Mbs for abs transparency modification and its preparation method and application

Abstract

The application provides an MBS for ABS transparent modification and a preparation method and application thereof, methyl methacrylate, rubber and styrene are mixed in a certain proportion, and then polymerization is carried out in a polymerization kettle to obtain a methyl methacrylate-rubber-styrene copolymer MBS which is an ABS transparent toughening modifier. By adding the transparent toughening modifier MBS, a transparent ABS material with high light transmittance and small influence on mechanical properties can be prepared by using a blending method, and the optical properties and mechanical properties of the transparent ABS material are balanced. The product performance indicators can simultaneously satisfy the conditions that the light transmittance is greater than or equal to 87%, the haze is less than or equal to 13%, the impact strength is greater than or equal to 12kJ / m 2 .

Description

Technical Field

[0001] This invention belongs to the field of polymer preparation technology, specifically relating to an MBS for transparent modification of ABS, its preparation method and application. Background Technology

[0002] With the continuous improvement of people's living standards, both domestic and international standards are imposing stricter requirements on the practicality and aesthetics of plastic materials used in automobiles, construction, toys, home appliances, and office supplies. This has led to a year-on-year increase in the demand for transparent ABS. Therefore, researching and developing a material that can both toughen and modify the transparency of ABS is crucial for alleviating the insufficient production capacity of polymerized transparent ABS in China, and has become a problem of great concern and urgent need to be solved in the industry.

[0003] Currently, commercially available general-purpose ABS resin is opaque, while transparent ABS is a special grade resin developed based on general-purpose ABS resin. It possesses the excellent mechanical properties of general-purpose ABS resin while also exhibiting high transparency. Transparent ABS can currently be produced through polymerization and modification methods. However, in the process of modifying ABS for transparency, PMMA and ABS have poor compatibility, making it difficult to balance the optical and mechanical properties of modified transparent ABS. This makes it difficult to guarantee certain properties of transparent ABS prepared through modification methods, hindering its ability to simultaneously achieve good light transmittance and impact resistance, thus limiting its application in certain fields. Summary of the Invention

[0004] (a) Technical problems to be solved This invention proposes an MBS for transparent modification of ABS, its preparation method and application, to solve the technical problem that transparent ABS prepared by modification methods is difficult to have both good light transmittance and impact resistance.

[0005] (II) Technical Solution To address the aforementioned technical problems, this invention proposes a method for preparing MBS for transparent modification of ABS. The method involves mixing methyl methacrylate, rubber, and styrene, and then performing a polymerization reaction in a polymerization reactor to obtain methyl methacrylate-rubber-styrene copolymer MBS, which serves as a transparent toughening modifier for ABS.

[0006] Furthermore, the MBS preparation method specifically includes: dissolving rubber in a mixed solution of methyl methacrylate and styrene, then adding solvent, initiator, chain transfer agent and antioxidant, stirring continuously until uniformly mixed, then adding the mixed material to a polymerization reactor for polymerization reaction, and after the reaction is completed, devolatilizing and granulating the material to obtain transparent toughening modifier MBS.

[0007] Furthermore, the material is composed of the following raw materials in parts by weight: 40-45 parts methyl methacrylate, 8-15 parts rubber, 30-40 parts styrene, 15-20 parts solvent, 0.01-0.03 parts initiator, 0.1-0.3 parts chain transfer agent, and 0.1-0.5 parts antioxidant.

[0008] Further, the solvent is toluene or ethylbenzene; the initiator is one of azobisisobutyronitrile, diisobutyric acid peroxide, persulfate, di-tert-butyl peroxide, or 1,1-di-tert-butylperoxide cyclohexane; the chain transfer agent is n-dodecyl mercaptan or tert-dodecyl mercaptan; and the antioxidant is one or both of 1076 and 1010, wherein when two are used, the mass ratio is 1:1.

[0009] Furthermore, the stirring speed was 800 r / min, and the stirring was continued for 2 hours; the polymerization reaction was carried out in four stages, each stage lasting 1.5 hours, with reaction temperatures of 103℃, 117℃, 132℃, and 153℃ for each stage.

[0010] Furthermore, this invention also proposes an MBS for transparent modification of ABS, which is prepared using the above method.

[0011] Furthermore, the present invention also proposes a method for transparent modification of ABS, which involves co-extruding PMMA, ABS, SAN resin, the aforementioned MBS, and an antioxidant.

[0012] Furthermore, the material for co-extrusion consists of the following raw materials in parts by weight: 30-35 parts PMMA, 40-60 parts ABS, 10-15 parts SAN resin, 5-10 parts MBS, and 0.5-3 parts antioxidant; the antioxidant is one or both of 1076 and 1010, and when two are used, the mass ratio is 1:1.

[0013] Furthermore, the blending extrusion adopts a twin-screw extruder with a temperature range of 180~265℃ and a screw speed of 200~300rpm / min.

[0014] Furthermore, this invention also proposes an ABS that has been transparently modified using the above method, wherein the ABS has a light transmittance ≥87%, a haze ≤13%, and an impact strength ≥12kJ / m². 2 .

[0015] (III) Beneficial Effects This invention proposes a transparent toughening modifier for ABS, its preparation method, and its application. Methyl methacrylate, rubber, and styrene are mixed in a certain proportion and then polymerized in a polymerization reactor to obtain methyl methacrylate-rubber-styrene copolymer (MBS), which serves as a transparent toughening modifier for ABS. By adding the transparent toughening modifier MBS, transparent ABS materials with high light transmittance and minimal impact on mechanical properties can be prepared using a blending method, balancing the optical and mechanical properties of the transparent ABS material. The product performance indicators can simultaneously meet the requirements of light transmittance ≥87%, haze ≤13%, and impact strength ≥12kJ / m². 2 . Detailed Implementation

[0016] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to examples.

[0017] Example 1 This embodiment proposes a method for preparing methyl methacrylate-rubber-styrene copolymer (MBS) for transparent modification of ABS, specifically including the following steps: Eight parts of commercially available S1322 rubber were dissolved in a mixed solution of 40 parts methyl methacrylate and 30 parts styrene. Then, 15 parts of solvent ethylbenzene, 0.01 parts of initiator, 0.15 parts of chain transfer agent, and 0.2 parts of antioxidant 1076 were added. After thorough mixing, the mixture was added to a small-scale reactor. The reaction was carried out in four stages, each lasting 1.5 hours, with reaction temperatures of 103℃, 117℃, 132℃, and 153℃, respectively. The material after the reaction was devolatilized to obtain the transparent toughening modifier MBS.

[0018] Weigh 30 parts PMMA, 50 parts ABS, 13 parts SAN resin, 5 parts MBS and 2 parts antioxidant 1076, put them in a high-speed mixer and mix for 5 to 10 minutes. Extrude the mixed material using a twin-screw extruder. The temperature range of each section of the extruder is 180 to 265°C and the screw speed is 200 to 300 rpm / min. Finally, modified transparent ABS material is obtained.

[0019] Example 2 Keeping the other steps in Example 1 unchanged, the amount of transparent toughening modifier MBS added was adjusted to 10 parts, and the amount of ABS added was adjusted to 45 parts.

[0020] Comparative Example 1 Keeping the other steps in Example 1 unchanged, the amount of transparent toughening modifier MBS added was adjusted to 15 parts, and the amount of ABS added was adjusted to 40 parts.

[0021] Comparative Example 2 Keeping the other steps in Example 1 unchanged, the transparent toughening modifier is replaced with commercially available MBS-M722.

[0022] Comparative Example 3 Keeping the other steps in Example 1 unchanged, the transparent toughening modifier is replaced with commercially available MBS-M513.

[0023] The test results are shown in the table below. As can be seen from the test, the method of the present invention can balance the optical and mechanical properties of transparent ABS material.

[0024] Test Project Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Light transmittance (%) 84.92 87.51 85.07 81.14 84.39 Haze (%) 15.61 12.92 14.17 30.55 19.83 <![CDATA[Impact strength (kJ / m 2 )]]> 10.6 12.3 13.7 12.8 11.9 The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing MBS for transparent modification of ABS, characterized in that, The MBS preparation method involves mixing methyl methacrylate, rubber, and styrene, and then performing a polymerization reaction in a polymerization reactor to obtain methyl methacrylate-rubber-styrene copolymer MBS, which serves as a transparent toughening modifier for ABS.

2. The method for preparing MBS for transparent modification of ABS as described in claim 1, characterized in that, The MBS preparation method specifically includes: dissolving rubber in a mixed solution of methyl methacrylate and styrene, then adding solvent, initiator, chain transfer agent and antioxidant, stirring continuously until uniformly mixed, then adding the mixed material to a polymerization reactor for polymerization reaction, and after the reaction is completed, devolatilizing and granulating the material to obtain transparent toughening modifier MBS.

3. The method for preparing MBS for transparent modification of ABS as described in claim 2, characterized in that, The material is composed of the following raw materials in parts by weight: 40-45 parts methyl methacrylate, 8-15 parts rubber, 30-40 parts styrene, 15-20 parts solvent, 0.01-0.03 parts initiator, 0.1-0.3 parts chain transfer agent, and 0.1-0.5 parts antioxidant.

4. The method for preparing MBS for transparent modification of ABS as described in claim 2, characterized in that, The solvent is toluene or ethylbenzene; the initiator is one of azobisisobutyronitrile, diisobutyric acid peroxide, persulfate, di-tert-butyl peroxide, or 1,1-di-tert-butylperoxide cyclohexane; the chain transfer agent is n-dodecyl mercaptan or tert-dodecyl mercaptan; the antioxidant is one or both of 1076 and 1010, and when two are used, the mass ratio is 1:

1.

5. The method for preparing MBS for transparent modification of ABS as described in claim 2, characterized in that, The stirring speed was 800 r / min, and the stirring was continued for 2 hours. The polymerization reaction was carried out in four stages, each lasting 1.5 hours, with reaction temperatures of 103℃, 117℃, 132℃, and 153℃ for each stage.

6. An MBS for transparent modification of ABS, characterized in that, The MBS used for transparent modification of ABS is prepared by the method described in any one of claims 1 to 5.

7. A method for making ABS transparent, characterized in that, The method for modifying ABS to be transparent involves co-extruding PMMA, ABS, SAN resin, MBS as described in claim 6, and an antioxidant.

8. The ABS transparency modification method as described in claim 7, characterized in that, The material for co-extrusion consists of the following raw materials in parts by weight: PMMA 30-35 parts, ABS 40-60 parts, SAN resin 10-15 parts, MBS 5-10 parts, and antioxidant 0.5-3 parts; the antioxidant is one or both of 1076 and 1010, and when two are used, the mass ratio is 1:

1.

9. The ABS transparency modification method as described in claim 7, characterized in that, The blending extrusion uses a twin-screw extruder with a temperature range of 180~265℃ and a screw speed of 200~300rpm / min.

10. An ABS that has been transparently modified using the method described in any one of claims 7 to 9, characterized in that, The ABS has a light transmittance of ≥87%, a haze of ≤13%, and an impact strength of ≥12kJ / m². 2 .