A high temperature resistant and anti-aging injection molding material and its preparation method and application

Abstract

The invention relates to a high temperature resistant and anti-aging injection molding material and a preparation method and application thereof, belonging to the technical field of polymer materials. The raw material components of the injection molding material include polycarbonate, 5-phenyltetrazolyl, isooctyl thioglycolate, high silica glass fiber, extreme pressure polyurea grease, an anti-deformation modifier and coral powder; wherein the polycarbonate, high silica glass fiber and coral powder are used to prepare a master batch; the master batch and other components are uniformly and stably foamed and molded by an injection molding machine, and the obtained product solves the product deformation and shrinkage caused by large wall thickness, effectively ensures the dimensional stability; and can have good high temperature resistance and crack resistance; demoulding is smooth, and fracture during demoulding is effectively prevented, and is suitable for lamp holder products with complex structures.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high temperature resistant and anti-aging injection molding material and a preparation method and application thereof. Background Art

[0002] With the continuous development of society, plastic products have been applied to all walks of life. Plastic products are various products made of synthetic polymer compounds as the main raw materials, processed by extrusion, injection molding, blow molding, calendering or lamination, etc., used to replace wood products, metal products and stone products. According to different use environments and use requirements, various types of plastic products have different characteristics, such as compression resistance, crack resistance, high temperature resistance, low temperature resistance, aging resistance, deformation ability, thermal insulation, sound insulation, flame retardancy, etc.

[0003] Among them, the injection molding method for preparing plastic products has the following advantages: simple equipment, and production can be achieved using an injection molding machine; it can produce thick products, such as lamp holder injection molding products, which are usually more than 10mm thick. However, due to the complex structure of the lamp holder, the thickness of each part is different, and the structure has corners at various angles, so the injection molding preparation of lamp holder products still has the following technical bottlenecks:

[0004] 1. Complex structure and long product molding cycle;

[0005] 2. The thickness is large and varies, and there are various angle designs, so the wall thickness is prone to shrinkage during the molding process;

[0006] 3. The product is prone to deformation during injection molding at high temperature and high humidity;

[0007] 4. The thickness is large, which causes large internal stress and is prone to cracking;

[0008] 5. Parts of the mold are prone to sticking and breaking during demoulding.

[0009] The above technical bottlenecks will lead to low injection molding yield and poor adaptability of installed lamps and accessories. In addition, the lamp holder is used in an environment where it is exposed to high temperature and light for a long time, so it is necessary to ensure high temperature resistance and anti-aging, prevent high temperature softening, deformation and powdering, and increase the service life of the lamp holder products. Therefore, the preparation technology of the lamp holder needs to be continuously improved to meet the requirements of higher yield and longer service life. Summary of the invention

[0010] In view of the above technical problems existing in the existing injection-molded lamp holders, the present invention provides a high-temperature resistant and anti-aging injection molding material and its preparation method and application. The injection molding material uses polycarbonate, 5-phenyltetrazolyl, isooctyl thioglycolate, high-silica glass fiber, extreme pressure polyurea grease, anti-deformation modifier and coral powder as raw materials, and uses an injection molding machine for uniform and stable foaming molding. The obtained product solves the product deformation and shrinkage caused by large wall thickness, effectively ensures dimensional stability, and has good high temperature resistance and crack resistance. The demoulding is smooth, effectively preventing breakage during demoulding. The specific technical scheme is as follows:

[0011] A high temperature resistant and anti-aging injection molding material, the injection molding material is made of the following raw materials in parts by mass: 90 to 100 parts of polycarbonate, 1.8 to 2 parts of 5-phenyltetrazolyl, 0.5 to 1.5 parts of isooctyl thioglycolate, 0.5 to 2.5 parts of high silica glass fiber, 0.5 to 1.5 parts of extreme pressure polyurea grease, 1.5 to 2 parts of anti-deformation modifier and 1 to 3 parts of coral powder.

[0012] In the above technical solution, the polycarbonate has the following indicators: Rockwell hardness 118-120, melt mass flow rate 10g / min-12g / min, bending modulus greater than 200MPa, and thermal conductivity less than 0.28W / (m·K).

[0013] In the above technical solution, the indicators of the high-silica glass fiber are: silica content greater than 94wt%, loss on ignition less than 7wt%, single fiber diameter of 8μm to 10μm, and length of 0.5mm to 1.5mm.

[0014] In the above technical solution, the model of the extreme pressure polyurea grease is EXLUB PG408.

[0015] In the above technical solution, the model of the anti-deformation modifier is LM902.

[0016] In the above technical solution, the median particle size of the coral powder is 50 μm to 80 μm.

[0017] The method for preparing the above-mentioned high temperature resistant and anti-aging injection molding material comprises the following steps:

[0018] S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A;

[0019] S2: According to the mass fractions, the polycarbonate and the mixture A are melted, mixed and extruded by a twin-screw extruder, air-cooled, pelletized and dried to obtain a masterbatch;

[0020] S3: uniformly mixing isooctyl thioglycolate and extreme pressure polyurea grease according to parts by mass to obtain a mixture B;

[0021] S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C;

[0022] S5: Adding mixture C and mixture B into an injection molding machine according to their mass fractions for injection molding to obtain an injection molding material product.

[0023] In S2 of the above preparation method, the smelting temperature is 220°C to 240°C; the drying temperature is 110°C to 130°C, and the drying time is 4h to 5h.

[0024] In S5 of the above preparation method, the parameters of the injection molding machine are: the barrel temperature zone is set to 270±2°C in the first temperature zone, 280±2°C in the second temperature zone, 280±2°C in the third temperature zone, and the injection head temperature is 260±2°C; the injection pressure is 75MPa~80MPa, the injection speed is 15mm / s~16mm / s, the screw speed is 55rpm~60rpm, and the cooling time is greater than 150s.

[0025] The above-mentioned high temperature resistant and anti-aging injection molding material is used as a lamp holder.

[0026] The high temperature resistant and anti-aging injection molding material provided by the present invention and its preparation method and application have the following beneficial effects compared with the prior art:

[0027] 1. The injection molding material of the present invention is prepared by foaming polycarbonate, 5-phenyltetrazolyl, isooctyl thioglycolate, high-silica glass fiber, extreme pressure polyurea grease, anti-deformation modifier and coral powder; by using a high temperature resistant resin (polycarbonate) and a high temperature resistant foaming agent (5-phenyltetrazolyl), adding various additives, and using an injection molding machine for uniform and stable foaming molding, the obtained product solves the product deformation and shrinkage caused by large wall thickness, effectively ensures dimensional stability; and can have good high temperature resistance and crack resistance.

[0028] 2. Isooctyl thioglycolate has stability and plasticizing properties, which can help improve the strength, crack resistance and high temperature resistance of the material, shorten the molding time and reduce shrinkage.

[0029] 3. High silica glass fiber is a special high silica glass fiber with high temperature resistance, high strength, excellent chemical stability and electrical insulation performance. It can withstand 1700℃ high temperature instantly and work normally in 1000℃ high temperature environment. Its strength is more than 3 times higher than that of general high silica glass fiber, with good crack resistance, excellent chemical stability and electrical insulation, and good safety.

[0030] 4. Extreme pressure polyurea grease has a lubricating effect, promotes the composite homogeneity of materials, and can help improve various indicators, prevent the occurrence of weak points, and especially ensure the stability of the performance of the corners. Extreme pressure polyurea grease also has good antioxidant properties and anti-plastic aging; in addition, the addition of extreme pressure polyurea grease has good demoulding properties, which can smoothly demould and effectively reduce demoulding fracture.

[0031] 5. Anti-deformation modifier is a highly efficient polyolefin modifier that promotes plastic crystallization and refines the grain size, thereby improving the rigidity, surface gloss, heat deformation temperature, and deformation resistance of plastic products. It can shorten the product molding cycle, adjust and reduce the vacuum bubbles caused by thick wall thickness of product plastic parts, reduce shrinkage; improve the rigidity and surface gloss of product plastic parts.

[0032] 6. Coral powder is used as a filler to promote plastic crystallization, improve the rigidity of plastic products, and has good anti-shrinkage properties.

[0033] 7. In the preparation method, high silica glass fiber and coral powder are pre-mixed to improve the homogeneity of the masterbatch (masterbatch). The use of a twin-screw extruder can well achieve the preparation of a highly homogeneous, crack-resistant and shrinkage-resistant masterbatch.

[0034] 8. Design parameters of the injection molding machine: barrel temperature zone temperature setting first temperature zone 270±2℃, second temperature zone 280±2℃, third temperature zone 280±2℃, injection head temperature 260±2℃; injection pressure 75MPa~80MPa, injection speed 15mm / s~16mm / s, screw speed 55rpm~60rpm, cooling time greater than 150s. Low temperature injection molding can effectively shorten the injection molding cycle and reduce material shrinkage; injection molding parameters are process parameters designed according to the material composition characteristics and composition ratio, which can achieve good injection molding effect without reducing the material performance.

[0035] 9. Isooctyl thioglycolate, high-silica glass fiber, extreme pressure polyurea grease, anti-deformation modifier and coral powder have a good synergistic effect, achieving high strength, high resistance to deformation, anti-shrinkage, and high temperature resistance, achieving smooth demoulding, greatly improving the qualified rate of complex structure lamp holder products, and having good practical value. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with specific implementation cases, but the present invention is not limited to these embodiments.

[0037] Example 1

[0038] A high temperature resistant and anti-aging injection molding material, the injection molding material is made of the following raw materials in parts by mass: 95 parts of polycarbonate, 1.9 parts of 5-phenyltetrazolyl, 1 part of isooctyl thioglycolate, 1.5 parts of high silica glass fiber, 1 part of extreme pressure polyurea grease, 1.8 parts of anti-deformation modifier and 2 parts of coral powder.

[0039] Among them, the indicators of polycarbonate are: Rockwell hardness 119, melt mass flow rate 11g / min, bending modulus (50.0mm span) 218MPa, thermal conductivity 0.24W / (m·K). High silica glass fiber is high silica glass fiber of Shenzhen Xinxian Technology Co., Ltd., model XGHS-980, and the indicators of high silica glass fiber are: silica content 95wt%, ignition loss 6wt%, single fiber diameter 9μm, and length cutting treatment is 0.8mm. Extreme pressure polyurea grease is extreme pressure polyurea grease of Dongguan Excellence Chemical Technology Co., Ltd., model EXLUB PG408. Anti-deformation modifier is anti-deformation modifier of Shenzhen Qinhai Chemical Co., Ltd., model LM902. The median particle size of coral powder is 62μm.

[0040] The method for preparing the above-mentioned high temperature resistant and anti-aging injection molding material comprises the following steps:

[0041] S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A;

[0042] S2: According to the mass fraction, polycarbonate and mixture A are melted and mixed and extruded at 230° C. using a twin-screw extruder, air-cooled, pelletized, and dried at 120° C. for 4.5 h to obtain a masterbatch;

[0043] S3: uniformly mixing isooctyl thioglycolate and extreme pressure polyurea grease according to parts by mass to obtain a mixture B;

[0044] S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C;

[0045] S5: adding mixture C and mixture B into an injection molding machine according to their mass fractions for injection molding to obtain an injection molding material product;

[0046] The parameters of the injection molding machine are as follows: the barrel temperature zones are set at 270°C for the first zone, 280°C for the second zone, 280°C for the third zone, and the injection head temperature is 260°C; the injection pressure is 78MPa, the injection speed is 15mm / s, the screw speed is 58rpm, and the cooling time is 180s.

[0047] The above-mentioned high temperature resistant and anti-aging injection molding material is used as a lamp holder.

[0048] Example 2

[0049] A high temperature resistant and anti-aging injection molding material, the injection molding material is made of the following raw materials in parts by mass: 90 parts of polycarbonate, 1.8 parts of 5-phenyltetrazolyl, 0.5 parts of isooctyl thioglycolate, 0.5 parts of high silica glass fiber, 0.5 parts of extreme pressure polyurea grease, 1.5 parts of anti-deformation modifier and 1 part of coral powder.

[0050] Among them, the indicators of polycarbonate are: Rockwell hardness 118, melt mass flow rate 10g / min, bending modulus (50.0mm span) 221MPa, thermal conductivity 0.24W / (m·K). High silica glass fiber is high silica glass fiber of Shenzhen Xinxian Technology Co., Ltd., model XGHS-980, and the indicators of high silica glass fiber are: silica content 96wt%, ignition loss 5.8wt%, single fiber diameter 8μm, and length cutting treatment is 1.5mm. Extreme pressure polyurea grease is extreme pressure polyurea grease of Dongguan Excellence Chemical Technology Co., Ltd., model EXLUB PG408. Anti-deformation modifier is anti-deformation modifier of Shenzhen Qinhai Chemical Co., Ltd., model LM902. The median particle size of coral powder is 50μm.

[0051] The method for preparing the above-mentioned high temperature resistant and anti-aging injection molding material comprises the following steps:

[0052] S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A;

[0053] S2: According to the mass fraction, polycarbonate and mixture A are melted and mixed and extruded at 220° C. using a twin-screw extruder, air-cooled, pelletized, and dried at 110° C. for 4 h to obtain a masterbatch;

[0054] S3: uniformly mixing isooctyl thioglycolate and extreme pressure polyurea grease according to parts by mass to obtain a mixture B;

[0055] S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C;

[0056] S5: adding mixture C and mixture B into an injection molding machine according to their mass fractions for injection molding to obtain an injection molding material product;

[0057] The parameters of the injection molding machine are: the barrel temperature zone is set at 268°C in the first temperature zone, 278°C in the second temperature zone, 278°C in the third temperature zone, and the injection head temperature is 258°C; the injection pressure is 75MPa, the injection speed is 15mm / s, the screw speed is 55rpm, and the cooling time is 155s.

[0058] The above-mentioned high temperature resistant and anti-aging injection molding material is used as a lamp holder.

[0059] Example 3

[0060] A high temperature resistant and anti-aging injection molding material is made of the following raw materials in parts by mass: 100 parts of polycarbonate, 2 parts of 5-phenyltetrazolyl, 1.5 parts of isooctyl thioglycolate, 2.5 parts of high silica glass fiber, 1.5 parts of extreme pressure polyurea grease, 2 parts of anti-deformation modifier and 3 parts of coral powder.

[0061] Among them, the indicators of polycarbonate are: Rockwell hardness 120, melt mass flow rate 12g / min, bending modulus (50.0mm span) 208MPa, thermal conductivity 0.23W / (m·K). High silica glass fiber is high silica glass fiber of Shenzhen Xinxian Technology Co., Ltd., model XGHS-980, and the indicators of high silica glass fiber are: silica content 95wt%, ignition loss 5.5wt%, single fiber diameter 10μm, and length cutting treatment is 0.5mm. Extreme pressure polyurea grease is extreme pressure polyurea grease of Dongguan Excellence Chemical Technology Co., Ltd., model EXLUB PG408. Anti-deformation modifier is anti-deformation modifier of Shenzhen Qinhai Chemical Co., Ltd., model LM902. The median particle size of coral powder is 80μm.

[0062] The method for preparing the above-mentioned high temperature resistant and anti-aging injection molding material comprises the following steps:

[0063] S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A;

[0064] S2: According to the mass fraction, polycarbonate and mixture A are melted and mixed and extruded at 240° C. using a twin-screw extruder, air-cooled, pelletized, and dried at 130° C. for 5 h to obtain a masterbatch;

[0065] S3: uniformly mixing isooctyl thioglycolate and extreme pressure polyurea grease according to parts by mass to obtain a mixture B;

[0066] S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C;

[0067] S5: adding mixture C and mixture B into an injection molding machine according to their mass fractions for injection molding to obtain an injection molding material product;

[0068] The parameters of the injection molding machine are: the barrel temperature zone is set at 272°C in the first temperature zone, 282°C in the second temperature zone, 282°C in the third temperature zone, and the injection head temperature is 262°C; the injection pressure is 80MPa, the injection speed is 16mm / s, the screw speed is 60rpm, and the cooling time is 160s.

[0069] The above-mentioned high temperature resistant and anti-aging injection molding material is used as a lamp holder.

[0070] Example 4

[0071] A high temperature resistant and anti-aging injection molding material is made of the following raw materials in parts by mass: 90 parts of polycarbonate, 2 parts of 5-phenyltetrazolyl, 0.5 parts of isooctyl thioglycolate, 2.5 parts of high silica glass fiber, 0.5 parts of extreme pressure polyurea grease, 2 parts of anti-deformation modifier and 1 part of coral powder.

[0072] Among them, the indicators of polycarbonate are: Rockwell hardness 120, melt mass flow rate 10g / min, bending modulus (50.0mm span) 214MPa, thermal conductivity 0.25W / (m·K). High silica glass fiber is high silica glass fiber of Shenzhen Xinxian Technology Co., Ltd., model XGHS-980, and the indicators of high silica glass fiber are: silica content 96wt%, ignition loss 5.4wt%, single fiber diameter 9μm, and length cutting treatment is 0.6mm. Extreme pressure polyurea grease is extreme pressure polyurea grease of Dongguan Excellence Chemical Technology Co., Ltd., model EXLUB PG408. Anti-deformation modifier is anti-deformation modifier of Shenzhen Qinhai Chemical Co., Ltd., model LM902. The median particle size of coral powder is 54μm.

[0073] The method for preparing the above-mentioned high temperature resistant and anti-aging injection molding material comprises the following steps:

[0074] S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A;

[0075] S2: According to the mass fraction, polycarbonate and mixture A are melted and mixed and extruded at 240° C. using a twin-screw extruder, air-cooled, pelletized, and dried at 110° C. for 5 h to obtain a masterbatch;

[0076] S3: uniformly mixing isooctyl thioglycolate and extreme pressure polyurea grease according to parts by mass to obtain a mixture B;

[0077] S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C;

[0078] S5: adding mixture C and mixture B into an injection molding machine according to their mass fractions for injection molding to obtain an injection molding material product;

[0079] The parameters of the injection molding machine are as follows: the barrel temperature zones are set at 270°C for the first zone, 280°C for the second zone, 280°C for the third zone, and the injection head temperature is 260°C; the injection pressure is 75MPa, the injection speed is 16mm / s, the screw speed is 55rpm, and the cooling time is 170s.

[0080] The above-mentioned high temperature resistant and anti-aging injection molding material is used as a lamp holder.

[0081] Example 5

[0082] A high temperature resistant and anti-aging injection molding material is made of the following raw materials in parts by mass: 100 parts of polycarbonate, 1.8 parts of 5-phenyltetrazolyl, 1.5 parts of isooctyl thioglycolate, 0.5 parts of high silica glass fiber, 1.5 parts of extreme pressure polyurea grease, 1.5 parts of anti-deformation modifier and 3 parts of coral powder.

[0083] Among them, the indicators of polycarbonate are: Rockwell hardness 118, melt mass flow rate 12g / min, bending modulus (50.0mm span) 223MPa, thermal conductivity 0.26W / (m·K). High silica glass fiber is high silica glass fiber of Shenzhen Xinxian Technology Co., Ltd., model XGHS-980, and the indicators of high silica glass fiber are: silica content 95wt%, ignition loss 5.6wt%, single fiber diameter 9μm, and length cutting treatment is 1.0mm. Extreme pressure polyurea grease is extreme pressure polyurea grease of Dongguan Excellence Chemical Technology Co., Ltd., model EXLUB PG408. Anti-deformation modifier is anti-deformation modifier of Shenzhen Qinhai Chemical Co., Ltd., model LM902. The median particle size of coral powder is 72μm.

[0084] The method for preparing the above-mentioned high temperature resistant and anti-aging injection molding material comprises the following steps:

[0085] S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A;

[0086] S2: According to the mass fraction, polycarbonate and mixture A are melted and mixed and extruded at 220° C. using a twin-screw extruder, air-cooled, pelletized, and dried at 130° C. for 4 h to obtain a masterbatch;

[0087] S3: uniformly mixing isooctyl thioglycolate and extreme pressure polyurea grease according to parts by mass to obtain a mixture B;

[0088] S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C;

[0089] S5: adding mixture C and mixture B into an injection molding machine according to their mass fractions for injection molding to obtain an injection molding material product;

[0090] The parameters of the injection molding machine are as follows: the barrel temperature zones are set at 270°C for the first zone, 280°C for the second zone, 280°C for the third zone, and the injection head temperature is 260°C; the injection pressure is 80MPa, the injection speed is 15mm / s, the screw speed is 60rpm, and the cooling time is 200s.

[0091] The above-mentioned high temperature resistant and anti-aging injection molding material is used as a lamp holder.

[0092] Comparative Example 1

[0093] No isooctyl thioglycolate, high silica glass fiber, extreme pressure polyurea grease, anti-deformation modifier and coral powder are added. The raw materials of the injection molding material are 95 parts of polycarbonate and 1.9 parts of 5-phenyltetrazolyl; the polycarbonate is dried at 130°C for 4 hours, mixed with 5-phenyltetrazolyl, and added to the injection molding machine for injection molding; other parameters and methods are the same as those in Example 1.

[0094] Comparative Example 2

[0095] No isooctyl thioglycolate is added to the injection molding material; other parameters and methods are the same as in Example 1.

[0096] Comparative Example 3

[0097] No high-silica glass fiber is added to the injection molding material; other parameters and methods are the same as in Example 1.

[0098] Comparative Example 4

[0099] No extreme pressure polyurea grease is added to the injection molding material; other parameters and methods are the same as in Example 1.

[0100] Comparative Example 5

[0101] No anti-deformation modifier is added to the injection molding material; other parameters and methods are the same as in Example 1.

[0102] Comparative Example 6

[0103] No coral powder is added to the injection molding material; other parameters and methods are the same as in Example 1.

[0104] Comparative Example 7

[0105] No isooctyl thioglycolate, extreme pressure polyurea grease and anti-deformation modifier are added to the injection molding material; other parameters and methods are the same as in Example 1.

[0106] According to "Plastic Recycled Plastics Part 7: Polycarbonate (PC) Materials" GB / T 40006.7 and its referenced specifications, performance tests were carried out and the results are shown in Table 1 below.

[0107] Table 1 Performance test results

[0108]

[0109] It can be seen from the above results that the materials of Examples 1 to 5 have good strength and crack resistance, and have good high temperature resistance. Among them, isooctyl thioglycolate has stability and plasticity, which can help improve strength, crack resistance and high temperature resistance; high silica glass fiber has a good effect of improving strength and crack resistance; extreme pressure polyurea grease has a lubricating effect, promotes the composite homogeneity of the material, and can then help improve various indicators; the anti-deformation modifier can mainly improve strength and high temperature resistance; coral powder helps improve strength, crack resistance and high temperature resistance. Isooctyl thioglycolate, extreme pressure polyurea grease and anti-deformation modifier are used in combination, which has a good effect of improving bending strength and can greatly improve high temperature resistance. Isooctyl thioglycolate, high silica glass fiber, extreme pressure polyurea grease, anti-deformation modifier and coral powder have a good synergistic effect, achieving high strength, high bending resistance and high temperature resistance.

[0110] After injection molding of the lamp holder (maximum thickness of 10mm or more), the product appearance evaluation and demoulding evaluation were carried out. Ten parallel samples of each type were made. The evaluation results are shown in Table 2:

[0111] Table 2 Evaluation results

[0112]

[0113] From the above results, it can be seen that the injection-molded lamp holders of Examples 1 to 5 can resist deformation and shrinkage well, demold smoothly, and effectively improve the qualified rate of products. From the comparative example results, it can be seen that on the basis of the shrinkage resistance of 5-phenyltetrazolyl foaming, adding coral powder has better shrinkage resistance; adding anti-deformation modifier can prevent deformation well, and adding isooctyl thioglycolate, extreme pressure polyurea grease and anti-deformation modifier has synergistic anti-shrinkage and anti-deformation capabilities; especially adding extreme pressure polyurea grease has good demolding properties, can improve demolding smoothly, and effectively reduce demolding fracture; isooctyl thioglycolate, high silica glass fiber, extreme pressure polyurea grease, anti-deformation modifier and coral powder are used in combination, which can greatly improve the ability to resist deformation and shrinkage, achieve smooth demolding, and greatly improve the qualified rate of lamp holders with complex structures.

Claims

1. A high temperature resistant and anti-aging injection molding material, characterized in that: The injection molding material is made of the following raw materials in parts by mass: 90 to 100 parts of polycarbonate, 1.8 to 2 parts of 5-phenyltetrazolyl, 0.5 to 1.5 parts of isooctyl thioglycolate, 0.5 to 2.5 parts of high silica glass fiber, 0.5 to 1.5 parts of extreme pressure polyurea grease, 1.5 to 2 parts of anti-deformation modifier and 1 to 3 parts of coral powder; The high-silica glass fiber has the following indicators: a silicon dioxide content greater than 94wt%, a loss on ignition less than 7wt%, a single-filament diameter of 8μm to 10μm, and a length of 0.5mm to 1.5mm; The method for preparing the injection molding material comprises the following steps: S1: Mix high silica glass fiber and coral powder evenly according to weight percentage to obtain a mixture A; S2: According to the mass fractions, the polycarbonate and the mixture A are melted, mixed and extruded by a twin-screw extruder, air-cooled, pelletized and dried to obtain a masterbatch; The melting temperature is 220°C to 240°C; the drying temperature is 110°C to 130°C, and the drying time is 4h to 5h; S3: Mixing isooctyl thioglycolate and extreme pressure polyurea grease uniformly according to parts by mass to obtain a mixture B; S4: uniformly mixing the masterbatch, 5-phenyltetrazolyl and the anti-deformation modifier according to parts by mass to obtain a mixture C; S5: Adding mixture C and mixture B into an injection molding machine according to mass fractions for injection molding to obtain an injection molding material product.

2. The high temperature resistant and aging resistant injection molding material according to claim 1, characterized in that: The polycarbonate has the following indicators: Rockwell hardness of 118-120, melt mass flow rate of 10g / min-12g / min, bending modulus greater than 200MPa, and thermal conductivity less than 0.28W / (m·K).

3. The high temperature resistant and aging resistant injection molding material according to claim 1, characterized in that: The model of the extreme pressure polyurea grease is EXLUB PG408.

4. The high temperature resistant and aging resistant injection molding material according to claim 1, characterized in that: The model of the anti-deformation modifier is LM902.

5. The high temperature resistant and aging resistant injection molding material according to claim 1, characterized in that: The median particle size of the coral powder is 50 μm to 80 μm.

6. The high temperature resistant and aging resistant injection molding material according to claim 1, characterized in that: In S5, the parameters of the injection molding machine are: the barrel temperature zone is set at 270±2°C in the first temperature zone, 280±2°C in the second temperature zone, 280±2°C in the third temperature zone, and the injection head temperature is 260±2°C; the injection pressure is 75MPa~80MPa, the injection speed is 15mm / s~16mm / s, the screw speed is 55rpm~60rpm, and the cooling time is greater than 150s.

7. The use of a high temperature resistant and anti-aging injection molding material according to claim 1, characterized in that: Injection molded material is used as lamp holder.

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