A syndiotactic polystyrene resin and a method for preparing the same, a resin composition, an article, and an application thereof

Abstract

The present application provides a kind of syndiotactic polystyrene resin and its preparation method, resin composition, product and application, the syndiotactic polystyrene resin contains butanone soluble;The mass percentage content of butanone soluble in the syndiotactic polystyrene resin is <5.8%;In the GPC spectrum of the butanone soluble, the percentage of the response signal integral area corresponding to the component with molecular weight ≤2000g / mol in total integral area is 8~30%.In the present application, the product including the syndiotactic polystyrene resin has excellent chemical cracking resistance while having low extract content in high temperature and high humidity environment, thereby having excellent surface performance.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a syndiotactic polystyrene resin and its preparation method, resin composition, products and applications. Background Technology

[0002] Syndiotactic polystyrene (SPS) is a high-performance crystalline polymer that combines lightweight, low water absorption, and chemical resistance, but suffers from low toughness. To improve its properties, SPS is often blended with polyamides to form compositions, and fillers (such as glass fiber) are frequently added to enhance rigidity. Despite this, the polyamide phase in the composition is still prone to swelling in alcoholic or aqueous environments, leading to environmental stress cracking (ESC). Therefore, the chemical stress cracking resistance of SPS-polyamide-filler blends still needs improvement. On the other hand, SPS is mainly prepared through coordination polymerization of styrene catalyzed by metallocene catalysts. This catalyst system has a single active center, allowing precise control of the stereoregular insertion of monomers, resulting in polymers with high stereoregularity. However, in the industrial production of SPS, chain transfer, active center deactivation, and coupling side reactions lead to the formation of low molecular weight SPS oligomers and atactic polystyrene. Therefore, when syndiotactic polystyrene is compounded with resins such as polyamide or fillers such as glass fiber and processed into products, especially under humid and hot conditions, these byproducts easily migrate to the surface of the products, leading to surface defects and affecting the appearance quality of the parts. Therefore, developing a syndiotactic polystyrene resin that enables its resin compositions and molded products to possess excellent resistance to chemical cracking while maintaining a low amount of small molecule precipitation under high temperature and high humidity environments, thereby achieving stable and excellent surface properties, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a syndiotactic polystyrene resin, its preparation method, resin composition, articles, and applications. The syndiotactic polystyrene resin solves the problem that existing products containing syndiotactic polystyrene resin cannot simultaneously achieve high chemical crack resistance and good surface properties, especially for alloy resin systems of polyamide and syndiotactic polystyrene.

[0004] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a syndiotactic polystyrene resin, wherein the syndiotactic polystyrene resin contains butanone-soluble matter; the mass percentage of butanone-soluble matter in the syndiotactic polystyrene resin is <5.8%; and in the GPC spectrum of the butanone-soluble matter, the percentage of the integrated area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol accounts for 8% to 30% of the total integrated area.

[0005] In this invention, by controlling the content of methyl ethyl ketone (MEK) solubles in syndiotactic polystyrene resin and the proportion of MEK solubles with a molecular weight ≤2000 g / mol within a specific range, it is beneficial to ensure the surface properties of the product and also to ensure that the product has high resistance to chemical cracking. In the GPC spectrum of the MEK solubles, if the proportion of the integrated area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol to the total integrated area is less than 8%, it is used in alloy resins, resulting in insufficient interphase buffering capacity, stress concentration, and poor chemical cracking resistance of the product; if it is greater than 30%, the content of precipitates increases under high temperature and high humidity conditions, and the surface properties decrease.

[0006] In this invention, in the GPC spectrum of the butanone soluble substance, the percentage of the integrated area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol to the total integrated area is 8% to 30%, for example, it can be 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30% or any of the above values, more preferably 14.5% to 28.5%.

[0007] In this invention, the molecular weight range of the butanone soluble substance is 100~1,000,000 g / mol, and the molecular weight distribution coefficient of the butanone soluble substance is preferably 1.1~16.

[0008] In this invention, in the GPC spectrum of the butanone soluble substance, the percentage of the integrated area of ​​the response signal corresponding to the component with a molecular weight > 2000 g / mol accounts for 70% to 92% of the total integrated area.

[0009] In this invention, the weight-average molecular weight of the butanone soluble substance is preferably 2000~21000 g / mol.

[0010] In this invention, the mass percentage of butanone-soluble matter in the syndiotactic polystyrene resin is <5.8%, and can be, for example, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.6%, 2.8%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, 5.2%, 5.4%, 5.6%, 5.8%, or any of the above values, more preferably 0.6% to 4.5%.

[0011] In this invention, the methyl ethyl ketone solubles refer to substances that can be dissolved by methyl ethyl ketone under specific conditions, including but not limited to byproducts generated during the preparation of syndiotactic polystyrene. Specifically, the methyl ethyl ketone solubles include at least one of atactic polystyrene and low molecular weight syndiotactic polystyrene; the low molecular weight syndiotactic polystyrene is selected from syndiotactic polystyrene with a weight average molecular weight of 2000~21000 g / mol.

[0012] In this invention, the melt index of the syndiotactic polystyrene resin is preferably 1~35 g / 10 min.

[0013] In this invention, the melt index of the syndiotactic polystyrene resin was tested according to the ISO 1133-1:2022 standard method at 300°C and under a 1.2 kg load.

[0014] In this invention, the weight-average molecular weight of the syndiotactic polystyrene resin is preferably 1.2 × 10⁻⁶. 5 g / mol ~ 2.8 × 10 5 g / mol.

[0015] In this invention, both the molecular weight and molecular weight distribution coefficient can be obtained by gel permeation chromatography.

[0016] In a second aspect, the present invention provides a method for preparing syndiotactic polystyrene according to the first aspect, the method comprising: subjecting styrene monomer to an addition polymerization reaction in the presence of a catalyst, an inert solvent and a nitrogen-hydrogen mixture to obtain a polymerization product; and post-treating the polymerization product to obtain the syndiotactic polystyrene resin, wherein the catalyst comprises the following components.

[0017] (A) Titanium chromatographite compounds.

[0018] (B) Alkyl aluminum oxane b1, and / or compound b2 that can react with titanium metal compounds to form ionic complexes.

[0019] And optionally (C) at least one aluminum compound.

[0020] In this invention, the inert solvent includes at least one of C3-C8 alkanes, C3-C8 cycloalkanes, and C6-C8 aromatics.

[0021] In this invention, the volume fraction of hydrogen in the nitrogen-hydrogen mixture is 0.2% to 15%, for example, it can be 0.2%, 0.4%, 0.6%, 0.8%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15% or any range between the above values.

[0022] In this invention, the C3-C8 alkanes can be straight-chain alkanes or branched-chain alkanes, such as C4, C5, C6, and C7 alkanes, including but not limited to n-propane, n-butane, n-pentane, n-hexane, n-heptane, n-octane, isopropane, isobutane, neopentane, etc.

[0023] In this invention, the C3-C8 cycloalkanes can be C3-C8 cycloalkanes without substituents, or cycloalkanes with a total carbon number of 3-8 including substituents; for example, they can be C4, C5, C6, and C7 cycloalkanes, including but not limited to cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, methylcyclohexane, ethylcyclohexane, methylcyclobutane, etc.

[0024] In this invention, the C6-C8 aromatic hydrocarbons include toluene, ethylbenzene, etc.

[0025] Preferably, the inert solvent includes at least one of n-hexane, n-pentane, cyclopentane, or toluene.

[0026] In this invention, the post-processing method includes: performing a first devolatilization on the polymer product within a temperature range from its glass transition temperature to its melting point to obtain a first devolatilization product; placing the first devolatilization product in an extruder and performing a second devolatilization on it within a temperature range from its melting point to 350°C and under a pressure ≤30kPa.

[0027] In this invention, the first devolatilization is carried out in a reaction vessel for 1 to 4 hours; the devolatilization pressure is -0.05 to -0.2 MPa; and the temperature of the first devolatilization can be 110 to 270°C.

[0028] In this invention, the temperature of the second devolatilization can be 280~350℃.

[0029] In this invention, the second devolatilization time (i.e., the residence time in the extruder) is 30s to 10min.

[0030] In this invention, the glass transition temperature and melting point can be obtained through DSC testing.

[0031] In this invention, the glass transition temperature of the syndiotactic polystyrene resin is 100-110℃, and the melting point is about 270℃.

[0032] In this invention, there is no particular limitation on the contact order of the components in the catalyst. A catalyst solution can be prepared by mixing components (A) and (B) and component (C) in a suitable solvent to dilute the catalyst; the solvent may be, for example, toluene and / or ethylbenzene. Exemplarily, the preparation method of the catalyst includes: mixing components (B) and (C) separately with a solvent to obtain component (B) solution and component (C) solution, each with a mass fraction of 5-15%; and mixing component (A), component (B) solution, and component (C) solution according to the formulation amount to obtain the catalyst.

[0033] In this invention, the contact temperature of each component in the catalyst is 0℃~100℃, and the contact occurs in an inert atmosphere such as nitrogen or argon.

[0034] Preferably, the general formula of component (A) is R 1 TiX 1 X 2 X 3 .

[0035] Among them, R 1 Selected from any one of substituted or unsubstituted cyclopentadienyl, substituted or unsubstituted indenyl, or fused polycyclic cyclopentadienyl containing at least one saturated ring; X 1 X 2 and X 3 Each of the substituents is independently selected from any one of hydrogen atoms, halogen atoms, C1~C12 alkyl, C1~C12 alkoxy, C1~C12 alkylsilyl, C6~C20 aryl, C6~C20 aryloxy, C6~C20 arylsilyl, and C7~C20 arylalkyl; the substituents include halogen atoms, C1~C12 alkyl, C1~C12 alkoxy, C6~C20 aryl, C6~C20 aryloxy, and C7~C20 arylalkyl, and when the number of substituents is greater than 1, the substituents may be the same or different.

[0036] In this invention, the C1~C12 alkyl group can be, for example, C1, C2, C4, C6, C8, C10, or C11 alkyl; it can be a straight-chain alkyl group or a branched-chain alkyl group, and exemplary includes, but is not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, n-pentyl, n-hexyl, n-decyl, etc.; the same expressions in the following text have the same meaning.

[0037] In this invention, the C1~C12 alkoxy groups can be, for example, C1, C2, C4, C6, C8, C10, or C11 alkoxy groups; exemplary, including but not limited to methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, n-pentoxy, n-hexoxy, and n-decoxy groups; the same expressions in the following text have the same meaning.

[0038] In this invention, C6 to C20 aryl groups can be, for example, C6, C8, C10, C12, C14, C16, or C18 aryl groups; exemplary, including but not limited to phenyl, biphenyl, naphthyl, phenanthryl, anthracene, etc.; the same expressions in the following text have the same meaning.

[0039] In this invention, the C6~C20 aryloxy group can be, for example, C6, C8, C10, C12, C14, C16, or C18 aryloxy groups; the aryloxy group refers to a group formed by replacing one H with an O in the aforementioned C6~C20 aryl groups; the same expression in the following text has the same meaning.

[0040] In this invention, C7-C20 aralkyl groups can be, for example, C7, C8, C10, C12, C14, C16, or C18 aralkyl groups; the aralkyl group refers to a group formed by replacing at least one H in the aforementioned C6-C20 aryl groups with an alkyl group; the same expressions in the following text have the same meaning.

[0041] In this invention, C1~C12 alkylsilyl groups can be, for example, C1, C2, C4, C6, C8, C10, or C11 alkylsilyl groups; the alkylsilyl group refers to a group formed by replacing at least one H in a silane with an alkyl group; the same expressions in the following text have the same meaning; wherein, the linking site can be in an alkyl group or in a silyl group.

[0042] In this invention, C6~C20 arylsilyl groups can be, for example, C8, C10, C14, C16, or C18 arylsilyl groups; the arylsilyl group refers to a group formed by replacing at least one H in a silane with an aryl group; the same expressions in the following text have the same meaning; wherein, the linking site can be in the aryl group or in the silyl group.

[0043] In this invention, the halogen atoms include F, Cl, Br, and I.

[0044] In this invention, the number of substituents in "substituted or unsubstituted" is ≥1. When the number of substituents is greater than 1, the substituents can be the same or different.

[0045] In this invention, the titanium-containing metal compounds include cyclopentadienyltriethyltitanium, cyclopentadienyltributyltitanium, cyclopentadienyltrimethyltitanium, pentamethylcyclopentadienyltriethyltitanium, pentamethylcyclopentadienyltrimethyltitanium, pentamethylcyclopentadienyltributyltitanium, cyclopentadienyltrimethoxytitanium, cyclopentadienyltriethoxytitanium, pentamethylcyclopentadienyltrimethoxytitanium, pentamethylcyclopentadienyltrichloride, cyclopentadienyltriphenoxytitanium, cyclopentadienylmonophenoxytitanium chloride, cyclopentadienyltribenzyltitanium, and cyclopentadienyl... At least one of methyl dibenzyl titanium, indene trichloride titanium, indene trimethoxy titanium, indene trimethyl titanium, indene tribenzyl titanium, octahydrofluorenyl trimethoxy titanium, 9-isopropyl-octahydrofluorenyl trimethoxy titanium, 4,5,6,7-tetrahydroindene trimethoxy titanium, 1,2,3,4-tetramethyl-octahydrofluorenyl trimethoxy titanium, 1-trimethylsilyl-2-methyl-4,5,6,7-tetrahydroindene trimethoxy titanium, and 1-dimethylphenylsilyl-2-methyl-4,5,6,7-tetrahydroindene trichloride titanium.

[0046] Preferably, the alkylaluminoxane b1 is selected from C1-C8 straight-chain alkylaluminoxanes.

[0047] In this invention, the alkylaluminoxane b1 is a reaction product of C1~C8 straight-chain alkylaluminum and water.

[0048] In this invention, the alkylaluminoxane b1 includes at least one of methylaluminoxane, ethylaluminoxane, n-propylaluminoxane, n-butylaluminoxane, n-pentylaluminoxane, n-hexylaluminoxane, and n-heptylaluminoxane.

[0049] Preferably, the general formula of compound b2 is [R 2 3C] + [MX 4 q ] - .

[0050] Among them, R 2 Selected from at least one of alkyl groups with ≥1 carbon atom and aryl groups with ≥6 carbon atom, R 2 Same or different; M is selected from at least one of B, Al, Si, P, and As; X 4 The group is selected from at least one of C1-C12 alkyl, C1-C12 alkoxy, C6-C20 aryl, C6-C20 aryloxy, C7-C20 aralkyl, and C6-C20 haloaryl, where q is an integer from 2 to 8, and X 4 Same or different.

[0051] In this invention, compound b2 includes at least one of triphenylmethyltetraphenylborate, triphenylmethyl-tetra(pentafluorophenyl)borate, tri(2,4,6-trimethylphenyl)methyltetra(pentafluorophenyl)borate, and triphenylmethyltetra(3,5-bistrifluoromethylphenyl)borate.

[0052] Preferably, the general formula of the component (C) is R 3 p AlH 3-p .

[0053] Among them, R 3 Selected from C1-C8 alkyl groups, which can be straight-chain alkyl groups or branched alkyl groups, such as C1, C2, C3, C4, C5, C6, C7, and C8 alkyl groups, including but not limited to methyl, ethyl, n-propyl, isopropyl, isobutyl, n-butyl, n-pentyl, and n-hexyl; 0 ≤ p ≤ 3; when p > 1, R 3 Same or different.

[0054] In this invention, component (C) includes at least one of triisobutylaluminum, trimethylaluminum, triethylaluminum, triisopropylaluminum, diisobutylaluminum hydride, tri-n-butylaluminum, tri-n-hexylaluminum, di-n-butylaluminum, diisopropylaluminum, and n-butylaluminum.

[0055] Preferably, the molar ratio of aluminum to the titanoceramic metal compound in the alkylaluminoxane b1 is (10~1000):1, wherein the specific value of (10~1000) can be, for example, 20, 50, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000 or any range between the above values.

[0056] Preferably, the molar ratio of M to the titanium metal compound in compound b2 is (0.5~10):1, wherein the specific values ​​in (0.5~10) can be, for example, 0.6, 0.8, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or any range between the above values.

[0057] Preferably, the molar ratio of aluminum to titanium metal compound in component (C) is (10~1000):1, wherein the specific value of (10~1000) can be, for example, 20, 50, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000 or any range between the above values.

[0058] Preferably, the concentration of the titanoceramic metal compound relative to styrene is 1 × 10⁻⁶. -7 ~5×10 -4 mol / L, for example, 2×10 -7 mol / L, 4×10 -7 mol / L, 6×10 -7 mol / L, 8×10 -7 mol / L, 1×10 -6 mol / L, 2×10 -6 mol / L, 4×10 -6 mol / L, 6×10 -6 mol / L, 8×10 -6 mol / L, 1×10 -5 mol / L, 2×10 -5 mol / L, 4×10 -5 mol / L, 6×10 -5 mol / L, 8×10 -5 mol / L, 1×10 -4 mol / L, 2×10 -4 mol / L, 4×10 -4 The range of mol / L or any of the above values ​​is more preferably 5 × 10⁻⁶. -6 ~2×10 -4 mol / L, more preferably 1×10 -5 ~1×10 -4 mol / L.

[0059] Preferably, the temperature of the addition polymerization reaction is 75°C to 100°C, for example, it can be 75°C, 80°C, 85°C, 90°C, 95°C or any range between the above values.

[0060] Preferably, the pressure of the addition polymerization reaction is 0 MPa to 10 MPa, for example, it can be 0 MPa, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa or any range between the above values.

[0061] In this invention, the pressure is measured using an apparent pressure gauge.

[0062] Preferably, the preparation method includes: continuously feeding styrene and a catalyst into a reactor in the presence of a nitrogen-hydrogen mixture, while simultaneously feeding an inert solvent into the reactor to carry out an addition polymerization reaction.

[0063] In this invention, the reactor is pre-filled with particles and is in a fluidized state. The particles are sPS powder, i.e., syndiotactic polystyrene resin powder, used to maintain the solid-phase dispersion state and ensure the phase stability of the system; the sPS powder is a fine powder with a particle size (D50) of 50-500 μm, dried to constant weight and then placed in the reactor; this invention has no special requirements for the syndiotactic polystyrene (sPS) powder, and commercially available products or laboratory-made samples are applicable.

[0064] In this invention, the particle size of the sPS powder is tested using a woven wire sieve according to ISO 3310-1:2016 standard.

[0065] In this invention, the content of methyl ethyl ketone (MEK) solubles in syndiotactic polystyrene resin can be controlled by adjusting the composition of the catalyst (including the types and ratios of each component), the volume fraction of hydrogen in the nitrogen-hydrogen mixture, the type of inert solvent, the polymerization process, and the post-treatment process. This allows for the control of the proportion of the integral area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol in the GPC spectrum of the MEK solubles to the total integral area.

[0066] In this invention, the preparation method of the syndiotactic polystyrene resin is not limited to the above-mentioned method, and any method that can obtain the specific syndiotactic polystyrene resin of this invention is acceptable; for example, the syndiotactic polystyrene resin of this invention can also be obtained by mixing syndiotactic polystyrene resins with different methyl ethyl ketone (MEK) soluble contents and different MEK soluble compositions (i.e., in the GPC spectrum of MEK solubles, the percentage of the response signal integral area corresponding to the component with a molecular weight ≤2000 g / mol to the total integral area).

[0067] Thirdly, the present invention provides a resin composition comprising syndiotactic polystyrene resin, and further comprising at least one of filler, a second resin, a compatibilizer, and other additives; wherein the syndiotactic polystyrene resin is the syndiotactic polystyrene resin described in the first aspect.

[0068] Preferably, the resin composition contains ≥20% by mass of meso-regulated polystyrene resin, for example, 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 98%, or any range of the above values.

[0069] Preferably, by weight, the resin composition comprises 20-100 parts of syndiotactic polystyrene resin (e.g., 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts, or any range thereof), 0.5-50 parts of filler (e.g., 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 ​​parts, 50 parts, or any range thereof), and 3-60 parts of [unspecified ingredient]. The resin (e.g., 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts or any of the above values), 0.1 to 10 parts of compatibilizer (e.g., 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts or any of the above values), and 0 to 20 parts of other additives (e.g., 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts or any of the above values).

[0070] Preferably, the filler includes at least one of fibrous filler, granular filler, and powdered filler.

[0071] Preferably, the fibrous filler includes at least one of glass fiber, carbon fiber, whiskers, ceramic fiber, and metal fiber.

[0072] Preferably, the granular filler and the powdered filler are each independently selected from at least one of talc, carbon black, graphite, titanium dioxide, silicon dioxide, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, tin oxide, aluminum oxide, kaolin, silicon carbide, metal powder, glass powder, glass flakes, and glass microspheres.

[0073] In this invention, when the filler is selected from glass fillers, the glass used includes at least one of E glass, C glass, S glass, D glass, ECR glass, A glass, AR glass, boron-free glass, and fluorine-free glass.

[0074] Preferably, the length of the glass fiber is 0.05 mm to 50 mm, for example, it can be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or any of the above values; the diameter is 5 μm to 20 μm, for example, it can be 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm or any of the above values.

[0075] Preferably, the second resin comprises polyamide, more preferably at least one of polycaprolactam (PA6), polyhexamethylene adipamide (PA66), polyundecanoamide (PA11), polydodecanoamide (PA12), polyhexamethylenediamine sebacate amide (PA610), polyhexamethylenediamine dodecanoic acid amide (PA612), polydecanoic acid sebacate amide (PA1010), polydodecanoic acid sebacate amide (PA1012), polydodecanoic acid sebacate amide (PA1212), polyhexamethylenediamine terephthalamide (PA-6T), polynonadiamine terephthalamide (PA-9T), and polydecanoic acid terephthalamide (PA-10T).

[0076] Preferably, the compatibilizer comprises modified styrene-based polymers and / or modified polyphenylene ether-based polymers.

[0077] Preferably, the modified styrene-based polymer includes at least one of the following: styrene-maleic anhydride copolymer, styrene-glycidyl methacrylate copolymer, terminal carboxylic acid modified polystyrene, terminal epoxy modified polystyrene, terminal oxazoline modified polystyrene, terminal amine modified polystyrene, sulfonated polystyrene, styrene-based ionomer, styrene-methyl methacrylate copolymer, styrene-glycidyl methacrylate-methyl methacrylate terpolymer, acrylate-styrene copolymer, styrene-b-glycidyl methacrylate-b-styrene, polybutylene terephthalate-g-polystyrene, maleic anhydride modified syndiotactic polystyrene, fumaric acid modified syndiotactic polystyrene, glycidyl methacrylate modified syndiotactic polystyrene, and amine modified syndiotactic polystyrene.

[0078] Preferably, the modified polyphenylene ether polymer includes at least one selected from styrene-maleic anhydride-polyphenylene ether-grafted polymer, maleic anhydride modified polyphenylene ether, fumaric acid modified polyphenylene ether, glycidyl methacrylate modified polyphenylene ether, and amine modified polyphenylene ether.

[0079] Preferably, the polyphenylene ether in the modified polyphenylene ether polymer includes poly(2,6-dimethyl-1,4-phenylene ether), poly(2,3-dimethyl-6-ethyl-1,4-phenylene ether), poly(2-methyl-6-chloromethyl-1,4-phenylene ether), poly(2-methyl-6-hydroxyethyl-1,4-phenylene ether), poly(2-methyl-6-n-butyl-1,4-phenylene ether), poly(2-ethyl-6-isopropyl-1,4-phenylene ether), poly(2-ethyl-6-n-propyl-1,4-phenylene ether), poly(2,3,6-trimethyl-1,4-phenylene ether), poly[2-(4′-methylphenyl)-1,4-phenylene ether], poly(2-bromo-6-phenyl-1,4-phenylene ether), poly(2-methyl- At least one of 6-phenyl-1,4-phenylene ether, poly(2-phenyl-1,4-phenylene ether), poly(2-chloro-1,4-phenylene ether), poly(2-methyl-1,4-phenylene ether), poly(2-chloro-6-ethyl-1,4-phenylene ether), poly(2-chloro-6-bromo-1,4-phenylene ether), poly(2,6-di-n-propyl-1,4-phenylene ether), poly(2-methyl-6-isopropyl-1,4-phenylene ether), poly(2-chloro-6-methyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2,6-dibromo-1,4-phenylene ether), poly(2,6-dichloro-1,4-phenylene ether), and poly(2,6-diethyl-1,4-phenylene ether).

[0080] In this invention, the grafting rate of maleic anhydride in the maleic anhydride-modified polyphenylene ether is 0.5% to 5%; the grafting rate of fumaric acid in the fumaric acid-modified polyphenylene ether is 0.5% to 5%; and the grafting rate is the mass fraction of the grafting monomer relative to the modified polyphenylene ether.

[0081] In this invention, the modified polyphenylene ether polymer can be prepared by polyphenylene ether and a modifier; specifically, it includes: in the presence of an initiator, polyphenylene ether and a modifier are melt-blended on an extruder at a temperature of 250°C to 350°C to obtain the modified polyphenylene ether polymer.

[0082] Preferably, the other additives include at least one of rubbery elastomers, antioxidants, lubricants, crosslinking agents, crosslinking aids, nucleating agents, plasticizers, flame retardants, colorants, and antistatic agents.

[0083] In this invention, the rubber-like elastomer includes, but is not limited to, at least one of styrene-butadiene block copolymer (SBR), hydrogenated styrene-butadiene block copolymer (SEB), styrene-butadiene-styrene block copolymer (SBS), hydrogenated styrene-butadiene-styrene block copolymer (SEBS), styrene-isoprene block copolymer (SIR), hydrogenated styrene-isoprene block copolymer (SEP), styrene-isoprene-styrene block copolymer (SIS), and hydrogenated styrene-isoprene-styrene block copolymer (SEPS).

[0084] In this invention, the antioxidants include, but are not limited to, primary antioxidants, such as any one or a combination of at least two of the following: 2,6-di-tert-butyl-p-cresol (BHT), 2,2'-methylene-bis(4-ethyl-6-tert-butylphenol), 2,2'-methylene-bis(4-methyl-6-tert-butylphenol), 2,2'-methylene-bis(4-methyl-6-cyclohexylphenol), 2,2'-methylene-bis(4-methyl-6-nonylphenol), octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane, and pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxyhydrocinnamate); and secondary antioxidants, such as tri(nonylphenyl) phosphite and / or dilauryl thiodipropionate.

[0085] In this invention, the lubricant includes, but is not limited to, at least one of ethylene bis-stearamide (EBS), glyceryl monostearate, oleamide, and erucamide.

[0086] In this invention, the crosslinking agent includes, but is not limited to, dicumyl peroxide, benzoyl peroxide, divinylbenzene, vinyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, etc.

[0087] In this invention, the crosslinking aids include, but are not limited to, triallyl isocyanurate, trimethylolpropane trimethacrylate, etc.

[0088] In this invention, the nucleating agent includes, but is not limited to, any one or a combination of at least two of the following: organophosphate nucleating agents, organophosphate metal salt nucleating agents, sorbitol nucleating agents, and carboxylic acid metal salt nucleating agents.

[0089] In this invention, the plasticizers include, but are not limited to, dioctyl phthalate, diisononyl phthalate, dioctyl adipate, dioctyl sebacate, and epoxidized soybean oil.

[0090] In this invention, the flame retardant includes, but is not limited to, ammonium polyphosphate, melamine cyanurate, triphenyl phosphate, resorcinol bisphenyl phosphate, phosphazene compounds, zinc borate, zinc oxide, aluminum hydroxide, antimony trioxide, and organic aluminum phosphonates.

[0091] In this invention, the antistatic agent includes, but is not limited to, quaternary ammonium salt antistatic agents, fatty acid ester antistatic agents, etc.

[0092] In this invention, the method for preparing the resin composition includes: mixing syndiotactic polystyrene resin and optionally fillers, a second resin, a compatibilizer, and other additives, and extruding to obtain the resin composition.

[0093] Fourthly, the present invention provides an article comprising the syndiotactic polystyrene resin described in the first aspect or the resin composition described in the third aspect.

[0094] In this invention, the products include, but are not limited to, household goods, electronic components, home appliances, gardening equipment, medical technology equipment, motor vehicle parts, and vehicle body parts; for example, the household goods include, but are not limited to, food containers, tableware, food storage containers, bathroom fixtures, shelves, storage boxes, wardrobes, cabinets, lamp housings, and blinds; the electronic components include, but are not limited to, SMT components, capacitors, transformers, LED lamp covers, and computer housings; the home appliances include, but are not limited to, rice cookers, microwave ovens, coffee machines, air conditioners, washing machines, refrigerators, and vacuum cleaners; and the gardening equipment includes, but is not limited to, water pumps. Impellers, valves, connectors, filter housings, scissors, nozzles, flower pots, flower stands, etc.; the medical technology equipment includes, but is not limited to, disposable syringes, sterilizers, medicine bottles, surgical instruments, dialysis components, sterile containers, etc.; the motor vehicle components include, but are not limited to, engine compartment components (such as ignition coil housings, sensor housings, water pump impellers, cooling system components), automotive electronics (such as connectors, ECU housings, wiring harness connectors, radar covers, battery management system components), interior and exterior trim (such as dashboards, door panels, interior support brackets, seat frames), functional components (such as fan blades, rearview mirror brackets, door lock components, sunroof components, etc.).

[0095] Fifthly, the present invention provides the use of syndiotactic polystyrene resin as described in the first aspect or resin composition as described in the third aspect in the preparation of household goods, electronic components, household appliances, gardening equipment, medical technology equipment, and motor vehicle parts.

[0096] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0097] Compared with the prior art, the beneficial effects of the present invention are as follows: The syndiotactic polystyrene resin provided by the present invention contains butanone solubles, and by controlling the content of butanone solubles and the proportion of components with a molecular weight ≤2000g / mol in the butanone solubles within a specific range, products including the syndiotactic polystyrene can possess both high chemical crack resistance and surface properties. Detailed Implementation

[0098] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0099] In this invention, the method for testing the content of methyl ethyl ketone (MEK) solubles includes: crushing the test sample (i.e., syndiotactic polystyrene particles) into powder (35 mesh) using a solid pulverizer (Changzhou Surui Instrument Co., Ltd., XA-3), and then drying it to constant weight. Take 5.0000±0.0100g of the dried powder, weigh it and record the weight as m1, and wrap it tightly with type 102 qualitative filter paper as specified in GB / T1914-2017 to prepare the test sample. Place three of the above test samples in a Soxhlet extractor with an effective working volume of 250mL and a bottom flask volume of 1000mL. Use 650mL of once-distilled MEK as solvent, and continuously reflux extract for 10h at the solvent temperature at the solvent boiling point, with 3±0.5 complete extraction cycles per hour. After extraction, the sample was removed and thoroughly washed three times with ethanol. It was then placed in a vacuum drying oven, and the vacuum was slowly drawn to -0.1 MPa, followed by gradual heating (at a rate of 5 K / min) to 150 °C. The drying oven was equipped with a cold trap containing liquid nitrogen, which was replaced periodically. The sample mass after constant weight was deducted from the filter paper and recorded as m2; the content of methyl ethyl ketone solubles = (m... 1- m2) / m1×100%.

[0100] In this invention, in the GPC spectrum of the butanone-soluble compound, the percentage of the integrated area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol relative to the total integrated area (denoted as M) is defined as follows: ≤2000The analysis was performed using an Agilent 1260 gel permeation chromatography system. The chromatographic columns consisted of three columns connected in series: PLgel 5μm Mixed-c (300mm × 7.5mm), PLgel 10μm Mixed-b (300mm × 7.5mm), and PLgel 5μm Guard (50mm × 7.5mm). Molecular weight was determined using a differential refractive index (RI) detector, calculated according to the standard calibration curve for polystyrene standards. The molecular weights mentioned are the apparent molecular weights measured by GPC, and the standard molecular weight calibration range is 580–6,570,000. Molecular weights below 580 are extrapolated values ​​calculated based on the calibration curve extension. Tetrahydrofuran was used as the mobile phase at a flow rate of 1 mL / min and a column temperature of 35 °C. The sample was dissolved in tetrahydrofuran (2 mg / mL) and injected in 20 μL. Data were processed using Agilent GPC software to calculate the percentage of the integral area corresponding to the component with a molecular weight ≤2000 g / mol to the total integral area; molecular weight distribution data obtained under the same test conditions and calibration system are comparable.

[0101] Example 1 This embodiment provides a syndiotactic polystyrene resin, wherein the mass percentage of butanone-soluble matter in the syndiotactic polystyrene resin is 2.2%, M ≤2000 It is 26%.

[0102] The preparation method of the syndiotactic polystyrene resin includes: subjecting styrene monomer to an addition polymerization reaction in the presence of a catalyst, n-hexane, and a nitrogen-hydrogen mixture with a hydrogen gas fraction of 1% to obtain the syndiotactic polystyrene.

[0103] The catalyst comprises the following components.

[0104] (A) Pentamethylcyclopentadienyl titanium trichloride.

[0105] (B) Methylaluminoxane.

[0106] (C) Triisobutylaluminum.

[0107] The amount of component (A) relative to styrene is 5 × 10⁻⁶. -5 mol / L. The molar ratio of aluminum in the methylaluminoxane to component (A) is 100:1; the molar ratio of aluminum in the triisobutylaluminum to component (A) is 200:1. Toluene is used as the solvent for preparing the catalyst. Components triisobutylaluminum and methylaluminoxane are mixed with toluene separately to prepare a 10% mass fraction toluene solution of triisobutylaluminum and a 10% mass fraction toluene solution of methylaluminoxane. Then, the toluene solution of methylaluminoxane, the toluene solution of triisobutylaluminum, and pentamethylcyclopentadienyl titanium trichloride are mixed according to the formula to obtain a mixed catalyst.

[0108] The specific method includes: heating a 100L vertical reactor with a double-ribbon agitator to 100℃, vacuum drying for 2 hours, purging with high-purity nitrogen three times, and finally replacing with a nitrogen-hydrogen mixture with a hydrogen integral of 1%, maintaining a slightly positive pressure inside the reactor (i.e., a pressure of 50 kPa). Once the reactor temperature drops to 80℃, 25 kg of pre-treated SPS powder (D50 of 300 μm) is added to the reactor and dried under a nitrogen flow for 2 hours. Then, according to the formulation, the mixed catalyst and styrene are continuously added to the reactor at a styrene flow rate of 10 L / h. Simultaneously, n-pentane is supplied to the reactor. By controlling the reactor pressure and condensate reflux flow rate, the internal temperature is maintained at 80 ± 1℃. After continuous operation for 2 hours, the bottom discharge valve of the reactor is opened and then opened every 20 minutes to obtain the polymerization product. The polymerization product is post-treated. The post-treatment method includes placing the polymerization product in a reaction vessel after the reaction is completed, and de-vaporizing it at 150°C and -0.1MPa for 2 hours. The obtained product is then added to an extruder and de-vaporized a second time at 300°C and 15kPa for 2 minutes to obtain the syndiotactic polystyrene resin.

[0109] Examples 2-7 and Comparative Examples 1-3 each provide a syndiotactic polystyrene resin, with a mass percentage of butanone-soluble matter and M... ≤2000 The specific process parameters are shown in Table 1-2. Unless otherwise specified, the preparation methods are the same as those in Example 1, with the only differences being the type of catalyst, the ratio, and the reaction conditions.

[0110] The preparation method of syndiotactic polystyrene resin provided in Comparative Example 1 includes: heating a 100L vertical reactor with a double-ribbed agitator to 100°C, vacuum drying for 2 hours, purging with high-purity nitrogen three times, and finally purging with a nitrogen-hydrogen mixture with a hydrogen integral of 1%, maintaining a slight positive pressure (i.e., a pressure of 50 kPa) inside the reactor. After the reactor temperature drops to 80°C, 25 kg of sPS powder (D50 of 300 μm) pre-treated with dry nitrogen is added to the reactor and dried under a nitrogen flow for 2 hours. Then, the mixed catalyst (with the same formulation as in Example 1) and styrene are continuously added to the reactor at a styrene flow rate of 10 L / h. After continuous operation for 2 hours, the bottom discharge valve of the reactor is opened and opened every 20 minutes to obtain the polymerization product. The polymerization product is then post-treated using the same process as in Example 1. After continuous operation for 60 hours, the reactor temperature rises to 90°C, and operation is stopped.

[0111] Example 8 This embodiment provides a syndiotactic polystyrene resin. The preparation method of the syndiotactic polystyrene resin includes: taking 20g of syndiotactic polystyrene from Comparative Example 3, 30g of syndiotactic polystyrene from Example 6, and 50g of syndiotactic polystyrene from Example 7, and mixing them thoroughly and uniformly to obtain the syndiotactic polystyrene; the mass content of butanone-soluble matter in the syndiotactic polystyrene is 2.3%, M ≤2000 It is 25%.

[0112] Comparative Example 4 This comparative example provides a syndiotactic polystyrene resin. The preparation method of the syndiotactic polystyrene resin differs from that of Comparative Example 3 only in that the devolatilization post-treatment step is omitted; all other steps are the same as in Comparative Example 3. The obtained syndiotactic polystyrene resin has a butanone-soluble content of 6.6% by mass. ≤2000 It is 4%.

[0113] Table 1 Table 2 In this invention, the materials used in the application examples and comparative application examples can be purchased commercially or prepared using conventional methods; unless otherwise specified, the materials used in this invention are as follows.

[0114] Polyphenylene oxide (PPE): LXR035.

[0115] Maleic anhydride modified polyphenylene ether (PPE-MAH): 1 kg of the polyphenylene ether, 40 g of maleic anhydride and 0.1 g of dicumyl peroxide are dry-mixed and then melt-extruded and granulated at 250 °C to obtain the particulate compatibilizer of the maleic anhydride modified polyphenylene ether.

[0116] Fumaric acid modified polyphenylene ether (PPE-FA): 1 kg of the polyphenylene ether, 40 g of fumaric acid and 0.1 g of dicumyl peroxide are dry mixed and then melt-extruded and granulated at 250 °C to obtain the particulate compatibilizer of the fumaric acid modified polyphenylene ether.

[0117] Glass fiber (GF-1): ECS301HP-3-H.

[0118] Application Examples 1-13, Comparative Application Examples 1-4 Application Examples 1-13 and Comparative Application Examples 1-4 each provide a resin composition, the formulation of which is shown in Tables 3 and 4 by weight. The preparation method of the resin composition includes: mixing the components, then using a twin-screw extruder to knead the resin composition, extruding it to obtain a granular product, which is the resin composition. The filler needs to be fed separately from the side feed port. The extrusion temperature is 295°C.

[0119] Table 3 Table 4 Performance Evaluation (1) Evaluation method for chemical cracking resistance: The resin compositions provided in the application examples and comparative application examples were used in an injection molding machine to prepare 80mm×10mm×4.0mm specimens according to ISO 179 standard under molding conditions of 295°C barrel temperature and 50°C mold temperature. The specimens were bent to 2% strain and fixed in a bending fixture, and then completely immersed in 99% isopropanol solution for testing under constant temperature conditions of 40°C. The time when visible cracks appeared on the specimens was recorded.

[0120] (2) Evaluation method for precipitate content: The resin compositions provided in the application examples and comparative application examples were used in an injection molding machine to produce 10cm×5cm×1.2mm samples under molding conditions of 295℃ barrel temperature and 50℃ mold temperature. The surface brightness of the samples was tested using a high-precision spectrophotometer (Datacolor Spectro 1050). The result L obtained from 5 samples was calculated and the average value was recorded as L1. The samples were placed in a 95℃, 95% constant temperature and humidity chamber for 24h, and then placed at room temperature for 48h. The average value of the result L obtained from 5 samples was calculated again and recorded as L2. The precipitate content was evaluated by the change in surface brightness and recorded as ΔL, ΔL=L2. L1.

[0121] The specific test results are shown in Table 5.

[0122] Table 5 As shown in Table 5, the syndiotactic polystyrene resin provided by the present invention, by controlling the proportion of the component with a molecular weight ≤2000g / mol in the butanone soluble matter in the syndiotactic polystyrene resin to be in the range of 8~30%, enables the syndiotactic polystyrene composition to have both excellent chemical crack resistance and surface properties; the material including the syndiotactic polystyrene has an isopropanol crack resistance time ≥138min and a surface brightness change ΔL ≤3.6.

[0123] As can be seen from Application Example 1 and Comparative Application Examples 1-4, when the proportion of components with a molecular weight ≤2000g / mol in the soluble matter of methyl ethyl ketone is less than 8%, the product has poor resistance to chemical cracking; when it is greater than 30%, the content of precipitates under high temperature and high humidity conditions is relatively high, and the surface brightness changes significantly.

[0124] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A syndiotactic polystyrene resin, characterized in that, The syndiotactic polystyrene resin contains methyl ethyl ketone (MEK) solubles; the mass percentage of MEK solubles in the syndiotactic polystyrene resin is <5.8%; in the GPC spectrum of the MEK solubles, the percentage of the integrated area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol is 8~30% of the total integrated area.

2. The syndiotactic polystyrene resin according to claim 1, characterized in that, In the GPC spectrum of the butanone solubles, the percentage of the integrated area of ​​the response signal corresponding to the component with a molecular weight ≤2000 g / mol is 14.5~28.5% of the total integrated area.

3. The syndiotactic polystyrene resin according to claim 1, characterized in that, The mass percentage of butanone-soluble matter in the syndiotactic polystyrene resin is 0.6% to 4.5%.

4. A method for preparing syndiotactic polystyrene resin according to any one of claims 1 to 3, characterized in that, The preparation method includes: subjecting styrene monomer to an addition polymerization reaction in the presence of a catalyst, an inert solvent, and a nitrogen-hydrogen mixture to obtain a polymerization product; and post-treating the polymerization product to obtain the syndiotactic polystyrene resin, wherein the catalyst comprises the following components: (A) Titanocene metal compounds; (B) Alkyl aluminum oxane b1, and / or compound b2 that can react with titanium metal compounds to form ionic complexes; And optionally (C) at least one aluminum compound; The inert solvent includes at least one of C3-C8 alkanes, C3-C8 cycloalkanes, and C6-C8 aromatics; The volume fraction of hydrogen in the nitrogen-hydrogen mixture is 0.2% to 15%. The post-processing method includes: performing a first devolatilization on the polymer product within a temperature range from its glass transition temperature to its melting point to obtain a first devolatilization product; placing the first devolatilization product in an extruder and performing a second devolatilization on it within a temperature range from its melting point to 350°C and under a pressure ≤30kPa.

5. The preparation method according to claim 4, characterized in that, The catalyst satisfies at least one of (1) to (4): (1) The general formula of the component (A) is R 1 TiX 1 X 2 X 3 ; Among them, R 1 Selected from any one of substituted or unsubstituted cyclopentadienyl, substituted or unsubstituted indenyl, or fused polycyclic cyclopentadienyl containing at least one saturated ring; X 1 X 2 and X 3 Each of the substituents is independently selected from any one of hydrogen atoms, halogen atoms, C1-C12 alkyl, C1-C12 alkoxy, C1-C12 alkylsilyl, C6-C20 aryl, C6-C20 aryloxy, C6-C20 arylsilyl, and C7-C20 arylalkyl; the substituents include halogen atoms, C1-C12 alkyl, C1-C12 alkoxy, C6-C20 aryl, C6-C20 aryloxy, and C7-C20 arylalkyl, and when the number of substituents is greater than 1, the substituents may be the same or different; (2) The alkylaluminoxane b1 is selected from C1~C8 straight-chain alkylaluminoxanes; (3) The general formula of compound b2 is [R 2 3C] + [MX 4 q ] - ; Among them, R 2 Selected from at least one of alkyl groups with ≥1 carbon atom and aryl groups with ≥6 carbon atom, R 2 Same or different; M is selected from at least one of B, Al, Si, P, and As; X 4 The group is selected from at least one of C1-C12 alkyl, C1-C12 alkoxy, C6-C20 aryl, C6-C20 aryloxy, C7-C20 aralkyl, and C6-C20 haloaryl, where q is an integer from 2 to 8, and X 4 Same or different; (4) The general formula of the component (C) is R 3 p AlH 3-p ; Among them, R 3 Selected from C1~C8 alkyl groups, where 0≤p≤3 and p>1, R 3 Same or different.

6. The preparation method according to claim 4, characterized in that, The catalyst satisfies at least one of (1) to (4): (1) The molar ratio of aluminum to the titanoceramic metal compound in the alkylaluminoxane b1 is (10~1000):1; (2) The molar ratio of M to the titanium metal compound in compound b2 is (0.5~10):1; (3) The molar ratio of aluminum to titanium metal compound in component (C) is (10~1000):1; (4) The concentration of the titanium chromium compound relative to styrene is 1 × 10⁻⁶. -7 ~5×10 -4 mol / L.

7. The preparation method according to claim 4, characterized in that, The preparation method satisfies at least one of (1) to (4): (1) The inert solvent includes at least one of n-hexane, n-pentane, cyclopentane or toluene; (2) The temperature of the addition polymerization reaction is 75℃~100℃; (3) The pressure of the addition polymerization reaction is 0 MPa to 10 MPa; (4) The preparation method includes: continuously feeding styrene and catalyst into a reactor in the presence of a nitrogen-hydrogen mixture, while simultaneously feeding an inert solvent into the reactor to carry out an addition polymerization reaction.

8. A resin composition, characterized in that, The resin composition comprises the syndiotactic polystyrene resin as described in any one of claims 1 to 3, and further comprises at least one of fillers, a second resin, a compatibilizer, and other additives.

9. The resin composition according to claim 8, characterized in that, The resin composition comprises, by weight, 20-100 parts of syndiotactic polystyrene resin, 0.5-50 parts of filler, 3-60 parts of secondary resin, 0.1-10 parts of compatibilizer, and 0-20 parts of other additives.

10. The resin composition according to claim 9, characterized in that, The resin composition satisfies at least one of (1) to (4): (1) The packing material includes at least one of fibrous packing material, granular packing material, and powdered packing material; (2) The second resin includes polyamide; (3) The compatibilizer includes modified styrene polymers and / or modified polyphenylene ether polymers; (4) The other additives include at least one of rubber elastomers, antioxidants, lubricants, crosslinking agents, crosslinking aids, nucleating agents, plasticizers, flame retardants, colorants, and antistatic agents.

11. The resin composition according to claim 10, characterized in that, The resin composition satisfies at least one of (1) to (6): (1) The fibrous filler includes at least one of glass fiber, carbon fiber, whisker, ceramic fiber, and metal fiber; (2) The granular filler and powdered filler are each independently selected from at least one of talc, carbon black, graphite, titanium dioxide, silicon dioxide, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, tin oxide, aluminum oxide, kaolin, silicon carbide, metal powder, glass powder, glass flakes, and glass microspheres; (3) The polyamide includes at least one of polycaprolactam, polyhexamethylene adipamide, polyundecanoamide, polydodecanoamide, polyhexamethylene diamine sebacate, polyhexamethylene diamine dodecanoic acid amide, polydecanoic acid amide, polydodecanoic acid amide, polyhexamethylene diamine terephthalamide, polynonadiamine terephthalamide, and polydecanoic acid terephthalamide; (4) The modified styrene polymers include at least one of the following: styrene-maleic anhydride copolymer, styrene-glycidyl methacrylate copolymer, terminal carboxylic acid modified polystyrene, terminal epoxy modified polystyrene, terminal oxazoline modified polystyrene, terminal amine modified polystyrene, sulfonated polystyrene, styrene ionomer, styrene-methyl methacrylate copolymer, styrene-glycidyl methacrylate-methyl methacrylate terpolymer, acrylate-styrene copolymer, styrene-b-glycidyl methacrylate-b-styrene, polybutylene terephthalate-g-polystyrene, maleic anhydride modified syndiotactic polystyrene, fumaric acid modified syndiotactic polystyrene, glycidyl methacrylate modified syndiotactic polystyrene, and amine modified syndiotactic polystyrene. (5) The modified polyphenylene ether polymer includes at least one selected from styrene-maleic anhydride-polyphenylene ether-graft polymer, maleic anhydride modified polyphenylene ether, fumaric acid modified polyphenylene ether, glycidyl methacrylate modified polyphenylene ether, and amine modified polyphenylene ether. (6) The polyphenylene ether in the modified polyphenylene ether polymer includes poly(2,6-dimethyl-1,4-phenylene ether), poly(2,3-dimethyl-6-ethyl-1,4-phenylene ether), poly(2-methyl-6-chloromethyl-1,4-phenylene ether), poly(2-methyl-6-hydroxyethyl-1,4-phenylene ether), poly(2-methyl-6-n-butyl-1,4-phenylene ether), poly(2-ethyl-6-isopropyl-1,4-phenylene ether), poly(2-ethyl-6-n-propyl-1,4-phenylene ether), poly(2,3,6-trimethyl-1,4-phenylene ether), poly[2-(4′-methylphenyl)-1,4-phenylene ether], poly(2-bromo-6-phenyl-1,4-phenylene ether), poly(2-methyl-6-ethyl ... At least one of the following: 1,4-phenylene ether, poly(2-phenyl-1,4-phenylene ether), poly(2-chloro-1,4-phenylene ether), poly(2-methyl-1,4-phenylene ether), poly(2-chloro-6-ethyl-1,4-phenylene ether), poly(2-chloro-6-bromo-1,4-phenylene ether), poly(2,6-dipropyl-1,4-phenylene ether), poly(2-methyl-6-isopropyl-1,4-phenylene ether), poly(2-chloro-6-methyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2,6-dibromo-1,4-phenylene ether), poly(2,6-dichloro-1,4-phenylene ether), and poly(2,6-diethyl-1,4-phenylene ether).

12. The resin composition according to claim 11, characterized in that, The glass fiber has a length of 0.05mm to 50mm and a diameter of 5μm to 20μm.

13. An article characterized in that, The article comprises the syndiotactic polystyrene resin according to any one of claims 1 to 3 or the resin composition according to any one of claims 8 to 12.

14. The use of a syndiotactic polystyrene resin as described in any one of claims 1 to 3 or a resin composition as described in any one of claims 8 to 12 in the preparation of household goods, electronic components, household appliances, gardening equipment, medical technology equipment, and motor vehicle parts.

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