CN1113897C - Process for preparing special material by radiation technique for blow injection of car's fender guard - Google Patents
Process for preparing special material by radiation technique for blow injection of car's fender guard Download PDFInfo
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- CN1113897C CN1113897C CN 99117467 CN99117467A CN1113897C CN 1113897 C CN1113897 C CN 1113897C CN 99117467 CN99117467 CN 99117467 CN 99117467 A CN99117467 A CN 99117467A CN 1113897 C CN1113897 C CN 1113897C
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- Prior art keywords
- polyethylene
- extrusion
- blow molding
- bumper
- irradiated
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Abstract
The present invention relates to a method for preparing special-purpose materials for extrusion-blow molding automobile bumpers using an irradiation technology. After polyethylene is irradiated by gamma-rays or electron beams, polar groups containing oxygen can be introduced on molecule chains of the polyethylene, and when the polar groups containing oxygen are mixed with inorganic filling materials, such as sericite-tridymite-cristobalite powder, Mg(OH)2, CaCo3, wollastonite, etc., hydrogen bonding or other chemical reactions can occur, which enables interactions between interfaces to be improved and the mechanical property of systems to be enhanced. The materials can be used for preparing extrusion-blow molding automobile bumpers by optimizing the compounding ratios of the polyethylene, irradiated polyethylene, the sericite-tridymite-cristobalite powder, etc.
Description
The present invention relates to the polyolefinic new technology of a kind of preparation high-performance, belong to polymer processing field.
The forming technique of bumper mainly contains two kinds of injection moulding and extrusion and blow moldings.The car collision bumper generally adopts the material and the injection molding process of high workability, a kind of injection moulding material dedicated for bumper Keltan TP 0552/2 that for example Dutch DSM N. V. produced.Injection moulding machine and forming mould investment are big, and the product shock resistance is lower.Compare with injection moulding, the extrusion and blow molding technology has the following advantages:
1. collision bumper can be designed to the double walled hollow structure, and overlay is smooth smooth, and supporting layer can be designed to corrugated, makes product have higher rigidity and flexural strength.
2. positive layer does not exist the defectives such as the hole phenomenon of collapsing that materials flow fusion seam and stiffening web are caused, visual appearance height.
3. moulding process can under low pressure be carried out, and residualinternal stress is less, the shock resistance height.
4. facility investment is less, and mould structure is simple, makes easily.
Adopting the extrusion and blow molding technology to produce bumper must adopt low melt index (＜1g/10min) resin dedicated to guarantee that melt has enough tension force avoids parison the excessive sag phenomenon to occur in push.The polythene material that is suitable for the collision bumper of blow molding does not at present see that report is arranged.
The objective of the invention is at prior art open question and a kind of method that adopts irradiation technique to prepare the extrusion and blow molding material dedicated for bumper is provided still, being characterized in will be through the polyethylene and the mineral filler blend of irradiation, because the sub polyethylene subchain has been introduced into and has contained the oxygen polar group in the irradiation process, strengthened the interface compatibility of co-mixing system, the over-all properties of co-mixing system is improved.
Purpose of the present invention adopts following technical measures to realize that wherein said raw material umber is parts by weight except that specified otherwise.
1. the preparation of irradiated polyethylene
Adopt
60Co gamma-radiation source or electron electrostatic accelerator at room temperature carry out irradiation to polythene material in the air, and irradiation dose is 1～50kGy, introduce C=O isopolarity group on its molecular chain.
2. the preparation of extrusion and blow molding material dedicated for bumper
With 85～30 parts of polyethylene, 5～30 parts and 10～40 parts sericite-tridymite-cristobalites of irradiated polyethylene, Mg (OH)
2, CaCO
3And/or at least a in the wollastonite, adopting double-screw extruding pelletizing, each section temperature is respectively 100～110 ℃, 130～150 ℃, 170～190 ℃, 170～190 ℃, 170～185 ℃ of head temperatures.
Experimental result shows, the material dedicated for bumper that this method makes has good comprehensive performances, performances such as its notched Izod impact strength (particularly-40 ℃), yield strength, elongation at break, modulus in flexure, heat-drawn wire all are better than the present material dedicated for bumper salable of Dutch DSM N. V. (Keltan TP 0552/2) index, detailed being shown in Table 1.
The present invention has following advantage:
Technology is simple, cleaning, pollution-free, and the PP Pipe Compound that makes has excellent mechanical property, and cost is lower, can be applied aspect bumper.
Embodiment:
Below by embodiment the present invention is specifically described; be necessary to be pointed out that at this following examples only are used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment to the present invention according to the invention described above content.
1. adopt JJ-2 type electrostatic accelerator, at room temperature in the air polyethylene is carried out irradiation, irradiation dose is 40kGy.Again with 35 parts of polyethylene, 30 parts of irradiated polyethylenes and 35 parts of CaCO
3Use double-screw extruding pelletizing, each section temperature is respectively 110 ℃, 140 ℃, 190 ℃, 190 ℃, 185 ℃ of head temperatures.
2. adopt right cylinder formula 50000 Ci
60Irradiation is at room temperature carried out to polyethylene in the air in Co gamma-radiation source, and irradiation dose is 30Gy.With 45 parts of polyethylene, 25 parts of irradiated polyethylenes and 30 parts of sericite-tridymite-cristobalite double-screw extruding pelletizings, each section temperature is respectively 110 ℃, 140 ℃, 190 ℃, 190 ℃, 185 ℃ of head temperatures again.
3. adopt right cylinder formula 50000 Ci
60Irradiation is at room temperature carried out to polyethylene in the air in Co gamma-radiation source, and irradiation dose is 50kGy.Again with 40 parts of polyethylene, 20 parts of irradiated polyethylenes and 40 parts of Mg (OH)
2Use double-screw extruding pelletizing, each section temperature is respectively 110 ℃, 140 ℃, 190 ℃, 190 ℃, 185 ℃ of head temperatures.
Table 1 extrusion and blow molding bumper material and DSM N. V.'s bumper special material performance are relatively
The Keltan TP of polyethylene bumper special material DSM N. V. 0552/2
Performance
(extrusion and blow molding) (injection moulding)
Melting index 0.40g/10min. 7.0g/10min.
Tensile yield strength 20MPa 17MPa
Elongation at break 532% 475%Izod socle girder notched Izod impact strength
23℃ 70kJ/m
2 ＞60kJ/m
2
0℃ 71kJ/m
2 ＞60kJ/m
2
-20℃ 69kJ/m
2 ＞60kJ/m
2
-40℃ 70kJ/m
2 ＞10kJ/m
2
Modulus in flexure 1.25GPa 0.7GPa
71 ℃ 62 ℃ of heat-drawn wires
121 ℃ 115 ℃ of Vicat softening points
Shore hardness D62 D53
Claims (1)
1. adopt irradiation technique to prepare the method for extrusion and blow molding material dedicated for bumper, it is characterized in that:
(1) preparation of irradiated polyethylene
Adopt
60Co gamma-radiation source or electron electrostatic accelerator at room temperature carry out irradiation to polyethylene in the air, and irradiation dose is 1～50kGy, and on its molecular chain, introduce C=O etc. and contain the oxygen polar group,
(2) preparation of extrusion and blow molding material dedicated for bumper
With polyethylene 85～30 weight parts, irradiated polyethylene 5～30 weight parts and 10～40 weight part sericite-tridymite-cristobalites, Mg (OH)
2, CaCO
3And/or at least a in the wollastonite, adopting double-screw extruding pelletizing, each section temperature is respectively 100～110 ℃, 130～150 ℃, 170～190 ℃, 170～190 ℃, 170～185 ℃ of head temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99117467 CN1113897C (en) | 1999-12-22 | 1999-12-22 | Process for preparing special material by radiation technique for blow injection of car's fender guard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99117467 CN1113897C (en) | 1999-12-22 | 1999-12-22 | Process for preparing special material by radiation technique for blow injection of car's fender guard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1300785A CN1300785A (en) | 2001-06-27 |
| CN1113897C true CN1113897C (en) | 2003-07-09 |
Family
ID=5280090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99117467 Expired - Fee Related CN1113897C (en) | 1999-12-22 | 1999-12-22 | Process for preparing special material by radiation technique for blow injection of car's fender guard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1113897C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10217232B4 (en) * | 2002-04-18 | 2004-08-19 | Ticona Gmbh | Process for the production of filled granules from polyethylene of high or ultra-high molecular weight |
| CN106346634A (en) * | 2016-08-31 | 2017-01-25 | 浙江世博新材料股份有限公司 | Method for preparing regenerated plastic particles by using waste cloth and regenerated plastic particles |
-
1999
- 1999-12-22 CN CN 99117467 patent/CN1113897C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1300785A (en) | 2001-06-27 |
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