A polycarbonate type impact resistant agent

Abstract

A polycarbonate type impact resistant agent and its preparation method, belonging to the technical field of material modification additives. The impact resistant agent has the following structure: n —C, where A is a polycarbonate chain, n is 2-4, and C is a multi-head initiator residue. The polycarbonate chain has a block structure of soft and rigid segments, with one end of the soft segment connected to the multi-head initiator residue and the other end connected to the rigid segment. The soft segment is one or more of a polycarbonate segment composed of BGE and CO2, a polycarbonate segment composed of AGE and CO2, PEO, or PPO. The rigid segment is a PE segment composed of an epoxy compound and phthalic anhydride, or / and a polycarbonate segment composed of cyclohexene oxide and CO2. The present invention does not precipitate when mixed with PVC, and its processing temperature is compatible with PVC. When blended with PVC, it can meet toughening and impact resistance requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of material modification additives, and particularly relates to a polycarbonate type impact resister. Background Art

[0002] Polyvinyl chloride (PVC) is a widely used plastic material with excellent chemical and water resistance and electrical insulation properties. It is commonly used in a variety of products, including pipes, wire insulation, credit cards, ID cards, window frames, toys, and medical devices. PVC can be categorized as either rigid or flexible. Rigid PVC is commonly used in construction materials, such as pipes and window frames, due to its high mechanical strength and weather resistance. Flexible PVC, on the other hand, is often used in wire insulation, hoses, blood bags, and other applications due to its flexibility and elasticity.

[0003] Polyvinyl chloride (PVC) is a hard and brittle material with relatively poor impact strength, typically only 3-5 kJ / m. To improve PVC's impact resistance, impact modifiers are often added. These modifiers primarily include chlorinated polyethylene (CPE), polyacrylates (ACRs), ethylene-vinyl acetate (EVA), methyl methacrylate-butadiene-styrene (MBS) graft copolymers, and acrylonitrile-butadiene-styrene (ABS).

[0004] An existing patent (CN202210223316.1) relates to an acrylic ester impact modifier for transparent PVC products and its preparation method. This modifier is prepared through step-by-step polymerization, enabling control over the structure and size of the reactant particles. By adjusting the core-shell monomer ratio, the modifier's refractive index is equal to or similar to that of the base resin PVC, ensuring high light transmittance and low haze. This method addresses the poor weather resistance of existing MBS-toughened transparent PVC products, meeting the requirements for PVC in the transparent product market. Acrylate modifiers in this technology are sensitive to processing temperature, requiring precise control of processing conditions to avoid degradation of material properties. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a polycarbonate type impact resistant agent with better compatibility with the processing temperature of PVC and a preparation method thereof.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a polycarbonate type impact resisting agent, characterized in that it has the following structure: A n—C, wherein A is a polycarbonate chain, n is 2 to 4, and C is a multi-head initiator residue; the polycarbonate chain is a block structure of a soft segment and a rigid segment, one end of the soft segment is connected to the multi-head initiator residue, and the other end of the soft segment is connected to the rigid segment, the soft segment is a polycarbonate segment of butyl glycidyl ether (BGE) and CO2, a polycarbonate segment of C12-14 alkyl glycidyl ether (AGE) and CO2, and one or more of PEO and PPO, and the rigid segment is a PE segment polymerized by an epoxy compound and phthalic anhydride or / and a polycarbonate segment of cyclohexene oxide and CO2.

[0007] The invention is an impact-resistant agent for polymer elastomers, which has a star-shaped structure, wherein the flexible segments are centrally connected to the multi-head initiator residues and the outer side is a rigid segment. The invention will not precipitate after being mixed with PVC, and the processing temperature is adapted to PVC. After being blended with PVC, the invention can meet the requirements of toughening and impact resistance.

[0008] Preferably, the polycarbonate chain in the aforementioned polycarbonate impact resistant agent has a number average molecular weight of 2500-15W. This preferred molecular weight can meet the toughening and impact resistance requirements of most PVC applications. More preferably, the polycarbonate chain has a number average molecular weight of 5W-12W, which is suitable for PVC applications with higher impact resistance requirements.

[0009] Preferably, in the above-mentioned polycarbonate-type impact resistant agent, the structural formula of the polycarbonate chain is:

[0010] ,

[0011] wherein a, b, c, and d are all integers, and 1≤a+b≤90, 1≤c+d+e≤85; R1 is hydrogen or methyl, R2 is butyl, C12 alkyl, or C14 alkyl, and R3 is hydrogen or C1~C14 alkyl.

[0012] Preferably, the ratio of a+b to c+d+e in the above structural formula is 1:1.2-1.5. When the ratio of the outer rigid segment is adjusted to be slightly higher than that of the inner flexible segment, the impact-resistant agent exhibits better impact resistance.

[0013] Specifically, in the above-mentioned polycarbonate-type impact resisting agent, the general formula of C is R(-L)n, and R(-L)n is an n-valent anionic group derived from (A) a nitrogen-free aliphatic organic polycarboxylic acid, (B) a polyphenol, (C) polyacrylic acid, an acrylic acid-methacrylic acid copolymer or polymaleic acid, (D) a hydroxyaromatic carboxylic acid, or (E) a nitrogen-containing aliphatic organic polycarboxylic acid.

[0014] Preferably, the C is:

[0015] 、

[0016] 、

[0017] 、

[0018] 、

[0019] 、

[0020] 、

[0021] and

[0022] The preferred initiator residues have good flexibility and are suitable as the copolymerization core of the impact resistant agent.

[0023] A preparation process A of the above-mentioned polycarbonate type impact resistant agent is as follows:

[0024] 1) placing an epoxy compound, a catalyst, and a multi-head initiator into a high-pressure reactor, wherein the epoxy compound is propylene oxide and / or ethylene oxide, and conducting a polymerization reaction at a reaction temperature of 55°C to 75°C for 5 to 15 hours;

[0025] 2) After the reaction is completed, the temperature is lowered to 40°C to 50°C, cyclohexene oxide is added, and carbon dioxide is introduced until the pressure reaches 2.5MPa to 4.0MPa. The polymerization reaction is carried out for 5 to 10 hours, and then post-processing is performed to obtain the product.

[0026] Another preparation process B of the above-mentioned polycarbonate type impact resistant agent is as follows:

[0027] 1) placing an epoxy compound, a catalyst, and a multi-head initiator into a high-pressure reactor, wherein the epoxy compound is BGE and / or AGE, introducing carbon dioxide until the pressure reaches 2.5 MPa to 4.0 MPa, and conducting a polymerization reaction at 40°C to 50°C for 5 to 10 hours;

[0028] 2) After the reaction is completed, the gas in the kettle is replaced with nitrogen, and then an epoxy compound and phthalic anhydride are added to the kettle. The epoxy compound is propylene oxide and / or ethylene oxide. The reaction temperature is increased to 55°C to 75°C and the polymerization reaction is carried out for 5 to 15 hours.

[0029] The present invention provides two copolymerization processes, which can prepare polycarbonate-type impact resistant agents meeting the above structure with high yield. Other molecular structures require targeted process adjustments.

[0030] In the above-mentioned preparation processes A and B, the catalyst can be a metal catalyst or an organic boron compound, and the metal catalyst includes a zinc catalyst system, a metal porphyrin catalyst system, a β-diimine metal complex catalyst, a double metal cyanide complex catalyst, a SalenMX catalyst system, a rare earth catalyst system, and a multi-metal catalyst system.

[0031] In Preparation Process A, the catalyst is triethylboron, tripropylboron, or tributylboron. In Preparation Process A, only a short alkyl organoboron group needs to be selected to be combined with a multi-head initiator to achieve high-yield copolymerization and obtain the target product with good performance as an impact-resistant agent.

[0032] In Preparation Process B, the catalyst is a composite catalyst of triethylboron and diphenylboric acid in a molar ratio of 2.3 to 3.6:1. In Preparation Process B, long-chain BGE and / or AGE are copolymerized with CO2 to produce polycarbonate segments. Simultaneously, the copolymerization of phthalic anhydride and epoxy compounds is catalyzed. This requires a specific catalyst ratio to ensure the production of the target product. The optimal catalyst ratio enables high-yield copolymerization to produce a copolymer with the desired structure, which exhibits excellent performance as an impact resistant agent.

[0033] In the above preparation process, a polyfunctional onium salt initiator (or multi-arm macroinitiator) having the following general formula (I) is provided, which is not completely onium salted (i.e., not completely salted, not completely neutralized or partially neutralized, and contains H+):

[0034]

R(-L)n

(MR′x)bHc

[0035] n=b+c;

[0036] In the formula, R(-L)n is an n-valent anionic group derived from (A) a nitrogen-free aliphatic organic polycarboxylic acid, (B) a polyphenol, (C) polyacrylic acid, acrylic acid-methacrylic acid copolymer, or polymaleic acid, or (D) a nitrogen-containing aliphatic organic polycarboxylic acid; -L is -COO- (carboxylate) or -O- (oxylate); MR'x is a cationic group such as ammonium ion (quaternary ammonium cation), sulfonium ion (quaternary stearium cation), or phosphonium ion (quaternary phosphonium cation); and H is a hydrogen ion (H+). R' is a C1-C30 hydrocarbon group, preferably a C2-C20 hydrocarbon group, more preferably a C2-C10 hydrocarbon group, and even more preferably a C2-C5 hydrocarbon group, such as ethyl, propyl, or butyl.

[0037] x is 3 or 4. When MR'x is an ammonium ion (quaternary ammonium cation) or a phosphonium ion (quaternary phosphonium cation), x is 4, and when MR'x is a sulfonium ion (quaternary stearium cation), x is 3. M is N (nitrogen), P (phosphorus), or S (sulfur).

[0038] n is the total number of carboxylic acid and / or phenolic hydroxyl groups in the polycarboxylic acids or polyphenols (i.e., R(-L)nHn) described above (A) to (E). n is generally an integer from 2 to 30, preferably from 3 to 29, and more preferably from 4 to 28, for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, or 27.

[0039] b is an integer from 1 to 29, preferably from 2 to 28, more preferably from 3 to 27, for example, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, or 26. c is an integer greater than or equal to 1 (i.e., the compound of Formula I contains at least one COOH group or phenolic OH group), more preferably c is 1 to 15, preferably 1 to 13, preferably 1 to 10, preferably 1 to 6, and more preferably 1, 2, or 3.

[0040] Preferably, the nitrogen-free aliphatic polycarboxylic acid (A) is (or is selected from): (A1) (hydroxyl-free or hydroxyl-containing) C6-C30 (preferably C8-C20, more preferably C10-C16) aliphatic organic polycarboxylic acid (such as 1,4-butanedicarboxylic acid, pentane-1,3,5-tricarboxylic acid, citric acid, malic acid, o-, m-, p-terephthalic acid, benzene trimecartonic acid, pyromellitic acid, naphthalene dicarboxylic acid, naphthalene tricarboxylic acid, naphthalene tetracarboxylic acid, naphthalene pentacarboxylic acid, naphthalene hexacarboxylic acid).

[0041] The polyphenol (B) is (or is selected from) a C6-C30 (preferably C6-C20) polyphenol. Preferably, the polyphenol (C) is (or is selected from): o-, m-, and p-quinone, naphthalene-tetraphenol, bisphenol A, bisphenol F, and bisphenol S.

[0042] Preferably, the polyacrylic acid, acrylic acid-methacrylic acid copolymer or polymaleic acid (C) is a polyacrylic acid, acrylic acid-methacrylic acid copolymer or polymaleic acid having a number average molecular weight of 220 to 2000 (preferably 290 to 1500, more preferably 350 to 1000 or 500 to 900, such as 216, 258, 348, 600, 700 or 800).

[0043] Preferably, the nitrogen-containing aliphatic or aromatic organic polycarboxylic acid (D) is (or is selected from): (D1) C2-C30 (preferably C3-C28, more preferably C4-C24) alkylenediaminetetra(C2-C6)carboxylic acid, or nitrilotri(C2-C6)carboxylic acid; for example, ethylenediaminetetraacetic acid, ethylenediaminetetrapropionic acid, ethylenediaminetetrabutyric acid, ethylenediaminetetrapentanoic acid, ethylenediaminetetrahexanoic acid, propylenediaminetetraacetic acid, propylenediaminetetrapropionic acid, propylenediaminetetrabutyric acid, propylenediaminetetrapentanoic acid, propylenediaminetetrahexanoic acid, butylene diamine tetraacetic acid, butanediaminetetrapropionic acid, butanediaminetetrabutyric acid, butanediaminetetrapentanoic acid, butanediaminetetrahexanoic acid, nitrilotriacetic acid, nitrilotripropionic acid, nitrilotributyric acid, nitrilotripvaleric acid, or nitrilotrihexanoic acid; or, (D2) N-C1-C4 alkyl-piperidinedicarboxylic acid (such as N-methyl-piperidine-3,5-dicarboxylic acid), N-C1-C4 alkyl-piperidinetricarboxylic acid (such as N-ethyl-piperidinetricarboxylic acid), or N-C1-C4 alkyl-piperidinetetracarboxylic acid (such as N-ethyl-piperidinetetracarboxylic acid).

[0044] Preferably, R is an aliphatic hydrocarbon group or a nitrogen-containing aliphatic hydrocarbon group.

[0045] According to a second embodiment of the present invention, there is provided a fully onium salted (i.e., fully salified, fully neutralized, and free of H+) multifunctional onium salt initiator (or multi-arm macroinitiator) having the following general formula (II):

[0046]

R(-L)n

(MR′x)n

[0047] Here, MR'x is a cationic group such as a sulfonium ion (quaternary phosphonium cation) or a phosphonium ion (quaternary phosphonium cation).

[0048] wherein R(-L)n, R, -L, M, R', n and x are as defined above.

[0049] The inventors of the present application have discovered that, despite being completely onium salted, the initiator of the general formula II containing a sulfonium ion (quaternary ephedrine cation) or a phosphonium ion (quaternary phosphonium cation) still has a high reactivity.

[0050] According to a third embodiment of the present invention, there is provided a fully onium salted (i.e., fully salified, fully neutralized, and free of H+) multifunctional onium salt initiator (or multi-arm macroinitiator) having the following general formula (III):

[0051]

R(-L)n

(MR′x)n

[0052] wherein R(-L)n is an n-valent anionic group derived from the nitrogen-containing aliphatic organic polycarboxylic acid (E) above;

[0053] wherein R, -L, M, R', n and x are as defined above.

[0054] Here, MR'x is a cationic group such as ammonium ion (quaternary ammonium cation), sulfonium ion (quaternary stearium cation) or phosphonium ion (quaternary phosphonium cation).

[0055] Since the compound of general formula III contains N and is a Lewis base itself, it has higher activity. Therefore, even if it is completely converted into an onium salt, it still has high reactivity.

[0056] Compared with the prior art, the carbon dioxide-based surfactant polymer monomer and its preparation method of the present invention have the following beneficial effects: the impact resistant agent of the present invention is a star-shaped elastomer with flexible segments centrally connected to the multi-head initiator residues and rigid segments on the outside, which gives the elastomer structure excellent toughness. Moreover, the impact resistant agent is a polymer material and will not precipitate after mixing with PVC, maintaining the performance of the product for a long time without any toxicity. The present invention uses carbon dioxide, an epoxy compound, and a cyclic acid anhydride as monomers for copolymerization. The copolymer is an anionic polymer with a controllable structure and a processing temperature compatible with PVC. After blending with PVC, it can meet the toughening and impact resistance requirements. With carbon dioxide as one of the main monomers, the cost is low and carbon reduction and environmental protection are achieved. DETAILED DESCRIPTION

[0057] The technical solutions of the present invention are illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0058] Example A-1

[0059] 1) Propylene oxide, triethyl boron and The mixture was added into a high-pressure reactor in a molar ratio of 100:0.01:0.08, and the polymerization reaction was carried out at a reaction temperature of 65°C for 10 hours;

[0060] 2) After the reaction is completed, the temperature is lowered to 45°C, cyclohexane is added, and carbon dioxide is introduced until the pressure reaches 3.5 MPa. The molar ratio of cyclohexane to propylene oxide from step 1) is 135:100. The polymerization reaction is carried out for 7 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a copolymer. Nuclear magnetic resonance (NMR) analysis shows a number average molecular weight of 30W, of which the molar percentage of the PPO flexible segment is 42.6%, and the molar percentage of the polycarbonate rigid segment of cyclohexane and CO2 is 57.4%.

[0061] Example A-2

[0062] 1) Ethylene oxide, tripropyl boron and The mixture was added into a high-pressure reactor in a molar ratio of 100:0.01:0.069, and the polymerization reaction was carried out at a reaction temperature of 55° C. for 15 hours;

[0063] 2) After the reaction is completed, the temperature is lowered to 40°C, cyclohexane is added, and carbon dioxide is introduced until the pressure reaches 4.0 MPa. The molar ratio of cyclohexane to ethylene oxide from step 1) is 150:100. The polymerization reaction is carried out for 10 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a copolymer. Nuclear magnetic resonance (NMR) analysis shows a number average molecular weight of 36W, of which the molar percentage of the PEO flexible segment is 40%, and the molar percentage of the polycarbonate rigid segment of cyclohexane and CO2 is 60%.

[0064] Example A-3

[0065] 1) Propylene oxide, tributyl boron and The epoxy compound is propylene oxide and / or ethylene oxide, which are added into a high-pressure reactor in a molar ratio of 100:0.01:0.11, and the polymerization reaction is carried out at a reaction temperature of 75° C. for 5 hours;

[0066] 2) After the reaction is complete, the temperature is lowered to 50°C, cyclohexane is added, and carbon dioxide is introduced until the pressure reaches 2.5 MPa. The molar ratio of cyclohexane to propylene oxide is 120:100. The polymerization reaction is carried out for 5 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a latex. Nuclear magnetic resonance (NMR) analysis shows that the number average molecular weight of the resulting copolymer is 20W, of which the molar percentage of the PPO flexible segment is 45.5%, and the molar percentage of the polycarbonate rigid segment of cyclohexane and CO2 is 54.5%.

[0067] Example A-4

[0068] 1) Propylene oxide, triethyl boron and The mixture was added into a high-pressure reactor in a molar ratio of 100:0.01:0.13, and the polymerization reaction was carried out at a reaction temperature of 65°C for 10 hours;

[0069] 2) After the reaction is completed, the temperature is lowered to 45°C, cyclohexane is added, and carbon dioxide is introduced until the pressure reaches 3.5 MPa. The molar ratio of cyclohexane to propylene oxide from step 1) is 233:100. The polymerization reaction is carried out for 7 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a copolymer. Nuclear magnetic resonance (NMR) analysis shows a number average molecular weight of 30W, wherein the molar percentage of the PPO flexible segment is 30%, and the molar percentage of the polycarbonate rigid segment of cyclohexane and CO2 is 70%.

[0070] Example B-1

[0071] 1) AGE, catalyst and The mixture of triethylboron and diphenylboric acid in a molar ratio of 100:0.01:0.164 was added into a high-pressure reactor; the catalyst was a composite catalyst of triethylboron and diphenylboric acid in a molar ratio of 3.0:1; carbon dioxide was introduced until the pressure reached 3.5 MPa, and the polymerization reaction was carried out at 45°C for 8 hours;

[0072] 2) After the reaction is complete, the atmosphere in the autoclave is replaced with nitrogen, and then propylene oxide and phthalic anhydride are added to the autoclave. The reaction temperature in step 1) is raised to 65°C, and the polymerization reaction is carried out for 10 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a latex. Nuclear magnetic resonance (NMR) analysis shows that the number average molecular weight of the resulting copolymer is 30W. The mole percentage of the polycarbonate flexible segment formed by the AGE and CO2 is 43.4%, and the mole percentage of the PE rigid segment formed by the polymerization of propylene oxide and phthalic anhydride is 56.6%.

[0073] Example B-2

[0074] 1) AGE, catalyst and The catalyst is triethylboron and diphenylboric acid in a molar ratio of 2.3:1 and added to a high-pressure reactor in a molar ratio of 100:0.01:4.5; carbon dioxide is introduced until the pressure reaches 2.5 MPa, and the polymerization reaction is carried out at 50°C for 10 hours;

[0075] 2) After the reaction is complete, the atmosphere in the autoclave is replaced with nitrogen, and then ethylene oxide and phthalic anhydride are added to the autoclave. The reaction temperature is raised to 55°C and the polymerization reaction is carried out for 15 hours at a molar ratio of 100:120:120. Upon completion of the reaction, the reaction is terminated to obtain a latex. The latex is then washed and devolatilized to obtain a copolymer. Nuclear magnetic resonance (NMR) analysis reveals a number-average molecular weight of 1W, wherein the molar percentage of the polycarbonate flexible segment formed by the AGE and CO2 copolymer is 45.5%, and the molar percentage of the PE rigid segment formed by the polymerization of ethylene oxide and phthalic anhydride is 54.5%.

[0076] Example B-3

[0077] 1) Combine BGE, catalyst and The catalysts triethylboron and diphenylboric acid in a molar ratio of 3.6:1 were added to a high-pressure reactor in a molar ratio of 100:0.01:0.12; carbon dioxide was introduced until the pressure reached 4.0 MPa, and the polymerization reaction was carried out at 40°C for 5 hours;

[0078] 2) After the reaction is complete, the atmosphere in the autoclave is replaced with nitrogen, and then propylene oxide and phthalic anhydride are added to the autoclave. In step 1), the molar ratio of BGE to propylene oxide and phthalic anhydride is 100:150:150. The reaction temperature is raised to 75°C and the polymerization reaction is carried out for 5 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a latex. Nuclear magnetic resonance (NMR) analysis shows that the number average molecular weight of the resulting copolymer is 45W. The mole percentage of the polycarbonate flexible segment formed by the BGE and CO2 polymerization is 40%, and the mole percentage of the PE rigid segment formed by the polymerization of propylene oxide and phthalic anhydride is 60%.

[0079] Example B-4

[0080] 1) AGE, catalyst and The mixture was added into a high-pressure reactor in a molar ratio of 100:0.01:0.164, and a catalyst was a composite catalyst of triethylboron and diphenylboric acid in a molar ratio of 1:2; carbon dioxide was introduced until the pressure reached 3.5 MPa, and the polymerization reaction was carried out at 45°C for 8 hours;

[0081] 2) After the reaction is complete, the atmosphere in the autoclave is replaced with nitrogen, and then propylene oxide and phthalic anhydride are added to the autoclave. The reaction temperature in step 1) is raised to 65°C, and the polymerization reaction is carried out for 10 hours. After the reaction is complete, the reaction is terminated to obtain a latex. The latex is washed and devolatilized to obtain a latex. Nuclear magnetic resonance (NMR) analysis reveals a number-average molecular weight of 27W for the resulting copolymer. The molar percentage of the polycarbonate flexible segment formed by the AGE and CO2 is 41.8%, and the molar percentage of the PE rigid segment formed by the polymerization of propylene oxide and phthalic anhydride is 58.2%.

[0082] The impact resistant agents prepared in each example were added to SG3 type PVC for blending at an addition amount of 5 wt %. The impact resistance of the blended materials was tested. The test results are shown in Table 1.

[0083] Table 1

[0084] .

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A polycarbonate type impact resistant agent, characterized in that: Has the following structure: A n —C, wherein A is a polycarbonate chain, n is 3 to 4, and C is a multi-head initiator residue; the polycarbonate chain is a block structure of a soft segment and a rigid segment, one end of the soft segment is connected to the multi-head initiator residue, and the other end of the soft segment is connected to the rigid segment, the soft segment is a polycarbonate segment of BGE and CO2 or a polycarbonate segment of AGE and CO2, and the rigid segment is a PE segment polymerized by an epoxy compound and phthalic anhydride or a polycarbonate segment of cyclohexene oxide and CO2; The C is: 、 、 、 、 ； The preparation process is: 1) placing an epoxy compound 1, a catalyst, and a multi-head initiator into an autoclave, wherein the epoxy compound 1 is BGE and / or AGE, introducing carbon dioxide until the pressure reaches 2.5 MPa to 4.0 MPa, and conducting a polymerization reaction at 40°C to 50°C for 5 to 10 hours; 2) After the reaction is completed, the gas in the kettle is replaced with nitrogen, and then the epoxy compound 2 and phthalic anhydride are added to the kettle. The epoxy compound 2 is propylene oxide and / or ethylene oxide. The reaction temperature is increased to 55°C to 75°C and the polymerization reaction is carried out for 5 to 15 hours; The catalyst is triethyl boron and diphenylboric acid in a molar ratio of 2.3-3.6:

1.

2. A polycarbonate-type impact resistant agent according to claim 1, characterized in that: The number average molecular weight of the polycarbonate chain is 2500-15W.

3. A method for preparing the polycarbonate-type impact resistant agent according to claim 1 or 2, characterized in that: The preparation process is: 1) placing an epoxy compound 1, a catalyst, and a multi-head initiator into an autoclave, wherein the epoxy compound 1 is BGE and / or AGE, introducing carbon dioxide until the pressure reaches 2.5 MPa to 4.0 MPa, and conducting a polymerization reaction at 40°C to 50°C for 5 to 10 hours; 2) After the reaction is completed, the gas in the kettle is replaced with nitrogen, and then the epoxy compound 2 and phthalic anhydride are added to the kettle. The epoxy compound 2 is propylene oxide and / or ethylene oxide. The reaction temperature is increased to 55°C to 75°C and the polymerization reaction is carried out for 5 to 15 hours; The catalyst is triethyl boron and diphenylboric acid in a molar ratio of 2.3-3.6:1.

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