CN112677530A - Preparation method of 12kV green environment-friendly energy-saving contact box - Google Patents
Preparation method of 12kV green environment-friendly energy-saving contact box Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention relates to a preparation method of a 12kV environment-friendly energy-saving contact box, which comprises the following steps: step one, preparing materials: preparing raw materials PA66-GF30, reinforced composite formula materials accounting for 3-8% of the weight of the raw materials, toner or color master batch accounting for 1-5% of the weight of the raw materials and white oil accounting for 1-2% of the weight of the raw materials; step two, stirring: pouring the raw materials into a stirrer, adding white oil, fully and uniformly stirring, sequentially adding the reinforced composite material and the toner or color master, and stirring to obtain a mixture; step three, drying materials: placing the mixture in a drying oven or automatically loading the mixture into a charging basket of equipment for drying; step four, production: and adding the thermoplastic composite material into a corresponding injection mold, and performing injection molding after an insert is additionally arranged in the injection mold. The novel environment-friendly energy-saving contact box obtained by the invention has the characteristics of better electrical and mechanical properties, lighter and more compact structure, environmental protection and durability, and completely meets the requirements of environmental protection and energy conservation.
Description
Technical Field
The invention relates to the field of preparation of contact boxes, in particular to a preparation method of a 12kV environment-friendly energy-saving contact box.
Background
At present, the insulation piece of the medium voltage switchgear in China mainly adopts epoxy resin curing system composite materials and is formed by injection molding by using an APG process. Although the technology is mature, the waste generated in the production process of the epoxy resin can change the pH value of water and soil; after the epoxy resin cast insulation product is scrapped, the epoxy resin can not be degraded to become stubborn garbage of nature; if the epoxy grease is burnt, a large amount of carcinogenic substances can be generated, thus harming human health and polluting environment. Meanwhile, the APG process injection molding technology has the advantages that the conditions of pretreatment, material mixing, pouring and curing of raw materials must be strictly controlled, so that air gaps and air bubbles in the product and on the surface can be avoided, internal stress is reduced, cracks are prevented, and the like, the processing technology is complex, the energy consumption is high, and the production efficiency is low. With the increasing aggravation of the environmental pollution problem, the promotion of green, low-carbon and cyclic development becomes the responsibility of enterprises, and becomes an urgent task for improving the manufacturing competitiveness of China. The thermoplastic engineering plastic has the characteristics of light weight, high strength, convenience in processing, recoverability and the like. Has been widely used in various fields.
At present, ABB is successfully applied to injection molding of solid-sealed polar columns in the application of 12kV medium-voltage switch cabinets. China also has application for post-loading type solid-sealed polar poles and manufacturing of insulating pull rods, and the strength and the insulating property of the post-loading type solid-sealed polar poles are fully verified, so that the application of the thermoplastic engineering plastic insulating part in the switch equipment becomes possible.
Disclosure of Invention
In summary, in order to overcome the defects of the prior art, the invention provides a preparation method of a 12kV green, environment-friendly and energy-saving contact box, which is used for 12kV handcart type high-voltage complete switch products and various handcart type switch cabinets using the contact box prepared by the invention, and plays roles of insulation, isolation and connection transition.
The technical scheme for solving the technical problems is as follows: a preparation method of a 12kV green environment-friendly energy-saving contact box comprises the following steps:
step one, preparing materials: preparing raw materials PA66-GF30, reinforced composite formula materials accounting for 3-8% of the weight of the raw materials, toner or color master batch accounting for 1-5% of the weight of the raw materials and white oil accounting for 1-2% of the weight of the raw materials;
step two, stirring: pouring the raw materials into a stirrer, adding white oil, fully and uniformly stirring, sequentially adding the reinforced composite material and the toner or color master, and stirring to obtain a mixture;
step three, drying materials: placing the mixture in a drying oven or automatically loading the mixture into a charging basket of equipment to be dried to obtain a thermoplastic composite material;
step four, production: and adding the thermoplastic composite material into a corresponding injection mold, and performing injection molding after an insert is additionally arranged in the injection mold.
On the basis of the technical scheme, the invention can be further improved as follows:
further, the reinforced composite formula material in the step one is a toughening agent and a defoaming agent.
Further, in the second step, forward and reverse rotation are alternately stirred for more than forty minutes, and the stirring speed is 60-80 revolutions per minute.
Further, in the third step, the drying temperature is set to be 120 ℃, and the drying is continuously carried out for 6 to 8 hours.
Further, the injection parameters in step four were as follows: the mold locking pressure is 20MPa-85MPa, and the mold locking speed is 20 mm/s; the mold opening pressure is 35MPa-60MPa, and the mold opening speed is 30 mm/S; the mold closing, filling, pressure maintaining, glue returning, cooling, mold opening and demolding temperatures are as follows in sequence: 300 ℃, 280 ℃, 265 ℃, 260 ℃, 255 ℃, 245 ℃ and 235 ℃.
The invention has the beneficial effects that:
1) the novel green environment-friendly energy-saving contact box adopts the green environment-friendly thermoplastic engineering plastic as the insulating material, and compared with the matrix thermoplastic engineering plastic, the thermoplastic engineering plastic has obvious performance advantages which are mainly shown in that the strength in the glass fiber direction is improved; secondly, the strength is improved at high temperature; the creep resistance is improved; fourthly, the paint can resist special environments such as ultraviolet rays and high temperature, and the performance is obviously improved; the impact resistance and the thermal shock resistance are good; sixthly, fatigue resistance is improved, and flame retardance is improved. According to data, 30% glass fiber reinforced PA66 for DSM international company is compared with the same type of PA6, the load heat distortion temperature is improved by 30% (240 ℃), the cantilever beam impact strength is improved by 38% (117.4J/m), the tensile strength is improved by 12%, the bending strength is improved by 18% (2800MPa), and the cost is reduced by 10%; 33 percent of glass fiber reinforced nylon 6T developed by Amdco company has the heat distortion temperature of 285 ℃, 40 percent of glass fiber reinforced grade bending strength of 310MPa, the elastic modulus of 14GPa, good moisture resistance and no change after being placed for a long time in a humid environment. The performance parameters of mechanical strength, thermal stability, electrical insulation and the like after the thermoplastic molding are greatly improved.
2) The partial discharge of the invention can reach 0.24pC through test and detection, which is far less than the standard of less than or equal to 3pC specified by national network, and the weight of the invention is reduced by more than 60 percent compared with the original epoxy resin material, thus the invention completely surpasses the performance of epoxy resin insulating parts.
3) The insulating material adopts blue (RGB 14/30/125) in color, and fully embodies the product characteristics.
4) The invention has the characteristics of better electrical and mechanical properties, lighter product, more compact structure, more environmental protection and durability.
5) The material used in the invention can completely replace epoxy resin material, and completely meets the requirements of green, environmental protection and energy saving.
Detailed Description
The principles and features of this invention are described below in conjunction with specific examples, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
A preparation method of a 12kV green environment-friendly energy-saving contact box comprises the following steps:
step one, preparing materials: preparing raw materials PA66-GF30, preparing a reinforced composite formula material accounting for 3 percent of the weight of the raw materials, toner or color master batch accounting for 1 percent of the weight of the raw materials and white oil accounting for 1 percent of the weight of the raw materials, wherein the reinforced composite formula material is a toughening agent and a defoaming agent;
step two, stirring: pouring the raw materials into a stirrer, adding white oil, fully and uniformly stirring, sequentially adding the reinforced composite material and the toner or color master, and stirring for fifty minutes in a forward and reverse rotation manner to obtain a mixture, wherein the stirring speed is 60 revolutions per minute;
step three, drying materials: placing the mixture in a drying oven or automatically loading the mixture into a charging basket of equipment to be continuously dried for 6 hours to obtain a thermoplastic composite material (PT), wherein the drying temperature is 120 ℃;
step four, production: and adding the thermoplastic composite material into a corresponding injection mold, and performing injection molding after an insert is additionally arranged in the injection mold. The method comprises the following specific steps:
1. and checking and installing the die.
2. Starting up, debugging the die, checking air separation and air closure, wherein the die equipment is flexible and normal in action and has no abnormal sound; and starting the equipment to heat.
3. And calling a corresponding program according to the product type, checking the program again and running the program in an idle load mode for three times.
4. The injection parameters in step four were as follows: the mold locking pressure is 20MPa-85MPa in sequence, and the mold locking speed is 20 mm/s; the die opening pressure is as follows in sequence: 35MPa-60MPa, and the die opening speed is 30 mm/S; the mold closing, filling, pressure maintaining, glue returning, cooling, mold opening and demolding temperatures are as follows in sequence: 300 ℃, 280 ℃, 265 ℃, 260 ℃, 255 ℃, 245 ℃ and 235 ℃. The mold is installed on the injection molding machine, and the mold locking pressure, the mold locking speed, the mold opening pressure and the mold opening speed are adjusted by setting relevant parameters of the injection molding machine.
5. No error exists in no-load operation, no insert is added for trial production, and the check weight is qualified; and then the production is carried out according to the program, the formal production is carried out after the first die is qualified, and the weight of each product needs to be checked by an electronic balance.
The whole product process flow is as follows: the method comprises the steps of material preparation, material mixing, material drying, material loading, bin heating, starting-up equipment heating, mold loading, parameter debugging, empty machine mold testing, full material mold testing, formal mold testing, inspection, production, inspection, qualified laser surfacing and qualified boxing and warehousing.
The product quality is ensured: the bin of the machine head of the device is checked cleanly, the die is firmly installed, the surface of a test die of a product is smooth and clean, no crack exists, no material is left in a sand hole, no pattern water mark exists, no obvious glass fiber leaks outwards, and the weight of the product meets the requirement; and checking that the mechanical and electrical performance parameters of the product meet the requirements, and boxing and warehousing the product.
Example 2
A preparation method of a 12kV green environment-friendly energy-saving contact box comprises the following steps:
step one, preparing materials: preparing raw materials PA66-GF30, preparing a reinforced composite formula material accounting for 5 percent of the weight of the raw materials, toner or color master accounting for 3 percent of the weight of the raw materials and white oil accounting for 1.5 percent of the weight of the raw materials, wherein the reinforced composite formula material is a toughening agent and a defoaming agent;
step two, stirring: pouring the raw materials into a stirrer, adding white oil, fully and uniformly stirring, sequentially adding the reinforced composite material and the toner or color master, and stirring for sixty minutes in a positive and negative rotation manner to obtain a mixture, wherein the stirring speed is 70 revolutions per minute;
step three, drying materials: placing the mixture in a drying oven or automatically loading the mixture into a charging basket of equipment to be continuously dried for 6 to 8 hours to obtain a thermoplastic composite material (PT), wherein the drying temperature is 120 ℃;
step four, production: same as in example 1.
Example 3
A preparation method of a 12kV green environment-friendly energy-saving contact box comprises the following steps:
step one, preparing materials: preparing raw materials PA66-GF30, an enhanced composite formula material accounting for 8 percent of the weight of the raw materials, toner or color master accounting for 5 percent of the weight of the raw materials and white oil accounting for 2 percent of the weight of the raw materials, wherein the enhanced composite formula material is a toughening agent and a defoaming agent;
step two, stirring: pouring the raw materials into a stirrer, adding white oil, fully and uniformly stirring, sequentially adding the reinforced composite material and the toner or color master, and stirring for more than forty minutes in a positive and negative rotation manner to obtain a mixture, wherein the stirring speed is 80 revolutions per minute;
step three, drying materials: placing the mixture in a drying oven or automatically loading the mixture into a charging basket of equipment to be dried for 8 hours continuously to obtain a thermoplastic composite material (PT), wherein the drying temperature is 120 ℃;
step four, production: same as in example 1.
Test data
The method comprises the steps of manufacturing a mold according to a design drawing of the contact box, adjusting and uniformly mixing materials according to the material proportion, matching ridge parts, carrying out hot-pressing curing, trimming after molding, removing burrs, and using after inspection is qualified.
The handcart type switch cabinet of the contact box prepared by the invention can completely meet the standard and design requirements through all types of test items and all test data specified by the standard. The application of the thermoplastic engineering plastic insulating material in a 12kV handcart type switch cabinet is met in the aspects of insulation test, partial discharge test, mechanical test, short-time withstand current and peak withstand current test, electric service life test, temperature rise test, thermal aging performance test and the like of a corresponding test equipment determination cabinet.
The thermoplastic composite (PT) obtained in example 1 was compared with the properties of a conventional epoxy resin curing system (APGE) and the results are as follows:
1. comparison of Material Properties
1. Physical Properties
| Distinguishing | Density (g/cm3) | Coefficient of linear expansion | Heat distortion temperature DEG C | Flame retardancy |
| Epoxy resin curing System (APG) | 2.32 | 31 | 180 | HB |
| Thermoplastic composite material (PT) | 1.15 | 24 | 240 | V-0 |
2. Mechanical properties
| Distinguishing | Tensile Strength (MPa) | Flexural Strength (MPa) | Unnotched impact Strength (MPa) | Tensile strain at break |
| Epoxy resin curing System (APG)) | 89 | 135 | 18 | ＜1％ |
| Thermoplastic composite material (PT) | 180 | 298 | 72 | 4.50％ |
3. Electrical performance
| Distinguishing | Dielectric strength (KV/mm) | Dielectric constant (60Hz) | Volume resistivity (omega/cm)3) | Comparative Tracking Index (CTI) |
| Epoxy resin curing System (APG) | 22 | 4.2 | ＞1E+16 | ＞600 |
| Thermoplastic composite material (PT) | 38 | 4.1 | ＞1E+15 | ＞600 |
The following conclusions can be drawn from table 1: compared with the traditional epoxy resin curing system (APGE), the physical property, the mechanical property and the electrical property of the thermoplastic composite material (PT) obtained in the embodiment 1 are greatly improved.
2. Comparison of electrical insulation products
| Parameter(s) | Epoxy resin product | The thermoplastic modified composite material product |
| Mechanical strength and Properties | ++ | ++++ |
| Dielectric strength | ++ | ++ |
| Low temperature characteristics | ++ | +++ |
| Thermal conductivity | + | + |
| Stability to heat of operation | ++ | +++ |
| Flame retardant rating | ++ | +++ |
| Mechanical life | ++ | +++ |
| Minimum operating temperature | +++ | +++ |
| Impact resistance | + | ++++ |
| Light weight of product with same capacity | ++ | ++++ |
| Environment-friendly production | + | +++ |
| Reduction of CO2Discharging | ++ | +++++ |
| The material can be recovered | 0 | +++ |
The following conclusions can be drawn from table 2: compared with the traditional epoxy resin curing system (APGE), the thermoplastic composite material (PT) obtained in the embodiment 1 is applied to the electrical insulation products, and the electrical insulation products have obvious performance advantages which are mainly shown in that: the strength of the glass fiber in the direction is improved; secondly, the strength is improved at high temperature; the creep resistance is improved; fourthly, the paint is resistant to special environments, such as: ultraviolet rays, high temperature and the like, and the performance is obviously improved; the impact resistance and the thermal shock resistance are good; sixthly, fatigue resistance is improved: and improving flame retardance.
3. The thermoplastic composite (PT) obtained in example 1 was subjected to a model test
(1) Insulation test
1) The insulation level. A12 kV thermoplastic engineering plastic solid-sealed pole high-voltage circuit breaker adopts a handcart type, an insulating sleeve of a handcart contact arm of the handcart type and thermoplastic engineering plastic materials. The rated insulation level of the circuit breaker is tested according to a short-time power frequency withstand voltage 48kV test and a lightning impulse withstand voltage 85kV test.
2) Creepage distance of the insulation member. According to the insulation level requirement of a 12kV high-voltage switch cabinet, the creepage specific distance of insulation parts such as a thermoplastic engineering plastic contact box, a wall bushing contact box and the like is designed according to 25mm/kV when the insulation parts are designed, and the matching use of the insulation parts and the high-voltage switch cabinet is allowed to be considered. A 15% margin was designed.
3) The structural design of the high-voltage switch cabinet and the high-voltage switch cabinet taking air as an insulating medium, the air clear distance between conductors of all phases and between the conductors of all phases and the ground in the high-voltage switch cabinet are important data influencing the rated insulation level of high-voltage switch equipment. According to the design specification of a 12kV high-voltage switch cabinet, the air clear distance in the cabinet is more than 125mm, and an insulation degree of 5% insulation is reserved in the design.
After the 12kV thermoplastic engineering plastic insulating material switch cabinet and the break junction distribution cabinet are tested, the short-time power frequency withstand voltage is alternate and meets 4kV to the ground, the isolation fracture meets 48kV, the lightning impulse withstand voltage test is alternate and meets 75kV to the ground, and the isolation fracture meets 85 kV.
The contact box and the circuit breaker contact arm are matched, so that the insulation performance is weakest, and particularly, the lightning impulse test is carried out. Through the structural design of the contact arm insulating part of the circuit breaker and the structural design of the contact box, the creepage distance is increased, and a good insulating effect can be obtained.
(2) Partial discharge test
Partial discharge can cause the influence that insulating properties descends to insulating medium and insulating part, in air insulation high tension switchgear, because the components and parts type is many, and the structure is complicated, and electric field distribution is inhomogeneous in the cabinet, so the rational arrangement of components and parts must be considered in high tension switchgear's structural design, considers under long-term operating voltage's effect, does not allow to take place great partial discharge in the insulation.
According to practical application, the thermoplastic engineering plastic solid-sealed polar pole and the insulating part belong to one-step injection molding, the production efficiency is high, the product weight is light, the wall thickness of the insulating part is uniform and light, the internal defects are few, and the influence on the local discharge capacity is very small. The local discharge capacity of the circuit breaker embedded pole is less than 5pC (1.3Ue), the local discharge capacity of a single insulating part is less than 2pC (1.3Ue), and the local discharge capacity of the switch cabinet is less than 15pC (1.1 Ue).
(3) Mechanical testing
The core performance of the high-voltage switch cabinet is the verification of the structural design rationality of the switch equipment and the material strength of parts, and the damage to the high-voltage switch cabinet, caused by the fact that whether the circuit breaker seals a pole and an insulating part in the cabinet can meet the requirements of normal mechanical operation is very critical. According to the GB3906-2006 and GB1984-2008 standards, the mechanical test of the switchgear mainly comprises a mechanical operation test and a mechanical life test of a matched circuit breaker. Mechanical operation tests and breaker mechanical life tests provide tests on the strength and fatigue deformation of the thermoplastic engineering plastic insulating part under repeated action stress and vibration. Particularly, the closing and opening operation impact force of the circuit breaker puts requirements on the mechanical strength of insulating parts such as a circuit breaker solid-sealed pole, a contact box, a sleeve, the contact box and the like. After the test is finished, the solid-sealed polar pole and the insulating part of the circuit breaker are not cracked, and the insulating property meets the rated insulating level value and is not influenced.
(4) Short time withstand current and peak withstand current tests
The test verifies that the thermoplastic engineering plastic embedded pole and the insulating part have instantaneous thermal expansion deformation and electric power damage during fault current. The contact box of the solid-sealed polar pole of the circuit breaker mainly bears the influence of thermal deformation and electrodynamic force damage, and the contact box mainly bears the influence of electrodynamic force damage. According to practical application, the thermoplastic engineering plastic insulating material has good heat resistance, mechanical strength and electrical insulation performance, and can completely meet the test requirements of rated short-time withstand current and peak withstand current of the switch cabinet through the structural design of the circuit breaker embedded pole and the cabinet internal insulating part. In addition, the influence rule of the electrodynamic force on the switch cabinet can be mastered by comprehensively considering the aspects of primary loop elements, conductor trend, electrical connection structures and the like in the switch cabinet, and the damage of the electrodynamic force on insulation parts and structures in the cabinet can be overcome and reduced through reasonable structural arrangement.
(5) Electric life test
The electrical life test of the circuit breaker of the high-voltage switch cabinet made of the thermoplastic engineering plastic insulating material is a severe examination. According to the GB1984-2008 standard, an electric service life test requires that a breaker needs to complete a specified breaking test current operation sequence and times without intermediate overhaul. In the whole test process, a large short-circuit current exists in a main loop of the switch equipment, an arc extinguish chamber of the circuit breaker can generate electric intensity, and the influence of the whole switching process on the switch equipment is mainly shown in the aspect 2, namely, the thermal effect and the force effect thermal effect can cause the insulation performance of an insulating part of the switch equipment to be reduced, and the force effect can cause the insulating part in a switch equipment cabinet to be deformed or even damaged.
The 12kV thermoplastic engineering plastic insulating material switch cabinet has the advantages that the electrical life of a circuit breaker is 30 times of full load disconnection according to the E2 level. The requirements on the mechanical property and the insulating property of the thermoplastic engineering plastic insulating parts such as the circuit breaker solid-sealed pole, the contact box in the cabinet, the wall bushing contact box and the like are high.
(6) Temperature rise test
The rated current of the 12kV thermoplastic engineering plastic insulating material switch cabinet is 1250A, and the temperature rise is 1.1x 1250A. According to practical use, the thermoplastic engineering plastic insulating part has specific advantages in the temperature rise test of the switch equipment. Taking the thermoplastic engineering plastic contact box as an example, compared with the traditional epoxy resin insulating part, the thermoplastic engineering plastic contact box has the advantages of larger heat conductivity coefficient than epoxy resin and self-superior processability. Under the requirement of the same creepage distance, the weight and the volume can be reduced by 60%, the wall thickness of the insulating part is greatly reduced, the conduction and convection of the heat inside the contact box and the ambient air are increased, and a good effect is shown in a temperature rise test of the switch equipment. According to test data, the temperature rise value of the thermoplastic engineering plastic insulating part can be reduced by 2-5K compared with that of an epoxy resin insulating part under the same technical parameter condition.
(7) Heat aging Performance test
The thermal aging performance of the thermoplastic engineering plastic used as the main insulating material of the high-voltage switch cabinet is a key technical index accepted by power users in the future and the occurrence of the thermal aging phenomenon of the product, so that the performance of the product is irreversibly changed. The test data can be obtained in a laboratory through a test stage of a specified program, and the operation data can be obtained only after long-term tracking, recording, analysis and verification.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A preparation method of a 12kV green environment-friendly energy-saving contact box is characterized by comprising the following steps:
step one, preparing materials: preparing raw materials PA66-GF30, reinforced composite formula materials accounting for 3-8% of the weight of the raw materials, toner or color master batch accounting for 1-5% of the weight of the raw materials and white oil accounting for 1-2% of the weight of the raw materials;
step two, stirring: pouring the raw materials into a stirrer, adding white oil, fully and uniformly stirring, sequentially adding the reinforced composite material and the toner or color master, and stirring to obtain a mixture;
step three, drying materials: placing the mixture in a drying oven or automatically loading the mixture into a charging basket of equipment to be dried to obtain a thermoplastic composite material;
step four, production: and adding the thermoplastic composite material into a corresponding injection mold, and performing injection molding after an insert is additionally arranged in the injection mold.
2. The method for preparing the 12kV environment-friendly energy-saving contact box according to claim 1, wherein the reinforced composite formula material in the first step is a toughening agent and a defoaming agent.
3. The preparation method of the 12kV environment-friendly energy-saving contact box according to claim 1, wherein in the second step, forward and reverse rotation is alternately stirred for more than forty minutes, and the stirring speed is 60-80 rpm.
4. The preparation method of the 12kV environment-friendly energy-saving contact box according to claim 1, wherein the drying temperature is set to 120 ℃ in the third step, and the continuous drying is carried out for 6 to 8 hours.
5. The preparation method of the 12kV environment-friendly energy-saving contact box according to any one of claims 1 to 4, wherein the injection parameters in the fourth step are as follows: the mold locking pressure is 20MPa-85MPa, and the mold locking speed is 20 mm/s; the die opening pressure is as follows: 35MPa-60MPa, and the die opening speed is 30 mm/S; the mold closing, filling, pressure maintaining, glue returning, cooling, mold opening and demolding temperatures are as follows in sequence: 300 ℃, 280 ℃, 265 ℃, 260 ℃, 255 ℃, 245 ℃ and 235 ℃.
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| CN102601914A (en) * | 2012-02-21 | 2012-07-25 | 北京汽车股份有限公司 | Method for manufacturing handle base of car door |
| CN104861644A (en) * | 2015-05-25 | 2015-08-26 | 江苏南瑞泰事达电气有限公司 | Recoverable flame-retardant insulating modified material, and preparation and application of insulating parts |
| CN105098638A (en) * | 2015-07-28 | 2015-11-25 | 江苏南瑞泰事达电气有限公司 | 12kV switch cabinet |
| CN111171557A (en) * | 2020-01-14 | 2020-05-19 | 株洲时代工程塑料科技有限责任公司 | Continuous fiber reinforced polyamide composite material and preparation method and application thereof |
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2020
- 2020-11-30 CN CN202011371593.4A patent/CN112677530A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601914A (en) * | 2012-02-21 | 2012-07-25 | 北京汽车股份有限公司 | Method for manufacturing handle base of car door |
| CN104861644A (en) * | 2015-05-25 | 2015-08-26 | 江苏南瑞泰事达电气有限公司 | Recoverable flame-retardant insulating modified material, and preparation and application of insulating parts |
| CN105098638A (en) * | 2015-07-28 | 2015-11-25 | 江苏南瑞泰事达电气有限公司 | 12kV switch cabinet |
| CN111171557A (en) * | 2020-01-14 | 2020-05-19 | 株洲时代工程塑料科技有限责任公司 | Continuous fiber reinforced polyamide composite material and preparation method and application thereof |
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