Flame-retardant plastic particles and processing method thereof

Abstract

The invention discloses flame-retardant plastic particles and a processing method thereof. The flame-retardant plastic particles comprise the following components in parts by weight: 120-145 parts of polyvinyl chloride, 80-95 parts of polypropylene, 45-70 parts of polycarbonate, 5-11 parts of a flame-retardant enhancer, 3-8 parts of an antioxidant, 3-6 parts of a heat stabilizer, 6-15 parts of a plasticizer and 2-5 parts of a lubricant. The flame-retardant reinforcing agent comprises the following components: white carbon black, polysiloxane, hydroxyl silicone oil and methyl MQ silicon resin. In the preparation process, the raw materials of the flame-retardant reinforcing agent are separately added, so that the raw materials are uniformly mixed, and meanwhile, the raw materials are mixed at different temperatures according to the performance characteristics of the raw materials so as to exert the optimal performance of the raw materials. Experimental results show that the plastic particles prepared by the scheme have good flame retardant property and meet the flame retardant requirement. Meanwhile, after an aging test, good tensile strength retention rate and impact strength retention rate are kept, and good oxidation resistance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic particles, and more particularly to flame-retardant plastic particles and a processing method thereof. Background Art

[0002] Flame retardant plastics are a type of plastic material that has been specially treated or doped with flame retardants to improve its flame retardant properties. These materials can slow down the burning speed or prevent the spread of flames when encountering a fire source, thereby improving safety.

[0003] Among them, engineering plastics have excellent comprehensive performance, good heat and cold resistance, excellent mechanical properties in a wide temperature range, good corrosion resistance, less environmental impact, good durability, easy processing, high production efficiency, and cost savings. However, in general, engineering plastics have poor flame retardant properties, are easy to burn, and cause fires during use, seriously threatening life, health, and property safety. Therefore, it is very important to develop high-quality flame retardants for engineering plastics to improve flame retardant properties while ensuring the excellent comprehensive performance of engineering plastics. Summary of the invention

[0004] The purpose of the present invention is to provide a flame retardant plastic particle and a processing method thereof, so as to solve the technical problems existing in the above-mentioned background technology.

[0005] The technical solution of the present invention provides a flame retardant plastic particle, comprising the following components by weight: 120-145 parts of polyvinyl chloride, 80-95 parts of polypropylene, 45-70 parts of polycarbonate, 5-11 parts of flame retardant reinforcing agent, 3-8 parts of antioxidant, 3-6 parts of heat stabilizer, 6-15 parts of plasticizer, and 2-5 parts of lubricant;

[0006] The flame retardant enhancer includes the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10: (2-5): (1-4): (1-2): (1-3).

[0007] In a preferred embodiment, the components include the following weight fractions: 120 parts of polyvinyl chloride, 85 parts of polypropylene, 55 parts of polycarbonate, 10 parts of flame retardant enhancer, 7 parts of antioxidant, 3 parts of heat stabilizer, 8 parts of plasticizer, and 3 parts of lubricant;

[0008] The flame retardant reinforcing agent comprises the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10:3:2:1:2.

[0009] In a preferred embodiment, the antioxidant is one or more of antioxidant 1010, antioxidant 330, antioxidant 3114, antioxidant 1098, antioxidant 168, and antioxidant 1076.

[0010] In a preferred embodiment, the heat stabilizer is one or more of butylated hydroxyanisole, butylated hydroxybenzoic acid, and titanium dioxide.

[0011] In a preferred embodiment, the plasticizer is one or more of dimethyl acetate, polyvinyl alcohol, triphenyl phosphate, dioctyl phthalate, and dibutyl phthalate.

[0012] In a preferred embodiment, the lubricant is one or more of polysiloxane, calcium stearate, magnesium stearate, zinc stearate vinyl bisstearamide.

[0013] A method for processing flame retardant plastic particles comprises the following steps:

[0014] S1: Add 120-145 parts of polyvinyl chloride, 80-95 parts of polypropylene, 45-70 parts of polycarbonate, 5-11 parts of flame retardant enhancer, 3-8 parts of antioxidant, 3-6 parts of heat stabilizer, 6-15 parts of plasticizer and 2-5 parts of lubricant into a mixer, mix for 30-50 minutes to obtain a mixture;

[0015] S2: Add the mixed material into a twin-screw extruder, set the screw speed to 300r / min, the temperature to 150-200°C, extrude and granulate, and obtain flame-retardant plastic particles.

[0016] In a preferred embodiment, the preparation process of the flame retardant enhancer is: add white carbon black to a high-speed mixing machine, heat it to 100-200°C, then add hydroxy silicone oil and heat it to 250°C, stir for 15-25 minutes, maintain the temperature, add polyorganosiloxane and methyl MQ silicone resin, and continue stirring for 30-40 minutes to obtain the flame retardant enhancer.

[0017] The beneficial effects of the technical solution of the present invention are:

[0018] In this scheme, a flame retardant reinforcing agent is added, wherein the flame retardant reinforcing agent includes white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin. During the preparation process, the above raw materials are added separately to ensure that the raw materials are mixed evenly. At the same time, according to the performance characteristics of each raw material, they are mixed at different temperatures to give full play to the optimal performance of the raw materials. From the experimental results, the plastic particles prepared by this scheme have good flame retardant properties and meet the flame retardant requirements. At the same time, after aging tests, they maintain good tensile strength retention and impact strength retention, and have good antioxidant properties. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific uses.

[0020] Example 1

[0021] The technical solution of the present invention provides a flame retardant plastic particle, comprising the following components by weight: 120 parts of polyvinyl chloride, 85 parts of polypropylene, 55 parts of polycarbonate, 10 parts of flame retardant reinforcing agent, 7 parts of antioxidant, 3 parts of heat stabilizer, 8 parts of plasticizer, and 3 parts of lubricant;

[0022] The flame retardant reinforcing agent comprises the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10:3:2:1:2.

[0023] The preparation process of the flame retardant enhancer is as follows: adding white carbon black to a high-speed mixing machine, heating to 100° C., then adding hydroxy silicone oil and heating to 250° C., stirring for 25 minutes, maintaining the temperature, adding polyorganosiloxane and methyl MQ silicone resin, and continuously stirring for 30 minutes to obtain the flame retardant enhancer.

[0024] The antioxidant is a mixture of antioxidant 1010 and antioxidant 330. The heat stabilizer is butylated hydroxyanisole. The plasticizer is a mixture of dimethyl acetate and polyvinyl alcohol. The lubricant is a mixture of polysiloxane, calcium stearate, and.

[0025] A method for processing flame retardant plastic particles comprises the following steps:

[0026] S1: 120 parts of polyvinyl chloride, 85 parts of polypropylene, 55 parts of polycarbonate, 10 parts of flame retardant enhancer, 7 parts of antioxidant, 3 parts of heat stabilizer, 8 parts of plasticizer and 3 parts of lubricant were mixed for 30 minutes to obtain a mixture;

[0027] S2: Add the mixed material into a twin-screw extruder, set the screw speed to 300 r / min, the temperature to 150° C., extrude and granulate to obtain flame-retardant plastic particles.

[0028] Example 2

[0029] The technical solution of the present invention provides a flame retardant plastic particle, comprising the following components by weight: 120 parts of polyvinyl chloride, 80 parts of polypropylene, 45 parts of polycarbonate, 5 parts of flame retardant reinforcing agent, 3 parts of antioxidant, 3 parts of heat stabilizer, 6 parts of plasticizer, and 2 parts of lubricant;

[0030] The flame retardant reinforcing agent includes the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10:2:1:1:1.

[0031] The preparation process of the flame retardant enhancer is as follows: adding white carbon black to a high-speed mixing machine, heating to 100° C., then adding hydroxy silicone oil and heating to 250° C., stirring for 15 minutes, maintaining the temperature, adding polyorganosiloxane and methyl MQ silicone resin, and continuously stirring for 40 minutes to obtain the flame retardant enhancer.

[0032] The antioxidant is a mixture of antioxidant 3114 and antioxidant 1098. The heat stabilizer is butylated hydroxybenzoic acid. The plasticizer is a mixture of triphenyl phosphate and dioctyl phthalate. The lubricant is a mixture of magnesium stearate and zinc stearate vinyl bis stearamide.

[0033] A method for processing flame retardant plastic particles comprises the following steps:

[0034] S1: Add 120 parts of polyvinyl chloride, 80 parts of polypropylene, 45 parts of polycarbonate, 5 parts of flame retardant enhancer, 3 parts of antioxidant, 3 parts of heat stabilizer, 6 parts of plasticizer and 2 parts of lubricant into a mixer and mix for 30 minutes to obtain a mixture;

[0035] S2: Add the mixed material into a twin-screw extruder, set the screw speed to 300 r / min, the temperature to 150° C., extrude and granulate to obtain flame-retardant plastic particles.

[0036] Example 3

[0037] The technical solution of the present invention provides a flame retardant plastic particle, comprising the following components by weight: 145 parts of polyvinyl chloride, 95 parts of polypropylene, 70 parts of polycarbonate, 11 parts of flame retardant reinforcing agent, 3-8 parts of antioxidant, 6 parts of heat stabilizer, 15 parts of plasticizer, and 5 parts of lubricant;

[0038] The flame retardant reinforcing agent comprises the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10:5:4:2:3.

[0039] The preparation process of the flame retardant enhancer is as follows: adding white carbon black to a high-speed mixing machine, heating to 200°C, then adding hydroxy silicone oil and heating to 250°C, stirring for 25 minutes, maintaining the temperature, adding polyorganosiloxane and methyl MQ silicone resin, and continuously stirring for 40 minutes to obtain the flame retardant enhancer.

[0040] The antioxidant is a mixture of antioxidant 168 and antioxidant 1076. The heat stabilizer is titanium dioxide. The plasticizer is dibutyl phthalate. The lubricant is magnesium stearate.

[0041] A method for processing flame retardant plastic particles comprises the following steps:

[0042] S1: Add 145 parts of polyvinyl chloride, 95 parts of polypropylene, 70 parts of polycarbonate, 11 parts of flame retardant enhancer, 3-8 parts of antioxidant, 6 parts of heat stabilizer, 15 parts of plasticizer and 5 parts of lubricant into a mixer and mix for 50 minutes to obtain a mixture;

[0043] S2: Add the mixed material into a twin-screw extruder, set the screw speed to 300 r / min, the temperature to 200° C., extrude and granulate to obtain flame-retardant plastic particles.

[0044] Example 4

[0045] The technical solution of the present invention provides a flame retardant plastic particle, comprising the following components by weight: 145 parts of polyvinyl chloride, 85 parts of polypropylene, 60 parts of polycarbonate, 9 parts of flame retardant reinforcing agent, 6 parts of antioxidant, 6 parts of heat stabilizer, 7 parts of plasticizer, and 4 parts of lubricant;

[0046] The flame retardant reinforcing agent comprises the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10:4:2:1:3.

[0047] The preparation process of the flame retardant enhancer is as follows: adding white carbon black to a high-speed mixing machine, heating to 180°C, then adding hydroxy silicone oil and heating to 250°C, stirring for 20 minutes, maintaining the temperature, adding polyorganosiloxane and methyl MQ silicone resin, and continuously stirring for 35 minutes to obtain the flame retardant enhancer.

[0048] The antioxidant is a mixture of antioxidant 330 and antioxidant 3114. The heat stabilizer is titanium dioxide. The plasticizer is dimethyl acetate. The lubricant is polysiloxane.

[0049] A method for processing flame retardant plastic particles comprises the following steps:

[0050] S1: 145 parts of polyvinyl chloride, 85 parts of polypropylene, 60 parts of polycarbonate, 9 parts of flame retardant enhancer, 6 parts of antioxidant, 6 parts of heat stabilizer, 7 parts of plasticizer and 4 parts of lubricant were added into a mixer and mixed for 45 minutes to obtain a mixture;

[0051] S2: Add the mixed material into a twin-screw extruder, set the screw speed to 300 r / min, the temperature to 180° C., extrude and granulate to obtain flame-retardant plastic particles.

[0052] Comparative Example 1

[0053] Compared with Example 1, the difference is that no flame retardant reinforcing agent is added.

[0054] Comparative Example 2

[0055] Example 1 of patent application number 201610828315.4.

[0056] Comparative Example 3

[0057] Example 1 of patent application number 201510431571.5.

[0058] The performance of the plastic particles prepared in Examples 1-4 and Comparative Examples 1-3 was tested, and the test results are shown in Table 1 below: (1) The flame retardant performance was measured in accordance with the UL94 standard using a horizontal / vertical burning tester, and the heat deformation temperature was measured in accordance with GB / T1634.2-2004.

[0059] (2) The plastic particles are added to an injection molding machine for injection molding to form test strips, and the volume resistivity is tested. The test strips are then aged in air at 120° C. for 500 h, and the tensile strength retention rate and impact strength retention rate are tested.

[0060] Table 1

[0061]

[0062] As shown in Table 1 above, the plastic particles prepared in this scheme have good flame retardant properties and meet the flame retardant requirements. At the same time, after aging tests, they all maintain good tensile strength retention and impact strength retention rates and have good antioxidant properties.

[0063] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A flame retardant plastic particle, characterized in that: The invention comprises the following components by weight: 120-145 parts of polyvinyl chloride, 80-95 parts of polypropylene, 45-70 parts of polycarbonate, 5-11 parts of flame retardant reinforcing agent, 3-8 parts of antioxidant, 3-6 parts of heat stabilizer, 6-15 parts of plasticizer and 2-5 parts of lubricant; The flame retardant enhancer includes the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10: (2-5): (1-4): (1-2): (1-3).

2. The flame retardant plastic particles according to claim 1, characterized in that: The invention comprises the following components by weight: 120 parts of polyvinyl chloride, 85 parts of polypropylene, 55 parts of polycarbonate, 10 parts of flame retardant reinforcing agent, 7 parts of antioxidant, 3 parts of heat stabilizer, 8 parts of plasticizer and 3 parts of lubricant; The flame retardant reinforcing agent comprises the following components: white carbon black, polyorganosiloxane, hydroxy silicone oil, and methyl MQ silicone resin, and the mass ratio of the components is: white carbon black: polyorganosiloxane: hydroxy silicone oil: methyl MQ silicone resin is 10:3:2:1:

2.

3. The flame retardant plastic particles according to claim 1, characterized in that: The antioxidant is one or more of antioxidant 1010, antioxidant 330, antioxidant 3114, antioxidant 1098, antioxidant 168, and antioxidant 1076.

4. The flame retardant plastic particles according to claim 1, characterized in that: The heat stabilizer is one or more of butylated hydroxyanisole, butylated hydroxybenzoic acid and titanium dioxide.

5. The flame retardant plastic particles according to claim 1, characterized in that: The plasticizer is one or more of dimethyl acetate, polyvinyl alcohol, triphenyl phosphate, dioctyl phthalate, and dibutyl phthalate.

6. The flame retardant plastic particles according to claim 1, characterized in that: The lubricant is one or more of polysiloxane, calcium stearate, magnesium stearate, zinc stearate vinyl bisstearamide.

7. A method for processing flame retardant plastic particles according to any one of claims 1 to 6, characterized in that: The steps include: S1: Add 120-145 parts of polyvinyl chloride, 80-95 parts of polypropylene, 45-70 parts of polycarbonate, 5-11 parts of flame retardant enhancer, 3-8 parts of antioxidant, 3-6 parts of heat stabilizer, 6-15 parts of plasticizer and 2-5 parts of lubricant into a mixer, mix for 30-50 minutes to obtain a mixture; S2: Add the mixed material into a twin-screw extruder, set the screw speed to 300r / min, the temperature to 150-200°C, extrude and granulate, and obtain flame-retardant plastic particles.

8. The method for processing flame retardant plastic particles according to claim 7, characterized in that: The preparation process of the flame retardant enhancer is as follows: adding white carbon black into a high-speed mixing machine, heating to 100-200° C., then adding hydroxy silicone oil and heating to 250° C., stirring for 15-25 minutes, maintaining the temperature, adding polyorganosiloxane and methyl MQ silicone resin, and continuously stirring for 30-40 minutes to obtain the flame retardant enhancer.

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