CN1420047A - Dust-proof cover and mfg. method thereof - Google Patents
Dust-proof cover and mfg. method thereof Download PDFInfo
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- CN1420047A CN1420047A CN 02135880 CN02135880A CN1420047A CN 1420047 A CN1420047 A CN 1420047A CN 02135880 CN02135880 CN 02135880 CN 02135880 A CN02135880 A CN 02135880A CN 1420047 A CN1420047 A CN 1420047A
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- protecting cap
- dust protecting
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- temperature
- injection
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Abstract
A dust-proof case (sealing bowl) for steering mechanism of car is prepared from polyurethane elastomer through drying at 90-100 deg.C for 2-3 hr, applying demoulding agent on mould at 20-40 deg.C, injection moulding at proper temp and pressure, and demoulding. Its advantages are high effect and long service life.
Description
(1) relate to the field:
The present invention relates to the vehicular spare parts technical field, is a kind of dust protecting cap made from polyurethane elastomer material and preparation method thereof specifically.
(2) background technology:
Used automobile dust protecting cap (obturating cup) on the present auto-industry, cushion blocking etc., it all is the rubber made from elastomeric material, resistance to abrasion because of rubber, corrosion stability, resistance to cold and weather resisting property are poor, using cracky about half a year, usually be difficult for observing as the dust protecting cap under the car, change also pretty troublesome, often bring a lot of troubles to Motor Maintenance, make automobile steering mechanism suffer the wearing and tearing of sand and dust etc., make user vehicle because of the short useful life that shortens steering hardware of dust protecting cap life-span, a kind of dust protecting cap made from polyurethane elastomer material (T-PUR) was not seen at present.
(3) summary of the invention:
Purpose of the present invention is intended to overcome the deficiency of above-mentioned prior art, and a kind of dust protecting cap made from polyurethane elastomer material (T-PUR) is provided.
Another object of the present invention provides a kind of preparation method of dust protecting cap; The present invention has mainly solved the problem that automobile is fragile with dust protecting cap, be difficult for observing and changing trouble.
In order to reach above-mentioned present, the present invention is achieved in that a kind of dust protecting cap, and it is made by polyurethane elastomer material, and its preparation technology comprises raw material drying, injection moulding, the demoulding.
To achieve these goals, the present invention is achieved in that a kind of preparation method of dust protecting cap, and its processing step is as follows:
A, raw material drying because of the T-PUR raw material has water absorbing characteristic, must carry out drying before using and handle, and baking temperature is 90-100 ℃, and the time is 2-3 hour;
B, mould, during mold design, the air in the die cavity should be able to be discharged rapidly, avoid material to entrain into gas and form cavity, the position of exhaust should be arranged on the die joint of mould or on the head part bar degree of depth be 0.02-0.05mm; Because of T-PUR heat enthalpy value height, rate of cooling is slow, and is yielding, do not fit into higher mold temperature, and the mould temperature is 20-40 ℃;
C, injection moulding, temperature is during injection moulding: 120 ℃ in a district, 160 ℃ in two districts, 220 ℃ in three districts, 215 ℃ at nozzle can be judged according to the molten condition of coming out from nozzle flow, when material when extruding, present transparent and when good mobility was arranged, temperature was comparatively suitable; The shot of injection (mo(u)lding) machine is bigger by 40% than the capacity of moulded products, and injection pressure is 800-1200kg/cm
2(gauge pressure is 70-110Kg/cm
2), injection speed is slower than general resins for universal use, and screw speed is 50-100r.p.m during plasticizing, and back pressure is 60-240Kg/cm
2(gauge pressure is 5-20Kg/cm
2), pressurize is 600-800Kg/cm
2(gauge pressure is 50-70Kg/cm
2), can not be all general 1-3 times according to the thickness of goods by resin.
D, the demoulding, T-PUR and metal are easy to bond together, so must adopt mold release, can spray or directly brushing, because T-PUR has elasticity preferably, so adopt the big easy demoulding of eedles meeting, thimble should have induction opening to prevent to produce vacuum suction simultaneously.
Realize a kind of mode preferably of the present invention, its described raw material drying temperature is 95 ℃, and the time is 2.5 hours; Its described mould temperature is 30 ℃; Its described injection pressure is 1000kg/cm
2, screw speed is 75r.p.m during plasticizing, back pressure is 150Kg/cm
2, pressurize is 700Kg/cm
2Described mold release adopts the organosilicon system.
Polyurethane elastomeric materials that a kind of dust protecting cap of the present invention is used and existing elastomeric properties compare:
1, resistance to abrasion: the taber abrasion test, load with 1000g, rotating speed 1000, wheel CS-17, see the following form:
| Material | Abrasion loss 1/mg |
| ????T-PUR | ????1.6/mg |
| Rubber | ????4.7/mg |
| Nylon 6 | ????7.4/mg |
2, mechanical characteristics: the T-PUR material has the hardness of similar ordinary hot thermoplastic plastic and higher mechanical strength, simultaneously, it possesses general elastomeric percentage elongation again, rebound resilience and stress deformation, performances such as nerve, utilize the high-tensile of T-PUR and breaking elongation, excellent tear resistance and flexibility to make and be used in ectosphere cage dust protecting cap (obturating cup) and other dust protecting cap cushion blocking etc. in the automobile steering device, have good mechanical characteristics.
3, resistance to cold: T-PUR has very high impact strength in low temperature environment, can use also can not break in-60 to-80 ℃ of scopes, shows good resistance to cold.
4, weather resisteant: T-PUR adds charcoal blacks, makes material can effectively absorb ultraviolet ray or shielding ultraviolet rays, the service life of having improved goods.
5, corrosion stability: dust protecting cap of the present invention has good oil resistant, chemical-resistant, sees the following form:
| The oil product material | Gasoline | Kerosene |
| ??T-PUR | ??0.0068％ | ??0.008％ |
| ??NBR | ??0.06％ | ??0.05％ |
| ??CR | ??0.16％ | ??0.29％ |
NBR: NBR, butadidenne CR: neoprene
6, the T-PUR energy absorption capacity is strong, Hui Xinggao, good damping effect.
Compared with the prior art a kind of dust protecting cap of the present invention and preparation method thereof has following good effect: 1, increase the service life, because T-PUR function admirable, product properties is improved greatly, the dust protecting cap of general rubber product is after installing and using 6-12 month, disrepair phenomenon is just arranged, and T-PUR just there is disrepair phenomenon after installing and using 3-4; 2, production efficiency improves, and adopts polyurethane elastomeric materials, has changed traditional rubber vulcanization process fully, makes used dust protecting cap (obturating cup) and cushion blocking on the automobile with advanced Shooting Technique, can improve 3 times production efficiency.
A kind of dust protecting cap of the present invention, see the following form with the technical index of the dust protecting cap of existing rubber:
| Index | Existing dust protecting cap | Dust protecting cap of the present invention |
| Density (g/mm 3) | ????0.98 | ??????1.23 |
| Hardness (Shao Shi A) | ????55+5 | ??????60-80 |
| Tensile strength (MPa) | ??????＞34 | |
| 100% modulus (MPa) | ????＞0.5 | ??????＞3.0 |
| 300% modulus (MPa) | ????＞0.8 | ??????＞9.4 |
| Peel strength (N/mm) | ????＞3.6 | ??????＞74 |
| Percentage elongation (%) | ????500 | ??????＞600-800 |
| Resilience (%) compressive permanent set (%) | ????50 ????＜25 | ??????＞65 ??????＜40 |
| Abrasion (mg) | ????47 | ??????＜30 |
(4) specific embodiment
In order to understand better and to implement, describe a kind of dust protecting cap of the present invention and preparation method thereof in detail below in conjunction with embodiment.
Embodiment 1, choose and the common T-PUR raw material of weighing, carrying out drying earlier handles, baking temperature is 95 ℃, time is 2.5 hours, adopt 30 ℃ of mould temperature to carry out injection moulding, temperature is 120 ℃ in a district during injection moulding, 160 ℃ in two districts, 220 ℃ in three districts, 215 ℃ at nozzle can be judged according to the molten condition of coming out from nozzle flow, when material when extruding, present transparent and when good mobility is arranged, temperature is comparatively suitable, and the shot of injection (mo(u)lding) machine is bigger by 40% than the capacity of moulded products, and injection pressure is 1000kg/cm
2, injection speed is slower than general resins for universal use, and screw speed is 75r.p.m during plasticizing, and back pressure is 150Kg/cm
2, pressurize is 700Kg/cm
2, then carry out the demoulding, adopt the mold release of organosilicon system directly to brush.
Embodiment 2, choose and the common T-PUR raw material of weighing, carry out drying earlier and handle, baking temperature is 90 ℃, and the time is 3 hours, adopts 20 ℃ of mould temperature to carry out injection moulding, temperature is 120 ℃ in a district during injection moulding, 160 ℃ in two districts, 220 ℃ in three districts, 215 ℃ at nozzle can be judged according to the molten condition of coming out from nozzle flow, when material when extruding, present transparent and when good mobility is arranged, temperature is comparatively suitable, and the shot of injection (mo(u)lding) machine is bigger by 40% than the capacity of moulded products, and injection pressure is 800kg/cm
2, injection speed is slower than general resins for universal use, and screw speed is 50r.p.m during plasticizing, and back pressure is 60Kg/cm
2, pressurize is 600Kg/cm
2, then carry out the demoulding, adopt the mold release spraying of organosilicon system.
Embodiment 3, choose and the common T-PUR raw material of weighing, carrying out drying earlier handles, baking temperature is 100 ℃, time is 2 hours, adopt 40 ℃ of mould temperature to carry out injection moulding, temperature is 120 ℃ in a district during injection moulding, 160 ℃ in two districts, 220 ℃ in three districts, 215 ℃ at nozzle can be judged according to the molten condition of coming out from nozzle flow, when material when extruding, present transparent and when good mobility is arranged, temperature is comparatively suitable, and the shot of injection (mo(u)lding) machine is bigger by 40% than the capacity of moulded products, and injection pressure is 1200kg/cm
2, injection speed is slower than general resins for universal use, and screw speed is 100r.p.m during plasticizing, and back pressure is 240Kg/cm
2, pressurize is 800Kg/cm
2, then carry out the demoulding, adopt the mold release of organosilicon system directly to brush.
Claims (6)
1, a kind of dust protecting cap, it is made by polyurethane elastomer material, and its preparation technology comprises raw material drying, injection moulding, the demoulding.
2, the preparation method of the described a kind of dust protecting cap of claim 1, its processing step is as follows:
A, raw material drying, baking temperature are 90-100 ℃, the time is 2-3 hour;
B, mould, the mould temperature is 20-40 ℃;
C, injection moulding, temperature is during injection moulding: 120 ℃ in a district, 160 ℃ in two districts, 220 ℃ in three districts, 215 ℃ at nozzle, the shot of injection (mo(u)lding) machine is bigger by 40% than the capacity of moulded products, and injection pressure is 800-1200kg/cm
2, screw speed is 50-100r.p.m during plasticizing, back pressure is 60-240Kg/cm
2, pressurize is 600-800Kg/cm
2
D, mold release is adopted in the demoulding, can spray or directly brushing.
3, by the preparation method of the described a kind of dust protecting cap of claim 2, it is characterized in that described raw material drying temperature is 95 ℃, the time is 2.5 hours.
4, by the preparation method of the described a kind of dust protecting cap of claim 2, it is characterized in that described mould temperature is 30 ℃.
5, by the preparation method of the described a kind of dust protecting cap of claim 2, it is characterized in that described injection pressure is 1000kg/cm
2, screw speed is 75r.p.m during plasticizing, back pressure is 150Kg/cm
2, pressurize is 700Kg/cm
2
6,, it is characterized in that described mold release adopts the organosilicon system by the preparation method of the described a kind of dust protecting cap of claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135880 CN1208212C (en) | 2002-12-14 | 2002-12-14 | Dust-proof cover and mfg. method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135880 CN1208212C (en) | 2002-12-14 | 2002-12-14 | Dust-proof cover and mfg. method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1420047A true CN1420047A (en) | 2003-05-28 |
| CN1208212C CN1208212C (en) | 2005-06-29 |
Family
ID=4748408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02135880 Expired - Fee Related CN1208212C (en) | 2002-12-14 | 2002-12-14 | Dust-proof cover and mfg. method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1208212C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708647B (en) * | 2009-12-04 | 2012-08-01 | 于功宝 | Special mold for reparation of polyurethane dust-proof sheath |
-
2002
- 2002-12-14 CN CN 02135880 patent/CN1208212C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708647B (en) * | 2009-12-04 | 2012-08-01 | 于功宝 | Special mold for reparation of polyurethane dust-proof sheath |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1208212C (en) | 2005-06-29 |
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