CN109666277B - Fiber-reinforced extinction flame-retardant PC/ABS alloy and preparation method thereof - Google Patents
Fiber-reinforced extinction flame-retardant PC/ABS alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a fiber reinforced extinction flame-retardant PC/ABS alloy and a preparation method thereof, wherein the fiber reinforced extinction flame-retardant PC/ABS alloy comprises the following components in parts by weight: 40-50 parts of PC resin, 20-30 parts of ABS resin, 10-15 parts of DOPO-based nitrogen-phosphorus flame retardant, 5-10 parts of kevlar chopped fiber, 15-30 parts of calcium silicate powder, 3-6 parts of silicon dioxide matting powder, 3-8 parts of toughening agent, 0.5-1 part of hyperbranched resin and 0.2-1 part of antioxidant. The fiber-reinforced delustering flame-retardant PC/ABS alloy disclosed by the invention is good in mechanical property, free of fiber floating phenomenon, good in flame-retardant effect, low in glossiness and obvious in matte effect, and the flame-retardant grade reaches V0 grade.
Description
Technical Field
The invention relates to a fiber-reinforced extinction flame-retardant PC/ABS alloy and a preparation method thereof, belonging to the technical field of plastic alloys.
Background
With the continuous high-speed development of economy in China, the market demand potential of plastic alloys in China is huge in recent years, and particularly the high-speed growth of electronic communication, automobile and building industries can pull the rapid development of engineering plastic alloy industries in China. However, the plastic alloy research and production in China are in sporadic dispersion state, the scale is not formed, the overall level of the industry is low, and the method is far from the foreign advanced level. The level of plastic alloy research and development and processing technology in China needs to be improved.
The PC/ABS plastic alloy obtained by melting and blending the PC and the ABS can form complementation in performance, the plastic alloy has the excellent performances of the PC and the ABS simultaneously, such as heat resistance, impact strength and tensile strength superior to those of the ABS, the melt viscosity is lower than that of the PC, the processability is better than that of the PC, the sensitivity of the internal stress and the impact strength of a product to the thickness of the product is greatly reduced, the stress cracking condition of the PC is reduced, and the production cost is reduced. Therefore, the PC/ABS plastic alloy is widely applied to the fields of automobiles, machinery, household appliances, computers, communication equipment, office equipment and the like. However, the PC/ABS plastic alloy is also limited by the defects of PC and ABS resin, and the flame retardant property of the PC/ABS plastic alloy is lower than that of PC, so that the PC/ABS plastic alloy can be ensured to be applied to the fields of electronics, electricity, automobiles and the like with flame retardant requirements only by flame retardant modification.
The PC and/or ABS resin flame retardants with a large amount of consumption at present mainly comprise halogen flame retardants, antimony flame retardants and the like, but the flame retardants have the problems of high price, difficult processing, high pollution and the like, and some flame retardants can cause poor flowability and poor color of resin materials, wherein the bromine small-molecule flame retardants with the largest amount of consumption in industry have disputes due to the fact that products after combustion have great harm to the environment.
In addition, the ordinary PC/ABS plastic alloy has high glossiness, brings good visual perception to people, but brings the problem of light pollution, and products with sub-smooth surfaces are more and more popular with the improvement of the requirements of people on living quality and the deepening of the environmental protection idea, so that the PC/ABS plastic alloy needs to be modified properly to enable the surfaces of the PC/ABS plastic alloy to present the sub-smooth effect.
Furthermore, Glass Fiber (GF) reinforced PC/ABS alloy is widely used in the industry, but the problem of fiber floating on the surface of a product cannot be well controlled due to the existence of GF, and the phenomenon of fiber floating still occurs even under the process condition of adopting a steam mold.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the technical problems of poor flame retardant property, high glossiness and fiber floating on the surface of a product of the existing PC/ABS alloy, a fiber reinforced extinction flame retardant PC/ABS alloy and a preparation method thereof are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a fiber reinforced extinction flame-retardant PC/ABS alloy comprises the following components in parts by weight: 40-50 parts of PC resin, 20-30 parts of ABS resin and 10 parts of DOPO-based nitrogen-phosphorus flame retardant15 parts of kevlar chopped fiber, 5-10 parts of calcium silicate powder, 15-30 parts of silicon dioxide matting powder, 3-8 parts of toughening agent, 0.5-1 part of hyperbranched resin and 0.2-1 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
wherein R is1Is a hydrogen atom, R2Is a hydrogen atom, or R1Is a hydrogen atom, R2Is hydroxy, or R1Is hydroxy, R2Is a hydrogen atom.
Preferably, the PC resin has a melt index of 10-25 g/10min (300 ℃, 1.2kg), the ABS resin has a melt index of 15-30 g/10min (220 ℃, 10kg), and the water content of the PC resin and the ABS resin is not more than 0.05 wt%.
Preferably, the silica matting powder is a silica matting agent surface-treated with a silane coupling agent or a high molecular weight polyethylene wax.
Preferably, the calcium silicate powder is calcium silicate powder subjected to surface treatment by a silane coupling agent, and the general formula of the silane coupling agent is YSiX3X is methoxy or ethoxy, Y contains amino or epoxy.
Preferably, said kevlar chopped fibres have a length of 1-3mm and a diameter not exceeding 15 μm.
Preferably, the hyperbranched resin is a polyester or polyamide type hyperbranched resin, preferably of the Hyper C100, Hyper HPN202 and Hyper H40 series, the Hyper H40 series including Hyper H401, Hyper H402, Hyper H403.
Preferably, the toughening agent is a core-shell impact modifier of the MBS type.
Preferably, the antioxidant is formed by blending hindered phenol antioxidant and phosphite antioxidant in a mass ratio of 2: 3-3: 2.
Preferably, the hindered phenol antioxidant is octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] or 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene.
Preferably, the phosphite antioxidant is one or more of tetrakis (2, 4-di-tert-butylphenol) 4,4 '-biphenyldiphosphite, tris (2, 4-di-tert-butyl) phenyl phosphite and 4,4' -thiobis (6-tert-butyl-3-methylphenol).
The invention also provides a preparation method of the fiber-reinforced extinction flame-retardant PC/ABS alloy, which comprises the following preparation steps:
uniformly blending PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, calcium silicate powder, silicon dioxide matting powder, toughening agent, hyperbranched resin and antioxidant to obtain premixed raw materials, and then adding the premixed raw materials into a double-screw extruder for mixing, extruding and granulating to obtain the fiber-reinforced matting flame-retardant PC/ABS alloy.
Preferably, before preparing the premixed raw material, the calcium silicate powder is subjected to surface treatment by using a silane coupling agent, and the surface treatment method comprises the following steps: and (3) atomizing and spraying silane coupling agent solution into the calcium silicate powder while stirring the calcium silicate powder, and drying the obtained calcium silicate powder with the silane coupling agent infiltrated on the surface.
Preferably, the screw rotating speed of the double-screw extruder is 300-600r/min, and the extrusion temperature is 210-245 ℃.
The invention has the beneficial effects that:
the novel PC/ABS alloy provided by the invention has the advantages of good mechanical property, no fiber floating phenomenon, good flame retardant effect, low glossiness and obvious matte effect; the preparation method is simple and easy to implement, easy to process and form and low in cost, and has the following specific beneficial effects:
(1) the fiber-reinforced delustering flame-retardant PC/ABS alloy adopts a nitrogen-phosphorus-based flame retardant which is halogen-free, smokeless and nontoxic, has good thermal stability and better and more lasting flame retardant property, and effectively improves the flame retardance of the PC/ABS alloy.
(2) The Kevlar chopped fiber is added into the fiber-reinforced delustering flame-retardant PC/ABS alloy, so that the strength, the thermal stability and the dimensional stability of the PC/ABS alloy can be effectively improved, the problem of surface fiber floating caused by glass fiber filler can be solved, and the melt flowability of the PC/ABS alloy can be better.
(3) The silicon dioxide extinction powder selected by the invention can be uniformly distributed in a PC/ABS alloy matrix, and can generate a low-gloss matte effect; the calcium silicate powder can also generate an extinction effect and is beneficial to the dispersion of the silicon dioxide extinction powder, the optimal matte effect is generated by the matching use of the silicon dioxide extinction powder and the calcium silicate powder, and the strength and the dimensional stability of the PC/ABS alloy can be effectively improved by the calcium silicate powder.
(4) The hyperbranched resin adopted by the invention has a highly branched structure (a main chain is short, and a plurality of branched chains are provided), has larger molecular weight, can not be intertwined with other long molecular chains, is easy to move among macromolecules, can effectively reduce the melt viscosity by a small amount, is difficult to separate out from a solid polymer, can improve the reduction of the melt flow rate caused by adding Kevlar chopped fibers and calcium silicate powder, and can reduce the exposure of the fibers.
(5) The MBS core-shell type impact modifier is selected as the toughening agent, has good compatibility with the matrix resin, is very favorable for being dispersed in the matrix, and can fully exert the toughening effect on PC/ABS alloy.
(6) According to the invention, the hindered phenol antioxidant and the phosphite antioxidant are selected to be matched for use, and the compounded antioxidants complement each other in the aspect of antioxidation, so that the thermal oxidation stability of the PC/ABS alloy can be synergistically improved.
Detailed Description
The present invention will now be described in further detail.
Example 1
The embodiment provides a fiber reinforced extinction flame-retardant PC/ABS alloy which comprises the following components in parts by weight: 45 parts of PC resin, 25 parts of ABS resin, 12 parts of DOPO-based nitrogen-phosphorus flame retardant, 7 parts of kevlar chopped fiber, 20 parts of calcium silicate powder, 5 parts of silicon dioxide matting powder, 5 parts of toughening agent, 0.7 part of hyperbranched resin and 0.5 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
the PC resin has a melt index of 20g/10min (300 ℃, 1.2kg)) The melt index of the ABS resin is 20g/10min (220 ℃, 10kg), and the water content of the PC resin and the ABS resin is not more than 0.05 wt%; the silicon dioxide matting powder is Desmoset silicon dioxide matting powder OK 412; the calcium silicate powder is calcium silicate powder subjected to surface treatment by using a silane coupling agent, and the structural formula of the silane coupling agent is NH2(CH2)3Si(OC2H5)3(ii) a The length of the kevlar chopped fiber is 1-3mm, and the diameter is not more than 15 μm; the hyperbranched resin is Hyper C100; the toughening agent is Rohm and Hass EXL-2620; the antioxidant is prepared by blending beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester and tetra (2, 4-di-tert-butylphenol) 4,4' -biphenyl diphosphite in a mass ratio of 1: 1.
The preparation method of the fiber-reinforced delustering flame-retardant PC/ABS alloy comprises the following steps:
stirring and mixing calcium silicate powder at the speed of 500r/min, spraying atomized coupling agent solution, drying the calcium silicate powder with the coupling agent infiltrated on the surface at the temperature of 120 ℃ for 2 hours, and cooling to normal temperature to obtain modified calcium silicate powder;
stirring and mixing PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, modified calcium silicate powder, silicon dioxide matting powder, toughening agent, hyperbranched resin and antioxidant at the speed of 600r/min for 8 minutes to obtain a premixed raw material;
adding the premixed raw materials into a double-screw extruder for mixing, extruding and granulating to obtain the flame-retardant matte ABS composite material, wherein the temperature of each section of the double-screw extruder is set as follows: 210 ℃ in the first zone, 225 ℃ in the second zone, 230 ℃ in the third zone, 240 ℃ in the fourth zone, 245 ℃ in the fifth zone, 240 ℃ in the sixth zone, 235 ℃ in the seventh zone, 230 ℃ in the eighth zone, 225 ℃ in the ninth zone, 220 ℃ in the tenth zone, 215 ℃ in the eleventh zone, 240 ℃ in the head, and 500r/min in the rotation speed of the screw.
Example 2
The embodiment provides a fiber reinforced extinction flame-retardant PC/ABS alloy which comprises the following components in parts by weight: 40 parts of PC resin, 20 parts of ABS resin, 10 parts of DOPO-based nitrogen-phosphorus flame retardant, 5 parts of kevlar chopped fiber, 15 parts of calcium silicate powder, 3 parts of silicon dioxide matting powder, 3 parts of toughening agent and hyperbranched resin0.5 part of antioxidant and 0.2 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
the melt index of the PC resin is 10g/10min (300 ℃, 1.2kg), the melt index of the ABS resin is 15g/10min (220 ℃, 10kg), and the water content of the PC resin and the ABS resin is not more than 0.05 wt%; the silicon dioxide matting powder is Desmosai silicon dioxide matting powder OK 520; the calcium silicate powder is calcium silicate powder subjected to surface treatment by using a silane coupling agent, and the structural formula of the silane coupling agent is NH2(CH2)3Si(OC2H5)3(ii) a The length of the kevlar chopped fiber is 1-3mm, and the diameter is not more than 15 μm; the hyperbranched resin is Hyper HPN 202; the toughening agent is Rohm and Hass EXL-2620; the antioxidant is prepared from beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester and tri [2, 4-di-tert-butylphenyl ] phenyl ester in a mass ratio of 1: 1]Phosphite ester is blended.
The preparation method of the fiber-reinforced delustering flame-retardant PC/ABS alloy comprises the following steps:
spraying atomized coupling agent solution into calcium silicate powder while stirring and mixing the calcium silicate powder at the speed of 300r/min, then drying the calcium silicate powder with the coupling agent soaked on the surface at the temperature of 80 ℃ for 4 hours, and cooling to normal temperature to obtain modified calcium silicate powder;
stirring and mixing PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, modified calcium silicate powder, silicon dioxide matting powder, toughening agent, hyperbranched resin and antioxidant for 5 minutes at the speed of 800r/min to obtain a premixed raw material;
adding the premixed raw materials into a double-screw extruder for mixing, extruding and granulating to obtain the flame-retardant matte ABS composite material, wherein the temperature of each section of the double-screw extruder is set as follows: 210 ℃ in the first zone, 225 ℃ in the second zone, 230 ℃ in the third zone, 240 ℃ in the fourth zone, 245 ℃ in the fifth zone, 240 ℃ in the sixth zone, 235 ℃ in the seventh zone, 230 ℃ in the eighth zone, 225 ℃ in the ninth zone, 220 ℃ in the tenth zone, 215 ℃ in the eleventh zone, 240 ℃ in the head, and 600r/min in the rotation speed of the screw.
Example 3
The embodiment provides a fiber reinforced extinction flame-retardant PC/ABS alloy which comprises the following components in parts by weight: 50 parts of PC resin, 30 parts of ABS resin, 15 parts of DOPO-based nitrogen-phosphorus flame retardant, 10 parts of kevlar chopped fiber, 30 parts of calcium silicate powder, 6 parts of silicon dioxide matting powder, 8 parts of toughening agent, 1 part of hyperbranched resin and 1 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
the melt index of the PC resin is 25g/10min (300 ℃, 1.2kg), the melt index of the ABS resin is 30g/10min (220 ℃, 10kg), and the water content of the PC resin and the ABS resin is not more than 0.05 wt%; the silicon dioxide matting powder is cobia silica matting powder E-170; the calcium silicate powder is calcium silicate powder subjected to surface treatment by a silane coupling agent, and the silane coupling agent has a structure
The length of the kevlar chopped fiber is 1-3mm, and the diameter is not more than 15 μm; the hyperbranched resin is Hyper H40; the toughening agent is Rohm and Haas EXL-2690; the antioxidant is prepared from beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid octadecyl ester and tri [2, 4-di-tert-butylphenyl ] phenyl ester in a mass ratio of 1: 1]Phosphite ester is blended.
The preparation method of the fiber-reinforced delustering flame-retardant PC/ABS alloy comprises the following steps:
stirring and mixing calcium silicate powder at the speed of 600r/min, spraying atomized coupling agent solution, drying the calcium silicate powder with the coupling agent infiltrated on the surface at the temperature of 100 ℃ for 3 hours, and cooling to normal temperature to obtain modified calcium silicate powder;
stirring and mixing PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, modified calcium silicate powder, silicon dioxide matting powder, toughening agent, hyperbranched resin and antioxidant at the speed of 500r/min for 10 minutes to obtain a premixed raw material;
adding the premixed raw materials into a double-screw extruder for mixing, extruding and granulating to obtain the flame-retardant matte ABS composite material, wherein the temperature of each section of the double-screw extruder is set as follows: 210 ℃ in the first zone, 225 ℃ in the second zone, 230 ℃ in the third zone, 240 ℃ in the fourth zone, 245 ℃ in the fifth zone, 240 ℃ in the sixth zone, 235 ℃ in the seventh zone, 230 ℃ in the eighth zone, 225 ℃ in the ninth zone, 220 ℃ in the tenth zone, 215 ℃ in the eleventh zone, 240 ℃ in the head, and 300r/min in the rotation speed of the screw.
Example 4
The embodiment provides a fiber reinforced extinction flame-retardant PC/ABS alloy which comprises the following components in parts by weight: 50 parts of PC resin, 20 parts of ABS resin, 10 parts of DOPO-based nitrogen-phosphorus flame retardant, 10 parts of kevlar chopped fiber, 15 parts of calcium silicate powder, 6 parts of silicon dioxide matting powder, 3 parts of toughening agent, 1 part of hyperbranched resin and 0.2 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
the melt index of the PC resin is 15g/10min (300 ℃, 1.2kg), the melt index of the ABS resin is 20g/10min (220 ℃, 10kg), and the water content of the PC resin and the ABS resin is not more than 0.05 wt%; the silicon dioxide matting powder is Dongcao silicon dioxide matting powder E-1009; the calcium silicate powder is calcium silicate powder subjected to surface treatment by using a silane coupling agent, and the structural formula of the silane coupling agent is NH2CH2Si(OCH3)3(ii) a The length of the kevlar chopped fiber is 1-3mm, and the diameter is not more than 15 μm; the hyperbranched resin is Hyper H401; the toughening agent is Rohm and Hass EXL-2620; the antioxidant is prepared by blending 4, 6-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene and 4,4' -thiobis (6-tert-butyl-3-methylphenol) in a mass ratio of 2: 3.
The preparation method of the fiber-reinforced delustering flame-retardant PC/ABS alloy comprises the following steps:
stirring and mixing calcium silicate powder at the speed of 500r/min, spraying atomized coupling agent solution, drying the calcium silicate powder with the coupling agent infiltrated on the surface at the temperature of 130 ℃ for 2 hours, and cooling to normal temperature to obtain modified calcium silicate powder;
stirring and mixing PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, modified calcium silicate powder, silicon dioxide matting powder, toughening agent, hyperbranched resin and antioxidant at the speed of 600r/min for 8 minutes to obtain a premixed raw material;
adding the premixed raw materials into a double-screw extruder for mixing, extruding and granulating to obtain the flame-retardant matte ABS composite material, wherein the temperature of each section of the double-screw extruder is set as follows: 210 ℃ in the first zone, 225 ℃ in the second zone, 230 ℃ in the third zone, 240 ℃ in the fourth zone, 245 ℃ in the fifth zone, 240 ℃ in the sixth zone, 235 ℃ in the seventh zone, 230 ℃ in the eighth zone, 225 ℃ in the ninth zone, 220 ℃ in the tenth zone, 215 ℃ in the eleventh zone, 240 ℃ in the head, and the rotation speed of the screw is 400 r/min.
Example 5
The embodiment provides a fiber reinforced extinction flame-retardant PC/ABS alloy which comprises the following components in parts by weight: 40 parts of PC resin, 30 parts of ABS resin, 12 parts of DOPO-based nitrogen-phosphorus flame retardant, 10 parts of kevlar chopped fiber, 20 parts of calcium silicate powder, 5 parts of silicon dioxide matting powder, 8 parts of toughening agent, 1 part of hyperbranched resin and 0.5 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
the melt index of the PC resin is 20g/10min (300 ℃, 1.2kg), the melt index of the ABS resin is 20g/10min (220 ℃, 10kg), and the water content of the PC resin and the ABS resin is not more than 0.05 wt%; the silicon dioxide matting powder is Dongcao silicon dioxide matting powder E-1009; the calcium silicate powder is calcium silicate powder subjected to surface treatment by a silane coupling agent, and the structural formula of the silane coupling agent is shown in the specification
The length of the kevlar chopped fiber is 1-3mm, and the diameter is not more than 15 μm; the hyperbranched resin is Hyper H403; the toughening agent is Rohm and Haas EXL-2690; the antioxidant is prepared from tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with the mass ratio of 3: 2]Pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite.
The preparation method of the fiber-reinforced delustering flame-retardant PC/ABS alloy comprises the following steps:
stirring and mixing calcium silicate powder at the speed of 500r/min, spraying atomized coupling agent solution, drying the calcium silicate powder with the coupling agent infiltrated on the surface at the temperature of 120 ℃ for 2 hours, and cooling to normal temperature to obtain modified calcium silicate powder;
stirring and mixing PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, modified calcium silicate powder, silicon dioxide matting powder, toughening agent, hyperbranched resin and antioxidant at the speed of 600r/min for 8 minutes to obtain a premixed raw material;
adding the premixed raw materials into a double-screw extruder for mixing, extruding and granulating to obtain the flame-retardant matte ABS composite material, wherein the temperature of each section of the double-screw extruder is set as follows: 210 ℃ in the first zone, 225 ℃ in the second zone, 230 ℃ in the third zone, 240 ℃ in the fourth zone, 245 ℃ in the fifth zone, 240 ℃ in the sixth zone, 235 ℃ in the seventh zone, 230 ℃ in the eighth zone, 225 ℃ in the ninth zone, 220 ℃ in the tenth zone, 215 ℃ in the eleventh zone, 240 ℃ in the head, and 600r/min in the rotation speed of the screw.
The product properties of examples 1-5 were tested by testing the tensile strength of the product according to ISO Standard 527, the flexural strength of the product according to ISO Standard 178, the notched impact strength of the product according to ISO Standard 179-1 eA, the flame retardancy of the product according to UL Standard 94, and the gloss of the product according to GB/T8807 using a 60 ℃ gloss meter. The results of the product performance tests of examples 1-5 are shown in Table 1.
TABLE 1 product Performance test results for examples 1-5
Comparison of the product performance test results of examples 1-5 shows that: the fiber-reinforced delustering flame-retardant PC/ABS alloy has good mechanical property, no fiber floating phenomenon, good flame-retardant effect, flame-retardant grade reaching V0 grade, low glossiness and obvious matte effect.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. The fiber-reinforced extinction flame-retardant PC/ABS alloy is characterized by comprising the following components in parts by weight: 40-50 parts of PC resin, 20-30 parts of ABS resin, 10-15 parts of DOPO-based nitrogen-phosphorus flame retardant, 5-10 parts of kevlar chopped fiber, 15-30 parts of calcium silicate powder, 3-6 parts of silicon dioxide matting powder, 3-8 parts of MBS core-shell type impact modifier, 0.5-1 part of polyamide type hyperbranched resin and 0.2-1 part of antioxidant; the DOPO-based nitrogen-phosphorus flame retardant has the following structural formula:
wherein R is1Is a hydrogen atom, R2Is a hydrogen atom, or R1Is a hydrogen atom, R2Is hydroxy, or R1Is hydroxy, R2Is a hydrogen atom; the calcium silicate powder is calcium silicate powder subjected to surface treatment by a silane coupling agent.
2. The fiber-reinforced delustering flame-retardant PC/ABS alloy as claimed in claim 1, wherein the melt index of the PC resin is 10-25 g/10min, the melt index of the ABS resin is 15-30 g/10min, and the water content of the PC resin and the ABS resin is not more than 0.05 wt%.
3. The fiber reinforced delustering flame retardant PC/ABS alloy of claim 1 or 2, wherein the silica delustering powder is a silica delustering powder surface-treated with a silane coupling agent or a high molecular weight polyethylene wax.
4. The fiber reinforced delustering flame retardant PC/ABS alloy of claim 1 or 2, wherein the silane coupling agent has a general formula of YSiX3X is methoxy or ethoxy, Y contains amino or epoxy.
5. The fiber reinforced delustering flame retardant PC/ABS alloy of claim 1 or 2, wherein the kevlar chopped fibers have a length of 1-3mm and a diameter of not more than 15 μm.
6. The fiber reinforced delustering flame retardant PC/ABS alloy as claimed in claim 1 or 2, wherein the antioxidant is prepared by blending a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 2: 3-3: 2, the hindered phenol antioxidant is octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] or 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, and the phosphite antioxidant is one or more of tetra (2, 4-di-tert-butylphenol) 4,4 '-biphenyldiphosphite, tri (2, 4-di-tert-butyl) phenyl phosphite and 4,4' -thiobis (6-tert-butyl-3-methylphenol).
7. A method for preparing the fiber reinforced extinction flame-retardant PC/ABS alloy according to any one of claims 1 to 6, which is characterized by comprising the following steps: uniformly blending PC resin, ABS resin, DOPO-based nitrogen-phosphorus flame retardant, kevlar chopped fiber, calcium silicate powder, silicon dioxide matting powder, MBS core-shell type impact modifier, polyamide type hyperbranched resin and antioxidant to obtain premixed raw materials, adding the premixed raw materials into a double-screw extruder, mixing, extruding and granulating to obtain the fiber-reinforced matting flame-retardant PC/ABS alloy, wherein the screw rotating speed of the double-screw extruder is 300-600r/min, and the extrusion temperature is 210-245 ℃.
8. The preparation method of the fiber-reinforced delustering flame-retardant PC/ABS alloy as claimed in claim 7, wherein before the premixed raw material is prepared, the calcium silicate powder is subjected to surface treatment by using a silane coupling agent, and the surface treatment method comprises the following steps: and (3) atomizing and spraying silane coupling agent solution into the calcium silicate powder while stirring the calcium silicate powder, and drying the obtained calcium silicate powder with the silane coupling agent infiltrated on the surface.
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