A heat-resistant flame-retardant modified ppe sheet and a preparation method thereof

Abstract

The application discloses a heat-resistant and flame-retardant modified PPE sheet and a preparation method thereof, and relates to the field of polyphenylene ether-based composite materials. The preparation raw material of the heat-resistant and flame-retardant modified PPE sheet comprises 100 parts by weight of polyphenylene ether resin, 15-20 parts by weight of HIPS resin, 5.4-6.8 parts by weight of styrene-glycidyl methacrylate, 10-20 parts by weight of organic silicon modified elastomer, 25-30 parts by weight of flame retardant and 1.5-2.5 parts by weight of silicone master batch. The flame retardant comprises a silane coupling agent modified inorganic flame retardant and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate with a weight ratio of (1-3):1. The PPE sheet has the advantages of heat resistance, flame retardancy and impact resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of polyphenyl ether-based composite materials, in particular to a heat-resistant flame-retardant modified PPE sheet and a preparation method thereof. BACKGROUND

[0002] As a high-performance engineering plastic, polyphenyl ether (PPE) has been widely used in the fields of electronics and electrical appliances, automobile industry, etc. due to its excellent heat resistance, chemical resistance and mechanical properties.

[0003] Among them, adding a flame retardant to polyphenyl ether can enhance the flame retardant properties of polyphenyl ether. Inorganic flame retardants are commonly used because of their low cost and no harmful gas. However, the use of inorganic flame retardants in large quantities can significantly reduce the impact resistance of polyphenyl ether. The addition of elastomers can improve the impact resistance of polyphenyl ether, but the addition of elastomers can reduce the heat resistance of polyphenyl ether. Therefore, how to obtain a polyphenyl ether with heat resistance, flame retardancy and impact resistance is an important research direction. SUMMARY

[0004] In order to improve the problem that it is difficult to obtain a polyphenyl ether material with heat resistance, flame retardancy and impact resistance, the present application provides a heat-resistant flame-retardant modified PPE sheet and a preparation method thereof.

[0005] In a first aspect, the heat-resistant flame-retardant modified PPE sheet provided by the present application adopts the following technical scheme:

[0006] A heat-resistant flame-retardant modified PPE sheet, the preparation raw materials of the heat-resistant flame-retardant modified PPE sheet include 100 parts by weight of polyphenyl ether resin, 15-20 parts by weight of HIPS resin, 5.4-6.8 parts by weight of styrene-glycidyl methacrylate, 10-20 parts by weight of silicone-modified elastomer, 25-30 parts by weight of flame retardant, and 1.5-2.5 parts by weight of silicone master batch; the flame retardant includes silane coupling agent modified inorganic flame retardant and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate in a weight ratio of (1-3):1.

[0007] In the present application, the heat-resistant flame-retardant modified PPE sheet is prepared from polyphenyl ether resin, HIPS resin, styrene-glycidyl methacrylate, silicone-modified elastomer, silane coupling agent modified inorganic flame retardant, dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and silicone master batch in a specific ratio, which has the advantages of heat resistance, flame retardancy and impact resistance.

[0008] The silane coupling agent modified inorganic flame retardant and the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate are combined in a specific ratio, which can reduce the amount of inorganic flame retardant and improve the flame retardancy of polyphenyl ether. In order to improve the impact resistance of the polyphenyl ether, the organic silicon modified elastomer is added, which can improve the toughness and heat resistance of the polyphenyl ether, and is beneficial to improve the flame retardancy, heat resistance and impact resistance of the polyphenyl ether sheet.

[0009] In addition, the styrene-glycidyl methacrylate and the silicone master batch are introduced to improve the dispersion of the polyphenyl ether, the styrene-glycidyl methacrylate can react with the active groups on the polyphenyl ether, the silane coupling agent modified inorganic flame retardant and the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate, which can improve the compatibility of the silane coupling agent modified inorganic flame retardant, the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and the polyphenyl ether, the silicone master batch has good melt flowability at high temperature, which can improve the melt viscosity and the processing performance, and indirectly promote the dispersion, so that the polyphenyl ether sheet with stable performance is obtained.

[0010] In some preferred embodiments, the organic silicon modified elastomer is prepared by reacting the epoxy group in the glycidyl methacrylate grafted SEBS elastomer with the hydroxyl group in the end-vinyl end-hydroxyl polydimethylsiloxane, and then reacting with the side hydrogen-containing silicone oil by silicon hydrogen addition reaction, wherein the weight ratio of the end-vinyl end-hydroxyl polydimethylsiloxane, the glycidyl methacrylate grafted SEBS elastomer and the side hydrogen-containing silicone oil is (4.5-5.2):10:(5.5-6.5).

[0011] In the present application, the organic silicon modified elastomer is prepared by reacting the end-vinyl end-hydroxyl polydimethylsiloxane, the glycidyl methacrylate grafted SEBS elastomer and the side hydrogen-containing silicone oil in a specific ratio, which has good toughness and heat resistance, and can be uniformly dispersed in the polyphenyl ether resin, which is beneficial to further improve the flame retardancy, heat resistance and impact resistance of the polyphenyl ether sheet.

[0012] In some specific embodiments, the grafting rate of the glycidyl methacrylate in the glycidyl methacrylate grafted SEBS elastomer is 5.5-6.5wt%.

[0013] In some specific embodiments, the melt index of the glycidyl methacrylate grafted SEBS elastomer is 15-20g / 10min(230℃ / 5kg).

[0014] In some specific embodiments, the end-vinyl end-hydroxyl polydimethylsiloxane has a degree of polymerization of 15-20.

[0015] In some specific embodiments, the side hydrogen-containing silicone oil has a structure as follows: (CH3)3Si[O(CH3)2Si]m[O(H)(CH3)Si]OSi(CH3)3; wherein m is 15-20.

[0016] In the present application, by controlling the grafting rate and melt index of the glycidyl methacrylate grafted SEBS elastomer, the degree of polymerization of the dimethylsiloxane segment in the end-vinyl end-hydroxyl polydimethylsiloxane, and the degree of polymerization of the dimethylsiloxane segment in the side hydrogen-containing silicone oil, the heat resistance of the polyphenylene ether sheet is further improved, and the uniform dispersion of the silicone-modified elastomer in the polyphenylene ether is further improved, which is beneficial to further improve the impact resistance of the polyphenylene ether sheet.

[0017] In some specific embodiments, the preparation method of the silicone-modified elastomer comprises the following steps: adding end-vinyl end-hydroxyl polydimethylsiloxane into glycidyl methacrylate grafted SEBS elastomer according to the proportion, then adding tertiary amine catalyst, heating to 80-100℃, and then adding side hydrogen-containing silicone oil and platinum catalyst for silicon-hydrogen addition reaction, and finally extruding and granulating to obtain silicone-modified elastomer.

[0018] In some specific embodiments, the mass percentage of glycidyl methacrylate in the styrene-glycidyl methacrylate is 5.5-8.2%.

[0019] In the present application, the mass percentage of glycidyl methacrylate in the styrene-glycidyl methacrylate is 5.5-8.2%, which is beneficial to further promote the uniform dispersion of each raw material.

[0020] In some preferred embodiments, the weight ratio of the silane coupling agent modified inorganic flame retardant and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate is (1.5-2):1.

[0021] In the present application, the weight ratio of the silane coupling agent modified inorganic flame retardant and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate is controlled to be (1.5-2):1, which is beneficial to further improve the flame retardant performance of the polyphenylene ether sheet.

[0022] In some specific embodiments, the silane coupling agent modified inorganic flame retardant is an amino silane coupling agent modified inorganic flame retardant.

[0023] In the present application, the inorganic flame retardant modified by the silane coupling agent is the inorganic flame retardant modified by the amino silane coupling agent, which is conducive to promoting the uniform dispersion of the inorganic flame retardant in the polyphenyl ether.

[0024] In some specific embodiments, the amino silane coupling agent modified inorganic flame retardant is at least one of the magnesium hydroxide modified by the amino silane coupling agent and the aluminum hydroxide modified by the amino silane coupling agent.

[0025] In the second aspect, the present application provides a preparation method of a heat-resistant and flame-retardant modified PPE sheet, which adopts the following technical scheme:

[0026] A preparation method of a heat-resistant and flame-retardant modified PPE sheet, comprising the following steps:

[0027] The polyphenyl ether resin, the HIPS resin, the styrene-glycidyl methacrylate, the organic silicon modified elastomer, the silane coupling agent modified inorganic flame retardant, the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and the silicone master batch are uniformly melt-mixed at 275-285℃, and then extruded, granulated to obtain the modified polyphenyl ether master batch.

[0028] The modified polyphenyl ether master batch is extruded after being melted at 275-285℃, and is calendered to obtain the heat-resistant and flame-retardant modified PPE sheet.

[0029] In the present application, by matching the raw materials, the above-mentioned simple and convenient process can be used when preparing the polyphenyl ether sheet, and meanwhile, the raw materials can be uniformly dispersed in the range of 275-285℃, which is conducive to obtaining the polyphenyl ether sheet with stable performance.

[0030] In summary, the present application at least includes the following beneficial technical effects:

[0031] (1) In the present application, the heat-resistant and flame-retardant modified PPE sheet is prepared from the polyphenyl ether resin, the HIPS resin, the styrene-glycidyl methacrylate, the organic silicon modified elastomer, the silane coupling agent modified inorganic flame retardant, the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and the silicone master batch with a specific ratio, which has the advantages of heat resistance, flame retardancy and impact resistance.

[0032] (2) In the present application, the organic silicon modified elastomer is prepared from the end-vinyl end-hydroxyl polydimethylsiloxane, the glycidyl methacrylate grafted SEBS elastomer and the side hydrogen-containing silicone oil with a specific ratio, which has the advantages of toughness and better heat resistance, and can be uniformly dispersed in the polyphenyl ether resin, which is conducive to further improving the flame retardant performance, heat resistance and impact resistance of the polyphenyl ether sheet. DETAILED DESCRIPTION

[0033] The present application is further illustrated by the following specific experiments.

[0034] Preparation Example

[0035] Preparation Example 1

[0036] An organic silicon modified elastomer comprises the following raw materials:

[0037] Glycidyl methacrylate grafted SEBS elastomer: 10 kg; wherein the grafting rate of glycidyl methacrylate is 5.5 wt%, and the melt index of the glycidyl methacrylate grafted SEBS elastomer is 18 g / 10 min (230℃ / 5 kg); end-vinyl end-hydroxyl polydimethylsiloxane: 4.5 kg; wherein the degree of polymerization of the dimethylsiloxane segment in the end-vinyl end-hydroxyl polydimethylsiloxane is 15;

[0038] Tertiary amine catalyst: 0.01 kg; wherein the tertiary amine catalyst is bisdimethylaminoethyl ether.

[0039] In this preparation example, the preparation method of the organic silicon modified elastomer is as follows:

[0040] The end-vinyl end-hydroxyl polydimethylsiloxane is added to the glycidyl methacrylate grafted SEBS elastomer according to the proportion, then the tertiary amine catalyst is added, the temperature is raised to 90℃ and reacted for 20 min, then extruded and granulated to obtain the organic silicon modified elastomer.

[0041] Preparation Example 2

[0042] An organic silicon modified elastomer comprises the following raw materials:

[0043] Glycidyl methacrylate grafted SEBS elastomer: 10 kg; wherein the grafting rate of glycidyl methacrylate is 5.5 wt%, and the melt index of the glycidyl methacrylate grafted SEBS elastomer is 18 g / 10 min (230℃ / 5 kg); end-vinyl end-hydroxyl polydimethylsiloxane: 4.5 kg; wherein the degree of polymerization of the dimethylsiloxane segment in the end-vinyl end-hydroxyl polydimethylsiloxane is 15;

[0044] Tertiary amine catalyst: 0.01 kg; wherein the tertiary amine catalyst is bisdimethylaminoethyl ether;

[0045] Double-end hydrogen polydimethylsiloxane: 5.5 kg; wherein the degree of polymerization of the dimethylsiloxane segment in the double-end hydrogen polydimethylsiloxane is 15;

[0046] Platinum catalyst: 0.001 kg.

[0047] In this preparation example, the preparation method of the organic silicon modified elastomer is as follows:

[0048] The end-vinyl end-hydroxyl polydimethylsiloxane is added into the glycidyl methacrylate grafted SEBS elastomer according to the proportion, then the tertiary amine catalyst is added, the temperature is increased to 90℃, and reacted for 20 min, then the side hydrogen-containing silicone oil and the platinum catalyst are added, and the reaction is continued for 20 min, and finally the extrusion granulation is carried out to obtain the silicone modified elastomer.

[0049] Preparation Example 3

[0050] A silicone modified elastomer comprises the following raw materials:

[0051] The glycidyl methacrylate grafted SEBS elastomer is 10 kg, wherein the grafting rate of glycidyl methacrylate is 5.5wt%, and the melt index of the glycidyl methacrylate grafted SEBS elastomer is 18g / 10min(230℃ / 5kg); the end-vinyl end-hydroxyl polydimethylsiloxane is 4.5kg; wherein the polymerization degree of dimethylsiloxane segment in the end-vinyl end-hydroxyl polydimethylsiloxane is 15;

[0052] The tertiary amine catalyst is 0.01kg; wherein the tertiary amine catalyst adopts bisdimethylaminoethyl ether;

[0053] The side hydrogen-containing silicone oil is 5.5kg; wherein the structure formula of the side hydrogen-containing silicone oil is (CH3)3Si[O(CH3)2Si]m[O(H)(CH3)Si]OSi(CH3)3, and the value of m is 15;

[0054] The platinum catalyst is 0.001kg.

[0055] In the preparation example, the preparation method of the silicone modified elastomer is as follows:

[0056] The end-vinyl end-hydroxyl polydimethylsiloxane is added into the glycidyl methacrylate grafted SEBS elastomer according to the proportion, then the tertiary amine catalyst is added, the temperature is increased to 90℃, and reacted for 20 min, then the side hydrogen-containing silicone oil and the platinum catalyst are added, and the reaction is continued for 20 min, and finally the extrusion granulation is carried out to obtain the silicone modified elastomer.

[0057] Preparation Example 4

[0058] A silicone modified elastomer, which is different from the preparation example 3 in that the raw materials and the proportions are different. In the preparation example, the raw materials used are as follows:

[0059] Glycidyl methacrylate grafted SEBS elastomer: 10 kg; wherein the grafting rate of glycidyl methacrylate is 5.5 wt%, and the melt index of the glycidyl methacrylate grafted SEBS elastomer is 18 g / 10 min (230°C / 5 kg); end-vinyl end-hydroxyl polydimethylsiloxane: 5.2 kg; wherein the degree of polymerization of the dimethylsiloxane segment in the end-vinyl end-hydroxyl polydimethylsiloxane is 20;

[0060] Tertiary amine catalyst: 0.01 kg; wherein the tertiary amine catalyst is bisdimethylaminoethyl ether;

[0061] Side hydrogen-containing silicone oil: 6.5 kg; wherein the structure of the side hydrogen-containing silicone oil is as follows: (CH3)3Si[O(CH3)2Si]m[O(H)(CH3)Si]OSi(CH3)3, and m is 20;

[0062] Platinum catalyst: 0.001 kg.

[0063] Embodiment

[0064]

Embodiment 1

[0065] A heat-resistant flame-retardant modified PPE sheet includes the following raw materials:

[0066] Polyphenyl ether resin: 100 kg; wherein the polyphenyl ether resin adopts German Wanhua VESTORAN 1900GF20;

[0067] HIPS resin: 15 kg; wherein the HIPS resin adopts Taizhong HP825G;

[0068] Styrene-glycidyl methacrylate: 6.8 kg; wherein the mass fraction of glycidyl methacrylate in the styrene-glycidyl methacrylate is 5.5%, and the weight average molecular weight is 750-800 thousand;

[0069] Silicone modified elastomer: 10 kg; wherein the silicone modified elastomer adopts the silicone modified elastomer prepared in

Preparation Example 1

[0070] Flame retardant: 25 kg; wherein the flame retardant includes aluminum hydroxide modified by amino silane coupling agent KH550 and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate in a weight ratio of 1:1.

[0071] Silicone master batch: 1.5 kg.

[0072] In this embodiment, the preparation method of the heat-resistant flame-retardant modified PPE sheet includes the following steps:

[0073] The polyphenyl ether resin, styrene-glycidyl methacrylate, silicone modified elastomer, silane coupling agent modified inorganic flame retardant, dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and silicone master batch are uniformly melt mixed at 275℃, then extruded, granulated to obtain the modified polyphenyl ether master batch;

[0074] The modified polyphenyl ether master batch is extruded after being melted at 275℃, calendered, cooled to obtain the heat-resistant flame-retardant modified PPE sheet.

[0075]

Example 2

[0076] A heat-resistant flame-retardant modified PPE sheet comprises the following raw materials:

[0077] Polyphenyl ether resin: 100 kg; wherein the polyphenyl ether resin adopts German Wanhao VESTORAN 1900GF20;

[0078] HIPS resin: 20 kg; wherein the HIPS resin adopts Taiwanhua HP825G;

[0079] Styrene-glycidyl methacrylate: 5.4 kg; wherein the mass ratio of glycidyl methacrylate in the styrene-glycidyl methacrylate is 8.2%, and the weight average molecular weight is 60-65 thousand.

[0080] Silicone modified elastomer: 20 kg; wherein the silicone modified elastomer adopts the silicone modified elastomer prepared in

Preparation Example 1

[0081] Flame retardant: 30 kg; wherein the flame retardant comprises aluminum hydroxide modified by amino silane coupling agent KH550 and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate with a weight ratio of 3:1.

[0082] Silicone master batch: 2.5 kg.

[0083] In this embodiment, the preparation method of the heat-resistant flame-retardant modified PPE sheet comprises the following steps:

[0084] The polyphenyl ether resin, styrene-glycidyl methacrylate, silicone modified elastomer, silane coupling agent modified inorganic flame retardant, dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and silicone master batch are uniformly melt mixed at 285℃, then extruded, granulated to obtain the modified polyphenyl ether master batch;

[0085] The modified polyphenyl ether master batch is extruded after being melted at 285℃, calendered, cooled to obtain the heat-resistant flame-retardant modified PPE sheet.

[0086]

Example 3

[0087] A heat resistant flame retardant modified PPE sheet, which differs from

Example 1

Preparation Example 2

[0088]

Example 4

[0089] A heat resistant flame retardant modified PPE sheet, which differs from

Example 1

Preparation Example 3

[0090]

Example 5

[0091] A heat resistant flame retardant modified PPE sheet, which differs from

Example 1

Preparation Example 4

[0092] Comparative Example

[0093]

Comparative Example 1

[0094] A PPE sheet, which differs from

Example 1

[0095]

Comparative Example 2

[0096] A PPE sheet, which differs from

Example 1

[0097]

Comparative Example 3

[0098] A PPE sheet, which differs from

Example 1

[0099] Performance test test

[0100] 1. Limiting Oxygen Index (LOI) test: tested according to ISO 4589-2, wherein a limiting oxygen index greater than 30% is qualified.

[0101] 2. Heat Deflection Temperature (HDT) test: tested according to ISO 75-2 / B, under the condition of 0.45 MPa, unannealed, wherein a heat deflection temperature greater than 190°C is qualified.

[0102] 3. Charpy Notched Impact Strength: tested according to ISO 179 / 1eA, under the condition of 0°C, complete fracture, wherein a charpy notched impact strength greater than 12 KJ / m 2Pass.

[0103] Table 1

[0104]

[0105]

[0106] From the data in Example 1 and Comparative Example 1 and Table 1, it can be seen that when the styrene-glycidyl methacrylate in the PPE sheet is replaced by equal mass of polyphenylene ether resin, the limiting oxygen index, heat distortion temperature and notched impact strength of the PPE sheet all decrease, indicating that the flame retardant properties, heat resistance and impact resistance of the PPE sheet all decrease. Among them, the styrene-glycidyl methacrylate plays a key role in improving the uniform dispersibility of raw materials such as flame retardants in the polyphenylene ether resin, and the dispersibility of the raw materials directly affects the various properties of the PPE sheet.

[0107] From the data in Example 1 and Comparative Example 2 and Table 1, it can be seen that when the silicone-modified elastomer in the PPE sheet is replaced by equal mass of glycidyl methacrylate-grafted SEBS elastomer, the limiting oxygen index and heat distortion temperature of the PPE sheet both decrease significantly, because the glycidyl methacrylate-grafted SEBS elastomer is not modified by silicone, and has poor flame retardant properties and heat resistance.

[0108] From the data in Example 1 and Comparative Example 3 and Table 1, it can be seen that when the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate in the PPE sheet is replaced by a combination of (2-diethylphosphonoethyl)methyldiethoxysilane and ammonium polyphosphate, the flame retardant properties of the PPE sheet decrease significantly, indicating that the dihydroxy-methyl-ethyl silane-dimethoxy phosphonate and the silane coupling agent-modified inorganic flame retardant together as a flame retardant can achieve a more optimal flame retardant effect.

[0109] From the data in Example 1 and Example 3 and Table 1, it can be seen that when preparing the silicone-modified elastomer, increasing the silicon-hydrogen addition reaction step can further improve the uniform dispersibility of the silicone-modified elastomer in the polyphenylene ether resin, which is beneficial to further improving the flame retardant properties, heat resistance and impact resistance of the PPE sheet.

[0110] From the data in Example 3 and Example 4 and Table 1, it can be seen that when preparing the silicone-modified elastomer, using a side hydrogen-containing silicone oil for silicon-hydrogen addition reaction is beneficial to further improving the uniform dispersibility of the silicone-modified elastomer in the polyphenylene ether resin, which can further improve the flame retardant properties, heat resistance and impact resistance of the PPE sheet.

[0111] The specific embodiments are only illustrative of the application, and are not intended to limit the application. Any modifications made by those skilled in the art without creative contribution to the application, as long as they are within the scope of the claims of the application, are protected by the patent law.

Claims

1. A heat resistant flame-retardant modified PPE sheet, characterized by: The raw materials for preparing the heat-resistant flame-retardant modified PPE sheet include 100 parts by weight of polyphenylene ether resin, 15-20 parts by weight of HIPS resin, 5.4-6.8 parts by weight of styrene-glycidyl methacrylate, 10-20 parts by weight of silicone-modified elastomer, 25-30 parts by weight of flame retardant, and 1.5-2.5 parts by weight of silicone masterbatch; the flame retardant includes silane coupling agent modified inorganic flame retardant and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate in a weight ratio of (1-3):1; The silicone-modified elastomer is prepared by reacting the epoxy groups in the glycidyl methacrylate grafted SEBS elastomer with the hydroxyl groups in the end-vinyl end-hydroxyl polydimethylsiloxane, and then by silane hydrogen addition reaction with the side hydrogen-containing silicone oil, wherein the weight ratio of the end-vinyl end-hydroxyl polydimethylsiloxane, the glycidyl methacrylate grafted SEBS elastomer, and the side hydrogen-containing silicone oil is (4.5-5.2):10:(5.5-6.5).

2. A heat resistant flame retardant modified PPE sheet as claimed in claim 1, wherein: The grafting rate of the glycidyl methacrylate in the glycidyl methacrylate grafted SEBS elastomer is 5.5-6.5 wt%.

3. A heat resistant flame retardant modified PPE sheet as claimed in claim 1, wherein: The melt index of the glycidyl methacrylate grafted SEBS elastomer is 15-20 g / 10 min at 230℃ / 5 kg.

4. A heat resistant flame retardant modified PPE sheet as claimed in claim 1, wherein: The polymerization degree of the dimethylsiloxane segment in the end-vinyl end-hydroxyl polydimethylsiloxane is 15-20.

5. A heat resistant flame retardant modified PPE sheet as claimed in any one of claims 1 to 4, wherein, The side hydrogen-containing silicone oil has a structural formula as follows: (CH3)3Si[O(CH3)2Si] m [O(H)(CH3)Si]OSi(CH3)3; wherein m is 15-20.

6. A heat resistant flame retardant modified PPE sheet as claimed in claim 1, wherein: The mass fraction of the glycidyl methacrylate in the styrene-glycidyl methacrylate is 5.5-8.2%.

7. A heat resistant flame retardant modified PPE sheet as claimed in claim 1, wherein: The weight ratio of the silane coupling agent modified inorganic flame retardant and dihydroxy-methyl-ethyl silane-dimethoxy phosphonate is (1.5-2):

1.

8. A heat resistant flame retardant modified PPE sheet as claimed in claim 1, wherein: The silane coupling agent modified inorganic flame retardant is an amino silane coupling agent modified inorganic flame retardant.

9. A process for the preparation of a heat resistant flame retardant modified PPE sheet as claimed in any one of claims 1 to 8, characterized by, The method comprises the following steps: The polyphenylene ether resin, HIPS resin, styrene-glycidyl methacrylate, silicone-modified elastomer, silane coupling agent modified inorganic flame retardant, dihydroxy-methyl-ethyl silane-dimethoxy phosphonate, and silicone masterbatch are uniformly melt mixed at 275-285℃, then extruded, granulated, to obtain modified polyphenylene ether masterbatch; the modified polyphenylene ether masterbatch is extruded after being melted at 275-285℃, calendered, cooled, to obtain the heat-resistant flame-retardant modified PPE sheet.

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