CN108641313B - Valve body for vacuum booster and preparation method thereof - Google Patents
Valve body for vacuum booster and preparation method thereof Download PDFInfo
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- CN108641313B CN108641313B CN201810480208.6A CN201810480208A CN108641313B CN 108641313 B CN108641313 B CN 108641313B CN 201810480208 A CN201810480208 A CN 201810480208A CN 108641313 B CN108641313 B CN 108641313B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention relates to the manufacture of automobile parts, in particular to a valve body for a vacuum booster and a preparation method thereof, which solve the problem of poor mechanical strength of the valve body for the vacuum booster and have the technical scheme key points that: the utility model provides a valve body for vacuum booster, is including integrated into one piece's first connecting portion and second connecting portion, and first connecting portion and second connecting portion are extruded, compression molding through the raw materials blending of following parts by mass: 50-65 parts of PBT, 25-40 parts of PET, 5-10 parts of POE-g-GMA, 15-25 parts of glass fiber, 5-10 parts of potassium hexatitanate whisker, 5-10 parts of nucleating agent, 0.1-0.5 part of potassium titanate coupling agent, 0.2-0.5 part of triphenyl phosphite, 0.1-0.2 part of polycarbonate, 0.1-0.3 part of anti-aging agent and 0.1-0.2 part of antioxidant, so that the valve body for the vacuum booster has the advantages of high dimensional stability, excellent mechanical property, good wear resistance, stable product structure, high strength, small friction factor, good matching degree with other parts, difficult deformation and high safety.
Description
Technical Field
The invention relates to the manufacture of automobile parts, in particular to a valve body for a vacuum booster and a preparation method thereof.
Background
The vacuum booster is a component that uses vacuum (negative pressure) to increase the force applied to the pedal by the driver. The valve body is an important part in the vacuum booster, the vent groove is designed in the middle through structural design, the vacuum of the front cavity and the rear cavity of the vacuum booster is controlled through the contact/disconnection of the valve bowl and the valve body, and the quality of the vacuum booster plays a decisive role in the sensitivity of automobile braking.
The utility model discloses an improved vacuum booster valve body as patent publication of grant publication number CN206926629U, includes valve body and valve bowl, the inside of valve body is linked together with front chamber and back chamber through air channel one, air channel two, air channel three and air channel four, the inside of valve body is provided with the valve bowl, the valve bowl passes through the vacuum valve and is connected with the response spring, the response spring passes through the spring holder and is connected with the action bars, the action bars passes through the pin and is connected with brake pedal, the inside of valve body is provided with briquetting and involucra board, and the briquetting passes through the output pole and is connected with the brake master cylinder, can make inside gas clean in the twinkling of an eye, also can clean in the twinkling of an eye when taking out the vacuum again, makes the automobile braking in-process have higher sensitivity. However, since the valve body is generally made of phenolic resin, its mechanical strength is not good.
Disclosure of Invention
The first purpose of the invention is to provide a valve body for a vacuum booster, which improves the mechanical strength of the valve body.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a valve body for vacuum booster, is including integrated into one piece's first connecting portion and second connecting portion, and first connecting portion and second connecting portion are extruded, compression molding through the raw materials blending of following parts by mass: 50-65 parts of PBT, 25-40 parts of PET, 5-10 parts of POE-g-GMA, 15-25 parts of glass fiber, 5-10 parts of potassium hexatitanate whisker, 5-10 parts of nucleating agent, 0.1-0.5 part of potassium titanate coupling agent, 0.2-0.5 part of triphenyl phosphite, 0.1-0.2 part of polycarbonate, 0.1-0.3 part of anti-aging agent and 0.1-0.2 part of antioxidant.
By adopting the technical scheme, the PBT and the PET are thermoplastic polyesters, have the characteristics of high temperature resistance, moisture resistance, chemical corrosion resistance, good electrical insulation and the like, and can keep good mechanical properties within a wider range of temperature. The crystallization speed of the PBT resin is high, the deformation is easily caused by uneven cooling and heating in the molding process, the crystallization speed of the PET is low, and the molding period is long; the alloy prepared by blending and modifying the PBT and the PET can make up for the deficiencies of the PBT and has better comprehensive performance, and meanwhile, the cost can be saved because the PET is cheaper. In the blending process of PET and PBT, the glass fiber can play a role in reinforcement, the heat resistance and the electrical insulation of the reinforced alloy are more excellent, the mechanical strength and the rigidity are greatly higher than those of other reinforced materials, the elastic modulus is high, the creep property is excellent, the impact resistance and the fatigue resistance are good, and the friction resistance is good. The POE-g-GMA is used as a compatibilizer, and the epoxy functional group of the compatibilizer can react with the carboxyl and hydroxyl at the end of PBT and PET to generate more block copolymers, so that the impact strength of the alloy is improved. The potassium hexatitanate whisker is a monoclinic crystal whisker-shaped reinforcing material, has good chemical stability, and can improve the interface strength between the potassium hexatitanate whisker and PET/PBT after the surface of the potassium hexatitanate whisker is activated and modified by a potassium titanate coupling agent; so that the potassium hexatitanate crystal whisker can be uniformly dispersed in the system.
The addition of the nucleating agent can accelerate the crystallization rate, increase the crystallization density, further improve the defect of low crystallization speed of PET, simultaneously avoid the deformation in the crystallization process of PBT, improve the rigidity and the wear resistance of the product and avoid the warping. Triphenyl phosphite can inhibit ester exchange and simultaneously cause chain extension reaction among molecules, thereby improving the tensile property of a system, greatly improving the unnotched impact strength, enabling the viscosity of the alloy to present the characteristic of pseudoplastic fluid shear thinning and improving the processing property; the crystallization ability can be further improved by compounding with a nucleating agent. The addition of the polycarbonate can refine crystal particles, further improve the dimensional stability and improve the transparency of the product.
The anti-aging agent and the antioxidant are used as additives, so that the aging of the alloy can be delayed, the loss of the alloy performance is reduced, and the formed product has a longer service life.
The alloy prepared by the method has the characteristics of high dimensional stability, excellent mechanical property and good wear resistance; the valve body prepared from the high-strength high-friction-coefficient high-strength high-safety vacuum booster is used in a vacuum booster, and is stable in structure, high in strength, small in friction factor, good in matching degree with other parts, not prone to deformation, good in stability and high in safety.
Preferably, the nucleating agent is formed by mixing an organic nucleating agent and an inorganic nucleating agent according to the mass ratio of 1: 1.
By adopting the technical scheme, the inorganic nucleating agent has low price and a reinforcing effect, the organic nucleating agent overcomes the problem of poor transparency and gloss of the inorganic nucleating agent, and the processing performance and the surface performance of the product can be remarkably improved by compounding the organic nucleating agent and the inorganic nucleating agent.
Preferably, the organic nucleating agent is one of sodium benzoate and polyethylene oxide.
By adopting the technical scheme, the organic nucleating agent such as sodium benzoate or polyoxyethylene is beneficial to the nucleation and crystallization of the alloy.
Preferably, the inorganic nucleating agent is one or more of talcum powder, sodium chloride, zinc oxide and montmorillonite.
By adopting the technical scheme, the inorganic nucleating agent can promote nucleation and crystallization, and has the effects of reinforcing and improving the wear resistance under the surface activation of the coupling agent; in addition, the sodium chloride and the polyoxyethylene have synergistic effect, have better nucleation effect and crystallization promotion effect, improve processing conditions and improve heat resistance.
Preferably, the anti-aging agent is prepared by compounding the ultraviolet absorber 3638 and the light stabilizer 152 according to the weight ratio of 1: 1.
By adopting the technical scheme, the anti-aging agent prepared according to the above proportion has excellent anti-aging performance, and can delay the performance loss of the alloy.
Preferably, the antioxidant is antioxidant 3114.
By adopting the technical scheme, the antioxidant 3114 has extremely low volatility, small mobility and good water extraction resistance, and can endow PET and PBT with excellent thermal oxidation resistance and photo-oxidation resistance; and the compound has synergistic effect with ultraviolet absorbent or phosphite ester, and can further improve the photo-thermal stability.
Preferably, the first connecting portion comprises a first connecting ring connected to the second connecting portion and a second connecting ring connected with the first connecting ring in a stepped manner, the second connecting ring comprises a first bending ring extending towards the circumferential direction of the first connecting ring, a second bending ring vertically connected to the first bending ring and an arc ring obliquely connected to the second bending ring, the outer edge of the arc ring is connected with a flange parallel to the second bending ring, and the flange and the arc ring are enclosed to form an abutting cavity.
By adopting the technical scheme, the first connecting part is designed into the first connecting ring and the second connecting ring which are in a step shape, and the second connecting ring comprises the first bending ring, the second bending ring, the arc-shaped ring and the flanging, so that the second connecting ring is in an irregular bulge shape; simultaneously, form the butt chamber through arc ring and turn-ups to the stability of vacuum booster operation in-process valve body has been improved.
Preferably, the second connecting portion includes a positioning outer ring and a positioning inner ring coaxially disposed with the positioning outer ring, the positioning ring is provided with a positioning hole, the positioning hole includes a first positioning hole and a second positioning hole, the aperture of the first positioning hole is larger than that of the second positioning hole, and a gas passing hole is formed between the first positioning hole and the second positioning hole.
Through adopting above-mentioned technical scheme, the seting up of crossing the gas pocket can supply gas to pass through, makes gas enter into the location inner ring to in making air current evenly distributed and the second connecting portion, avoid location inner ring department to produce the negative pressure, improved the stability of the interior air current of locating ring.
The second purpose of the invention is to provide a preparation method of the valve body for the vacuum booster, which enables the valve body for the vacuum booster to be molded.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of a valve body for a vacuum booster comprises the following steps:
step1, stirring and drying PBT and PET for 3 hours at 115 ℃ by a paddle dryer;
step2, uniformly stirring the potassium titanate coupling agent and white oil according to the mass ratio of 1:10, and uniformly spraying the mixture on the surface of the potassium hexatitanate whisker by a sprayer;
step3, mixing the materials obtained in Step1 and Step2 with POE-g-GMA, nucleating agent, triphenyl phosphite, polycarbonate, anti-aging agent and antioxidant, and stirring uniformly;
step4, feeding the material obtained in Step3 from a main feeding port of a double-screw extruder, simultaneously feeding glass fiber at a side feeding port, melting, mixing, extruding and granulating to obtain plastic particles;
and Step5, carrying out melt compression molding on the plastic particles obtained in the Step4 by an injection molding machine to obtain the valve body for the vacuum booster.
By adopting the technical scheme, the potassium titanate coupling agent is sprayed on the potassium hexatitanate whisker to play a role in activating the surface of the potassium hexatitanate whisker, and the white oil can improve the dispersibility, improve the processability and ensure that the forming effect is better.
In conclusion, the invention has the following beneficial effects:
1. the valve body for the vacuum booster has the advantages that the first connecting ring, the first bending ring, the second bending ring, the arc-shaped ring, the flanging, the reinforcing ring and the reinforcing ribs are designed in a step shape, so that the first connecting ring is irregularly raised, and the valve body has higher mechanical strength on the premise of not increasing the wall thickness;
2. the valve body for the vacuum booster formed by using the PET/PBT alloy has the advantages of high dimensional stability, excellent mechanical property, good wear resistance, stable product structure, high strength, small friction factor, good matching degree with other parts, difficult deformation and high safety.
Drawings
FIG. 1 is a schematic view of an overall structure of a valve body for a vacuum booster;
fig. 2 is a schematic cross-sectional view of a valve body for a vacuum booster.
In the figure, 1, a second connecting part; 11. positioning the outer ring; 12. positioning the inner ring; 121. positioning the boss; 122. a first positioning hole; 123. a second positioning hole; 124. air passing holes; 13. an air chamber; 2. a first connection portion; 21. a first connecting ring; 211. an inclined plane ring; 2111. a recess; 212. a third bending ring; 22. a second connection ring; 221. a first bending ring; 222. a second bending ring; 223. an arc-shaped ring; 2231. an outer arc surface; 2232. an inner plane; 23. a reinforcement ring; 24. flanging; 25. an abutment cavity; 26. A conical lumen; 27. and (5) reinforcing ribs.
Detailed Description
Example 1
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, a valve body for a vacuum booster includes a first connecting portion 2 facing a push rod of a master cylinder and a second connecting portion 1 facing the push rod of the booster, and the first connecting portion 2 and the second connecting portion 1 are integrally formed and coaxially disposed.
Referring to fig. 1 and 2, the first connection part 2 has a horn shape with a small diameter end connected to the second connection part 1, and includes a first connection ring 21 connected to the second connection part 1 and a second connection ring 22 connected to the first connection ring 21 in a stepped shape. The first connection ring 21 includes a bevel ring 211 connected to the second connection portion 1 in an inclined manner opposite to the axis of the first connection portion 2, and a third bending ring 212 connected to the outer edge of the bevel ring 211 in parallel with the axis of the first connection portion 2. The outer surface of the bevel ring 211 is recessed in the axial direction of the first connection portion 2, and a concave portion 2111 is formed in an arc shape around the bevel ring 211, and the concave portion 2111 is provided coaxially with the bevel ring 211.
Referring to fig. 1 and 2, the second connection ring 22 includes a first bending ring 221 perpendicularly connected to the third bending ring 212, a second bending ring 222 perpendicularly connected to the first bending ring 221, and an arc-shaped ring 223 obliquely connected to the second bending ring 222. The first bending ring 221 is connected to the third bending ring 212 in the direction opposite to the axial direction of the first connecting portion 2, and a reinforcing ring 23 for thickening the third bending ring 212 is formed at the connecting portion of the first bending ring 221 and the third bending ring 212. The end surface of the second bending ring 222 is arranged in parallel with the axis of the first connecting portion 2. The outer edge of the curved ring 223 is connected with a flange 24 parallel to the second bending ring 222. The arc-shaped ring 223 comprises an outer arc surface 2231 for arc-shaped transition of the second bending ring 222 and the outer surface of the flange 24 and an inner plane 2232 for vertically connecting the second bending ring 222 and the inner surface of the flange 24, wherein the inner plane 2232 is vertical to the axis of the first connecting part 2. The flange 24 and the arc-shaped ring 223 enclose to form an abutting cavity 25. The inner portions of the first and second connection rings 21, 22 enclose a conical inner cavity 26 communicating with the abutment cavity 25. The first connecting ring 21 and the second connecting ring 22 are also provided with a plurality of arc-shaped reinforcing ribs 27 at equal intervals on the inner wall of the conical inner cavity 26. A through hole (not shown in the figure) for communicating the conical inner cavity 26 with the second connecting part 1 is also formed between two adjacent reinforcing ribs 27.
Referring to fig. 1 and 2, the second connecting portion 1 includes a cylindrical positioning outer ring 11 and a positioning inner ring 12 coaxially disposed with the positioning outer ring 11 and penetrating the positioning outer ring 11. Two air chambers 13 are symmetrically arranged on the positioning outer ring 11. The positioning inner ring 12 is formed with a positioning boss 121 protruding toward one end of the tapered inner cavity 26. The axis position of the positioning inner ring 12 is provided with a positioning hole for communicating the second connecting part 1 and the conical cavity. The positioning holes include a first positioning hole 122 and a second positioning hole 123. The first positioning hole 122 and the second positioning hole 123 are coaxially disposed, and the diameter of the first positioning hole 122 is larger than that of the second positioning hole 123. The second connecting portion 1 is located between the first positioning hole 122 and the second positioning hole 123 and is provided with a gas passing hole 124 for communicating the gas chamber 13 with the positioning hole.
When the vacuum valve is used, the inside of the valve body is vacuumized through an engine, and cavities of the first connecting portion 2 and the second connecting portion 1 are both vacuum. At the moment, a brake pedal is stepped, a push rod of the booster is pushed to a certain stroke to open the vacuum valve, the atmosphere instantly enters the second connecting part 1, and the first connecting part 2 is isolated from the second connecting part 1; the main cylinder push rod moves forwards to play a role of assisting in atmospheric pressure, hydraulic pressure required by braking is established in the main cylinder push rod, when a brake pedal is released, the spring restores the booster push rod to an initial state to enable the first connecting portion 2 and the second connecting portion 1 to be communicated through the positioning hole, and under the vacuum pumping of the engine, the first connecting portion 2 and the second connecting portion 1 are simultaneously filled with vacuum to prepare for the next braking.
Example 2a
A preparation method of a valve body for a vacuum booster comprises the following steps:
step1, stirring and drying 50 parts of PBT and 25 parts of PET for 3 hours at 115 ℃ by a paddle dryer;
step2, uniformly stirring 0.1 part of potassium titanate coupling agent and white oil according to the mass ratio of 1:10, and uniformly spraying the mixture on the surface of 5 parts of potassium hexatitanate whisker by a sprayer;
step3, mixing the materials obtained in Step1 and Step2 with 5 parts of POE-g-GMA, 5 parts of nucleating agent, 0.2 part of triphenyl phosphite, 0.1 part of polycarbonate, 0.1 part of anti-aging agent and 0.1 part of antioxidant, and uniformly stirring; the nucleating agent is formed by mixing an organic nucleating agent and an inorganic nucleating agent according to the mass ratio of 1: 1; the anti-aging agent is prepared by compounding an ultraviolet absorbent 3638 and a light stabilizer 152 according to the weight ratio of 1: 1;
step4, feeding the material obtained in Step3 from a main feeding port of a double-screw extruder, simultaneously feeding 15 parts of glass fiber at a side feeding port, and carrying out melt mixing, extrusion and granulation to obtain plastic particles;
and Step5, carrying out melt compression molding on the plastic particles obtained in the Step4 by an injection molding machine to obtain the valve body for the vacuum booster.
In the embodiment, the organic nucleating agent is sodium benzoate; the inorganic nucleating agent is talcum powder; the antioxidant is hindered amine antioxidant.
Examples 2 b-2 e were prepared in the same manner as example 2a, differing only in the specific components and the content of the specific components. The specific components and component amounts in examples 2 b-2 e are shown in the following table:
five groups of valve bodies for the vacuum booster are prepared by the method provided by the embodiment 2a to the embodiment 2e, and three groups of valve bodies for the vacuum booster are obtained by taking pure PBT material, pure PET material and blend material of PBT and PET as raw materials and performing melt compression molding by an injection molding machine and are used as the comparative example 2a, the comparative example 2b and the comparative example 2c for evaluation respectively.
The valve bodies for vacuum boosters prepared in examples 2a to 2e and comparative examples 2a to 2c were subjected to the following tests.
The friction performance is as follows: friction performance was tested according to ASTM G99-05 and friction faces were observed;
impact Strength (KJ/m)2): the impact strength is measured according to GB/T1043.1-2008 determination of impact performance of the plastic simply supported beam;
tensile strength (MPa): the tensile strength is measured according to GB/T1040.1-2006 determination of tensile property of plastics;
and (3) aging resistance test: immersing the piston in deionized water at 100 ℃ for 8h, taking out the piston, testing the impact strength and the tensile strength, and recording the tensile aging degree and the impact aging degree, wherein the tensile aging rate x is the tensile strength after aging/initial tensile strength 100%; impact aging rate y-post-aged impact strength/initial impact strength 100%.
The test results are given in the following table:
the present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (4)
1. The utility model provides a valve body for vacuum booster which characterized in that, including integrated into one piece's first connecting portion (2) and second connecting portion (1), first connecting portion (2) and second connecting portion (1) are extruded, compression molding through the raw materials blending of following parts by mass: 50-65 parts of PBT, 25-40 parts of PET, 5-10 parts of POE-g-GMA, 15-25 parts of glass fiber, 5-10 parts of potassium hexatitanate whisker, 5-10 parts of nucleating agent, 0.1-0.5 part of potassium titanate coupling agent, 0.2-0.5 part of triphenyl phosphite, 0.1-0.2 part of polycarbonate, 0.1-0.3 part of anti-aging agent and 0.1-0.2 part of antioxidant; 1-5 parts of white oil;
the nucleating agent is formed by mixing an organic nucleating agent and an inorganic nucleating agent according to the mass ratio of 1:1, and the organic nucleating agent is one of sodium benzoate or polyoxyethylene; the inorganic nucleating agent is one or more of talcum powder, sodium chloride, zinc oxide and montmorillonite;
wherein, the anti-aging agent is formed by compounding an ultraviolet absorber 3638 and a light stabilizer 152 according to the weight ratio of 1:1, and the antioxidant is an antioxidant 3114.
2. The valve body for the vacuum booster according to claim 1, wherein the first connecting portion (2) comprises a first connecting ring (21) connected to the second connecting portion (1) and a second connecting ring (22) connected to the first connecting ring (21) in a step shape, the second connecting ring (22) comprises a first bending ring (221) extending circumferentially towards the first connecting ring (21), a second bending ring (222) vertically connected to the first bending ring (221), and an arc-shaped ring (223) obliquely connected to the second bending ring (222), a flange (24) parallel to the second bending ring (222) is connected to an outer edge of the arc-shaped ring (223), and the flange (24) and the arc-shaped ring (223) enclose to form an abutting cavity (25).
3. The valve body for the vacuum booster according to claim 1, wherein the second connecting portion (1) comprises a positioning outer ring (11) and a positioning inner ring (12) coaxially arranged with the positioning outer ring (11), the positioning ring is provided with a positioning hole, the positioning hole comprises a first positioning hole (122) and a second positioning hole (123), the diameter of the first positioning hole (122) is larger than that of the second positioning hole (123), and an air passing hole (124) is formed between the first positioning hole (122) and the second positioning hole (123).
4. The method for manufacturing a valve body for a vacuum booster according to any one of claims 1 to 3, characterized by comprising the steps of:
step1, stirring and drying PBT and PET for 3 hours at 115 ℃ by a paddle dryer;
step2, uniformly stirring the potassium titanate coupling agent and white oil according to the mass ratio of 1:10, and uniformly spraying the mixture on the surface of the potassium hexatitanate whisker by a sprayer;
step3, mixing the materials obtained in Step1 and Step2 with POE-g-GMA, nucleating agent, triphenyl phosphite, polycarbonate, anti-aging agent and antioxidant, and stirring uniformly;
step4, feeding the material obtained in Step3 from a main feeding port of a double-screw extruder, simultaneously feeding glass fiber at a side feeding port, melting, mixing, extruding and granulating to obtain plastic particles;
and Step5, carrying out melt compression molding on the plastic particles obtained in the Step4 by an injection molding machine to obtain the valve body for the vacuum booster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480208.6A CN108641313B (en) | 2018-05-18 | 2018-05-18 | Valve body for vacuum booster and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810480208.6A CN108641313B (en) | 2018-05-18 | 2018-05-18 | Valve body for vacuum booster and preparation method thereof |
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| CN108641313B true CN108641313B (en) | 2020-08-07 |
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| CN115141468B (en) * | 2021-03-30 | 2023-09-15 | 合肥杰事杰新材料股份有限公司 | Low-temperature impact resistant PBT composite material and preparation method thereof |
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