High-hydrolysis-resistance glass fiber reinforced polyester material

Abstract

The invention discloses a high-hydrolysis-resistance glass fiber reinforced polyester material, which is prepared from the following raw materials in parts by weight: 36 to 65 parts of mixed modified polyester resin, 9 to 25 parts of glass fiber, 6 to 11 parts of hydrolysis-resistant agent, 4 to 15 parts of toughening agent, 2 to 8 parts of buffering agent, 0.2 to 0.5 part of compatilizer, 0.1 to 1.0 part of lubricating agent and 3 to 10 parts of halogen-free flame retardant, the modified polyester resin comprises organic silicon modified polyester resin and acrylate modified polyester resin. The modified mixed polyester resin material is used as the raw material of the polyester material, so that the polyester material can fully combine the advantages of the organic silicon modified polyester resin and the polyacrylate modified polyester resin, and terminal carboxyl groups in a polyester molecular chain are reduced by using the mixed modified polyester resin, so that the hydrolysis reaction is inhibited, and the service life of the polyester material is prolonged. Therefore, the hydrolysis resistance of the polyester material is improved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a highly hydrolysis-resistant glass fiber reinforced polyester material. Background Art

[0002] Polyester materials are products made from polyester resins with different functional additives added. Polyester resins are a general term for polymer compounds formed by the polycondensation of diols, dibasic acids, or polyols and polyacids. They are widely used in packaging, electronics, medical and health, construction, automobiles and other fields.

[0003] Traditional polyester materials generally have a disadvantage that they are easily hydrolyzed, which leads to a significant reduction in the service life of products made of polyester and a significant reduction in the overall performance of the products.

[0004] The defects of existing polymer materials are:

[0005] 1. Patent document CN102702699A discloses a glass fiber reinforced hydrolysis-resistant polyester material. However, the polyester material in the patent document only considers consuming the terminal carboxyl groups in the polyester by using carbodiimide anti-hydrolysis agents or values ​​containing epoxy groups, and does not consider modifying the polyester resin to reduce the terminal carboxyl groups in the polyester resin to improve the hydrolysis resistance of the polyester material;

[0006] 2. When the polyester material uses polyethylene terephthalate, i.e. PET, as the raw material, the notched impact strength of the polyester product is low, making it easy to break;

[0007] 3. Application document CN116200016A discloses a glass fiber reinforced polyester material capable of laser welding and a preparation method thereof. However, no lubricant is added to the polyester material in the document when glass fiber is added, which may cause the glossiness of the polyester product to decrease and the surface to become rough. Summary of the invention

[0008] The object of the present invention is to provide a highly hydrolysis-resistant glass fiber reinforced polyester material to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solution: a highly hydrolysis-resistant glass fiber reinforced polyester material, the polyester material comprising the following raw materials in parts by weight: 36 to 65 parts of a mixed modified polyester resin, 9 to 25 parts of glass fiber, 6 to 11 parts of an anti-hydrolysis agent, 4 to 15 parts of a toughening agent, 2 to 8 parts of a buffer, 0.2 to 0.5 parts of a compatibilizer, 0.1 to 1.0 parts of a lubricant and 3 to 10 parts of a halogen-free flame retardant;

[0010] The modified polyester resin comprises an organosilicon-modified polyester resin and an acrylate-modified polyester resin, and the weight ratio of the organosilicon-modified polyester resin to the acrylate-modified polyester resin is (4-7):(3-5).

[0011] Preferably, the modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 0.6 dl / g to 1.8 dl / g.

[0012] Preferably, the glass fiber is an alkali-free untwisted chopped glass fiber with a diameter of 8 μm to 16 μm and treated with a silane coupling agent, and the chopped length of the glass fiber is 4 mm to 4.8 mm.

[0013] Preferably, the anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is (12-14): (1.1-1.5).

[0014] Preferably, the toughening agent is ethylene-butyl methacrylate-glycidyl acrylate copolymer or maleic anhydride grafted polypropylene.

[0015] Preferably, the buffer comprises an amphoteric compound and a melt stabilizer in a mass ratio of (1.8-2.5):(1.1-1.4), the amphoteric compound is stearate, and the melt stabilizer is hydrotalcite.

[0016] Preferably, the compatibilizer is a mixture of any one or more of glycidyl methacrylate grafted ethylene-octene copolymer, ethylene-methyl acrylate-glyceryl methacrylate and styrene-acrylonitrile-glycidyl methacrylate.

[0017] Preferably, the lubricant is one or more of silicone powder, pentaerythritol stearate, erucic acid amide, and modified ethylene bis fatty acid amide, and the halogen-free flame retardant is antimony trioxide or antimony pentoxide.

[0018] Preferably, a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material comprises the following steps:

[0019] Step S1: weighing raw materials according to weight;

[0020] Step S2: mixing the modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 5 to 8 minutes to obtain a mixed material;

[0021] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0022] Preferably, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 1 to 2 minutes.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses a modified mixed polyester resin material as the raw material of the polyester material, so that the polyester material can fully combine the advantages of both silicone-modified polyester resin and polyacrylate-modified polyester resin. The terminal carboxyl groups in the polyester molecular chain are reduced by modifying the polyester resin. The presence of the terminal carboxyl groups makes the ester bond susceptible to corrosion by water or moisture. Therefore, by using a mixed modified polyester resin to reduce the terminal carboxyl groups in the polyester molecular chain, the hydrolysis reaction is inhibited, thereby improving the hydrolysis resistance of the polyester material.

[0025] 2. The polyester material of the present invention improves the hydrolysis resistance of the material by reducing the presence of terminal carboxyl groups in the polyester resin, which effectively solves the problem that the method of only adding carbodiimide and epoxy materials to ordinary flame-retardant polyester resin materials to improve the hydrolysis resistance has little effect on the flame retardant system. The buffer added in the present invention maintains the stability of the material by adjusting the pH value of the mixed raw materials, enhances the mechanical properties and durability of the material, and synergizes with the anti-hydrolysis agent to further stabilize and improve the hydrolysis resistance of the material.

[0026] 3. The polyester material of the present invention has excellent weather resistance, a simple preparation process, and no toxic or harmful gases are generated during the preparation process. The notched impact strength of the polyester material is improved by adding an appropriate amount of toughening agent and compatibilizer. The present invention greatly improves the mechanical properties and heat resistance of the polyester material by adding glass fiber. At the same time, the present invention also improves the fluidity and reduces the surface floating fibers by adding a lubricant, thereby effectively improving the problem of rough surface of the material. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present invention provides a highly hydrolysis-resistant glass fiber reinforced polyester material, which comprises the following raw materials in parts by weight: 36 to 65 parts of a mixed modified polyester resin, 9 to 25 parts of glass fibers, 6 to 11 parts of an anti-hydrolysis agent, 4 to 15 parts of a toughening agent, 2 to 8 parts of a buffer, 0.2 to 0.5 parts of a compatibilizer, 0.1 to 1.0 parts of a lubricant, and 3 to 10 parts of a halogen-free flame retardant;

[0029] The modified polyester resin includes silicone modified polyester resin and acrylate modified polyester resin, and the weight ratio of silicone modified polyester resin to acrylate modified polyester resin is (4-7): (3-5).

[0030] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 0.6 dl / g to 1.8 dl / g.

[0031] The glass fiber is an alkali-free, untwisted short-cut glass fiber with a diameter of 8 μm to 16 μm and treated with a silane coupling agent. The short-cut length of the glass fiber is 4 mm to 4.8 mm.

[0032] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is (12-14): (1.1-1.5).

[0033] The toughening agent is ethylene-butyl methacrylate-glycidyl acrylate copolymer or maleic anhydride grafted polypropylene.

[0034] The buffer comprises an amphoteric compound and a melt stabilizer, and the mass ratio is (1.8-2.5): (1.1-1.4). The amphoteric compound is stearate, and the melt stabilizer is hydrotalcite.

[0035] The compatibilizer is any one or more mixtures of glycidyl methacrylate grafted ethylene-octene copolymer, ethylene-methyl acrylate-glyceryl methacrylate and styrene-acrylonitrile-glycidyl methacrylate.

[0036] The lubricant is one or more of silicone powder, pentaerythritol stearate, erucic acid amide, and modified ethylene bis fatty acid amide, and the halogen-free flame retardant is antimony trioxide or antimony pentoxide.

[0037] The present invention provides a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, comprising the following steps:

[0038] Step S1: weighing raw materials according to weight;

[0039] Step S2: mixing the modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 5 to 8 minutes to obtain a mixed material;

[0040] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0041] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 1 to 2 minutes.

[0042] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0043] Embodiment 1:

[0044] The present embodiment provides a highly hydrolysis-resistant glass fiber reinforced polyester material. The present embodiment provides a highly hydrolysis-resistant glass fiber reinforced polyester material. The polyester material comprises the following raw materials in parts by weight: 36 parts of mixed modified polyester resin, 9 parts of glass fiber, 6 parts of anti-hydrolysis agent, 4 parts of toughening agent, 2 parts of buffer, 0.2 parts of compatibilizer, 0.1 parts of lubricant and 3 parts of halogen-free flame retardant;

[0045] The modified polyester resin includes silicone modified polyester resin and acrylate modified polyester resin, and the weight ratio of the silicone modified polyester resin to the acrylate modified polyester resin is 4:3.

[0046] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 1.2 dl / g.

[0047] The glass fiber is an alkali-free, untwisted chopped glass fiber with a diameter of 10 μm and treated with a silane coupling agent. The chopped length of the glass fiber is 4 mm.

[0048] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is 12:1.1.

[0049] The toughening agent is ethylene-butyl methacrylate-glycidyl acrylate copolymer or.

[0050] The buffer comprises an amphoteric compound and a melt stabilizer, with a mass ratio of 1.8:1.1. The amphoteric compound is stearate and the melt stabilizer is hydrotalcite.

[0051] The compatibilizer is glycidyl methacrylate grafted ethylene-octene copolymer.

[0052] The lubricant is silicone powder and the halogen-free flame retardant is antimony trioxide.

[0053] A method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material provided by an embodiment of the present invention comprises the following steps:

[0054] Step S1: weighing raw materials according to weight;

[0055] Step S2: mixing the mixed modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 8 minutes to obtain a mixed material;

[0056] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0057] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 2 minutes.

[0058] Embodiment 2:

[0059] The present invention provides a highly hydrolysis-resistant glass fiber reinforced polyester material, which comprises the following raw materials in parts by weight: 45 parts of a mixed modified polyester resin, 13 parts of glass fiber, 8 parts of an anti-hydrolysis agent, 9 parts of a toughening agent, 4 parts of a buffer, 0.3 parts of a compatibilizer, 0.3 parts of a lubricant and 5 parts of a halogen-free flame retardant;

[0060] The modified polyester resin includes silicone modified polyester resin and acrylate modified polyester resin, and the weight ratio of the silicone modified polyester resin to the acrylate modified polyester resin is 5:4.

[0061] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 0.8 dl / g.

[0062] The glass fiber is an alkali-free, untwisted chopped glass fiber with a diameter of 12 μm and treated with a silane coupling agent. The chopped length of the glass fiber is 4.8 mm.

[0063] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is 12:1.3.

[0064] The toughening agent is ethylene-butyl methacrylate-glycidyl acrylate copolymer or maleic anhydride grafted polypropylene.

[0065] The buffer comprises an amphoteric compound and a melt stabilizer, with a mass ratio of 2:1.2. The amphoteric compound is stearate and the melt stabilizer is hydrotalcite.

[0066] The compatibilizer is a mixture of glycidyl methacrylate grafted ethylene-octene copolymer and ethylene-methyl acrylate-glyceryl methacrylate.

[0067] The lubricant is silicone powder and the halogen-free flame retardant is antimony pentoxide.

[0068] The present invention provides a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, comprising the following steps:

[0069] Step S1: weighing raw materials according to weight;

[0070] Step S2: mixing the mixed modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 7 minutes to obtain a mixed material;

[0071] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0072] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 1.5 minutes.

[0073] Embodiment three:

[0074] The present invention provides a highly hydrolysis-resistant glass fiber reinforced polyester material, which comprises the following raw materials in parts by weight: 56 parts of mixed modified polyester resin, 18 parts of glass fiber, 10 parts of anti-hydrolysis agent, 13 parts of toughening agent, 6 parts of buffer, 0.4 parts of compatibilizer, 0.8 parts of lubricant and 8 parts of halogen-free flame retardant;

[0075] The modified polyester resin includes silicone modified polyester resin and acrylate modified polyester resin, and the weight ratio of the silicone modified polyester resin to the acrylate modified polyester resin is 6:5.

[0076] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 1.4 dl / g.

[0077] The glass fiber is an alkali-free, untwisted chopped glass fiber with a diameter of 10 μm and treated with a silane coupling agent. The chopped length of the glass fiber is 4.4 mm.

[0078] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is 13:1.2.

[0079] The toughening agent is maleic anhydride grafted polypropylene.

[0080] The buffer comprises an amphoteric compound and a melt stabilizer, with a mass ratio of 2.2:1.3. The amphoteric compound is stearate and the melt stabilizer is hydrotalcite.

[0081] The compatibilizer is a mixture of ethylene-methyl acrylate-glyceryl methacrylate and styrene-acrylonitrile-glycidyl methacrylate.

[0082] The lubricants are silicone powder and pentaerythritol stearate, and the halogen-free flame retardant is antimony pentoxide.

[0083] The present invention provides a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, comprising the following steps:

[0084] Step S1: weighing raw materials according to weight;

[0085] Step S2: mixing the mixed modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 7 minutes to obtain a mixed material;

[0086] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0087] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 1.5 minutes.

[0088] Embodiment 4:

[0089] The modified polyester resin includes silicone modified polyester resin and acrylate modified polyester resin, and the weight ratio of the silicone modified polyester resin to the acrylate modified polyester resin is 7:5.

[0090] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 0.8 dl / g.

[0091] The glass fiber is an alkali-free, untwisted chopped glass fiber with a diameter of 8 μm and treated with a silane coupling agent. The chopped length of the glass fiber is 4 mm.

[0092] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is 14:1.5.

[0093] The toughening agent is maleic anhydride grafted polypropylene.

[0094] The buffer comprises an amphoteric compound and a melt stabilizer, with a mass ratio of 2.5:1.4. The amphoteric compound is stearate and the melt stabilizer is hydrotalcite.

[0095] The compatibilizer is a mixture of ethylene-methyl acrylate-glyceryl methacrylate and styrene-acrylonitrile-glycidyl methacrylate.

[0096] The lubricants are silicone powder, pentaerythritol stearate and erucamide, and the halogen-free flame retardant is antimony trioxide.

[0097] The present invention provides a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, comprising the following steps:

[0098] Step S1: weighing raw materials according to weight;

[0099] Step S2: mixing the mixed modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 6 minutes to obtain a mixed material;

[0100] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0101] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 2 minutes.

[0102] Comparative Example 1:

[0103] This comparative example provides a highly hydrolysis-resistant glass fiber reinforced polyester material. The embodiment of the present invention provides a highly hydrolysis-resistant glass fiber reinforced polyester material. The polyester material includes the following raw materials in parts by weight: 36 parts of polyester resin, 9 parts of glass fiber, 6 parts of anti-hydrolysis agent, 4 parts of toughening agent, 2 parts of buffer, 0.2 parts of compatibilizer, 0.1 parts of lubricant and 3 parts of halogen-free flame retardant.

[0104] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 1.2 dl / g.

[0105] The glass fiber is an alkali-free, untwisted chopped glass fiber with a diameter of 10 μm and treated with a silane coupling agent. The chopped length of the glass fiber is 4 mm.

[0106] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is 12:1.1.

[0107] The toughening agent is ethylene-butyl methacrylate-glycidyl acrylate copolymer.

[0108] The buffer comprises an amphoteric compound and a melt stabilizer, with a mass ratio of 1.8:1.1. The amphoteric compound is stearate and the melt stabilizer is hydrotalcite.

[0109] The compatibilizer is glycidyl methacrylate grafted ethylene-octene copolymer.

[0110] The lubricant is silicone powder and the halogen-free flame retardant is antimony trioxide.

[0111] The present comparative example provides a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, comprising the following steps:

[0112] Step S1: weighing raw materials according to weight;

[0113] Step S2: mixing the polyester resin, the anti-hydrolysis agent, the toughening agent, the buffer, the compatibilizer, the lubricant and the halogen-free flame retardant in a medium-speed mixer for 8 minutes to obtain a mixed material;

[0114] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0115] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 2 minutes.

[0116] The content of this comparative example 1 is different from that of Example 1 in that the raw material of this comparative example is polyester resin, not mixed modified polyester resin, and the rest is the same as that of Example 1.

[0117] Comparative Example 2:

[0118] This comparative example provides a highly hydrolysis-resistant glass fiber reinforced polyester material. The embodiment of the present invention provides a highly hydrolysis-resistant glass fiber reinforced polyester material, which includes the following raw materials in parts by weight: 36 parts of mixed modified polyester resin, 9 parts of glass fiber, 6 parts of anti-hydrolysis agent, 0.2 parts of compatibilizer, 0.1 parts of lubricant and 3 parts of halogen-free flame retardant;

[0119] The modified polyester resin includes silicone modified polyester resin and acrylate modified polyester resin, and the weight ratio of the silicone modified polyester resin to the acrylate modified polyester resin is 4:3.

[0120] The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 1.2 dl / g.

[0121] The glass fiber is an alkali-free, untwisted chopped glass fiber with a diameter of 10 μm and treated with a silane coupling agent. The chopped length of the glass fiber is 4 mm.

[0122] The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is 12:1.1.

[0123] The compatibilizer is glycidyl methacrylate grafted ethylene-octene copolymer.

[0124] The lubricant is silicone powder and the halogen-free flame retardant is antimony trioxide.

[0125] The present comparative example provides a method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, comprising the following steps:

[0126] Step S1: weighing raw materials according to weight;

[0127] Step S2: mixing the mixed modified polyester resin, anti-hydrolysis agent, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 8 minutes to obtain a mixed material;

[0128] Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

[0129] Among them, the production process conditions of step S3 are: the temperature of zone 1 of the twin-screw extruder is 180°C to 220°C, the temperature of zone 2 is 180°C to 220°C, the temperature of zone 3 is 200°C to 240°C, the temperature of zone 4 is 220°C to 260°C, and the conveying time of the mixed material in the screw is 2 minutes.

[0130] The content of this comparative example 2 is different from that of Example 1 in that no toughening agent and buffer are added to the raw materials of this comparative example, and the rest is the same as that of Example 1.

[0131] The weight parts of the components of Examples 1-4 and Comparative Examples 1-2 are as follows:

[0132]

[0133] The weight ratios of the components of the mixed modified polyester resin, anti-hydrolysis agent and buffer in Example 1-4 and Comparative Example 1-2 are as follows:

[0134]

[0135] Performance test experiment:

[0136] The polyester materials prepared in Examples 1-4 and the polyester materials prepared in Comparative Examples 1-2 were injection molded into standard test bars according to standard sizes, and the performance of the test bar samples was tested;

[0137] Hydrolysis resistance test method: place the standard test strip in a climate test chamber, at 85°C, 95% relative humidity, forced ventilation for 1500 hours, and take samples every 500 hours for testing;

[0138] The performance tests of polyester material test strip samples are carried out according to international standards:

[0139] Tensile strength: tested according to ISO 527 standard;

[0140] Notched impact strength: tested according to ISO 179 standard;

[0141] Maximum tensile elongation: tested according to ISO 527 standard;

[0142] The performance test results of the above Examples 1-4 and Comparative Examples 1-2 are as follows:

[0143]

[0144] Combined with the above implementation and comparative examples, and combined with the test results for analysis:

[0145] By comparing Examples 1-4 with Comparative Examples 1-2, the addition of glass fiber filling gives the material excellent mechanical properties and thermal stability. The polyester material of the present invention can always maintain good mechanical properties and excellent hydrolysis resistance under long-term humid and high temperature conditions.

[0146] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A highly hydrolysis-resistant glass fiber reinforced polyester material, characterized in that: The polyester material comprises the following raw materials in parts by weight: 36 to 65 parts of mixed modified polyester resin, 9 to 25 parts of glass fiber, 6 to 11 parts of anti-hydrolysis agent, 4 to 15 parts of toughening agent, 2 to 8 parts of buffer, 0.2 to 0.5 parts of compatibilizer, 0.1 to 1.0 parts of lubricant and 3 to 10 parts of halogen-free flame retardant; The modified polyester resin comprises an organosilicon-modified polyester resin and an acrylate-modified polyester resin, and the weight ratio of the organosilicon-modified polyester resin to the acrylate-modified polyester resin is (4-7):(3-5).

2. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The modified polyester resin is water-soluble, and the intrinsic viscosity of the modified polyester resin is 0.6 dl / g to 1.8 dl / g.

3. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The glass fiber is an alkali-free, untwisted short-cut glass fiber with a diameter of 8 μm to 16 μm and treated with a silane coupling agent. The short-cut length of the glass fiber is 4 mm to 4.8 mm.

4. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The anti-hydrolysis agent comprises epoxy resin containing epoxy groups and carbodiimide, and the mass ratio of the epoxy resin to the carbodiimide is (12-14): (1.1-1.5).

5. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The toughening agent is ethylene-butyl methacrylate-glycidyl acrylate copolymer or maleic anhydride grafted polypropylene.

6. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The buffer comprises an amphoteric compound and a melt stabilizer, and the mass ratio thereof is (1.8-2.5): (1.1-1.4). The amphoteric compound is stearate, and the melt stabilizer is hydrotalcite.

7. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The compatibilizer is a mixture of any one or more of glycidyl methacrylate grafted ethylene-octene copolymer, ethylene-methyl acrylate-glyceryl methacrylate and styrene-acrylonitrile-glycidyl methacrylate.

8. The highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 1, characterized in that: The lubricant is one or more of silicone powder, pentaerythritol stearate, erucic acid amide, and modified ethylene bis fatty acid amide, and the halogen-free flame retardant is antimony trioxide or antimony pentoxide.

9. A method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material, according to any one of claims 1 to 8, characterized in that: The steps include: Step S1: weighing raw materials according to weight; Step S2: mixing the modified polyester resin, anti-hydrolysis agent, toughening agent, buffer, compatibilizer, lubricant and halogen-free flame retardant in a medium-speed mixer for 5 to 8 minutes to obtain a mixed material; Step S3: The mixture obtained in the above step S2 is placed in a twin-screw extruder and mixed with glass fibers, and then melt-extruded and granulated to obtain a highly hydrolysis-resistant glass fiber reinforced polyester material.

10. The method for preparing a highly hydrolysis-resistant glass fiber reinforced polyester material according to claim 9, characterized in that The production process conditions of step S3 are as follows: the temperature of the first zone of the twin-screw extruder is 180°C to 220°C, the temperature of the second zone is 180°C to 220°C, the temperature of the third zone is 200°C to 240°C, the temperature of the fourth zone is 220°C to 260°C, and the mixed material is conveyed in the screw for 1 to 2 minutes.

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