阅读说明：本技术 一种耐高温型断路器外壳 (High temperature resistant type circuit breaker shell ) 是由 朱晓宏 朱家俊 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种耐高温型断路器外壳,制备方法为：1)配置马来酸、对苯二甲酸二钠盐和L-苯丙氨酸的混合水溶液,煮沸,加入己二胺,然后迅速将混合水溶液置于密封容器内,氮气氛围中搅拌,搅拌过程中对混合物升温至300～350℃保温5～10min；2)保温结束后将容器内混合物的温度冷却至120～130℃,流动氮气带出容器内的水相,混合物恒重后向容器内加入添加剂A和添加剂B,加料过程中持续搅拌混合物；3)加料完成后混合物加热至250～260℃范围内继续保温2～2.5h,混合物在氮气氛围中再次升温至300～350℃,保温5min以上,然后通过注射成型,冷却,获得所述断路器外壳。本发明改进了断路器外壳的制备方法,所制得的外壳耐热性能良好,表现为较高的热变形温度。(The invention discloses a high-temperature-resistant circuit breaker shell, which is prepared by the following steps: 1) preparing a mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine, boiling, adding hexamethylene diamine, quickly placing the mixed aqueous solution into a sealed container, stirring in a nitrogen atmosphere, heating the mixture to 300-350 ℃ during stirring, and keeping the temperature for 5-10 min; 2) after the heat preservation is finished, cooling the temperature of the mixture in the container to 120-130 ℃, taking the flowing nitrogen out of the water phase in the container, adding the additive A and the additive B into the container after the mixture is constant in weight, and continuously stirring the mixture in the feeding process; 3) and after the feeding is finished, heating the mixture to 250-260 ℃, continuously preserving heat for 2-2.5 h, heating the mixture to 300-350 ℃ again in a nitrogen atmosphere, preserving heat for more than 5min, and then performing injection molding and cooling to obtain the shell of the circuit breaker. The invention improves the preparation method of the breaker shell, and the prepared shell has good heat resistance and shows higher thermal deformation temperature.)

1. The shell of the high-temperature-resistant circuit breaker is characterized in that the preparation method of the shell comprises the following steps:

1) preparing a mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine, boiling the mixed aqueous solution, adding hexamethylene diamine, quickly placing the mixed aqueous solution into a sealed container, sealing the container, replacing air in the container with nitrogen, magnetically stirring the mixture in the container, and heating the mixture to 300-350 ℃ in the stirring process and preserving the temperature for 5-10 min;

2) after the heat preservation is finished, cooling the temperature of the mixture in the container to 120-130 ℃, taking the flowing nitrogen out of the water phase in the container, adding the additive A and the additive B into the container after the mixture is constant in weight, and continuously stirring the mixture in the feeding process;

3) after the feeding is finished, heating the mixture to a temperature of 250-260 ℃, continuously preserving heat for 2-2.5 h, continuously stirring the mixture in the heat preservation process, stopping stirring after the heat preservation is finished, heating the mixture to 300-350 ℃ again in a nitrogen atmosphere, preserving heat for more than 5min, and then performing injection molding and cooling to obtain the shell of the circuit breaker;

the preparation method of the additive A comprises the following steps: preparing aqueous solutions of cerium nitrate and stannous chloride, carrying out water bath constant temperature on the aqueous solutions of cerium nitrate and stannous chloride to 50-60 ℃, carrying out heat preservation, adding diisopropanolamine into the solution in the heat preservation process, continuously stirring the solution in the feeding process, continuously stirring the solution at constant temperature for 5-10 min after the feeding is finished, then adding oxalic acid and sodium pyrophosphate, uniformly stirring, and separating a solid phase to obtain the additive A;

the preparation method of the additive B comprises the following steps:

(1) ball-milling antimony oxide powder, screening the ball-milled powder through a 1500-mesh screen, collecting the screened powder, washing the screened powder with acetone for 2-3 times, and drying;

(2) preparing an aqueous solution of sodium hydroxide and sodium alginate, soaking the dried powder in the aqueous solution of sodium hydroxide and sodium alginate to form a mixture, placing the mixture in a closed container, heating the mixture to 140-160 ℃, preserving the heat for 30-40 h, cooling in air to normal temperature, filtering, and drying the solid phase to obtain a solid phase C;

(3) mixing the solid phase C with trimethylolpropane and diethyl phosphite, heating the mixture to 160-180 ℃, preserving heat for 20-30 h, cooling the mixture to 80-90 ℃ after heat preservation, preserving heat and steaming until the mass of the mixture is constant, air-cooling the mixture to normal temperature, performing solid-liquid separation to remove the solid phase, and collecting the liquid phase to obtain the additive B.

2. The high temperature resistant circuit breaker housing of claim 1, wherein the concentration of each component in the mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine is as follows: 10-20 g/100mL of maleic acid, 0.6-1.2 g/100mL of disodium terephthalate, 1.2-1.7 g/100mL of L-phenylalanine, and the balance of water; the mass of the added hexamethylene diamine/volume ratio of the mixed aqueous solution is = 8-15 g/100 mL.

3. The high temperature resistant type circuit breaker casing according to claim 1, wherein the mass ratio of the added mass of the additive A and the additive B to the mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine is:

mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine: additive A: the additive B =10: 0.3-0.6: 2-4.

4. The casing of the high-temperature resistant circuit breaker according to claim 1, wherein the concentration of each component in the aqueous solution of cerium nitrate and stannous chloride is as follows: 10-20 g/500mL of cerium nitrate, 6-8 g/500mL of stannous chloride and the balance of water; the adding mass of diisopropanolamine/the volume of the aqueous solution of cerium nitrate and stannous chloride = 30-50 g/500mL, and the adding mass of oxalic acid and sodium pyrophosphate/the volume of the aqueous solution of cerium nitrate and stannous chloride are respectively as follows:

the volume of the aqueous solution of oxalic acid/cerium nitrate and stannous chloride is = 10-20 g/500 mL;

the volume of the aqueous solution of sodium pyrophosphate/cerium nitrate and stannous chloride is = 2-4 g/500 mL.

5. The housing of a high temperature resistant circuit breaker as claimed in claim 1, wherein the concentration of each component in the aqueous solution of sodium hydroxide and sodium alginate is: 10-40 g/500mL of sodium hydroxide, 3-7 g/500mL of sodium alginate and the balance of water; the mass of the aqueous solution of the sodium hydroxide and the sodium alginate is more than 7 times of the mass of the antimony oxide powder added into the aqueous solution.

6. The casing of the high temperature resistant circuit breaker according to claim 1, wherein the solid phase C, the trimethylolpropane and the diethyl phosphite are mixed in a mass ratio of:

solid phase C: trimethylolpropane: diethyl phosphite = 0.1-0.5: 2: 2-4.

Technical Field

The invention belongs to the technical field of power grid equipment, and particularly relates to a high-temperature-resistant circuit breaker shell.

Background

The over-high temperature rise is a great problem in the miniaturization development process of the miniature circuit breaker, and the product temperature rise under the maximum rated current is difficult to further reduce under the condition of not increasing the overall dimension of the circuit breaker according to the conventional method. The circuit breaker generally comprises a shell, an operating mechanism, a magnetic system, a thermal system, a wiring terminal and an arc extinguishing chamber. The temperature rise of the circuit breaker is mainly that the thermal resistance (conductor resistance and contact resistance) of the conductive loop generates heat in the electrifying process, and meanwhile, the heat of the electrifying loop in the closed shell space is difficult to dissipate, so that the heat of the circuit breaker is gathered to generate overhigh temperature, and potential safety hazards are possibly caused. The limitation on the temperature rise is an important indicator of the design of the circuit breaker. At present, a shell of a circuit breaker is generally made of thermoplastic plastics or thermosetting plastics through injection or compression molding, but the heat dissipation performance and the heat resistance performance of the current thermoplastic plastics or thermosetting plastics are insufficient, so that the potential safety hazard is large under severe environment conditions such as high temperature.

Disclosure of Invention

In order to solve the technical problem, the invention provides a high-temperature resistant breaker shell, and a preparation method of the shell comprises the following steps:

1) preparing a mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine, boiling the mixed aqueous solution, adding hexamethylene diamine, quickly placing the mixed aqueous solution into a sealed container, sealing the container, replacing air in the container with nitrogen, magnetically stirring the mixture in the container, and heating the mixture to 300-350 ℃ in the stirring process and preserving the temperature for 5-10 min;

2) after the heat preservation is finished, cooling the temperature of the mixture in the container to 120-130 ℃, taking the flowing nitrogen out of the water phase in the container, adding the additive A and the additive B into the container after the mixture is constant in weight, and continuously stirring the mixture in the feeding process;

3) after the feeding is finished, heating the mixture to a temperature of 250-260 ℃, continuously preserving heat for 2-2.5 h, continuously stirring the mixture in the heat preservation process, stopping stirring after the heat preservation is finished, heating the mixture to 300-350 ℃ again in a nitrogen atmosphere, preserving heat for more than 5min, and then performing injection molding and cooling to obtain the shell of the circuit breaker;

the preparation method of the additive A comprises the following steps: preparing aqueous solutions of cerium nitrate and stannous chloride, carrying out water bath constant temperature on the aqueous solutions of cerium nitrate and stannous chloride to 50-60 ℃, carrying out heat preservation, adding diisopropanolamine into the solution in the heat preservation process, continuously stirring the solution in the feeding process, continuously stirring the solution at constant temperature for 5-10 min after the feeding is finished, then adding oxalic acid and sodium pyrophosphate, uniformly stirring, and separating a solid phase to obtain the additive A;

the preparation method of the additive B comprises the following steps:

(1) ball-milling antimony oxide powder, screening the ball-milled powder through a 1500-mesh screen, collecting the screened powder, washing the screened powder with acetone for 2-3 times, and drying;

(2) preparing an aqueous solution of sodium hydroxide and sodium alginate, soaking the dried powder in the aqueous solution of sodium hydroxide and sodium alginate to form a mixture, placing the mixture in a closed container, heating the mixture to 140-160 ℃, preserving the heat for 30-40 h, cooling in air to normal temperature, filtering, and drying the solid phase to obtain a solid phase C;

(3) mixing the solid phase C with trimethylolpropane and diethyl phosphite, heating the mixture to 160-180 ℃, preserving heat for 20-30 h, cooling the mixture to 80-90 ℃ after heat preservation, preserving heat and steaming until the mass of the mixture is constant, air-cooling the mixture to normal temperature, performing solid-liquid separation to remove the solid phase, and collecting the liquid phase to obtain the additive B.

Further, the concentration of each component in the mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine is as follows: 10-20 g/100mL of maleic acid, 0.6-1.2 g/100mL of disodium terephthalate, 1.2-1.7 g/100mL of L-phenylalanine, and the balance of water; the mass of the added hexamethylene diamine/volume ratio of the mixed aqueous solution is = 8-15 g/100 mL.

Further, the mass ratio of the added mass of the additive A and the additive B to the mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine is as follows:

mixed aqueous solution of maleic acid, disodium terephthalate and L-phenylalanine: additive A: the additive B =10: 0.3-0.6: 2-4.

Further, in the aqueous solution of cerium nitrate and stannous chloride, the concentration of each component is as follows: 10-20 g/500mL of cerium nitrate, 6-8 g/500mL of stannous chloride and the balance of water; the adding mass of diisopropanolamine/the volume of the aqueous solution of cerium nitrate and stannous chloride = 30-50 g/500mL, and the adding mass of oxalic acid and sodium pyrophosphate/the volume of the aqueous solution of cerium nitrate and stannous chloride are respectively as follows:

the volume of the aqueous solution of oxalic acid/cerium nitrate and stannous chloride is = 10-20 g/500 mL;

the volume of the aqueous solution of sodium pyrophosphate/cerium nitrate and stannous chloride is = 2-4 g/500 mL.

Further, the concentration of each component in the aqueous solution of sodium hydroxide and sodium alginate is as follows: 10-40 g/500mL of sodium hydroxide, 3-7 g/500mL of sodium alginate and the balance of water; the mass of the aqueous solution of the sodium hydroxide and the sodium alginate is more than 7 times of the mass of the antimony oxide powder added into the aqueous solution.

Further, the mixing mass ratio of the solid phase C, the trimethylolpropane and the diethyl phosphite is as follows:

solid phase C: trimethylolpropane: diethyl phosphite = 0.1-0.5: 2: 2-4.

Therefore, the beneficial effects of the invention are as follows: the invention improves the preparation method of the breaker shell, and the prepared shell has good heat resistance, higher thermal deformation temperature, wide application prospect in severe environment conditions such as high temperature and the like and higher safety coefficient.

Drawings

Fig. 1 is a graph comparing heat distortion temperatures of circuit breaker housings prepared in respective examples and comparative examples.

Detailed Description

The following is a detailed description with reference to examples: