Anti-UV engineering plastic and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to an anti-UV engineering plastic and a preparation method thereof, and the anti-UV engineering plastic comprises the following raw materials by weight: 88-96 parts of engineering plastic; 8-20 parts of general-purpose plastic; 3-5 parts of an impact modifier; 0.2 to 0.5 part of an anti-UV agent; 0.2 to 1 part of an antioxidant; and 0.1-1 part of a dispersant. The anti-UV engineering plastic material is prepared from the following raw materials: engineering plastic, general plastic, an impact modifier, an anti-UV agent, an antioxidant and a dispersing agent, the engineering plastic is taken as a main body material, auxiliaries such as the general plastic, the impact modifier, the composite antibacterial agent, the antioxidant and the dispersing agent are added for synergistic effect, the anti-UV effect is ensured, the dosage of the anti-UV agent is reduced, and the anti-UV effect is improved. The antibacterial engineering plastic material has the advantages that the light aging of the material can be delayed, and the safety coefficient of the product in the use process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to an anti-UV engineering plastic and a preparation method thereof. Background Art

[0002] The market demand for engineering plastics is increasing, especially for outdoor applications and products that are exposed to ultraviolet (UV) environments for a long time, such as car locks and other parts, which have strict requirements for anti-UV performance. Traditional engineering plastics often cannot meet the needs of long-term use due to the lack of effective anti-UV additives or excessive addition. In addition, excessive addition of anti-UV agents not only increases costs, but may also affect other physical properties of the material, such as impact resistance and yellowing resistance.

[0003] Existing UV-resistant engineering plastics have the following problems: the amount of UV-resistant agent added is large, resulting in high costs; excessive UV-resistant agent may affect the impact resistance and yellowing resistance of the material; the production process of traditional UV-resistant agent will produce more waste, which is not conducive to environmental protection. Summary of the invention

[0004] The object of the present invention is to provide a UV-resistant engineering plastic and a preparation method thereof. By optimizing the formula and improving the synthesis process of the anti-UV agent, the usage of the anti-UV agent can be significantly reduced, while maintaining or even improving the impact resistance and yellowing resistance of the material, so as to solve the problems in the prior art raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides a UV-resistant engineering plastic, which comprises the following raw materials in parts by weight: 88-96 parts of engineering plastic; 8-20 parts of general-purpose plastic; 3-5 parts of impact modifier; 0.2-0.5 parts of anti-UV agent; 0.2-1 parts of antioxidant; and 0.1-1 parts of dispersant.

[0006] Preferably, the engineering plastic is at least one of PC, PA, PBT and PET.

[0007] Preferably, the impact modifier is at least one of EM500, MBS and SBS.

[0008] Preferably, the preparation method of the anti-UV agent comprises the following steps: ammoniation of o-nitrochlorobenzene with aqueous ammonia having a concentration of 10%-25% and then diazotization reaction with nitrite to generate diazonium salt.

[0009] Preferably, the mass concentration of the ammonia water is 10%-25%, the mass concentration of the o-nitrochlorobenzene is 5-6%, and the diazonium salt is hydrochloric acid, o-nitroaniline, or sodium nitrite.

[0010] Preferably, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

[0011] Preferably, the preparation method of the general-purpose plastic comprises the following steps: taking 25%-35% acrylonitrile, 25%-30% 1,3-butadiene, 40%-50% styrene and 60 parts of water by weight for later use; mixing styrene and acrylonitrile and adding them to six waters, stirring at 73°C to obtain a prepolymer; adding 1,3-butadiene, styrene-acrylonitrile and the prepolymer to water at 50°C, then shearing and emulsifying at a speed of 3000rpm, and spray drying to obtain the general-purpose plastic.

[0012] Preferably, the styrene-acrylonitrile-containing copolymer is a styrene-acrylonitrile copolymer having a nitrile value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at a temperature of 25°C.

[0013] Another aspect of the present invention provides a method for preparing UV-resistant engineering plastics, comprising the following steps:

[0014] Engineering plastics, general plastics, impact modifiers, UV resistant agents, antioxidants and dispersants are taken in parts by weight and set aside; the above raw materials are mixed, melted, extruded and granulated through a twin-screw extruder to obtain the UV resistant engineering plastics.

[0015] Preferably, the process conditions for melt extrusion of the twin-screw extruder are: zone one temperature is 160-180°C, zone two temperature is 230-250°C, zone three temperature is 230-250°C, zone four temperature is 230-250°C, zone five temperature is 235-255°C, zone six temperature is 235-255°C, zone seven temperature is 230-250°C, zone eight temperature is 210-230°C, head temperature is 245-275°C, and screw speed is 430-480rpm.

[0016] Technical effects and advantages of the present invention: Compared with the prior art, the UV-resistant engineering plastic and the preparation method thereof proposed by the present invention have the following advantages:

[0017] The anti-UV engineering plastic material of the present invention comprises the following raw materials: engineering plastic, general-purpose plastic, impact modifier, anti-UV agent, antioxidant and dispersant. The engineering plastic is used as the main material, and auxiliary agents such as general-purpose plastic, impact modifier, composite antibacterial agent, antioxidant and dispersant are added to work synergistically, thereby ensuring the anti-UV effect while reducing the amount of the anti-UV agent and improving the impact resistance and yellowing resistance of the material. The antibacterial engineering plastic material can delay the light aging of the material and improve the safety factor of the product during use. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] Example 1

[0020] The present embodiment provides a UV-resistant engineering plastic material, which includes the following raw materials in parts by weight: 92 parts of engineering plastic, 12 parts of general-purpose plastic, 4 parts of impact modifier, 0.3 parts of anti-UV agent, 0.6 parts of antioxidant, and 0.6 parts of dispersant.

[0021] The engineering plastic is PC, model FN-1900, and the impact modifier is EM500.

[0022] The preparation method of the above anti-UV agent comprises the following steps:

[0023] The o-nitrochlorobenzene is aminated with ammonia water with a concentration of 10%-25%, and then reacted with nitrite to generate a diazonium salt through a diazotization reaction. The diazotization reaction does not need to be carried out in a strong acid medium, and comprehensively utilizes the by-product ammonia water of existing products, with low discharge of three wastes and low required costs. The reduction closed-loop process of the intermediate azo product adopts a two-step reduction method, which avoids the strong reducing agent directly reducing the azo double bond to amine, reduces the generation of impurities, and not only improves the product purity, but also improves the product yield.

[0024] The diazonium salt is generated by diazotization reaction of o-nitrochlorobenzene and nitrite. The diazotization reaction does not need to be carried out in a strong acid medium. The solid component is filtered and retained, and then dried at 90°C to obtain component B.

[0025] The component A and the component B are mixed in a weight ratio of 1:1 to obtain the anti-UV agent.

[0026] Furthermore, the mass concentration of the ammonia solution is 10%-25%; the mass concentration of the o-nitrochlorobenzene is 5.5%; and the nitrite is NaNO2.

[0027] Furthermore, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

[0028] The preparation method of the above-mentioned general plastic comprises the following steps:

[0029] Take 25%-35% acrylonitrile, 25%-30% 1,3-butadiene, 40%-50% styrene and 60 parts water by weight for later use;

[0030] Styrene and acrylonitrile are mixed and added into six waters, and stirred at 73°C to obtain a prepolymer;

[0031] 1,3-butadiene, styrene-acrylonitrile and the prepolymer are added to water at a temperature of 50°C, and then sheared and emulsified at a rotation speed of 3000 rpm, and spray-dried to obtain the general-purpose plastic.

[0032] Furthermore, the styrene-acrylonitrile copolymer contains a styrene-acrylonitrile group value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at a temperature of 25°C.

[0033] The method for preparing the above-mentioned UV-resistant general plastic material comprises the following steps:

[0034] Take engineering plastics, general plastics, impact modifier, UV inhibitor, antioxidant and dispersant according to weight parts and set aside;

[0035] The anti-UV engineering plastic material is obtained by mixing engineering plastics, general plastics, impact modifiers, anti-UV agents, antioxidants and dispersants, melting, extruding and granulating through a twin-screw extruder.

[0036] Furthermore, the process conditions for melt extrusion of the twin-screw extruder are: zone 1 temperature is 170°C, zone 2 temperature is 250°C, zone 3 temperature is 260°C, zone 4 temperature is 260°C, zone 5 temperature is 260°C, zone 6 temperature is 260°C, zone 7 temperature is 240°C, zone 8 temperature is 240°C, the die temperature is 260°C, and the screw speed is 400rpm.

[0037] Example 2

[0038] An antibacterial general plastic material comprises the following raw materials in parts by weight: 88 parts of engineering plastics, 8 parts of general plastics, 3 parts of impact modifiers, 0.2 parts of anti-UV agents, 0.2 parts of antioxidants, and 0.1 parts of dispersants.

[0039] Furthermore, the engineering plastic is PC, model FN-1900, and the impact modifier is EM500.

[0040] The preparation method of the above-mentioned anti-UV agent comprises the following steps:

[0041] The o-nitrochlorobenzene is aminated with ammonia water with a concentration of 10%-25%, and then reacted with nitrite to generate a diazonium salt through a diazotization reaction. The diazotization reaction does not need to be carried out in a strong acid medium, and comprehensively utilizes the by-product ammonia water of existing products, with low discharge of three wastes and low required costs. The reduction closed-loop process of the intermediate azo product adopts a two-step reduction method, which avoids the strong reducing agent directly reducing the azo double bond to amine, reduces the generation of impurities, and not only improves the product purity, but also improves the product yield.

[0042] The diazonium salt is generated by diazotization reaction of o-nitrochlorobenzene and nitrite. The diazotization reaction does not need to be carried out in a strong acid medium. The solid component is filtered and retained, and then dried at 90°C to obtain component B.

[0043] The component A and the component B are mixed in a weight ratio of 1:1 to obtain the anti-UV agent.

[0044] Furthermore, the mass concentration of the ammonia solution is 10%-25%; the mass concentration of the o-nitrochlorobenzene is 5.5%; and the nitrite is NaNO2.

[0045] Furthermore, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

[0046] Furthermore, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

[0047] The preparation method of the above-mentioned general plastic comprises the following steps:

[0048] Take 25%-35% acrylonitrile, 25%-30% 1,3-butadiene, 40%-50% styrene and 60 parts water by weight for later use;

[0049] Styrene and acrylonitrile are mixed and added into six waters, and stirred at 73°C to obtain a prepolymer;

[0050] 1,3-butadiene, styrene-acrylonitrile and the prepolymer are added to water at a temperature of 50°C, and then sheared and emulsified at a rotation speed of 3000 rpm, and spray-dried to obtain the general-purpose plastic.

[0051] The styrene-acrylonitrile copolymer contains a styrene-acrylonitrile group value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at a temperature of 25°C.

[0052] The preparation method of the above-mentioned UV-resistant engineering plastic material comprises the following steps:

[0053] Take engineering plastics, general plastics, impact modifier, UV inhibitor, antioxidant and dispersant according to weight parts and set aside;

[0054] The engineering plastic, general plastic, impact modifier, UV inhibitor, antioxidant and dispersant are mixed, melted, extruded and granulated by a twin-screw extruder to obtain the antibacterial general plastic material.

[0055] Furthermore, the process conditions for melt extrusion of the twin-screw extruder are: zone 1 temperature is 170°C, zone 2 temperature is 250°C, zone 3 temperature is 260°C, zone 4 temperature is 260°C, zone 5 temperature is 260°C, zone 6 temperature is 260°C, zone 7 temperature is 240°C, zone 8 temperature is 240°C, the die temperature is 260°C, and the screw speed is 400rpm.

[0056] Example 3

[0057] The present embodiment provides a UV-resistant engineering plastic material, which includes the following raw materials in parts by weight: 96 parts of engineering plastic, 20 parts of general-purpose plastic, 5 parts of impact modifier, 0.5 parts of anti-UV agent, 1 part of antioxidant, and 1 part of dispersant.

[0058] The engineering plastic is PC, model FN-1900, and the impact modifier is EM500.

[0059] The preparation method of the above-mentioned anti-UV agent comprises the following steps:

[0060] The o-nitrochlorobenzene is aminated with ammonia water with a concentration of 10%-25%, and then reacted with nitrite to generate a diazonium salt through a diazotization reaction. The diazotization reaction does not need to be carried out in a strong acid medium, and comprehensively utilizes the by-product ammonia water of existing products, with low discharge of three wastes and low required costs. The reduction closed-loop process of the intermediate azo product adopts a two-step reduction method, which avoids the strong reducing agent directly reducing the azo double bond to amine, reduces the generation of impurities, and not only improves the product purity, but also improves the product yield.

[0061] The diazonium salt is generated by diazotization reaction of o-nitrochlorobenzene and nitrite. The diazotization reaction does not need to be carried out in a strong acid medium. The solid component is filtered and retained, and then dried at 90°C to obtain component B.

[0062] The component A and the component B are mixed in a weight ratio of 1:1 to obtain the anti-UV agent.

[0063] The mass concentration of the ammonia solution is 10%-25%; the mass concentration of the o-nitrochlorobenzene is 5.5%; the nitrite is NaNO2; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

[0064] The preparation method of the above-mentioned general plastic comprises the following steps:

[0065] Take 25%-35% acrylonitrile, 25%-30% 1,3-butadiene, 40%-50% styrene and 60 parts water by weight for later use;

[0066] Styrene and acrylonitrile are mixed and added into six waters, and stirred at 73°C to obtain a prepolymer;

[0067] 1,3-butadiene, styrene-acrylonitrile and the prepolymer are added to water at a temperature of 50°C, and then sheared and emulsified at a rotation speed of 3000 rpm, and spray-dried to obtain the general-purpose plastic.

[0068] The styrene-acrylonitrile-containing copolymer is a styrene-acrylonitrile copolymer having a nitrile value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at 25°C. The amino-containing polydimethylsiloxane is an aminopropyl-terminated polydimethylsiloxane having an amino value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at 25°C.

[0069] The preparation method of the above-mentioned UV-resistant engineering plastic material comprises the following steps:

[0070] Take engineering plastics, general plastics, impact modifier, UV inhibitor, antioxidant and dispersant according to weight parts and set aside;

[0071] The anti-UV engineering plastic material is obtained by mixing engineering plastics, general plastics, impact modifiers, anti-UV agents, antioxidants and dispersants, melting, extruding and granulating through a twin-screw extruder.

[0072] Among them, the process conditions for melt extrusion of the twin-screw extruder are: zone 1 temperature is 170°C, zone 2 temperature is 250°C, zone 3 temperature is 260°C, zone 4 temperature is 260°C, zone 5 temperature is 260°C, zone 6 temperature is 260°C, zone 7 temperature is 240°C, zone 8 temperature is 240°C, the head temperature is 260°C, and the screw speed is 400rpm.

[0073] Example 4

[0074] The present embodiment provides an antibacterial general plastic material, which includes the following raw materials in parts by weight: 90 parts of engineering plastics, 18 parts of general plastics, 3 parts of impact modifiers, 0.4 parts of anti-UV agents, 0.5 parts of antioxidants, and 0.8 parts of dispersants.

[0075] The engineering plastic is PC, model FN-1900, and the impact modifier is EM500.

[0076] The preparation method of the above-mentioned anti-UV agent comprises the following steps:

[0077] The o-nitrochlorobenzene is aminated with ammonia water with a concentration of 10%-25%, and then reacted with nitrite to generate a diazonium salt through a diazotization reaction. The diazotization reaction does not need to be carried out in a strong acid medium, and comprehensively utilizes the by-product ammonia water of existing products, with low discharge of three wastes and low required costs. The reduction closed-loop process of the intermediate azo product adopts a two-step reduction method, which avoids the strong reducing agent directly reducing the azo double bond to amine, reduces the generation of impurities, and not only improves the product purity, but also improves the product yield.

[0078] The diazonium salt is generated by diazotization reaction of o-nitrochlorobenzene and nitrite. The diazotization reaction does not need to be carried out in a strong acid medium. The solid component is filtered and retained, and then dried at 90°C to obtain component B.

[0079] The component A and the component B are mixed in a weight ratio of 1:1 to obtain the anti-UV agent.

[0080] Furthermore, the mass concentration of the ammonia solution is 10%-25%; the mass concentration of the o-nitrochlorobenzene is 5.5%; the nitrite is NaNO2; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

[0081] The preparation method of the above-mentioned general plastic comprises the following steps:

[0082] Take 25%-35% acrylonitrile, 25%-30% 1,3-butadiene, 40%-50% styrene and 60 parts water by weight for later use;

[0083] Styrene and acrylonitrile are mixed and added into six waters, and stirred at 73°C to obtain a prepolymer;

[0084] 1,3-butadiene, styrene-acrylonitrile and the prepolymer are added to water at a temperature of 50°C, and then sheared and emulsified at a rotation speed of 3000 rpm, and spray-dried to obtain the general-purpose plastic.

[0085] The styrene-acrylonitrile-containing copolymer is a styrene-acrylonitrile copolymer having a nitrile value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at 25°C. The amino-containing polydimethylsiloxane is an aminopropyl-terminated polydimethylsiloxane having an amino value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at 25°C.

[0086] The preparation method of the above-mentioned UV-resistant engineering plastic material comprises the following steps:

[0087] Take engineering plastics, general plastics, impact modifier, UV inhibitor, antioxidant and dispersant according to weight parts and set aside;

[0088] The anti-UV engineering plastic material is obtained by mixing engineering plastics, general plastics, impact modifiers, anti-UV agents, antioxidants and dispersants, melting, extruding and granulating through a twin-screw extruder.

[0089] Furthermore, the process conditions for melt extrusion of the twin-screw extruder are: zone 1 temperature is 170°C, zone 2 temperature is 250°C, zone 3 temperature is 260°C, zone 4 temperature is 260°C, zone 5 temperature is 260°C, zone 6 temperature is 260°C, zone 7 temperature is 240°C, zone 8 temperature is 240°C, the die temperature is 260°C, and the screw speed is 400rpm.

[0090] Comparative Example 1

[0091] The difference between this comparative example and Example 1 is that the anti-UV agent does not contain component A.

[0092] Comparative Example 2

[0093] The difference between this comparative example and Example 1 is that the anti-UV agent does not contain the B component.

[0094] Comparative Example 3

[0095] The difference between this comparative example and Example 1 is that the anti-UV agent is replaced by a chlorobenzotriazole anti-UV agent.

[0096] Comparative Example 4

[0097] The difference between this comparative example and Example 1 is that the general plastic is replaced by polybutylene terephthalate PBTB2550.

[0098] Comparative Example 5

[0099] The difference between this comparative example and Example 1 is that the anti-UV engineering plastic material does not contain general-purpose plastic.

[0100] Specifically, the anti-UV engineering plastic materials of Examples 1-4 and Comparative Examples 1-5 were taken to test their tensile strength, notched impact strength, UV resistance and yellowing resistance. The test method is as follows:

[0101] Tensile strength: tested according to ISO527, test speed: 50mm / min, unit: MPa;

[0102] Izod beam notched impact strength: tested according to ISO180, pendulum energy 2.75J, unit is kJ / m2;

[0103] Yellowing resistance: Sample form: round piece, D100mm, placed in HZ-3017 bulb-type yellowing resistance test box, illuminated for 24 hours under a 300W UV lamp, the distance between the sample and the bulb is 25cm, the temperature in the exposure box is about 60℃. When the test time is reached, take out and cool for more than 10 minutes, and calculate the change in the yellow index of the sample △E.

[0104] The test results are shown in Table 1 below:

[0105]

[0106]

[0107] As can be seen from Table 1 above, the present invention uses engineering plastics as the main material, and adds specific general-purpose plastics, impact modifiers, UV inhibitors, antioxidants, dispersants and other additives to work synergistically, thereby ensuring the anti-UV effect while reducing the amount of the UV inhibitor and improving the impact resistance and yellowing resistance of the material.

[0108] The anti-UV engineering plastic material used in the production of smart car lock products can resist the damage of sunlight and other light to plastics, and improve the safety factor of the product during use. Compared with comparative examples 1-3, Example 1 uses a specific anti-UV agent, which has a greater promoting effect on tensile strength, impact strength and yellowing resistance. Compared with comparative examples 4-5, Example 1 uses a specific general-purpose plastic, which has a greater promoting effect on tensile strength and impact strength, and also has a certain improvement in UV resistance and yellowing resistance.

[0109] In summary, the anti-UV engineering plastic material of the present invention comprises the following raw materials: engineering plastic, general-purpose plastic, impact modifier, anti-UV agent, antioxidant and dispersant. The engineering plastic is used as the main material, and auxiliary agents such as general-purpose plastic, impact modifier, composite antibacterial agent, antioxidant and dispersant are added to work synergistically. While ensuring the anti-UV effect, the amount of the anti-UV agent is reduced, and the impact resistance and yellowing resistance of the material are improved. The antibacterial engineering plastic material can delay the light aging of the material and improve the safety factor of the product during use.

[0110] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A UV-resistant engineering plastic, It is characterized in that The anti-UV engineering plastics include the following raw materials in parts by weight: Engineering plastics 88-96 parts; 8-20 parts of general plastic; 3-5 parts of impact modifier; Anti-UV agent 0.2-0.5 parts; Antioxidant 0.2-1 part; Dispersant 0.1-1 part.

2. The UV-resistant engineering plastic according to claim 1, It is characterized in that The engineering plastic is at least one of PC, PA, PBT and PET.

3. The UV-resistant engineering plastic according to claim 1, It is characterized in that The impact modifier is at least one of EM500, MBS and SBS.

4. The UV-resistant engineering plastic according to claim 1, It is characterized in that The preparation method of the anti-UV agent comprises the following steps: The o-nitrochlorobenzene is aminated with ammonia water with a concentration of 10% to 25%, and then reacted with nitrite to form a diazonium salt.

5. The UV-resistant engineering plastic according to claim 1, It is characterized in that The mass concentration of the ammonia water is 10%-25%, the mass concentration of the o-nitrochlorobenzene is 5-6%, and the diazonium salt is hydrochloric acid, o-nitroaniline, and sodium nitrite.

6. The UV-resistant engineering plastic according to claim 1, It is characterized in that The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; and the dispersant is N,N'-ethylene bisstearamide.

7. The UV-resistant engineering plastic according to claim 1, It is characterized in that The preparation method of the general plastic comprises the following steps: Take 25%-35% acrylonitrile, 25%-30% 1,3-butadiene, 40%-50% styrene and 60 parts water by weight for later use; Styrene and acrylonitrile are mixed and added into six waters, and stirred at 73°C to obtain a prepolymer; 1,3-butadiene, styrene-acrylonitrile and the prepolymer are added to water at a temperature of 50°C, and then sheared and emulsified at a rotation speed of 3000 rpm, and spray-dried to obtain the general-purpose plastic.

8. The UV-resistant engineering plastic according to claim 7, It is characterized in that The styrene-acrylonitrile copolymer contains a styrene-acrylonitrile group value of 0.8 mmol / g and a viscosity of 1.2 Pa·s at a temperature of 25°C.

9. A method for preparing a UV-resistant engineering plastic according to any one of claims 1 to 8, It is characterized in that The steps include: Take engineering plastics, general plastics, impact modifier, UV inhibitor, antioxidant and dispersant according to weight parts and set aside; The above raw materials are mixed, melted, extruded and granulated by a twin-screw extruder to obtain the UV-resistant engineering plastic.

10. The preparation method according to claim 9, It is characterized in that The process conditions of the twin-screw extruder melt extrusion are: The temperature of zone 1 is 160-180℃, the temperature of zone 2 is 230-250℃, the temperature of zone 3 is 230-250℃, the temperature of zone 4 is 230-250℃, the temperature of zone 5 is 235-255℃, the temperature of zone 6 is 235-255℃, the temperature of zone 7 is 230-250℃, the temperature of zone 8 is 210-230℃, the temperature of the die head is 245-275℃, and the screw speed is 430-480rpm.

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