ω.
According to the described sheet molding compound of claim 1, it is characterized in that 2, the composition of sheet molding compound (weight %) is:
Unsaturated polyester resin 100
Graphite Powder 99 3～15
Antimonous oxide 4～10
Halogen compounds 3～20
Boron compound 3～20
Alkaline earth metal oxide or oxyhydroxide 0～5
Magnesium oxide 0.1～2
Polystyrene additive 2～50
T-butylperoxyl benzoate 0.5～1
Superoxide 0～1
Short glass fiber or its goods 76～100
Following filler is chosen any one kind of them:
Lime carbonate, hydrated aluminum oxide, china clay in powder, talcum powder are an amount of.
3, according to the described sheet molding compound of claim 2, it is characterized in that, select for use O-phthalic acid type or m-phthalic acid type unsaturated polyester resin for best.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105451 CN1034937A (en) | 1988-12-26 | 1988-12-26 | Sliced moulded plastics for explosion-proof products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105451 CN1034937A (en) | 1988-12-26 | 1988-12-26 | Sliced moulded plastics for explosion-proof products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1034937A true CN1034937A (en) | 1989-08-23 |
Family
ID=4856205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89105451 Pending CN1034937A (en) | 1988-12-26 | 1988-12-26 | Sliced moulded plastics for explosion-proof products |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034937A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103613715A (en) * | 2013-07-02 | 2014-03-05 | 大连当代兴达发展有限公司 | Sheet molding compound with high stability and high uniformity and preparation method therefor |
-
1988
- 1988-12-26 CN CN 89105451 patent/CN1034937A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103613715A (en) * | 2013-07-02 | 2014-03-05 | 大连当代兴达发展有限公司 | Sheet molding compound with high stability and high uniformity and preparation method therefor |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |