Transparent compatible flexibilizer for common polystyrene and preparation method of transparent compatible flexibilizer

Abstract

The invention relates to a common polystyrene transparent compatible toughening agent and a preparation method thereof, and the common polystyrene transparent compatible toughening agent comprises the following components by mass: 20-80 parts of common polystyrene; 10-50 parts of an acrylic elastomer; 1-5 parts of a functional group reactant; 0.01 to 1 part of a catalyst; 1-5 parts of a silane coupling agent; 0.5 to 5 parts of a lubricant; 1-30 parts of a plasticizer; and 0.1-1 part of an antioxidant. The modified polystyrene has the beneficial effects that after the modified polystyrene is directly added into common polystyrene (GPPS) for production and processing, the transparency and impact resistance of the common polystyrene (GPPS) can be considered, and the obtained modified polystyrene has certain guarantee on transparency and toughness.

Description

Technical Field

[0001] The present application relates to the field of chemical technology, and in particular to a common polystyrene transparent compatible toughening agent and a preparation method thereof. Background Art

[0002] Polystyrene includes general polystyrene (GPPS), expanded polystyrene (EPS), high impact polystyrene (HIPS), etc. The present invention is aimed at transparent toughening modification of general polystyrene (GPPS) to improve the impact resistance of general polystyrene (GPPS). General polystyrene (GPPS) is a non-toxic, odorless and colorless transparent particle, a glass-like brittle material, easy to process and shape, and has the advantages of transparency, rigidity, good printability, etc., and is widely used in daily decoration, lighting and transparent packaging. However, general polystyrene (GPPS) is an amorphous non-crystalline linear high molecular polymer, the main bond is a saturated carbon chain, and the side group is a conjugated benzene ring. The random arrangement of the large-volume side groups of benzene rings determines the physical and chemical properties of polystyrene, such as high transparency, high rigidity, high glass transition temperature, brittleness, etc., especially the high brittleness greatly affects the application of general polystyrene (GPPS).

[0003] At present, the modification of ordinary polystyrene (GPPS) is mainly carried out through copolymerization, which can improve the physical and chemical properties in a certain aspect. For example, high-impact polystyrene (HIPS) is an impact-resistant polystyrene product produced by adding rubber particles to the polymerization process of polystyrene. The impact resistance is greatly improved, but the transparency is also lost; for example, styrene-acrylonitrile copolymer (SAN) is a colorless and transparent material with high mechanical strength and chemical stability, but it does not solve the problem of brittleness; for example, acrylonitrile-butadiene-styrene copolymer has the advantages of high strength and high impact resistance, but it is also opaque like high-impact polystyrene (HIPS).

[0004] Therefore, it is urgent to develop a common polystyrene transparent compatible toughening agent and a preparation method thereof, which can appropriately improve the impact resistance of common polystyrene while maintaining the transparency of common polystyrene or having little influence on it. Summary of the invention

[0005] The present invention aims to solve one of the above technical problems at least to a certain extent.

[0006] To this end, the first object of the present invention is to provide a common polystyrene transparent compatible toughening agent, which can improve the impact resistance of common polystyrene.

[0007] The second object of the present invention is to provide a method for preparing a common polystyrene transparent compatible toughening agent.

[0008] To achieve the above-mentioned purpose, the embodiment of the present application discloses a common polystyrene transparent compatible toughening agent, which comprises the following components by mass: 20-80 parts of common polystyrene; 10-50 parts of acrylic elastomer; 1-5 parts of functional group reactant; 0.01-1 parts of catalyst; 1-5 parts of silane coupling agent; 0.5-5 parts of lubricant; 1-30 parts of plasticizer; 0.1-1 parts of antioxidant; firstly, common polystyrene and acrylic functional group modifier undergo grafting reaction under the action of catalyst, so that common polystyrene is grafted with acrylic functional group, and has acrylic functional group like acrylic elastomer; secondly, silane coupling agent and plasticizer are added to acrylic elastomer to adjust the polarity and melt index of acrylic elastomer to be closer to the polarity and melt index of common polystyrene; the modification of common polystyrene and acrylic elastomer makes them meet the requirements of polymer compatibility principle as much as possible, and finally makes common polystyrene and acrylic elastomer completely compatible.

[0009] In addition, the common polystyrene transparent compatible toughening agent according to the above technical solution of the present application may also have the following additional technical features: Optionally, the acrylic elastomer is one or a mixture of ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer, and the mass accounts for 10-70% of the total mass.

[0010] Optionally, the acrylic elastomer is one or a mixture of ethylene-ethyl acrylate copolymer and ethylene-methyl acrylate copolymer, and the mass accounts for 10-50% of the total mass.

[0011] Optionally, the functional group reactant is one or a mixture of maleic anhydride, methacrylic acid, acrylic acid, glycidyl methacrylate, and the total mass is 0.5-10% of the mass of ordinary polystyrene.

[0012] Optionally, the multifunctional reactant is one or a mixture of methacrylic acid and glycidyl methacrylate, and the total mass is 1-5% of the mass of ordinary polystyrene.

[0013] Optionally, the catalyst is one or a mixture of tetrabutyl titanate, diisopropylbenzene peroxide, di(tert-butylperoxyisopropyl)benzene, di(2,4-dichlorobenzoyl) peroxide, and the total mass is 0.01-5% of the mass of ordinary polystyrene.

[0014] Optionally, the catalyst is preferably one of dicumyl peroxide and di(2,4-dichlorobenzoyl) peroxide or a mixture of both, and the total mass is 0.05-2% of the mass of ordinary polystyrene.

[0015] Optionally, the silane coupling agent is one or a mixture of vinyl triethoxysilane, vinyl tri(2-methoxyethoxy)silane, γ-aminopropyl triethoxysilane, γ-(2,3-epoxypropoxy)propyl trimethoxysilane, and γ-methacryloxypropyl trimethylsilane, and the total mass is 1-10% of the mass of the acrylic elastomer.

[0016] Optionally, the silane coupling agent is preferably one or a mixture of vinyl triethoxysilane, γ-methacryloxypropyl trimethylsilane, vinyl tri(2-methoxyethoxy) silane, and the total mass is 1-5% of the mass of the acrylic elastomer.

[0017] Optionally, the lubricant is one or a mixture of ethylene bisstearamide, erucamide, stearate, stearic acid, and the mass thereof is 1-10% of the mass of ordinary polystyrene.

[0018] Optionally, the lubricant is preferably one or a mixture of ethylene bisstearamide, stearic acid, and stearate, and the mass thereof is 1-5% of the mass of ordinary polystyrene.

[0019] Optionally, the plasticizer is one or a mixture of liquid paraffin, dioctyl terephthalate, epoxy soybean oil, and alkyl phenyl sulfonate, and the mass thereof is 1-20% of the mass of the acrylic elastomer.

[0020] Optionally, the plasticizer is preferably dioctyl terephthalate, alkyl phenyl sulfonate, or a mixture of both, and the mass of the plasticizer is 1-15% of the mass of the acrylic elastomer.

[0021] Optionally, the antioxidant is one or a mixture of phenolic antioxidant 1010, antioxidant 1076, and antioxidant 1790 as the main antioxidant, and the mass is 0.1-1% of the total mass of ordinary polystyrene and acrylic elastomer; one or a mixture of two of phosphite antioxidant TNPP and phosphite antioxidant 168 is used as the auxiliary antioxidant, and the mass is 0.1-1% of the total mass of ordinary polystyrene and acrylic elastomer.

[0022] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a method for preparing a common polystyrene transparent compatible toughening agent, comprising the following steps: Step 1: first add 100 parts of common polystyrene (GPPS), 1-5 parts of functional group reactants, and 0.01-1 parts of catalysts into a stirring mixing barrel, stir for 2-3 minutes until the mixture is evenly mixed, then successively add 0.5-5 parts of lubricants and 0.1-1 parts of antioxidants, stir for 4-5 minutes until the mixture is evenly mixed, and set aside; Step 2: add the materials evenly mixed in step 1 into a parallel twin-screw extruder, and extrude the strands after melting, shearing, dispersing, and homogenizing in the parallel twin-screw extruder, and cut the strands after cooling to obtain the first intermediate product. The temperature of the extruder is controlled at 200°C -260°C in the melting stage, 180°C -240°C in the shearing and dispersion stage, 180°C -220°C in the homogenizing stage, 180°C -260°C in the die head, 20-40rpm in the main engine speed, and the strips are cut after cooling. The product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm; Step 3: first add 100 parts of acrylic elastomer, 1-10 parts of silane coupling agent, and 1-30 parts of plasticizer into a stirring mixing barrel, stir for 2-3 minutes until the mixture is uniformly mixed, then add 0.1-1 parts of antioxidant, stir for 4-5 minutes until the mixture is uniformly mixed, and set aside; Step 4: add the materials uniformly mixed in Step 3 into a parallel twin-screw extruder, and extrude the strands after melting, shearing, dispersing, and homogenizing in the parallel twin-screw extruder, and cut the strands after cooling to obtain the second intermediate product. The temperature of the extruder in the melting stage is controlled at 140°C-180°C, the temperature in the shearing and dispersing stage is controlled at 120°C-160°C, the temperature in the homogenizing stage is controlled at 120°C-160°C, the temperature of the die head is controlled at 140°C-180°C, the main engine speed is 30-40rpm, and the strip is cut after cooling. The product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm; Step 5: 30-80 parts of the first intermediate product produced in step 2 and 10-50 parts of the second intermediate product produced in step 4 are mixed evenly according to proportion, added to the parallel twin-screw extruder, and the strips are extruded after melting, high shearing and dispersing, and homogenizing in the parallel twin-screw extruder. After the strips are cooled, they are cut to obtain the GPPS transparent compatible toughening agent. The temperature of the extruder in the melting stage is controlled at 220°C -260°C, the temperature in the shearing and dispersing stage is controlled at 200°C -240°C, the temperature in the homogenizing stage is controlled at 200°C -220°C, the temperature of the die head is controlled at 220°C -260°C, the main engine speed is 40-50rpm, and the strips are cut after cooling; the product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm.

[0023] The beneficial effect of the present application is that after being directly added to ordinary polystyrene (GPPS) for production and processing, the transparency and impact resistance properties of ordinary polystyrene (GPPS) can be taken into account, and modified polystyrene with certain transparency and toughness can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an experimental data chart of a common polystyrene transparent compatible toughening agent provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or components / elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0026] The molding method of the common polystyrene transparent compatible toughening agent according to the embodiment of the present application is described below in conjunction with the accompanying drawings.

[0027] Figure 1 FIG. 1 is a schematic diagram of the structure of a common polystyrene transparent compatible toughening agent provided by an embodiment of the present application. Figure 1 As shown: the common polystyrene transparent compatible toughening agent comprises the following components by mass: 20-80 parts of common polystyrene; 10-50 parts of acrylic elastomer; 1-5 parts of functional group reactant; 0.01-1 parts of catalyst; 1-5 parts of silane coupling agent; 0.5-5 parts of lubricant; 1-30 parts of plasticizer; 0.1-1 parts of antioxidant; firstly, common polystyrene and acrylic functional group modifier undergo grafting reaction under the action of catalyst, so that common polystyrene is grafted with acrylic functional group, and has acrylic functional group like acrylic elastomer; secondly, silane coupling agent and plasticizer are added to acrylic elastomer to adjust the polarity and melt index of acrylic elastomer to be closer to the polarity and melt index of common polystyrene; the modification of common polystyrene and acrylic elastomer makes them meet the requirements of polymer compatibility principle as much as possible, and finally makes common polystyrene and acrylic elastomer completely compatible.

[0028] Specifically, general purpose polystyrene (GPPS, also known as general-grade polystyrene) generally has a head-to-tail structure, a main chain of a saturated carbon chain, a side group of a conjugated benzene ring, a straight and rigid molecular chain, low activity, poor reactivity, and poor compatibility with other polymers. The toughened elastomer used in the present invention is an acrylic elastomer, which is difficult to be compatible with general polystyrene (GPPS), and is prone to stratification and brittleness. In order to make the two have a good compatibility, according to the compatibility principle of polymers "similar structure, similar polarity, and similar solubility", the two are modified respectively. First, general polystyrene (GPPS) and acrylic functional group modifiers undergo a grafting reaction under the action of a catalyst, so that general polystyrene (GPPS) is grafted with acrylic functional groups, and has acrylic functional groups like acrylic elastomers; secondly, silane coupling agents and plasticizers are added to acrylic elastomers to adjust the polarity and melt index of acrylic elastomers, which are closer to the polarity and melt index of general polystyrene (GPPS). The modification of ordinary polystyrene (GPPS) and acrylic elastomer makes them meet the requirements of polymer compatibility principle as much as possible, and finally makes ordinary polystyrene (GPPS) and acrylic elastomer completely compatible. Through the high shear dispersion of parallel twin-screw extruder, it is ensured that acrylic elastomer can be evenly dispersed in the continuous phase ordinary polystyrene with a dispersed phase of less than 2 microns, achieving the good effect of toughening ordinary polystyrene (GPPS) with acrylic elastomer.

[0029] It should be noted that in the GPPS transparent compatible toughening agent, ordinary polystyrene (GPPS) and acrylic functional group modifier undergo a grafting reaction under the action of a catalyst. After ordinary polystyrene (GPPS) is grafted with acrylic functional groups, it has acrylic functional groups like acrylic elastomers and can be better compatible with acrylic elastomers.

[0030] According to the common polystyrene transparent compatible toughening agent of the present application, it is added to common polystyrene through a simple blending process, has good compatibility with the common polystyrene, and appropriately improves the impact resistance of common polystyrene while maintaining the transparency of the common polystyrene or having little impact, thus becoming an effective method for ensuring the transparency and toughness of common polystyrene.

[0031] According to one embodiment of the present application, the acrylic elastomer is one or a mixture of ethylene-ethyl acrylate copolymer, ethylene-methacrylate copolymer, ethylene-butyl acrylate copolymer, and the mass accounts for 10-70% of the total mass.

[0032] According to one embodiment of the present application, the acrylic elastomer is one or a mixture of ethylene-ethyl acrylate copolymer and ethylene-methacrylate copolymer, and the mass accounts for 10-50% of the total mass.

[0033] Specifically, the acrylic elastomer itself contains certain acrylic functional groups, which are the same functional groups as GPPS having acrylic functional groups after the grafting reaction. At the same time, its molecular polarity and melt index can be adjusted under the action of silane coupling agent and plasticizer, and it has better compatibility with GPPS grafted with acrylic functional groups.

[0034] In order to facilitate the understanding of those skilled in the art, the following chemical substances are abbreviated as follows: ethylene-ethyl acrylate copolymer, English name Ethylene-ethyl acrylate, referred to as EEA; ethylene-methacrylate copolymer, referred to as EMA; ethylene-butyl acrylate copolymer, referred to as EBA.

[0035] According to one embodiment of the present application, the functional group reactant is one or a mixture of maleic anhydride, methacrylic acid, acrylic acid, and glycidyl methacrylate, and the total mass is 0.5-10% of the mass of ordinary polystyrene.

[0036] According to one embodiment of the present application, the multifunctional reactant is one or a mixture of methacrylic acid and glycidyl methacrylate, and the total mass is 1-5% of the mass of ordinary polystyrene.

[0037] Specifically, the functional group reactant contains a functional group that is a carbon-carbon double bond (C=C). Under the action of a catalyst, it can react with ordinary polystyrene (GPPS) to undergo a free radical grafting reaction, thereby combining ordinary polystyrene (GPPS) with the functional group reactant, allowing ordinary polystyrene (GPPS) to have acrylic functional groups, which can be better compatible with acrylic elastomers.

[0038] In order to facilitate the understanding of those skilled in the art, the following abbreviations of chemical substances are supplemented: Maleic anhydride, English name Maleic anhydride, abbreviated as MAH; Methacrylic acid, English name Methacrylic acid, abbreviated as MA; Acrylic acid, English name Acrylic acid, abbreviated as AA; Glycidyl methacrylate, English name Glycidyl methacrylate, abbreviated as GMA.

[0039] According to one embodiment of the present application, the catalyst is one or a mixture of tetrabutyl titanate, diisopropylbenzene peroxide, di(tert-butylperoxyisopropyl)benzene, and di(2,4-dichlorobenzoyl) peroxide, and the total mass is 0.01-5% of the mass of ordinary polystyrene.

[0040] According to one embodiment of the present application, the catalyst is preferably dicumyl peroxide, di(2,4-dichlorobenzoyl) peroxide, or a mixture of both, and the total mass is 0.05-2% of the mass of ordinary polystyrene.

[0041] Specifically, in the reaction between ordinary polystyrene (GPPS) and the carbon-carbon double bonds in the functional group reactant, peroxide, as an initiator, can initiate and catalyze the breakage of the carbon-carbon double bonds in the functional group reactant and the ordinary polystyrene (GPPS) molecular chain, thereby generating highly active free radicals, which then combine with each other to undergo a cross-linking reaction, grafting the functional group reactant onto the ordinary polystyrene (GPPS) molecular chain.

[0042] According to one embodiment of the present application, the silane coupling agent is one or a mixture of vinyl triethoxy silane, vinyl tri (2-methoxyethoxy) silane, γ-aminopropyl triethoxy silane, γ-(2,3-epoxypropoxy) propyl trimethoxy silane, and γ-methacryloxypropyl trimethyl silane, and the total mass is 1-10% of the mass of the acrylic elastomer.

[0043] According to one embodiment of the present application, the silane coupling agent is preferably one or a mixture of vinyl triethoxysilane, γ-methacryloxypropyl trimethylsilane, vinyl tri(2-methoxyethoxy) silane, and the total mass is 1-5% of the mass of the acrylic elastomer.

[0044] Specifically, the silane coupling agent itself has two different functional groups, one end of which is an organic functional group, such as the vinyl group of vinyl triethoxysilane (also known as A151) and vinyl tri (2-methoxyethoxy) silane (also known as A172), and the methacryloxypropyl group of γ-methacryloxypropyl trimethylsilane (also known as A174), which can react chemically with the acrylic elastomer molecular chain. The other end functional group is a siloxy group, which can increase the polarity of the acrylic elastomer molecular chain and more easily promote better compatibility with GPPS grafted with acrylic functional groups.

[0045] In addition, γ-aminopropyltriethoxysilane is also called KH550.

[0046] According to one embodiment of the present application, the lubricant is one or a mixture of ethylene bisstearamide, erucamide, stearate, stearic acid, and the mass is 1-10% of the mass of ordinary polystyrene.

[0047] According to one embodiment of the present application, the lubricant is preferably a mixture of one or more of ethylene bisstearamide, stearic acid, and stearate, and the mass is 1-5% of the mass of ordinary polystyrene.

[0048] Specifically, lubricants can reduce the intrinsic viscosity of GPPS in its molten state and improve the flowability of the material, which can ensure that additives such as functional group reactants and catalysts are more evenly and finely dispersed in GPPS and improve the processing performance of GPPS.

[0049] According to one embodiment of the present application, the plasticizer is one or a mixture of liquid paraffin, dioctyl terephthalate, epoxy soybean oil, and alkyl phenyl sulfonate, and the mass thereof is 1-20% of the mass of the acrylic elastomer.

[0050] According to one embodiment of the present application, the plasticizer is preferably a mixture of one or two of dioctyl terephthalate and alkyl phenyl sulfonate, and the mass thereof is 1-15% of the mass of the acrylic elastomer.

[0051] Specifically, the addition of plasticizer to acrylic elastomer can adjust the fluidity and melt viscosity of acrylic elastomer, and is more conducive to the uniform dispersion of acrylic elastomer in GPPS grafted with acrylic functional groups, thereby forming a finer and more uniform dispersed phase.

[0052] In order to facilitate the understanding of those skilled in the art, the following abbreviations of chemical substances are supplemented: Di-2-ethylhexyl terephthalate; Dioctyl terephthalate, abbreviated as DOTP; epoxidized soybean oil, English name epoxidized soybean oil, abbreviated as ESO.

[0053] According to one embodiment of the present application, the antioxidant is a mixture of one or more of phenolic antioxidants 1010, antioxidants 1076, and antioxidants 1790 as the main antioxidant, and the mass is 0.1-1% of the total mass of ordinary polystyrene and acrylic elastomer; one or a mixture of two of phosphite antioxidants TNPP and phosphite antioxidants 168 is used as the auxiliary antioxidant, and the mass is 0.1-1% of the total mass of ordinary polystyrene and acrylic elastomer.

[0054] Specifically, ordinary polystyrene (GPPS) and acrylic elastomers are prone to thermal oxidation reactions during high-temperature processing. Under the action of heat and oxygen, the chemical bonds of the molecular chain break uncontrollably, generating active free radicals, triggering a series of chain thermal oxidation degradation reactions, and reducing the physical and chemical properties of ordinary polystyrene (GPPS) and acrylic elastomers. The role of antioxidants is to eliminate the earliest active free radicals and prevent the chain thermal oxidation degradation reactions from continuing, thereby ensuring the performance of ordinary polystyrene (GPPS) and acrylic elastomers.

[0055] It should be noted that the chemical name of the antioxidant 1010 is pentaerythritol tetrapropionate; the chemical name of the antioxidant 1076 is β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; the antioxidant 1790 is also called antioxidant CY, and its chemical name is 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione; the chemical name of the antioxidant 168 is tris[2.4-di-tert-butylphenyl] phosphite.

[0056] Based on the above embodiments, the embodiments of the present invention also propose a method for preparing a common polystyrene transparent compatible toughening agent, comprising the following steps: Step 1: first add 100 parts of common polystyrene (GPPS), 1-5 parts of functional group reactants, and 0.01-1 parts of catalysts into a stirring mixing barrel, stir for 2-3 minutes until the mixture is uniformly mixed, then successively add 0.5-5 parts of lubricants and 0.1-1 parts of antioxidants, stir for 4-5 minutes until the mixture is uniformly mixed, and set aside; Step 2: add the materials uniformly mixed in step 1 into a parallel twin-screw extruder, and extrude the strands after melting, shearing, dispersing, and homogenizing in the parallel twin-screw extruder, and cut the strands after cooling to obtain the first intermediate product. The temperature of the extruder is controlled at 200°C -260°C in the melting stage, 180°C -240°C in the shearing and dispersion stage, 180°C -220°C in the homogenizing stage, 180°C -260°C in the die head, 20-40rpm in the main engine speed, and the strips are cut after cooling. The product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm; Step 3: first add 100 parts of acrylic elastomer, 1-10 parts of silane coupling agent, and 1-30 parts of plasticizer into a stirring mixing barrel, stir for 2-3 minutes until the mixture is uniformly mixed, then add 0.1-1 parts of antioxidant, stir for 4-5 minutes until the mixture is uniformly mixed, and set aside; Step 4: add the materials uniformly mixed in Step 3 into a parallel twin-screw extruder, and extrude the strands after melting, shearing, dispersing, and homogenizing in the parallel twin-screw extruder, and cut the strands after cooling to obtain the second intermediate product. The temperature of the extruder in the melting stage is controlled at 140°C-180°C, the temperature in the shearing and dispersing stage is controlled at 120°C-160°C, the temperature in the homogenizing stage is controlled at 120°C-160°C, the temperature of the die head is controlled at 140°C-180°C, the main engine speed is 30-40rpm, and the strip is cut after cooling. The product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm; Step 5: 30-80 parts of the first intermediate product produced in step 2 and 10-50 parts of the second intermediate product produced in step 4 are mixed evenly according to proportion, added to the parallel twin-screw extruder, and the strips are extruded after melting, high shearing and dispersing, and homogenizing in the parallel twin-screw extruder. After the strips are cooled, they are cut to obtain the GPPS transparent compatible toughening agent. The temperature of the extruder in the melting stage is controlled at 220°C -260°C, the temperature in the shearing and dispersing stage is controlled at 200°C -240°C, the temperature in the homogenizing stage is controlled at 200°C -220°C, the temperature of the die head is controlled at 220°C -260°C, the main engine speed is 40-50rpm, and the strips are cut after cooling; the product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm.

[0057] It should be noted that when cutting the materials at the end, the size of the product needs to be controlled. If the particle size is too large or too small, the product quality may be unstable during use due to mixing and uneven feeding.

[0058] According to the preparation method of the common polystyrene transparent compatible toughening agent of the present application, the prepared common polystyrene transparent compatible toughening agent is added to common polystyrene through a simple blending process, has good compatibility with the common polystyrene, and appropriately improves the impact resistance of the common polystyrene while maintaining the transparency of the common polystyrene or having little impact, which is currently an effective method for ensuring the transparency and toughness of common polystyrene. Example

[0059] Figure 1 This is an experimental data diagram of a common polystyrene transparent compatible toughening agent provided by an embodiment of the present application, such as Figure 1 As shown: The experiment was carried out on three material ratios: The first is pure GPPS material, with a notched impact of 14 J / m, a tensile strength of 40 MPa, a flexural strength of 84 MPa, and a flexural modulus of 3136 MPa; The second type is GPPS with 1% by mass of ordinary polystyrene transparent compatible toughening agent added, and the notched impact is measured to be 20 J / m, the tensile strength is 39 MPa, the flexural strength is 82 MPa, and the flexural modulus is 3020 MPa; The third type is GPPS with 3% by mass of ordinary polystyrene transparent compatible toughening agent added. The notched impact was measured to be 26 J / m, the tensile strength was 37 MPa, the flexural strength was 79 MPa, and the flexural modulus was 2870 MPa.

[0060] Among them, the notched impact test uses the ASTM D256 standard test; the tensile strength test uses the ASTM D638 standard test; the flexural strength test uses the ASTM D790 standard test; and the flexural modulus test uses the ASTM D790 standard test.

[0061] The results show that the ordinary polystyrene transparent compatible toughening agent in this application effectively improves the impact resistance of ordinary polystyrene (GPPS) and significantly improves toughness. Although the rigidity parameters such as tensile strength, flexural strength and flexural modulus are slightly reduced, it is acceptable to exchange 2~3% rigidity for 43% toughness improvement. Therefore, users need to choose an appropriate dosage to add toughening agent according to actual needs.

[0062] The above embodiments are preferred implementation schemes of the present application. In addition, the present application may also be implemented in other ways. Any obvious replacement without departing from the concept of the present application is within the protection scope of the present application.

Claims

1. A common polystyrene transparent compatible toughening agent, characterized in that: The composition comprises the following components by weight: 20-80 parts of ordinary polystyrene; 10-50 parts of acrylic elastomer; 1-5 parts of functional group reactant; 0.01-1 parts of catalyst; 1-5 parts of silane coupling agent; 0.5-5 parts of lubricant; 1-30 parts of plasticizer; 0.1-1 parts of antioxidant; First, ordinary polystyrene and acrylic functional group modifier undergo grafting reaction under the action of a catalyst, so that ordinary polystyrene is grafted with acrylic functional groups, and has acrylic functional groups like acrylic elastomers; Secondly, silane coupling agents and plasticizers are added to acrylic elastomers to adjust the polarity and melt index of acrylic elastomers to be closer to the polarity and melt index of ordinary polystyrene; The modification of ordinary polystyrene and acrylic elastomer makes them meet the requirements of the polymer compatibility principle as much as possible, and finally makes ordinary polystyrene and acrylic elastomer completely compatible.

2. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The acrylic elastomer is one or a mixture of ethylene-ethyl acrylate copolymer, ethylene-methacrylate copolymer, ethylene-butyl acrylate copolymer, and the mass thereof accounts for 10-70% of the total mass.

3. A common polystyrene transparent compatible toughening agent according to claim 2, characterized in that: The acrylic elastomer is one of ethylene-ethyl acrylate copolymer and ethylene-methacrylate copolymer or a mixture of the two, and the mass of the acrylic elastomer accounts for 10-50% of the total mass.

4. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The functional group reactant is one or a mixture of maleic anhydride, methacrylic acid, acrylic acid, and glycidyl methacrylate, and the total mass is 0.5-10% of the mass of ordinary polystyrene.

5. A common polystyrene transparent compatible toughening agent according to claim 4, characterized in that: The multifunctional reactant is one of methacrylic acid and glycidyl methacrylate or a mixture of the two, and the total mass is 1-5% of the mass of ordinary polystyrene.

6. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The catalyst is one or a mixture of tetrabutyl titanate, diisopropylbenzene peroxide, di(tert-butylperoxyisopropyl)benzene, di(2,4-dichlorobenzoyl) peroxide, and the total mass is 0.01-5% of the mass of ordinary polystyrene.

7. A common polystyrene transparent compatible toughening agent according to claim 6, characterized in that: The catalyst is preferably one of dicumyl peroxide and di(2,4-dichlorobenzoyl) peroxide or a mixture of the two, and the total mass is 0.05-2% of the mass of ordinary polystyrene.

8. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The silane coupling agent is one or a mixture of vinyl triethoxysilane, vinyl tri(2-methoxyethoxy)silane, γ-aminopropyl triethoxysilane, γ-(2,3-epoxypropoxy)propyl trimethoxysilane, and γ-methacryloxypropyl trimethylsilane, and the total mass is 1-10% of the mass of the acrylic elastomer.

9. A common polystyrene transparent compatible toughening agent according to claim 8, characterized in that: The silane coupling agent is preferably one or a mixture of vinyl triethoxysilane, γ-methacryloxypropyl trimethylsilane, vinyl tri(2-methoxyethoxy)silane, and the total mass is 1-5% of the mass of the acrylic elastomer.

10. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The lubricant is one or a mixture of ethylene bisstearamide, erucamide, stearate, and stearic acid, and its mass is 1-10% of the mass of ordinary polystyrene.

11. A common polystyrene transparent compatible toughening agent according to claim 10, characterized in that: The lubricant is preferably one or a mixture of ethylene bisstearamide, stearic acid, and stearate, and the mass thereof is 1-5% of the mass of ordinary polystyrene.

12. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The plasticizer is one or a mixture of liquid paraffin, dioctyl terephthalate, epoxy soybean oil, and alkyl phenyl sulfonate, and its mass accounts for 1-20% of the mass of the acrylic elastomer.

13. A common polystyrene transparent compatible toughening agent according to claim 12, characterized in that: The plasticizer is preferably dioctyl terephthalate, alkyl phenyl sulfonate, or a mixture of both, and the mass of the plasticizer is 1-15% of the mass of the acrylic elastomer.

14. A common polystyrene transparent compatible toughening agent according to claim 1, characterized in that: The antioxidant is one or a mixture of phenolic antioxidant 1010, antioxidant 1076, and antioxidant 1790 as the main antioxidant, and the mass is 0.1-1% of the total mass of ordinary polystyrene and acrylic elastomer; one or a mixture of two of phosphite antioxidant TNPP and phosphite antioxidant 168 is used as the auxiliary antioxidant, and the mass is 0.1-1% of the total mass of ordinary polystyrene and acrylic elastomer.

15. A method for preparing a common polystyrene transparent compatible toughening agent, characterized in that: The following steps are involved: Step 1: First, add 100 parts of ordinary polystyrene (GPPS), 1-5 parts of functional group reactant, and 0.01-1 parts of catalyst into a mixing barrel, stir for 2-3 minutes until the mixture is evenly mixed, then add 0.5-5 parts of lubricant and 0.1-1 parts of antioxidant successively, stir for 4-5 minutes until the mixture is evenly mixed, and set aside; Step 2: Add the evenly mixed materials in step 1 into a parallel twin-screw extruder, and extrude the strands after melting, shearing, dispersing and homogenizing in the parallel twin-screw extruder. After the strands are cooled, they are cut to obtain the first intermediate product. The temperature of the extruder in the melting stage is controlled at 200°C -260°C, the temperature in the shearing and dispersing stage is controlled at 180°C -240°C, the temperature in the homogenizing stage is controlled at 180°C -220°C, the temperature of the die head is controlled at 180°C -260°C, the main engine speed is 20-40rpm, and the strands are cooled and cut. The product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm; Step 3: first add 100 parts of acrylic elastomer, 1-10 parts of silane coupling agent, and 1-30 parts of plasticizer into a mixing barrel, stir for 2-3 minutes until the mixture is uniformly mixed, then add 0.1-1 parts of antioxidant, stir for 4-5 minutes until the mixture is uniformly mixed, and set aside; Step 4: Add the evenly mixed materials obtained in step 3 into a parallel twin-screw extruder, and extrude the strands after being melted, sheared, dispersed, and homogenized by the parallel twin-screw extruder. After the strands are cooled, they are cut into pieces to obtain the second intermediate product. The temperature of the extruder is controlled at 140°C -180°C during the melting stage, 120°C -160°C during the shearing and dispersing stage, 120°C -160°C during the homogenization stage, 140°C -180°C during the die head, and the main engine speed is 30-40rpm. After the strands are cooled, they are cut into pieces. The product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm. Step 5: 30-80 parts of the first intermediate product produced in step 2 and 10-50 parts of the second intermediate product produced in step 4 are mixed evenly according to proportion, added to a parallel twin-screw extruder, and extruded into a strip after melting, high shear dispersion, and homogenization in the parallel twin-screw extruder. After the strip is cooled, it is cut to obtain a GPPS transparent compatible toughening agent. The temperature of the extruder is controlled at 220°C-260°C during the melting stage, 200°C-240°C during the shear dispersion stage, 200°C-220°C during the homogenization stage, 220°C-260°C during the die head, and the main engine speed is 40-50rpm. After the strip is cooled, it is cut; the product particles are cylindrical particles with a diameter of 2-3mm and a height of 2-3mm.

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