A PVC / ABS / PC modified material and preparation method thereof

Abstract

The present invention discloses a PVC / ABS / PC modified material and a preparation method thereof, belonging to the field of polymer material technology. The PVC / ABS / PC modified material comprises the following raw materials in parts by weight: 60-80 parts PVC, 30-40 parts ABS, 10-20 parts modified PC, 5-15 parts plasticizer, 2-5 parts stabilizer, 1-2 parts lubricant, and 1-2 parts antioxidant. The plasticizer is prepared by the following method: S1: bis(2-hydroxyethyl) terephthalate reacts with oleic acid chloride to form a double-chain unsaturated compound; S2: the double-chain unsaturated compound reacts with formic acid and H2O2 to form a diepoxide; S3: the diepoxide reacts with n-octanol to form the plasticizer. The PVC / ABS / PC modified material prepared by the present invention has good tensile properties and impact strength.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a PVC / ABS / PC modified material and a preparation method thereof. Background Art

[0002] With the increasing requirements for material performance in the industrial field, polyvinyl chloride (PVC) has been widely used in automotive parts, wires and cables, sealing products and other fields due to its low cost, excellent processing performance, and chemical corrosion resistance. However, single PVC materials have problems such as poor heat resistance and toughness. ABS has excellent toughness but insufficient weather resistance; PC has high heat resistance but is prone to stress cracking and is expensive. In the existing technology, binary blending systems (such as PVC / ABS or PC / ABS) are difficult to strike a balance between performance. When developing ternary modified materials, the core contradiction lies in phase separation, weak interfacial bonding and insufficient thermal stability caused by poor component compatibility. Therefore, it is urgent to achieve a synergistic improvement in the mechanical properties and heat resistance of materials through innovative component design, plasticizer and compatibilizer optimization, so as to meet the urgent demand for high-performance materials in new energy vehicles, electronics and other fields.

[0003] Chinese invention patent publication number CN102382388A discloses a high-impact PVC / ABS alloy material and its preparation method. The invention comprises 30-80% by weight of a PVC composite material modified with active nano-calcium carbonate and 20-70% by weight of injection-grade ABS resin. The PVC composite material includes PVC resin, a heat stabilizer, a lubricant, an impact modifier, an antioxidant, a flame retardant, and an active nano-calcium carbonate filler. The preparation method involves weighing all ingredients according to the PVC composite material formula, stirring them at high speed in a high-speed mixer, adding the ABS resin, continuing mixing, feeding the material into an extruder, melt-blending and extruding, and then cutting it into pellets using a plastic pelletizer. While the alloy exhibits good flame retardancy, its impact strength still needs improvement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a PVC / ABS / PC modified material and a preparation method thereof.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A PVC / ABS / PC modified material comprises the following raw materials in parts by weight:

[0007] PVC: 60-80 parts, ABS: 30-40 parts, modified PC: 10-20 parts, plasticizer: 5-15 parts, stabilizer: 2-5 parts, lubricant: 1-2 parts, antioxidant: 1-2 parts;

[0008] The plasticizer is prepared by the following method:

[0009] S1: Bis(2-hydroxyethyl)terephthalate reacts with oleic acid chloride to form a double-chain unsaturated compound; the reaction equation is as follows:

[0010] ;

[0011] S2: Double-chain unsaturated compounds generate diepoxides under the action of formic acid and H2O2; the reaction equation is as follows:

[0012] ;

[0013] S3: The diepoxide reacts with n-octanol to form a plasticizer; the reaction equation is as follows:

[0014] ;

[0015] In step S1, the molar ratio of bis(2-hydroxyethyl)terephthalate to oleic acid chloride is 1:(2-3).

[0016] In step S2, the mass ratio of the double-chain unsaturated compound, formic acid and H2O2 is 10:(1-1.5).

[0017] In step S3, the molar ratio of the diepoxide compound to n-octanol is 1:(2-3).

[0018] The modified PC is prepared by the following method:

[0019] N1: Ethyl acrylate, 1,3-butadiene, and styrene form a copolymer under the action of an initiator;

[0020] N2: The copolymer reacts with PC under the action of a catalyst to generate modified PC. In this reaction, the ester group of the copolymer undergoes an ester exchange reaction with PC under the catalysis of dibutyltin oxide.

[0021] In step N1, the initiator is azobisisobutyronitrile; in step N2, the catalyst is dibutyltin oxide.

[0022] The stabilizer is one of JX-181 organic tin heat stabilizer, JX-107 reverse ester tin heat stabilizer, and JT-101 mercaptan antimony heat stabilizer.

[0023] The lubricant is one of N,N'-methylenebisstearamide and calcium stearate.

[0024] The antioxidant is one of antioxidant 264 and antioxidant 1076.

[0025] A method for preparing a PVC / ABS / PC modified material comprises the following steps:

[0026] (1) Weigh by weight: 60-80 parts of PVC, 30-40 parts of ABS, 10-20 parts of modified PC, 5-15 parts of plasticizer, 2-5 parts of stabilizer, 1-2 parts of lubricant, and 1-2 parts of antioxidant;

[0027] (2) The above components are added into a high-speed mixer and mixed, and then the mixture is introduced into a twin-screw extruder for extrusion and granulation, and air-cooled and sieved to obtain PVC / ABS / PC modified materials.

[0028] Due to the adoption of the above technical solution, the beneficial effects of the present invention include:

[0029] (1) In the plasticizer prepared by the present invention, the benzene ring and the matrix form physical crosslinking points through π-π stacking, which inhibits the migration of the plasticizer; the ester group forms a dipole interaction with the chlorine atom of PVC, weakening the interchain force and improving the impact strength; the branched alkyl group is inserted between the molecular chains to improve the flexibility.

[0030] (2) The modified PC prepared by the present invention improves the tensile strength and elongation at break of the material through physical entanglement with the matrix and interaction of polar groups, so that the material has good mechanical properties. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0032] Example 1 Preparation of plasticizer:

[0033] S1: Under ice bath conditions, 500 ml of dichloromethane, 0.1 mol of bis(2-hydroxyethyl)terephthalate, and 0.3 mol of triethylamine were sequentially added to a reaction kettle and stirred to mix. Under nitrogen protection, 0.2 mol of oleic acid chloride was added dropwise over 30 min. The mixture was stirred for 30 min, and the temperature was raised to reflux for 4 h. The mixture was cooled to room temperature and washed three times with saturated brine (300 ml each time). The organic phase was distilled under reduced pressure at 30°C for 1 h to obtain a double-chain unsaturated compound. Its H NMR spectrum data are as follows: 1 H NMR (300 MHz, Chloroform- d)δ7.83 (s, 4H), 5.45 (dddt, J = 5.6, 4.5, 2.0, 1.0 Hz, 4H), 4.50(td, J = 5.0, 0.9 Hz, 4H), 4.41 (td, J = 4.9, 1.0 Hz, 4H), 2.31 (t, J = 8.5Hz, 4H), 2.10 - 1.96 (m, 8H), 1.66 - 1.49 (m, 4H), 1.39 - 1.21 (m, 40H), 0.94- 0.83 (m, 6H);

[0034] S2: 600 ml of DMF, 100 g of a double-chain unsaturated compound, and 5 g of a strong acid cation exchange resin were sequentially added to a reactor. The mixture was stirred and heated to 60°C. A mixed solution of 10 g of formic acid and 30 g of 30 wt% H2O2 was added dropwise for 30 min. The reaction was continued for 8 h. The mixture was cooled to room temperature and distilled under reduced pressure at 60°C for 3 h. The mixture was washed three times with deionized water (300 ml each time) and dried under vacuum at 60°C for 10 h to obtain a diepoxide compound. The hydrogen nuclear magnetic resonance spectrum data are as follows: 1 H NMR (300 MHz, Chloroform- d )δ7.83 (s, 4H),4.50 (td, J = 5.0, 0.9 Hz, 4H), 4.45 - 4.36 (m, 4H), 3.10 (t, J = 4.3 Hz,4H), 2.31 (t, J = 8.5 Hz, 4H), 1.87 - 1.50 (m, 12H), 1.50 - 1.18 (m, 40H), 0.98 - 0.82 (m, 6H);

[0035] S3: Under nitrogen protection, 800 ml of DMF, 0.1 mol of diepoxide, and 0.2 mol of n-octanol were added to a reactor, stirred and dissolved, and the temperature was raised to 50°C. 5 g of 85 wt% phosphoric acid was added and reacted for 8 h. The mixture was cooled to room temperature and distilled under reduced pressure at 60°C for 3 h. The mixture was then recrystallized using 300 ml of acetone and dried under vacuum at 50°C for 8 h to obtain a plasticizer. The H NMR spectrum data are as follows: 1 H NMR (300MHz, Chloroform- d)δ7.83 (s, 4H), 4.50 (td, J = 5.0, 1.0 Hz, 4H), 4.41 (td, J= 5.0, 1.0 Hz, 4H), 3.65 - 3.48 (m, 6H), 3.46 - 3.35 (m, 2H), 2.39 (d, J =5.6 Hz, 2H), 2.31 (t, J = 8.5 Hz, 4H), 1.66 - 1.48 (m, 12H), 1.48 - 1.40 (m,2H), 1.40 - 1.17 (m, 62H), 0.96 - 0.82 (m, 12H).

[0036] Example 2 Preparation of plasticizer:

[0037] S1: Under ice bath conditions, 500 ml of dichloromethane, 0.1 mol of bis(2-hydroxyethyl)terephthalate, and 0.3 mol of triethylamine were added to a reaction kettle in sequence and stirred. Under nitrogen protection, 0.25 mol of oleic acid chloride was added dropwise over 30 min. The mixture was stirred for 30 min, and the temperature was raised to reflux for 5 h. The mixture was cooled to room temperature, washed three times with saturated brine (300 ml each time), and distilled under reduced pressure at 30°C for 1 h to obtain a double-chain unsaturated compound.

[0038] S2: 600 ml of DMF, 100 g of a double-chain unsaturated compound, and 5 g of a strong acid cation exchange resin were sequentially added to a reactor, heated to 70°C with stirring, and a mixed solution of 12 g of formic acid and 35 g of 30 wt% H2O2 was added dropwise for 30 min. The reaction was continued for 7 h, cooled to room temperature, and distilled under reduced pressure at 60°C for 3 h. The mixture was washed three times with deionized water (300 ml each time), and dried under vacuum at 60°C for 10 h to obtain a diepoxide compound.

[0039] S3: Under nitrogen protection, 800 ml of DMF, 0.1 mol of diepoxide, and 0.25 mol of n-octanol were added to a reactor, stirred and dissolved, and the temperature was raised to 60°C. 5 g of 85 wt% phosphoric acid was added and reacted for 6 h. The mixture was cooled to room temperature and distilled under reduced pressure at 60°C for 3 h. The mixture was then recrystallized using 300 ml of acetone and dried under vacuum at 50°C for 8 h to obtain a plasticizer.

[0040] Example 3 Preparation of plasticizer:

[0041] S1: Under ice bath conditions, 500 ml of dichloromethane, 0.1 mol of bis(2-hydroxyethyl)terephthalate, and 0.3 mol of triethylamine were added sequentially to a reaction kettle and stirred. Under nitrogen protection, 0.3 mol of oleic acid chloride was added dropwise over 30 min. The mixture was stirred for 30 min, and the temperature was raised to reflux for 6 h. The mixture was cooled to room temperature, washed three times with saturated brine (300 ml each time), and distilled under reduced pressure at 30°C for 1 h to obtain a double-chain unsaturated compound.

[0042] S2: 600 ml of DMF, 100 g of a double-chain unsaturated compound, and 5 g of a strong acid cation exchange resin were sequentially added to a reactor, heated to 80°C with stirring, and a mixed solution of 15 g of formic acid and 40 g of 30 wt% H2O2 was added dropwise for 30 min. The reaction was continued for 6 h, cooled to room temperature, and distilled under reduced pressure at 60°C for 3 h. The mixture was washed three times with deionized water (300 ml each time), and dried under vacuum at 60°C for 10 h to obtain a diepoxide compound.

[0043] S3: Under nitrogen protection, 800 ml of DMF, 0.1 mol of diepoxide, and 0.3 mol of n-octanol were added to a reactor, stirred and dissolved, and the temperature was raised to 70°C. 5 g of 85 wt% phosphoric acid was added and reacted for 5 h. The mixture was cooled to room temperature and distilled under reduced pressure at 60°C for 3 h. The mixture was then recrystallized using 300 ml of acetone and dried under vacuum at 50°C for 8 h to obtain a plasticizer.

[0044] Example 4 Preparation of modified PC:

[0045] N1: Under nitrogen protection, 300 ml of toluene, 0.2 mol of ethyl acrylate, 0.2 mol of 1,3-butadiene, 0.1 mol of styrene, and 4 g of azobisisobutyronitrile were added to a reactor in sequence and stirred to mix. The mixture was heated to 65°C and reacted for 12 h. The mixture was cooled to room temperature, and 500 ml of methanol was added and stirred to precipitate a solid. The solid was filtered and dried in a vacuum at 60°C for 8 h to obtain a copolymer.

[0046] N2: Under nitrogen protection, 500 g of copolymer, 6.4 g of dibutyltin oxide, and 300 g of PC were added to a reactor, heated to 220°C and melt-blended for 30 min, and cooled to room temperature to obtain modified PC.

[0047] Example 5 Preparation of PVC / ABS / PC modified material:

[0048] (1) Weigh 600 g of PVC, 300 g of ABS, 100 g of modified PC (prepared in Example 4), 50 g of plasticizer (prepared in Example 1), 20 g of stabilizer (JX-181 organic tin heat stabilizer), 10 g of lubricant (N,N'-methylenebisstearamide), and 10 g of antioxidant (Antioxidant 264).

[0049] (2) The above components were added to a high-speed mixer and mixed at a mixing temperature of 90°C, a mixing speed of 250 r / min, and a mixing time of 30 min. The mixture was then introduced into a twin-screw extruder for extrusion granulation. The screw speed of the screw extruder was 20 r / s, the conveying section temperature of the twin-screw extruder was 160°C, the melting section temperature was 165°C, the mixing section temperature was 170°C, and the homogenizing section temperature was 170°C. The mixture was air-cooled and sieved to obtain the PVC / ABS / PC modified material.

[0050] Example 6 Preparation of PVC / ABS / PC modified material:

[0051] (1) Weigh 700 g of PVC, 350 g of ABS, 150 g of modified PC (prepared in Example 4), 100 g of plasticizer (prepared in Example 2), 35 g of stabilizer (JX-107 reverse ester tin heat stabilizer), 15 g of lubricant (N,N'-methylene bisstearamide), and 15 g of antioxidant (antioxidant 1076).

[0052] (2) The above components were added to a high-speed mixer and mixed at a mixing temperature of 90°C, a mixing speed of 250 r / min, and a mixing time of 30 min. The mixture was then introduced into a twin-screw extruder for extrusion granulation. The screw speed of the screw extruder was 15 r / s, the conveying section temperature of the twin-screw extruder was 160°C, the melting section temperature was 165°C, the mixing section temperature was 170°C, and the homogenizing section temperature was 170°C. The mixture was air-cooled and sieved to obtain the PVC / ABS / PC modified material.

[0053] Example 7 Preparation of PVC / ABS / PC modified material:

[0054] (1) Weigh 800 g of PVC, 400 g of ABS, 200 g of modified PC (prepared in Example 4), 150 g of plasticizer (prepared in Example 3), 50 g of stabilizer (JT-101 antimony mercaptan heat stabilizer), 20 g of lubricant (calcium stearate), and 20 g of antioxidant (antioxidant 1076).

[0055] (2) The above components were added to a high-speed mixer and mixed at a mixing temperature of 90°C, a mixing speed of 250 r / min, and a mixing time of 30 min. The mixture was then introduced into a twin-screw extruder for extrusion granulation. The screw speed of the screw extruder was 10 r / s, the conveying section temperature of the twin-screw extruder was 160°C, the melting section temperature was 165°C, the mixing section temperature was 170°C, and the homogenizing section temperature was 170°C. The mixture was air-cooled and sieved to obtain the PVC / ABS / PC modified material.

[0056] Comparative Example 1

[0057] The raw material composition and process of the PVC / ABS / PC modified material are basically the same as those in Example 6, except that the plasticizer added to the components (prepared in Example 2) is replaced by an equal weight of plasticizer prepared by the following method:

[0058] The preparation method of the plasticizer is basically the same as that of Example 2, except that the bis(2-hydroxyethyl)terephthalate in step S1 is replaced by an equal molar amount of bis(2-hydroxyethyl)adipate.

[0059] Comparative Example 2

[0060] The raw material composition and process of the PVC / ABS / PC modified material are basically the same as those in Example 6, except that the plasticizer added to the components (prepared in Example 2) is replaced by an equal weight of plasticizer prepared by the following method:

[0061] The preparation method of the plasticizer is basically the same as that of Example 2, except that the bis(2-hydroxyethyl)terephthalate in step S1 is replaced by an equal molar amount of 1,4-benzenedibutanol.

[0062] Comparative Example 3

[0063] The raw material composition and process of the PVC / ABS / PC modified material are basically the same as those in Example 6, except that the plasticizer added to the components (prepared in Example 2) is replaced by an equal weight of plasticizer prepared by the following method:

[0064] The preparation method of the plasticizer is substantially the same as that of Example 2, except that n-octanol in step S3 is replaced by an equimolar amount of 1-pentadecanol.

[0065] Comparative Example 4

[0066] The raw material composition and process of the PVC / ABS / PC modified material are basically the same as those in Example 6, except that the plasticizer added to the components (prepared in Example 2) is replaced by an equal weight of plasticizer prepared by the following method:

[0067] S1: 800 ml of toluene, 0.3 mol of ethylene glycol oleate, and 0.1 mol of trimesic acid were placed in a reactor, stirred and mixed, 5 g of p-toluenesulfonic acid was added, the temperature was raised to 90°C, and the reaction was carried out for 8 h. During the reaction, the water produced by the reaction was removed through a water separator. The mixture was cooled to room temperature, and the pH was adjusted to 7 with saturated sodium bicarbonate. The organic phase was separated, and the organic phase was washed with deionized water three times (using 300 ml each time). The mixture was then distilled under reduced pressure at 60°C for 3 h to obtain an unsaturated compound.

[0068] S2: 600 ml of DMF, 100 g of an unsaturated compound, and 5 g of a strong acid cation exchange resin were sequentially added to a reactor, the temperature was raised to 70°C with stirring, and a mixed solution of 18 g of formic acid and 45 g of 30 wt% H2O2 was added dropwise for 30 min. The reaction was continued for 7 h, the mixture was cooled to room temperature, and distilled under reduced pressure at 60°C for 3 h. The mixture was washed three times with deionized water (300 ml each time), and dried under vacuum at 60°C for 10 h to obtain a triepoxide.

[0069] S3: Under nitrogen protection, 800 ml of DMF, 0.1 mol of triepoxide, and 0.25 mol of n-octanol were added to the reactor, stirred and dissolved, and the temperature was raised to 60°C. 6 g of 85 wt% phosphoric acid was added and reacted for 6 h. The mixture was cooled to room temperature and distilled under reduced pressure at 60°C for 3 h. The mixture was then recrystallized using 300 ml of acetone and dried under vacuum at 50°C for 8 h to obtain a plasticizer.

[0070] Comparative Example 5

[0071] The raw material composition and process of the PVC / ABS / PC modified material are basically the same as those in Example 6, except that the modified PC (prepared in Example 4) added to the components is replaced by an equal weight mixture prepared by the following method:

[0072] The copolymer (prepared in step N1 of Example 4) was mixed with PC in a weight ratio of 5:3 to obtain a mixture.

[0073] Comparative Example 6

[0074] The raw material composition and process of the PVC / ABS / PC modified material are basically the same as those in Example 6, except that the modified PC (prepared in Example 4) added to the components is replaced with an equal mass of modified PC prepared by the following method:

[0075] The preparation method of modified PC is basically the same as that of Example 4, except that the amount of ethyl acrylate added in step N1 is replaced with 0.05 mol.

[0076] The brand of PVC used in Examples 5-7 and Comparative Examples 1-6 of the present application is SG-5, the brand of ABS is POLYLAC® PA-765A, the brand of PC is Makrolon® PC 2807, and the model of strong acid cation exchange resin is D072.

[0077] The PVC / ABS / PC modified materials prepared in Examples 5-7 and Comparative Examples 1-6 were subjected to tensile strength, elongation at break and notched impact strength tests.

[0078] The tensile strength and elongation at break were tested in accordance with GB / T 528-2009 at a tensile speed of 100 mm / min using a type 1 dumbbell specimen. The notched impact strength was tested in accordance with GB / T 1843-2008 using a V-notch specimen prepared by a notch sample making machine. The test results are shown in Table 1.

[0079] Table 1 Performance test data table

[0080]

[0081] It can be seen from Examples 5, 6 and 7 in Table 1 that the PVC / ABS / PC modified material prepared by the present invention has excellent tensile properties and notched impact strength.

[0082] The benzene ring structures in the plasticizer prepared in this application form physical crosslinks with those in ABS through π-π stacking, effectively anchoring the plasticizer molecules and inhibiting their migration within the polymer matrix. The ester groups (-COO-) form dipole-dipole interactions with the chlorine atoms on the PVC molecular chains, weakening the forces between the PVC molecular chains and improving impact strength. The branched alkyl groups can insert between polymer molecular chains, increasing the distance between them and effectively improving the material's elongation at break. The hydroxyl groups can form strong hydrogen bonds with the chlorine atoms of PVC or the nitrile groups of ABS, enhancing interfacial bonding and, combined with flexible ether bonds, synergistically improving the material's mechanical properties. The plasticizer used in Comparative Example 2 contains fewer polar ester groups, resulting in a poor ability to weaken molecular chain interactions and a poor plasticizing effect. The plasticizer used in Comparative Example 3 has an increased alkyl chain length, resulting in a decreased proportion of polar groups. Furthermore, excessively long alkyl chains have low compatibility with the PVC matrix, resulting in decreased impact strength. The plasticizer used in Comparative Example 4 has three polar ester side chains. The molecular entanglement effect reduces the dispersibility of the plasticizer in the mixed system, thereby causing a decrease in mechanical properties.

[0083] The polar ester groups in the modified PC prepared in the present application interact with the chlorine atoms of PVC and the nitrile groups of ABS through electrostatic or dipole-dipole interactions, and the benzene ring structure interacts with the benzene ring structure of the ABS matrix through π-π stacking. The two work synergistically to improve the interfacial compatibility, thereby improving the mechanical properties of the material.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. However, any equivalent changes, modifications and evolutions made by ordinary technicians in this field without departing from the scope of the technical solution of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A PVC / ABS / PC modified material, characterized in that: The composition comprises the following raw materials in parts by weight: PVC: 60-80 parts, ABS: 30-40 parts, modified PC: 10-20 parts, plasticizer: 5-15 parts, stabilizer: 2-5 parts, lubricant: 1-2 parts, antioxidant: 1-2 parts; The plasticizer is prepared by the following method: S1: Bis(2-hydroxyethyl)terephthalate reacts with oleic acid chloride to form a double-chain unsaturated compound. S2: Double-chain unsaturated compounds generate diepoxides under the action of formic acid and H2O2. S3: diepoxide reacts with n-octanol to form a plasticizer; The modified PC is prepared by the following method: N1: Ethyl acrylate, 1,3-butadiene and styrene generate a copolymer under the action of an initiator. N2: The copolymer and PC react under the action of a catalyst to form modified PC; In step N1, the molar ratio of ethyl acrylate, 1,3-butadiene, and styrene is 2:2:

1. In step N2, the mass ratio of the copolymer to PC is 5:

3.

2. A PVC / ABS / PC modified material according to claim 1, characterized in that: In step S1, the molar ratio of bis(2-hydroxyethyl)terephthalate to oleic acid chloride is 1:(2-3).

3. A PVC / ABS / PC modified material according to claim 1, characterized in that: In step S2, the mass ratio of the double-chain unsaturated compound to formic acid is 10:(1-1.5).

4. A PVC / ABS / PC modified material according to claim 1, characterized in that: In step S3, the molar ratio of the diepoxide compound to n-octanol is 1:(2-3).

5. The PVC / ABS / PC modified material according to claim 1, characterized in that: In step N1, the initiator is azobisisobutyronitrile; in step N2, the catalyst is dibutyltin oxide.

6. A PVC / ABS / PC modified material according to claim 1, characterized in that: The stabilizer is one of JX-181 organic tin heat stabilizer, JX-107 reverse ester tin heat stabilizer, and JT-101 mercaptan antimony heat stabilizer.

7. The PVC / ABS / PC modified material according to claim 1, characterized in that: The lubricant is one of N,N'-methylenebisstearamide and calcium stearate.

8. The PVC / ABS / PC modified material according to claim 1, characterized in that: The antioxidant is one of antioxidant 264 and antioxidant 1076.

9. A method for preparing the PVC / ABS / PC modified material according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Weigh by weight: 60-80 parts of PVC, 30-40 parts of ABS, 10-20 parts of modified PC, 5-15 parts of plasticizer, 2-5 parts of stabilizer, 1-2 parts of lubricant, and 1-2 parts of antioxidant; (2) The above components are added into a high-speed mixer and mixed, and then the mixture is introduced into a twin-screw extruder for extrusion and granulation, and air-cooled and sieved to obtain PVC / ABS / PC modified materials.

Images