阅读说明：本技术 一种可熔融再成型线材工业化生产方法 (Industrial production method of meltable remolded wire ) 是由 杜倩 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种可熔融再成型线材工业化生产方法,其特征在于包括如下步骤：1)将芳香族聚碳酸酯、3-(3,5-二叔丁基-4-羟基苯基)丙烯酸异辛酯,六氢邻苯二甲酸酐,按比例称取各原料,备用；2)将芳香族聚碳酸酯,3-(3,5-二叔丁基-4-羟基苯基)丙烯酸异辛酯在单螺杆挤出机中挤出得到预制混合料；3)将预制混合料进行脱水、筛分,除杂；加热至70℃后,加入六氢邻苯二甲酸酐,进行混合,得到混合料；4)对所述的混合料在单螺杆挤出机中进行渗透、扩散、挤出、冷却,得到线材。(The invention discloses an industrial production method of a meltable remolded wire, which is characterized by comprising the following steps: 1) weighing the raw materials of aromatic polycarbonate, 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate and hexahydrophthalic anhydride according to a proportion for later use; 2) extruding aromatic polycarbonate and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate in a single-screw extruder to obtain a prefabricated mixture; 3) dehydrating, screening and removing impurities from the prefabricated mixture; heating to 70 ℃, adding hexahydrophthalic anhydride, and mixing to obtain a mixture; 4) and (3) performing permeation, diffusion, extrusion and cooling on the mixture in a single-screw extruder to obtain the wire rod.)

1. An industrial production method of a melt-remoldable wire rod is characterized by comprising the following steps:

1) weighing the raw materials of aromatic polycarbonate, 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate and hexahydrophthalic anhydride according to a proportion for later use;

2) extruding aromatic polycarbonate and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate in a single-screw extruder to obtain a prefabricated mixture;

3) dehydrating, screening and removing impurities from the prefabricated mixture; heating to 70 ℃, adding hexahydrophthalic anhydride, and mixing to obtain a mixture;

4) and (3) performing permeation, diffusion, extrusion and cooling on the mixture in a single-screw extruder to obtain the wire rod.

2. The industrial production method according to claim 1, wherein the raw materials comprise 100 parts of aromatic polycarbonate, 0.1 to 1 part of isooctyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate, and 1 to 5 parts of hexahydrophthalic anhydride.

3. The industrial production method according to claim 1, wherein the raw materials are selected from the group consisting of 100 parts of aromatic polycarbonate, 0.2 part of isooctyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate, and 2 parts of hexahydrophthalic anhydride.

4. The industrial process according to claim 1, wherein the aromatic polycarbonate is 2, 2' -bis (4-hydroxyphenyl) propane polycarbonate.

5. The industrial process according to claim 1, wherein the single screw extruder is operated in the following conditions: the rotating speed is 400rpm, the screw temperature is 110 ℃, the barrel temperature is 120 ℃, the rotating speed of the melt pump is 50rpm, the melt pump temperature is 150 ℃, the melt pump outlet pressure is 160bar, the flange temperature is 150 ℃, the screen changer temperature is 150 ℃, and the melt temperature is 160 ℃.

6. The industrial production method according to claim 1, wherein the screening is performed in a single screw extruder, specifically, 3 layers of filter screens are additionally arranged in the single screw extruder, the number of the high-precision filter screens in the additionally arranged 3 layers of filter screens is 500 meshes, and the temperature of the granulating template is 200 ℃.

7. The industrial production method according to claim 1, wherein the steps of dehydrating, screening and removing impurities comprise: and (3) pressurizing and conveying the prefabricated mixture to a dehydrator through a closed circulating water system, dehydrating through the dehydrator, sieving and granulating abnormal particles through a vibrating screen, vertically dropping the prefabricated mixture into a buffer bin and a weighing bin, heating the prefabricated mixture to 70 ℃ through a fluidized bed, and removing impurities through a cyclone separator.

8. The industrial production method of claim 1, wherein the mixing is carried out at a mixing system speed of 5rpm and a temperature of 70 ℃ for 800s until the surface of the pre-prepared mixture is dried.

9. The industrial production method according to claim 1,

1) weighing each raw material according to 100 parts of aromatic polycarbonate, 0.2 part of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate and 2 parts of hexahydrophthalic anhydride for later use;

2) adding the aromatic polycarbonate weighed in the step 1 and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate into a reciprocating single-screw extruder through an automatic feeding device and a vector weighing feeding system, adjusting the rotating speed of a reciprocating screw to be 400rpm, the temperature of the screw to be 110 ℃, the temperature of a machine barrel to be 120 ℃, the rotating speed of a melt pump to be 50rpm, the temperature of the melt pump to be 150 ℃, the pressure of the outlet of the melt pump to be 160bar, the temperature of a flange to be 150 ℃, the temperature of a screen changer to be 150 ℃, the temperature of the melt to be 160 ℃, additionally installing 3 layers of filter screens, wherein the mesh number of high-precision filter screens in the additionally installed 3 layers of filter screens is 500 meshes, cutting a die plate to be 200;

3) feeding the aromatic polycarbonate prefabricated mixture added with 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate to a dehydrator through a closed circulating water system under pressure, dehydrating through the dehydrator, sieving and granulating abnormal particles through a vibrating screen, vertically dropping the prefabricated mixture into a buffer bin and a weighing bin, heating the prefabricated mixture to 70 ℃ through a fluidized bed, removing impurities through a cyclone separator, feeding the prefabricated mixture into a hexahydrophthalic anhydride mixing system, adding 70 ℃ hexahydrophthalic anhydride into the prefabricated mixture, controlling the rotating speed of the mixing system to be 5rpm and the temperature to be 70 ℃, and mixing for 800s until the surface of the mixture is dried to obtain a mixture;

4) and vertically dropping the mixture into a single-screw extruder, carrying out heat preservation, permeation, diffusion, extrusion and cooling to obtain a wire rod, wherein the heat preservation temperature is 70 ℃, the heat preservation time is 12 hours, nitrogen protection is carried out in the permeation and diffusion processes, the nitrogen pressure is 0.1Mpa, and the wire rod is extruded and cooled to obtain the melt remolding wire rod.

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to an industrial production method of a meltable remolded wire.

Background

Polycarbonate (abbreviated as PC in english) is a high molecular polymer containing carbonate groups in its molecular chain, and is classified into various types such as aliphatic, aromatic, aliphatic-aromatic, and the like, depending on the structure of the ester groups.

The polycarbonate is used as an engineering plastic with high strength, high impact resistance, high wear resistance and excellent performance, and is widely applied to the fields of automobiles, household appliances, electronic and electric appliances, illumination, medical treatment and the like.

The PC has excellent mechanical property, extremely high transparency and wear resistance, but the PC as a melt remolding wire has high melt viscosity and difficult molecular chain movement, the molecular chain cannot be diffused in time easily due to cooling of the wire extruded from a melt nozzle, so that stress concentration is caused, and printing warping shrinkage occurs. How to achieve no shrinkage of PC in melt remolding has become a hot issue for material researchers.

Disclosure of Invention

The target purposes are as follows: aiming at the defects in the prior art, the invention provides an industrial production method of the meltable remolded wire, the meltable remolded wire can be efficiently produced by adopting the method, and meanwhile, the wire has better remolding shrinkage rate.

The technical scheme is as follows: the industrial production method of the melt-remoldable wire rod comprises the following steps:

1) weighing the raw materials of aromatic polycarbonate, 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate and hexahydrophthalic anhydride according to a proportion for later use;

2) extruding aromatic polycarbonate and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate in a single-screw extruder to obtain a prefabricated mixture;

3) dehydrating, screening and removing impurities from the prefabricated mixture; heating to 70 ℃, adding hexahydrophthalic anhydride, and mixing to obtain a mixture;

4) and (3) performing permeation, diffusion, extrusion and cooling on the mixture in a single-screw extruder to obtain the wire rod.

The raw materials comprise 100 parts of aromatic polycarbonate, 0.1-1 part of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate and 1-5 parts of hexahydrophthalic anhydride. Preferably, the raw materials of the invention comprise 100 parts of aromatic polycarbonate, 0.2 part of isooctyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate and 2 parts of hexahydrophthalic anhydride.

Specifically, the aromatic polycarbonate is 2, 2' -bis (4-hydroxyphenyl) propane polycarbonate.

Specifically, the working conditions of the single-screw extruder are as follows: the rotating speed is 400rpm, the screw temperature is 110 ℃, the barrel temperature is 120 ℃, the rotating speed of the melt pump is 50rpm, the melt pump temperature is 150 ℃, the melt pump outlet pressure is 160bar, the flange temperature is 150 ℃, the screen changer temperature is 150 ℃, and the melt temperature is 160 ℃.

Specifically, the screening is carried out in a single screw extruder, specifically, 3 layers of filter screens are additionally arranged in the single screw extruder, the number of the high-precision filter screens in the additionally arranged 3 layers of filter screens is 500 meshes, and the temperature of a granulating template is 200 ℃.

Specifically, the method comprises the following steps of dehydration, screening and impurity removal: and (3) pressurizing and conveying the prefabricated mixture to a dehydrator through a closed circulating water system, dehydrating through the dehydrator, sieving and granulating abnormal particles through a vibrating screen, vertically dropping the prefabricated mixture into a buffer bin and a weighing bin, heating the prefabricated mixture to 70 ℃ through a fluidized bed, and removing impurities through a cyclone separator.

Specifically, the mixing is carried out by controlling the rotating speed of a mixing system to be 5rpm and the temperature to be 70 ℃ and mixing for 800s until the surface of the prefabricated mixture is dried.

Further, a typical scheme of the present invention is:

1) weighing each raw material according to 100 parts of aromatic polycarbonate, 0.2 part of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate and 2 parts of hexahydrophthalic anhydride for later use;

2) adding the aromatic polycarbonate weighed in the step 1 and 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate into a reciprocating single-screw extruder through an automatic feeding device and a vector weighing feeding system, adjusting the rotating speed of a reciprocating screw to be 400rpm, the temperature of the screw to be 110 ℃, the temperature of a machine barrel to be 120 ℃, the rotating speed of a melt pump to be 50rpm, the temperature of the melt pump to be 150 ℃, the pressure of the outlet of the melt pump to be 160bar, the temperature of a flange to be 150 ℃, the temperature of a screen changer to be 150 ℃, the temperature of the melt to be 160 ℃, additionally installing 3 layers of filter screens, wherein the mesh number of high-precision filter screens in the additionally installed 3 layers of filter screens is 500 meshes, cutting a die plate to be 200;

3) feeding the aromatic polycarbonate prefabricated mixture added with 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl acrylate to a dehydrator through a closed circulating water system under pressure, dehydrating through the dehydrator, sieving and granulating abnormal particles through a vibrating screen, vertically dropping the prefabricated mixture into a buffer bin and a weighing bin, heating the prefabricated mixture to 70 ℃ through a fluidized bed, removing impurities through a cyclone separator, feeding the prefabricated mixture into a hexahydrophthalic anhydride mixing system, adding 70 ℃ hexahydrophthalic anhydride into the prefabricated mixture, controlling the rotating speed of the mixing system to be 5rpm and the temperature to be 70 ℃, and mixing for 800s until the surface of the mixture is dried to obtain a mixture;

4) and vertically dropping the mixture into a single-screw extruder, carrying out heat preservation, permeation, diffusion, extrusion and cooling to obtain a wire rod, wherein the heat preservation temperature is 70 ℃, the heat preservation time is 12 hours, nitrogen protection is carried out in the permeation and diffusion processes, the nitrogen pressure is 0.1Mpa, and the wire rod is extruded and cooled to obtain the melt remolding wire rod.

Has the advantages that: the production method provided by the invention is simple and efficient. The product obtained by the method has better melt fluidity and better shrinkage.

The product produced by the method has the melt flow rate of 15-20g/10min under the condition of 10kg/300 ℃ and the molecular weight of 200000-210000.

The specific implementation mode is as follows:

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.