阅读说明：本技术 一种阻燃耐热abs塑料颗粒 (Flame-retardant heat-resistant ABS plastic particle ) 是由 靳成龙 靳南南 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种阻燃耐热ABS塑料颗粒,属于改性塑料技术领域,该阻燃耐热ABS塑料颗粒包括以下原料：改性ABS树脂、阻燃剂、可膨胀石墨、助剂、抗氧剂、高胶粉。该阻燃耐热ABS塑料颗粒,通过引入中间体2,ABS树脂的表面形成了致密、平滑且较为完整的连续层,中间体2与中间体1发生了作用,促进了炭层的有效形成,改善了炭层表面的质量,连续、致密的炭层,隔绝了燃烧过程中热量和氧气向材料内部渗透,大大提高了凝固相的阻燃效率,中间体2的加入改善了阻燃复配体系在ABS树脂中的分散性,使中间体1和中间体3均匀的分散在ABS树脂中,增加了共混材料的韧性,进而使ABS树脂颗粒的冲击强度得到提升。(The invention discloses flame-retardant heat-resistant ABS plastic particles, which belong to the technical field of modified plastics and comprise the following raw materials: modified ABS resin, flame retardant, expandable graphite, auxiliary agent, antioxidant and high rubber powder. According to the flame-retardant heat-resistant ABS plastic particle, the intermediate 2 is introduced, a compact, smooth and complete continuous layer is formed on the surface of ABS resin, the intermediate 2 and the intermediate 1 act to promote effective formation of a carbon layer, the quality of the surface of the carbon layer is improved, the continuous and compact carbon layer isolates heat and oxygen from permeating into the material in the combustion process, the flame-retardant efficiency of a solidified phase is greatly improved, the dispersibility of a flame-retardant complexing system in the ABS resin is improved by the addition of the intermediate 2, the intermediate 1 and the intermediate 3 are uniformly dispersed in the ABS resin, the toughness of a blending material is improved, and further the impact strength of the ABS resin particle is improved.)

1. A flame-retardant heat-resistant ABS plastic particle is characterized in that: the feed comprises the following raw materials in parts by weight: 65-80 parts of modified ABS resin, 5.2-6.5 parts of flame retardant, 0.3-0.6 part of expandable graphite, 1.6-3.5 parts of auxiliary agent, 0.8-1.5 parts of antioxidant and 2.8-4.5 parts of high rubber powder;

the flame retardant is prepared by the following steps:

step one, mixing and stirring 2-carboxyethyl phenyl hypophosphorous acid and distilled water until the 2-carboxyethyl phenyl hypophosphorous acid is completely dissolved, dissolving melamine in the distilled water, mixing the 2-carboxyethyl phenyl hypophosphorous acid solution and the melamine solution, heating for reaction, cooling and filtering after the reaction is finished, washing by using the distilled water, and drying to obtain an intermediate 1;

step two, mixing and stirring calcium chloride and N, N-dimethylacetamide until the calcium chloride is completely dissolved, adding ethylenediamine, stirring and dissolving, then adding terephthaloyl chloride at the temperature of 0-5 ℃, stirring and reacting, heating the system to 50 ℃, adding triethylamine, stirring and reacting, cooling and filtering after the reaction is finished, and washing and drying by using distilled water to obtain an intermediate 2;

step three, mixing 4,4' -dihydroxybiphenyl and aluminum chloride, uniformly stirring, heating to 60 ℃, adding phenyl dichlorophosphate for reaction, heating to 150 ℃ for reaction, cooling the product to room temperature after the reaction is finished, and then crushing, washing and drying the product to obtain an intermediate 3;

and step four, mixing and stirring the intermediate 1, the intermediate 2 and the intermediate 3 according to a proportion to obtain the flame retardant.

2. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: the auxiliary agent is one or a mixture of two of E wax and OP wax in any ratio, and the antioxidant is a phenol antioxidant.

3. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: in the first step, the dosage ratio of the 2-carboxyethyl phenyl hypophosphorous acid to the distilled water is 20.5 g: 400mL, the dosage ratio of melamine and distilled water is 13.5 g: 500 mL.

4. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: in the second step, the dosage ratio of calcium chloride, N-dimethylacetamide, ethylenediamine, terephthaloyl chloride and triethylamine is 6.3 g: 180 mL: 5.5 mL: 16.35 g: 23.8 mL.

5. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: in the third step, the dosage ratio of the 4,4' -dihydroxybiphenyl, the aluminum chloride and the phenyl dichlorophosphate is 153.6 g: 1.501 g: 150 mL.

6. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: in the fourth step, the mixing mass ratio of the intermediate 1, the intermediate 2 and the intermediate 3 is 3:1: 1.

7. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: the modified ABS resin is prepared by the following steps:

step A1, mixing sodium pyrophosphate, anhydrous glucose, a ferrous sulfate solution and deionized water, stirring for dissolving, then adding a potassium hydroxide solution and an emulsifier, uniformly stirring, and stirring for reacting for 10min under the conditions of nitrogen atmosphere and constant-temperature water bath to obtain a mixed solution a;

and A2, mixing an acrylonitrile solution and a cumene hydroperoxide solution, dripping the mixed solution into the mixed solution a, heating to 75 ℃, reacting, cooling to 60 ℃, adding an antioxidant, stirring, discharging, demulsifying by using an anhydrous magnesium sulfate solution with the mass fraction of 5 per mill, curing, and finally putting the cured material and the ABS resin into a mixing roll in proportion for mixing to obtain the modified ABS resin.

8. The flame-retardant heat-resistant ABS plastic particle according to claim 7, characterized in that: in the step A1, the dosage ratio of the sodium pyrophosphate, the anhydrous glucose, the ferrous sulfate solution and the deionized water is 0.7 g: 0.9 g: 40mL:500mL, and the consumption volume ratio of the potassium hydroxide solution to the emulsifier is 1:15, wherein the emulsifier is rosin acid soap.

9. The flame-retardant heat-resistant ABS plastic particle according to claim 7, characterized in that: in step A2, the consumption volume ratio of the acrylonitrile solution to the cumene hydroperoxide solution is 10:1, and the antioxidant is 1010.

10. The flame-retardant heat-resistant ABS plastic particle according to claim 1, characterized in that: the flame-retardant heat-resistant ABS plastic particles are prepared by the following steps:

firstly, putting modified ABS resin, a flame retardant, an auxiliary agent, an antioxidant and high rubber powder into a high-speed multifunctional grinder for mixing and compounding, and putting expandable graphite into the high-speed multifunctional grinder for secondary mixing and compounding;

and secondly, putting the mixed and compounded materials into a double-screw extruder for extrusion, controlling the rotating speed of a screw to be 50r/min, naturally cooling the extruded materials, then crushing and granulating, and finally drying to obtain the flame-retardant heat-resistant ABS plastic particles.

Technical Field

The invention relates to the technical field of modified plastics, in particular to flame-retardant heat-resistant ABS plastic particles.

Background

Acrylonitrile-butadiene-styrene (ABS) has the characteristics of both the rigidity and heat resistance of acrylonitrile, the glossiness and processability of polystyrene, the impact resistance of polybutadiene and the like, and can be widely applied to the fields of household appliances, office equipment, instruments and meters, transportation, building materials, daily necessities, packaging materials and the like. However, ABS has a limiting oxygen index of only 18%, and is a flammable material. In order to improve the combustion behavior, make it flame-retardant or self-extinguish when it is exposed to fire, ABS must be flame-retardant modified. However, for the housing or parts of electric appliances such as motors, hair dryers, power boxes, microwave ovens, electric cookers, and extension sockets, the materials are required to have flame retardancy and certain heat resistance.

The invention provides a high-heat-resistance flame-retardant ABS plastic by referring to Chinese patent CN105885328A, and in the scheme, the ABS plastic with flame-retardant and heat-resistant properties is obtained by adding auxiliary agents such as an antioxidant, a heat-resistant agent, a flame retardant and the like, but the mechanical properties of the ABS plastic are greatly reduced after the ABS plastic obtains the flame-retardant and heat-resistant properties.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides flame-retardant heat-resistant ABS plastic particles, which solve the problem that the mechanical property of ABS plastic is greatly reduced after the ABS plastic obtains flame-retardant and heat-resistant properties.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a flame-retardant heat-resistant ABS plastic particle comprises the following raw materials in parts by weight: 65-80 parts of modified ABS resin, 5.2-6.5 parts of flame retardant, 0.3-0.6 part of expandable graphite, 1.6-3.5 parts of auxiliary agent, 0.8-1.5 parts of antioxidant and 2.8-4.5 parts of high rubber powder;

the flame retardant is prepared by the following steps:

step one, mixing and stirring 2-carboxyethyl phenyl hypophosphorous acid and distilled water until the 2-carboxyethyl phenyl hypophosphorous acid is completely dissolved, then dissolving melamine in the distilled water, mixing the 2-carboxyethyl phenyl hypophosphorous acid solution and the melamine solution, heating for reaction, controlling the reaction temperature to be 80 ℃, controlling the reaction time to be 3.5 hours, cooling and filtering after the reaction is finished, washing by using the distilled water, and finally drying by blowing air at 80 ℃ for 12 hours to obtain an intermediate 1;

step two, mixing and stirring calcium chloride and N, N-dimethylacetamide at 45 ℃ until the calcium chloride is completely dissolved, adding ethylenediamine, stirring and dissolving, then adding terephthaloyl chloride at 0-5 ℃, stirring and reacting for 1h, raising the temperature of a system to 50 ℃, adding triethylamine, stirring and reacting for 4h, cooling and filtering after the reaction is finished, washing by using distilled water, and finally blowing and drying for 8h at 80 ℃ to obtain an intermediate 2;

step three, mixing 4,4' -dihydroxybiphenyl and aluminum chloride, uniformly stirring, heating to 60 ℃, adding phenyl dichlorophosphate, reacting for 1h at 60 ℃, heating to 150 ℃ for reacting for 1h, cooling a product to room temperature after the reaction is finished, crushing and washing the product, and finally blowing and drying for 8h at 80 ℃ to obtain an intermediate 3;

and step four, mixing the intermediate 1, the intermediate 2 and the intermediate 3 in proportion, and stirring uniformly at 180 ℃ to obtain the flame retardant.

Preferably, the auxiliary agent is one or a mixture of two of E wax and OP wax in any ratio, and the antioxidant is a phenolic antioxidant.

Preferably, in the first step, the using ratio of the 2-carboxyethylphenylphosphinic acid to the distilled water is 20.5 g: 400mL, the dosage ratio of melamine and distilled water is 13.5 g: 500 mL.

Preferably, in the second step, the dosage ratio of calcium chloride, N-dimethylacetamide, ethylenediamine, terephthaloyl chloride and triethylamine is 6.3 g: 180 mL: 5.5 mL: 16.35 g: 23.8 mL.

Preferably, in the third step, the using amount ratio of the 4,4' -dihydroxybiphenyl to the aluminum chloride to the phenyl dichlorophosphate is 153.6 g: 1.501 g: 150 mL.

Preferably, in the fourth step, the mixing mass ratio of the intermediate 1, the intermediate 2 and the intermediate 3 is 3:1: 1.

Preferably, the modified ABS resin is prepared by the following steps:

step A1, mixing sodium pyrophosphate, anhydrous glucose, a ferrous sulfate solution and deionized water, stirring and dissolving at 40 ℃, adding a potassium hydroxide solution and an emulsifier, stirring uniformly, and stirring and reacting for 10min under the conditions of nitrogen atmosphere and a constant-temperature water bath at 65 ℃ to obtain a mixed solution a;

and A2, mixing an acrylonitrile solution and a cumene hydroperoxide solution, dropwise adding the mixture into the mixed solution a, heating to 75 ℃ for reaction for 30min, cooling to 60 ℃, adding an antioxidant, stirring for 30min, discharging, demulsifying by using an anhydrous magnesium sulfate solution with the mass fraction of 5 per mill, curing at the temperature of 90 ℃, and finally putting the cured material and the ABS resin into a mixing roll in proportion, wherein the mixing temperature is controlled to be 180 ℃, and the mixing time is 5min, so that the modified ABS resin is obtained.

Preferably, in the step A1, the ratio of the sodium pyrophosphate to the anhydrous glucose to the ferrous sulfate solution to the deionized water is 0.7 g: 0.9 g: 40mL:500mL, and the consumption volume ratio of the potassium hydroxide solution to the emulsifier is 1:15, wherein the emulsifier is rosin acid soap.

Preferably, in step A2, the consumption volume ratio of the acrylonitrile solution to the cumene hydroperoxide solution is 10:1, and the antioxidant is 1010.

Preferably, the flame-retardant heat-resistant ABS plastic particles are prepared by the following steps:

firstly, putting modified ABS resin, a flame retardant, an auxiliary agent, an antioxidant and high rubber powder into a high-speed multifunctional grinder for mixing and compounding, and putting expandable graphite into the high-speed multifunctional grinder for secondary mixing and compounding;

and secondly, putting the mixed and compounded materials into a double-screw extruder for extrusion, controlling the rotating speed of a screw to be 50r/min, setting the temperature of the double screws to five sections, crushing and granulating the extruded materials after naturally cooling at 180 ℃, 190 ℃, 195 ℃ and 200 ℃, and finally drying for 12 hours at the temperature of 80 ℃ to obtain the flame-retardant and heat-resistant ABS plastic particles.

(III) advantageous effects

Compared with the prior art, the flame-retardant heat-resistant ABS plastic particle has the following beneficial effects:

(1) dissolving 2-carboxyethylphenylphosphinic acid in distilled water, dissolving melamine in distilled water, mixing the two solutions for reaction, combining one amino group on the 2-carboxyethylphenylphosphinic acid solution with a hydroxyl group on the melamine solution, simultaneously removing one water to obtain an intermediate 1, mixing calcium chloride with N, N-dimethylacetamide, matching with other substances for reaction, removing one hydrogen ion from two amino groups on the N, N-dimethylacetamide and simultaneously removing two chloride ions of terephthaloyl chloride to realize the combination between the N, N-dimethylacetamide and the terephthaloyl chloride to obtain an intermediate 2, mixing 4,4 '-dihydroxybiphenyl with aluminum chloride, combining with the hydrogen ions of two hydroxyl groups on the 4,4' -dihydroxybiphenyl and removing two chloride ions on the dichlorophenylphosphonate, the preparation method comprises the steps of realizing the combination among 4,4 '-dihydroxy diphenyl dichlorophosphate phenyl ester to obtain an intermediate 3, finally mixing the intermediate 1, the intermediate 2 and the intermediate 3 in proportion to obtain a flame retardant, using 2-carboxyethyl phenyl hypophosphorous acid and 4' -dihydroxy diphenyl as base materials of the flame retardant, after the intermediate 1 and the intermediate 3 are applied to ABS resin, forming a carbon layer with a certain expansion degree by the intermediate 1 and the intermediate 3, covering the carbon layer on the ABS resin to have certain heat insulation and oxygen isolation functions, thereby preventing the further combustion of the composite material and increasing the flame retardant property of the ABS resin, then using the addition of the intermediate 2, reacting the intermediate 1 and the intermediate 2 to promote the char formation function of a flame retardant system, so that the carbon layer becomes more stable and continuous, and can isolate oxygen and heat more effectively, after the intermediate 2 is introduced, a compact, smooth and complete continuous layer is formed on the surface of the ABS resin, the intermediate 2 and the intermediate 1 act to promote the effective formation of a carbon layer, the quality of the surface of the carbon layer is improved, the continuous and compact carbon layer isolates heat and oxygen from permeating into the material in the combustion process, and the flame retardant efficiency of a solidified phase is greatly improved.

(2) The acrylonitrile solution and the cumene hydroperoxide solution are mixed, a mixed solution consisting of sodium pyrophosphate, anhydrous glucose, a ferrous sulfate solution and deionized water is mixed to form a modified emulsion, the modified emulsion is mixed with ABS resin after being cured to obtain modified ABS resin, the thermal weight loss performance of the modified ABS resin is improved, and simultaneously, the expandable graphite is dispersed in the ABS resin, so that the fireproof performance and the expansion performance of the plastic can be effectively enhanced, the flexibility and other physical properties of the plastic are not influenced, toxic gases, acid mist, smoke and the like are not volatilized in flame, and the danger of the ABS resin is not increased.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the flame retardant is prepared by the following steps:

step one, mixing and stirring 20.5g of 2-carboxyethyl phenyl hypophosphorous acid and 400mL of distilled water until the 2-carboxyethyl phenyl hypophosphorous acid is completely dissolved, then dissolving 13.5g of melamine in 500mL of distilled water, mixing the 2-carboxyethyl phenyl hypophosphorous acid solution and the melamine solution, heating for reaction, controlling the reaction temperature to be 80 ℃, reacting for 3.5 hours, cooling and filtering after the reaction is finished, washing by using distilled water, and finally drying by blowing air at 80 ℃ for 12 hours to obtain an intermediate 1;

step two, mixing and stirring 6.3g of calcium chloride and 180mL of N, N-dimethylacetamide at 45 ℃ until the calcium chloride is completely dissolved, adding 5.5mL of ethylenediamine, stirring and dissolving, then adding 16.35g of terephthaloyl chloride at 0-5 ℃, stirring and reacting for 1h, raising the temperature of a system to 50 ℃, adding 23.8mL of triethylamine, stirring and reacting for 4h, cooling and filtering after the reaction is finished, washing with distilled water, and finally drying by blowing air at 80 ℃ for 8h to obtain an intermediate 2;

step three, mixing 153.6g of 4,4' -dihydroxybiphenyl and 1.501g of aluminum chloride, uniformly stirring, heating to 60 ℃, adding 150mL of phenyl dichlorophosphate, reacting at 60 ℃ for 1h, heating to 150 ℃, reacting for 1h, cooling the product to room temperature after the reaction is finished, crushing and washing the product, and finally blowing and drying at 80 ℃ for 8h to obtain an intermediate 3;

and step four, mixing the intermediate 1, the intermediate 2 and the intermediate 3 according to the mass ratio of 3:1:1, and uniformly stirring at 180 ℃ to obtain the flame retardant.

Example 2:

the flame retardant is prepared by the following steps:

step one, mixing and stirring 36.3g of 2-carboxyethyl phenyl hypophosphorous acid and 600mL of distilled water until the 2-carboxyethyl phenyl hypophosphorous acid is completely dissolved, then dissolving 16.5g of melamine in 600mL of distilled water, mixing the 2-carboxyethyl phenyl hypophosphorous acid solution and the melamine solution, heating for reaction, controlling the reaction temperature to be 80 ℃, reacting for 3.5 hours, cooling and filtering after the reaction is finished, washing with distilled water, and finally drying by air blowing at 80 ℃ for 12 hours to obtain an intermediate 1;

step two, mixing and stirring 8.6g of calcium chloride and 220mL of N, N-dimethylacetamide at 45 ℃ until the calcium chloride is completely dissolved, adding 8.1mL of ethylenediamine, stirring and dissolving, then adding 19.62g of terephthaloyl chloride at 0-5 ℃, stirring and reacting for 1h, raising the temperature of a system to 50 ℃, adding 26.8mL of triethylamine, stirring and reacting for 4h, cooling and filtering after the reaction is finished, washing with distilled water, and finally drying by blowing air at 80 ℃ for 8h to obtain an intermediate 2;

step three, mixing 173.5g of 4,4' -dihydroxybiphenyl and 1.731g of aluminum chloride, uniformly stirring, heating to 60 ℃, adding 180mL of phenyl dichlorophosphate, reacting at 60 ℃ for 1h, heating to 150 ℃ for 1h, cooling the product to room temperature after the reaction is finished, crushing and washing the product, and finally blowing and drying at 80 ℃ for 8h to obtain an intermediate 3;

and step four, mixing the intermediate 1, the intermediate 2 and the intermediate 3 according to the mass ratio of 3:1:1, and uniformly stirring at 180 ℃ to obtain the flame retardant.

Example 3:

the modified ABS resin is prepared by the following steps:

step A1, mixing 0.7g of sodium pyrophosphate, 0.9g of anhydrous glucose, 40mL of ferrous sulfate solution and 500mL of deionized water, stirring and dissolving at 40 ℃, adding 0.1mL of potassium hydroxide solution and 15mL of emulsifier, stirring uniformly, and stirring and reacting for 10min under the conditions of nitrogen atmosphere and constant-temperature water bath at 65 ℃ to obtain a mixed solution a;

step A2, mixing 10mL of acrylonitrile solution and 1mL of cumene hydroperoxide solution, then dropwise adding the mixed solution into the mixed solution a, heating to 75 ℃ for reaction for 30min, cooling to 60 ℃, adding an antioxidant, stirring for 30min, discharging, demulsifying by using an anhydrous magnesium sulfate solution with the mass fraction of 5 per mill, curing at the temperature of 90 ℃, finally putting the cured material and the ABS resin into a mixing roll according to the mass ratio of 1:6, controlling the mixing temperature to be 180 ℃, and mixing for 5min to obtain the modified ABS resin.

Example 4:

the modified ABS resin is prepared by the following steps:

step A1, mixing 1.3g of sodium pyrophosphate, 1.5g of anhydrous glucose, 50mL of ferrous sulfate solution and 550mL of deionized water, stirring and dissolving at 40 ℃, adding 0.1mL of potassium hydroxide solution and 15mL of emulsifier, stirring uniformly, and stirring and reacting for 10min under the conditions of nitrogen atmosphere and constant-temperature water bath at 65 ℃ to obtain a mixed solution a;

step A2, mixing 16mL of acrylonitrile solution and 2mL of cumene hydroperoxide solution, then dropwise adding the mixed solution into the mixed solution a, heating to 75 ℃ for reaction for 30min, cooling to 60 ℃, adding an antioxidant, stirring for 30min, discharging, demulsifying by using an anhydrous magnesium sulfate solution with the mass fraction of 5 per mill, curing at the temperature of 90 ℃, finally putting the cured material and the ABS resin into a mixing roll according to the mass ratio of 1:6, controlling the mixing temperature to be 180 ℃, and mixing for 5min to obtain the modified ABS resin.

Example 5:

a flame-retardant heat-resistant ABS plastic particle comprises the following raw materials in parts by weight: 65 parts of the modified ABS resin of example 3, 5.2 parts of the flame retardant of example 1, 0.3 part of expandable graphite, 1.6 parts of an auxiliary agent, 0.8 part of an antioxidant and 2.8 parts of high rubber powder;

the flame-retardant heat-resistant ABS plastic particles are prepared by the following steps:

firstly, putting the modified ABS resin of the embodiment 3, the flame retardant, the auxiliary agent, the antioxidant and the high rubber powder of the embodiment 1 into a high-speed multifunctional pulverizer for mixing and compounding, and putting the expandable graphite into the high-speed multifunctional pulverizer for secondary mixing and compounding;

and secondly, putting the mixed and compounded materials into a double-screw extruder for extrusion, controlling the rotating speed of a screw to be 50r/min, setting the temperature of the double screws to five sections, crushing and granulating the extruded materials after naturally cooling at 180 ℃, 190 ℃, 195 ℃ and 200 ℃, and finally drying for 12 hours at the temperature of 80 ℃ to obtain the flame-retardant and heat-resistant ABS plastic particles.

Example 6:

a flame-retardant heat-resistant ABS plastic particle comprises the following raw materials in parts by weight: 80 parts of modified ABS resin of example 4, 6.5 parts of flame retardant of example 2, 0.6 part of expandable graphite, 3.5 parts of auxiliary agent, 1.5 parts of antioxidant and 4.5 parts of high rubber powder;

the flame-retardant heat-resistant ABS plastic particles are prepared by the following steps:

firstly, putting the modified ABS resin of the embodiment 4, the flame retardant, the auxiliary agent, the antioxidant and the high rubber powder of the embodiment 2 into a high-speed multifunctional pulverizer for mixing and compounding, and putting the expandable graphite into the high-speed multifunctional pulverizer for secondary mixing and compounding;

and secondly, putting the mixed and compounded materials into a double-screw extruder for extrusion, controlling the rotating speed of a screw to be 50r/min, setting the temperature of the double screws to five sections, crushing and granulating the extruded materials after naturally cooling at 180 ℃, 190 ℃, 195 ℃ and 200 ℃, and finally drying for 12 hours at the temperature of 80 ℃ to obtain the flame-retardant and heat-resistant ABS plastic particles.

Example 7:

this example differs from example 5 in that no flame retardant was added.

Example 8:

this example differs from example 5 in that an ABS resin was used instead of the modified ABS resin.

Example 9:

this example uses a commercially available ABS plastic pellet.

Example 10:

carrying out limited oxygen index test and impact performance test on the ABS plastic particles prepared in the examples 5-9, wherein the limited oxygen index is according to GB/T2046-2009 standard, a sample is vertically fixed in a combustion cylinder of a limited oxygen index tester, nitrogen-oxygen mixed gas flows through the combustion cylinder from bottom to top according to a certain proportion, an igniter is used for igniting the sample by adopting a top end ignition method, meanwhile, the combustion time and the combustion length of the sample are recorded, and the lowest oxygen concentration when the balanced combustion is just maintained is determined according to a criterion; the impact property of the test sample is tested according to the GB/T1043.1-2008 standard by using a ZBC-1400-1 type simply supported beam impact strength tester, and the test results are as follows:

TABLE 1

	Example 5	Example 6	Example 7	Example 8	Example 9
						LOI/％	26.8	25.1	18.3	19.5	18.2
Impact Properties/kJ/m2	168.56	163.25	171.65	155.62	170.26
						Flame retardant rating	V-0	V-0	V-2	V-0	V-2

As can be seen from Table 1, the LOI of the ABS plastic granules in examples 5 to 6 is from 25.1 to 26.8%, which is far better than the LOI values of examples 7 to 9 of from 18.2 to 19.5%, and the impact properties of examples 5 to 6 are from 163.25 to 168.56kJ/m²Impact properties with examples 7 to 9 of 155.62 to 171.65kJ/m²Similarly, on the flame retardant level, the flame retardant levels of the examples 5-6 and the example 8 are both V-0, and the flame retardant levels of the ABS plastic particles without the flame retardant and the ABS plastic particles sold in the market are both V-2, because the intermediate 2 promotes the char formation of the flame retardant system, the carbon layer becomes more stable and continuous, oxygen and heat can be more effectively isolated, the combustion is terminated, after the intermediate 2 is introduced, a compact, smooth and more complete continuous layer is formed on the surface of the ABS resin, the intermediate 2 and the intermediate 1 react to promote the effective formation of the carbon layer, the quality of the surface of the carbon layer is improved, and the continuous and compact carbon layer is isolated from heat and oxygen permeating into the material in the combustion process, so that the heat and the oxygen are greatly prevented from permeating into the material in the combustion processThe flame retardant efficiency of the solidified phase is improved, the dispersibility of the flame retardant complexing system in the ABS resin is improved by adding the intermediate 2, the intermediate 1 and the intermediate 3 are uniformly dispersed in the ABS resin, the toughness of the blending material is increased, and the impact strength of ABS resin particles is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.