A kind of impact-resistant polystyrene and preparation method thereof

Abstract

The invention relates to the technical field of polymer materials, and proposes an impact-resistant polystyrene and a preparation method thereof. An impact-resistant polystyrene comprises the following component raw materials in parts by weight: 70-80 parts of polystyrene, 10-15 parts of styrene-butadiene rubber, 10-20 parts of wood fiber, 1-2 parts of antioxidant, 2-3 parts of lubricant, and 0.5-1 part of vulcanizer; the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber, and the first styrene-butadiene rubber and the second styrene-butadiene rubber have different styrene mass contents. Through the above technical solution, the problem of poor impact resistance of polystyrene in the related art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to impact-resistant polystyrene and a preparation method thereof. Background Art

[0002] Polystyrene is a thermoplastic formed by the polymerization of styrene monomers. Its molecular chain is mainly composed of benzene rings and vinyl groups, and its chemical structure is relatively regular. Due to its good rigidity, transparency and easy processing, it is widely used in packaging, construction, electronics and other fields. From the delicate shell of food packaging to the insulation board of the building exterior wall, to the precise insulation components of electronic equipment, polystyrene can be seen everywhere, providing solid support for the efficient operation of modern life and industrial production.

[0003] However, as various industries have increasingly stringent requirements for material performance, the shortcomings of polystyrene have become increasingly prominent. Its most prominent defect is that polystyrene is a hard and brittle material. When subjected to external impact, its molecular chain cannot effectively absorb energy by deformation, and cracks are easily generated and expand rapidly, causing the material to break. This greatly limits its application in some occasions that need to withstand large impact forces. Therefore, it is very necessary to develop an impact-resistant polystyrene. Summary of the invention

[0004] The invention provides an impact-resistant polystyrene and a preparation method thereof, which solves the problem of poor impact resistance of polystyrene in the related art.

[0005] The technical solution of the present invention is as follows: The present invention proposes an impact-resistant polystyrene, comprising the following component raw materials in parts by weight: 70-80 parts of polystyrene, 10-15 parts of styrene-butadiene rubber, 10-20 parts of wood fiber, 1-2 parts of antioxidant, 2-3 parts of lubricant, and 0.5-1 part of vulcanizer; the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber, and the first styrene-butadiene rubber and the second styrene-butadiene rubber have different styrene mass contents.

[0006] As a further technical solution, the styrene content of the first styrene butadiene rubber is 24.5wt%, the styrene content of the second styrene butadiene rubber is 46.5wt%, and the mass ratio of the first styrene butadiene rubber to the second styrene butadiene rubber is 1:3-4.

[0007] As a further technical solution, the wood fiber is aminophenoxybenzene compound composite wood fiber.

[0008] In the present invention, the wood fiber itself has a certain flexibility and fibrous structure. When subjected to external force impact, the wood fiber can absorb and disperse energy to prevent the rapid expansion of cracks. The aminophenoxybenzene compound is used to compound the wood fiber to enhance the compatibility of the wood fiber and the polystyrene matrix, effectively avoiding stress concentration points caused by agglomeration, and further enhancing the tensile properties of polystyrene.

[0009] As a further technical solution, the raw materials of the aminophenoxybenzene compound composite wood fiber include aminophenoxybenzene compound and wood fiber in a mass ratio of 1 to 2:10.

[0010] As a further technical solution, the aminophenoxybenzene compound includes one or two of 3-(3-aminophenoxy)aniline and 1,3-di(4-aminophenoxy)benzene.

[0011] As a further technical solution, the preparation method of the aminophenoxybenzene compound composite wood fiber comprises the following steps: dispersing the aminophenoxybenzene compound in a solvent, adding wood fiber, mixing, filtering and drying to obtain the aminophenoxybenzene compound composite wood fiber.

[0012] As a further technical solution, the solvent is anhydrous ethanol, and the mass ratio of the solvent to the wood fiber is 10:1.

[0013] As a further technical solution, the mixing time is 2 hours.

[0014] As a further technical solution, the antioxidant includes one or more of antioxidant 264, antioxidant 626, and antioxidant 168.

[0015] In the present invention, an antioxidant is added to interrupt the oxidation reaction of polystyrene during the processing, prevent the breakage and degradation of the polystyrene molecular chain, and extend the service life of the material.

[0016] As a further technical solution, the lubricant includes one or both of calcium stearate and zinc stearate.

[0017] In the present invention, the lubricant can reduce the friction between the components and between the material and the processing equipment, which helps to make the surface of the formed polystyrene product smoother and improve the product quality.

[0018] As a further technical solution, the vulcanizing agent includes one or both of benzoyl peroxide and tert-butyl perbenzoate.

[0019] In the present invention, a vulcanizing agent is added to promote cross-linking between rubber molecular chains and improve the physical properties of the material.

[0020] The present invention also provides a method for preparing impact-resistant polystyrene, comprising the following steps: mixing the polystyrene, styrene-butadiene rubber, wood fiber, antioxidant and lubricant in parts by weight, adding a vulcanizing agent for mixing, melt-extruding and vulcanizing to obtain the impact-resistant polystyrene.

[0021] The working principle and beneficial effects of the present invention are:

[0022] In the present invention, polystyrene is used as a raw material, and styrene-butadiene rubber is added. The styrene-butadiene rubber is an elastomer with good flexibility and elasticity. When the styrene-butadiene rubber is mixed with polystyrene, the styrene-butadiene rubber can absorb and disperse energy through its own elastic deformation when the material is impacted by an external force. In the present invention, styrene-butadiene rubbers with different styrene mass contents are added at the same time to prepare impact-resistant polystyrene. By exerting the synergistic effect of the two styrene-butadiene rubbers, the flexibility and ductility of the polystyrene are enhanced. When the polystyrene is impacted by an external force, the energy can be effectively buffered to avoid instantaneous fracture of the material, thereby greatly improving the impact resistance of the polystyrene. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the following examples and comparative examples:

[0025] The polystyrene is high-impact polystyrene: model PH-888G, manufacturer is Zhenjiang Chimei Chemical Co., Ltd.;

[0026] First, styrene-butadiene rubber: styrene content is 24.5wt%, model is SBR 1763, manufacturer is Kumho Petrochemical Co., Ltd. of South Korea;

[0027] Second styrene butadiene rubber: styrene content is 46.5wt%, model is SBR 1745T, manufacturer is Kumho Petrochemical Co., Ltd. of South Korea;

[0028] Wood fiber: length is 40 μm, the manufacturer is Guangzhou Yinhuan Chemical Co., Ltd.

[0029] Example 1

[0030] A method for preparing high-impact polystyrene comprises the following steps: kneading 70 parts of polystyrene, 10 parts of styrene-butadiene rubber, 10 parts of wood fiber, 1 part of antioxidant 264, and 2 parts of calcium stearate, adding 0.5 parts of benzoyl peroxide, kneading, melt extruding, and vulcanizing to obtain high-impact polystyrene, wherein the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber in a mass ratio of 1:2.

[0031] Example 2

[0032] A method for preparing high-impact polystyrene comprises the following steps: kneading 75 parts of polystyrene, 12 parts of styrene-butadiene rubber, 15 parts of wood fiber, 1.5 parts of antioxidant 626, and 2.5 parts of calcium stearate, adding 0.8 parts of benzoyl peroxide, kneading, melt extruding, and vulcanizing to obtain high-impact polystyrene, wherein the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber in a mass ratio of 1:2.

[0033] Example 3

[0034] A method for preparing impact-resistant polystyrene comprises the following steps: mixing 80 parts of polystyrene, 15 parts of styrene-butadiene rubber, 20 parts of wood fiber, 2 parts of antioxidant 168, and 3 parts of zinc stearate, adding 1 part of tert-butyl peroxybenzoate, mixing, melt-extruding, and vulcanizing to obtain the impact-resistant polystyrene, wherein the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber in a mass ratio of 1:2.

[0035] Example 4

[0036] Compared with Example 1, the difference of Example 4 is that the styrene-butadiene rubber is composed of the first styrene-butadiene rubber and the second styrene-butadiene rubber in a mass ratio of 1:3.

[0037] Example 5

[0038] Compared with Example 1, the difference of Example 5 is that the styrene-butadiene rubber is composed of the first styrene-butadiene rubber and the second styrene-butadiene rubber in a mass ratio of 1:4.

[0039] Example 6

[0040] Compared with Example 1, the difference of Example 6 is that the styrene-butadiene rubber consists of a first styrene-butadiene rubber and a second styrene-butadiene rubber in a mass ratio of 1:5.

[0041] Example 7

[0042] The preparation method of aminophenoxybenzene compound composite wood fiber comprises the following steps: dispersing 1 part of 3-(3-aminophenoxy)aniline in 100 parts of anhydrous ethanol, adding 10 parts of wood fiber, mixing for 2 hours, filtering and drying to obtain aminophenoxybenzene compound composite wood fiber;

[0043] Compared with Example 5, Example 7 is different in that the wood fiber is replaced with an equal amount of aminophenoxybenzene compound composite wood fiber obtained by the above preparation method.

[0044] Example 8

[0045] Compared with Example 7, the difference in Example 8 is that the amount of 3-(3-aminophenoxy)aniline added is 2 parts.

[0046] Example 9

[0047] Compared with Example 8, Example 9 is different in that 3-(3-aminophenoxy)aniline is replaced by an equal amount of 1,3-di(4-aminophenoxy)benzene.

[0048] Comparative Example 1

[0049] Compared with Example 1, the difference of Comparative Example 1 is that the styrene-butadiene rubber is the first styrene-butadiene rubber.

[0050] Comparative Example 2

[0051] Compared with Example 1, the difference in Comparative Example 2 is that the styrene-butadiene rubber is the second styrene-butadiene rubber.

[0052] The polystyrenes obtained in Examples 1 to 6 and Comparative Examples 1 to 2 were tested according to the following method:

[0053] Room temperature impact resistance: According to the test method specified in GB / T 1043.2-2018 "Determination of impact properties of simply supported beams of plastics Part 2: Instrumented impact test", the simply supported beam impact strength of the notched specimen is tested. The specimen type is 1, the notch type is type A, the impact direction is lateral, and the temperature is 25°C.

[0054] The test results are shown in Table 1:

[0055] Table 1 Performance test results of polystyrene obtained in Examples 1 to 6 and Comparative Examples 1 to 2

[0056]

[0057] Compared with Comparative Examples 1 and 2, Example 1 adds the first styrene butadiene rubber and the second styrene butadiene rubber at the same time. As a result, the notched specimen simply supported beam impact strength of Example 1 is greater than that of Comparative Examples 1 and 2, indicating that the first styrene butadiene rubber and the second styrene butadiene rubber can be used together to improve the impact resistance of polystyrene.

[0058] Tensile properties: Polystyrene is made into Type 1A specimens in GB / T 1040.2-2022 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics". The tensile strength of the sample is tested according to the test method specified in GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General principles". The test speed is 50 mm / min.

[0059] The test results are shown in Table 2:

[0060] Table 2 Performance test results of polystyrene obtained in Example 5 and Examples 7 to 9

[0061]

[0062] Compared with Example 5, Examples 7 to 9 added aminophenoxybenzene compounds to composite wood fibers. As a result, the tensile strengths of Examples 7 to 9 were greater than those of Example 5, indicating that the tensile properties of polystyrene can be improved when aminophenoxybenzene compounds are added to composite wood fibers.

[0063] The polystyrene prepared in Example 1 was tested according to the following method:

[0064] Low temperature impact resistance: According to the test method specified in GB / T 1043.2-2018 "Determination of impact properties of simply supported beams of plastics Part 2: Instrumented impact test", the simply supported beam impact strength of the notched specimen is tested. The specimen type is 1, the notch type is type A, the impact direction is lateral, and the temperature is -40°C.

[0065] Flexural modulus: According to the test method specified in GB / T 9341-2008 “Determination of flexural properties of plastics”, the flexural modulus of the test sample is tested. The sample size is 80mm×10mm×4mm and the test speed is 2mm / min.

[0066] The test results are shown in Table 3:

[0067] Table 3 Performance test results of polystyrene obtained in Example 1

[0068]

[0069] The simply supported beam impact strength of the polystyrene prepared in Example 1 at -40°C can reach 14.5 kJ / m 2 , the flexural modulus is 1670MPa, and it has good performance effect in low temperature environment.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An impact-resistant polystyrene, characterized in that: The invention comprises the following raw materials in parts by weight: 70-80 parts of polystyrene, 10-15 parts of styrene-butadiene rubber, 10-20 parts of wood fiber, 1-2 parts of antioxidant, 2-3 parts of lubricant, and 0.5-1 part of vulcanizer; the styrene-butadiene rubber is composed of a first styrene-butadiene rubber and a second styrene-butadiene rubber, and the first styrene-butadiene rubber and the second styrene-butadiene rubber have different styrene mass contents; The styrene content of the first styrene butadiene rubber is 24.5wt%, the styrene content of the second styrene butadiene rubber is 46.5wt%, and the mass ratio of the first styrene butadiene rubber to the second styrene butadiene rubber is 1:3-4; The wood fiber is an aminophenoxybenzene compound composite wood fiber; The aminophenoxybenzene compound includes one or two of 3-(3-aminophenoxy)aniline and 1,3-di(4-aminophenoxy)benzene.

2. The high-impact polystyrene according to claim 1, characterized in that: The raw materials of the aminophenoxybenzene compound composite wood fiber include aminophenoxybenzene compound and wood fiber in a mass ratio of 1 to 2:

10.

3. The high-impact polystyrene according to claim 1, characterized in that: The preparation method of the aminophenoxybenzene compound composite wood fiber comprises the following steps: dispersing the aminophenoxybenzene compound in a solvent, adding wood fiber, mixing, filtering and drying to obtain the aminophenoxybenzene compound composite wood fiber.

4. The high-impact polystyrene according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 264 , antioxidant 626 , and antioxidant 168 .

5. The high-impact polystyrene according to claim 1, characterized in that: The lubricant includes one or both of calcium stearate and zinc stearate.

6. The high-impact polystyrene according to claim 1, characterized in that: The vulcanizing agent includes one or both of benzoyl peroxide and tert-butyl perbenzoate.

7. The method for preparing high-impact polystyrene according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: mixing the polystyrene, styrene-butadiene rubber, wood fiber, antioxidant and lubricant in parts by weight, adding a vulcanizing agent, mixing, melting and extruding, and vulcanizing to obtain impact-resistant polystyrene.

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