CN111154241A - Reinforced flame-retardant low-warpage PBT (polybutylene terephthalate) composite material and preparation method thereof - Google Patents
Reinforced flame-retardant low-warpage PBT (polybutylene terephthalate) composite material and preparation method thereof Download PDFInfo
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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Abstract
The invention discloses a reinforced flame-retardant low-warpage PBT (polybutylene terephthalate) composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 40-60 parts of polybutylene terephthalate; 15-30 parts of glass fiber; 10-20 parts of inorganic filler; 5-20 parts of a compound flame retardant; 5-10 parts of a toughening agent; 0.2-0.4 part of compound antioxidant; 0.1-0.3 part of lubricant; 0.1-0.3 part of anti-dripping agent. The preparation method comprises the steps of uniformly mixing the materials except the glass fibers at a high speed, respectively feeding the mixed materials and the glass fibers into a main feeding port and a side feeding port of a double-screw extruder, and finally forming. According to the invention, the glass fiber, the inorganic filler and the compound flame retardant are added in the formula, so that the PBT composite material has good mechanical property, flame retardant property and anti-warping property, and the application range of the PBT composite material in the fields of high-grade electrical parts, large electrical housings and the like is expanded.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a reinforced flame-retardant low-warpage PBT composite material and a preparation method thereof.
Background
Polybutylene terephthalate (PBT) has excellent heat resistance, good moldability, electrical insulation properties, and the like, and thus is widely used in the industries of electronics, electricity, automobile switches, and the like. However, injection molded articles tend to shrink and warp due to crystallization of the PBT, making it generally difficult to use the crystalline polymer PBT in a variety of precision and large-scale products; and the product does not have flame retardant property, and still has a worry in safety. Therefore, the development of PBT materials having both warp resistance and flame retardancy is urgent.
Disclosure of Invention
The invention aims to provide a reinforced flame-retardant low-warpage PBT composite material and a preparation method thereof, and realizes a composite material with flame-retardant and low-warpage characteristics so as to meet application requirements of related products.
In order to achieve the above purpose, the solution of the invention is:
the reinforced flame-retardant low-warpage PBT composite material comprises the following raw materials in parts by weight: 40-60 parts of polybutylene terephthalate; 15-30 parts of glass fiber; 10-20 parts of inorganic filler; 5-20 parts of a compound flame retardant; 5-10 parts of a toughening agent; 0.2-0.4 part of compound antioxidant; 0.1-0.3 part of lubricant; 0.1-0.3 part of anti-dripping agent.
The polybutylene terephthalate has an intrinsic viscosity of 0.8-1.0 dL/g.
The glass fiber comprises at least one of common alkali-free glass fiber and flat glass fiber.
The inorganic filler comprises at least one of calcium carbonate, talcum powder and glass beads.
The compound flame retardant is prepared by mixing a brominated flame retardant and an antimony synergistic flame retardant; wherein, the bromine flame retardant comprises at least one of decabromodiphenylethane, brominated epoxy and brominated styrene, and the antimony synergistic flame retardant comprises at least one of antimony trioxide and antimony trioxide master batch.
The toughening agent comprises at least one of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and ethylene-butyl acrylate-glycidyl methacrylate copolymer.
The compound antioxidant is prepared by mixing hindered phenol antioxidant and phosphite ester antioxidant; wherein the hindered phenol antioxidant comprises at least one of hindered phenol antioxidant 1010 and hindered phenol antioxidant 1076, and the phosphite antioxidant comprises at least one of phosphite antioxidant 626 and phosphite antioxidant 168.
The lubricant comprises at least one of silicone master batch, ethylene bisstearamide and pentaerythritol stearate.
The anti-dripping agent is polytetrafluoroethylene.
A preparation method of a reinforced flame-retardant low-warpage PBT composite material comprises the following steps:
uniformly mixing polybutylene terephthalate, inorganic filler, a compound flame retardant, a toughening agent, a compound antioxidant, a lubricant and an anti-dripping agent at a high speed by a high-speed mixer to obtain a mixed material;
and step two, adding the mixed material into a main feeding port of a double-screw extruder, adding the glass fiber into a side feeding port of the double-screw extruder, and melting, extruding, cooling, drying and granulating the mixture into granules.
The temperature of each zone of the screw barrel of the double-screw extruder is set to be 200-240 ℃, and the rotating speed of the screw is 350 rpm.
By adopting the technical scheme, the glass fiber, the inorganic filler and the compound flame retardant are added in the formula, so that the PBT composite material has good mechanical property, flame retardant property and anti-warping property, and the application range of the PBT composite material in the fields of high-grade electrical parts, large electrical housings and the like is expanded.
In addition, when the cross section of the glass fiber is flat, the strength of the formed product is greatly improved and the warping is greatly reduced; when the inorganic filler includes glass beads, the anisotropy of the composite material can be further improved, so that the warp resistance of a product filled therewith is improved.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
The invention relates to a reinforced flame-retardant low-warpage PBT (polybutylene terephthalate) composite material which comprises the following raw materials in parts by weight: 40-60 parts of polybutylene terephthalate (PBT); 15-30 parts of glass fiber; 10-20 parts of inorganic filler; 5-20 parts of a compound flame retardant; 5-10 parts of a toughening agent; 0.2-0.4 part of compound antioxidant; 0.1-0.3 part of lubricant; 0.1-0.3 part of anti-dripping agent.
The polybutylene terephthalate has an intrinsic viscosity of 0.8 to 1.0 dL/g.
The glass fiber comprises at least one of common alkali-free glass fiber and flat glass fiber. The glass fiber with the flattened cross section can be dispersed isotropically in the injection molding process, and is beneficial to preventing the PBT material part from warping after being demoulded.
The inorganic filler comprises at least one of calcium carbonate, talcum powder and glass beads. The glass beads with highly symmetrical structures are adopted, so that the anisotropy of the composite material can be effectively improved, and the warping property and the fluidity of the composite material can be improved.
The compound flame retardant is prepared by mixing a brominated flame retardant and an antimony synergistic flame retardant; wherein, the bromine flame retardant comprises at least one of decabromodiphenylethane, brominated epoxy and brominated styrene, and the antimony synergistic flame retardant comprises at least one of antimony trioxide and antimony trioxide master batch.
The toughening agent comprises at least one of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and ethylene-butyl acrylate-glycidyl methacrylate copolymer.
The compound antioxidant is prepared by mixing hindered phenol antioxidant and phosphite ester antioxidant; wherein the hindered phenol antioxidant comprises at least one of hindered phenol antioxidant 1010 and hindered phenol antioxidant 1076, and the phosphite antioxidant comprises at least one of phosphite antioxidant 626 and phosphite antioxidant 168.
The lubricant comprises at least one of silicone master batch, ethylene bisstearamide and pentaerythritol stearate.
The anti-dripping agent is polytetrafluoroethylene.
The invention also comprises a preparation method of the reinforced flame-retardant low-warpage PBT composite material, which comprises the following steps:
uniformly mixing polybutylene terephthalate, inorganic filler, a compound flame retardant, a toughening agent, a compound antioxidant, a lubricant and an anti-dripping agent at a high speed by a high-speed mixer to obtain a mixed material;
and step two, adding the mixed material into a main feeding port of a double-screw extruder, adding the glass fiber into a side feeding port of the double-screw extruder, and melting, extruding, cooling, drying and granulating the mixture into granules.
The temperature of each zone of the screw barrel of the double-screw extruder is set to be 200-240 ℃, and the rotating speed of the screw is 350 rpm.
The technical effects of the present invention are illustrated below by specific examples and comparative examples.
Example 1
(1) Weighing the following components in parts by weight: PBT: 48 parts of common alkali-free glass fiber: 21 parts of glass beads: 13 parts, brominated epoxy: 9 parts of antimony trioxide: 2.5 parts, ethylene-methyl acrylate copolymer: 6 parts of antioxidant 1010: 0.1 part, antioxidant 168: 0.1 part of lubricant PETS (pentaerythritol stearate): 0.2 part of polytetrafluoroethylene and 0.1 part of polytetrafluoroethylene;
(2) after raw materials except the glass fiber are uniformly mixed in a high-speed mixer, the glass fiber is fed from a side feeding port, and is melted and extruded by an extruder at the extrusion temperature of 200-240 ℃ and the screw rotation speed of 350rpm, and then the mixture is cooled, dried and granulated into granules, so that the product is obtained.
Example 2
(1) Weighing the following components in parts by weight: PBT: 48 parts of flattened glass fiber: 21 parts, calcium carbonate: 13 parts, brominated epoxy: 9 parts of antimony trioxide: 2.5 parts, ethylene-methyl acrylate copolymer: 6 parts of antioxidant 1010: 0.1 part, antioxidant 168: 0.1 part, a lubricant PETS: 0.2 part of polytetrafluoroethylene and 0.1 part of polytetrafluoroethylene;
(2) after raw materials except the glass fiber are uniformly mixed in a high-speed mixer, the glass fiber is fed from a side feeding port, and is melted and extruded by an extruder at the extrusion temperature of 200-240 ℃ and the screw rotation speed of 350rpm, and then the mixture is cooled, dried and granulated into granules, so that the product is obtained.
Example 3
(1) Weighing the following components in parts by weight: PBT: 48 parts of flattened glass fiber: 21 parts of glass beads: 13 parts, brominated epoxy: 9 parts of antimony trioxide: 2.5 parts, ethylene-methyl acrylate copolymer: 6 parts of antioxidant 1010: 0.1 part, antioxidant 168: 0.1 part, a lubricant PETS: 0.2 part of polytetrafluoroethylene and 0.1 part of polytetrafluoroethylene;
(2) after raw materials except the glass fiber are uniformly mixed in a high-speed mixer, the glass fiber is fed from a side feeding port, and is melted and extruded by an extruder at the extrusion temperature of 200-240 ℃ and the screw rotation speed of 350rpm, and then the mixture is cooled, dried and granulated into granules, so that the product is obtained.
Comparative example
(1) Weighing the following components in parts by weight: PBT: 48 parts of common alkali-free glass fiber: 21 parts, calcium carbonate: 13 parts, brominated epoxy: 9 parts of antimony trioxide: 2.5 parts, ethylene-methyl acrylate copolymer: 6 parts of antioxidant 1010: 0.1 part, antioxidant 168: 0.1 part, a lubricant PETS: 0.2 part of polytetrafluoroethylene and 0.1 part of polytetrafluoroethylene;
(2) after raw materials except the glass fiber are uniformly mixed in a high-speed mixer, the glass fiber is fed from a side feeding port, and is melted and extruded by an extruder at the extrusion temperature of 200-240 ℃ and the screw rotation speed of 350rpm, and then the mixture is cooled, dried and granulated into granules, so that the product is obtained.
The examples 1 to 3 and the comparative example are all injection-molded into circular plates with the diameter of 100mm and the thickness of 3mm, the maximum height A of the circular plates after warping is tested by a vernier caliper after the circular plates are placed for 48h at constant temperature and humidity, the warping degree of the material is represented by the ratio of the maximum height A to the diameter D of the circular plates, and the warping degree is A/D. Warpage and other physical and chemical properties are shown in the following table:
as can be seen from example 1 and comparative example, the better the symmetry of the glass beads, the more obvious the isotropy is exhibited, and the better the warpage resistance of the product filled with the glass beads is; however, the impact properties are reduced compared to the filled calcium carbonate. In addition, the addition of the compound flame retardant enables all the examples and the comparisons to have good flame retardant performance. From the results of examples 1, 2 and 3, the flattened glass fibers and the glass beads act together to provide toughness and warp resistance to the filled product; in conclusion, example 3 can meet the application of products requiring both flame retardancy and low warpage.
According to the scheme, the glass fiber, the inorganic filler and the compound flame retardant are added in the formula, so that the PBT composite material has good mechanical property, flame retardant property and anti-warping property, and the application range of the PBT composite material in the fields of high-grade electrical parts, large electrical housings and the like is expanded.
In addition, when the cross section of the glass fiber is flat, the strength of the formed product is greatly improved and the warping is greatly reduced; when the inorganic filler includes glass beads, the anisotropy of the composite material can be further improved, so that the warp resistance of a product filled therewith is improved.
The above embodiments are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (10)
1. The reinforced flame-retardant low-warpage PBT composite material is characterized by comprising the following raw materials in parts by weight: 40-60 parts of polybutylene terephthalate; 15-30 parts of glass fiber; 10-20 parts of inorganic filler; 5-20 parts of a compound flame retardant; 5-10 parts of a toughening agent; 0.2-0.4 part of compound antioxidant; 0.1-0.3 part of lubricant; 0.1-0.3 part of anti-dripping agent.
2. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the polybutylene terephthalate has an intrinsic viscosity of 0.8-1.0 dL/g.
3. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the glass fiber comprises at least one of common alkali-free glass fiber and flat glass fiber.
4. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the inorganic filler comprises at least one of calcium carbonate, talcum powder and glass beads.
5. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the compound flame retardant is prepared by mixing a brominated flame retardant and an antimony synergistic flame retardant; wherein, the bromine flame retardant comprises at least one of decabromodiphenylethane, brominated epoxy and brominated styrene, and the antimony synergistic flame retardant comprises at least one of antimony trioxide and antimony trioxide master batch.
6. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the toughening agent comprises at least one of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer and ethylene-butyl acrylate-glycidyl methacrylate copolymer.
7. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the compound antioxidant is prepared by mixing hindered phenol antioxidant and phosphite ester antioxidant; wherein the hindered phenol antioxidant comprises at least one of hindered phenol antioxidant 1010 and hindered phenol antioxidant 1076, and the phosphite antioxidant comprises at least one of phosphite antioxidant 626 and phosphite antioxidant 168.
8. The reinforced flame-retardant low-warpage PBT composite material of claim 1, wherein:
the lubricant comprises at least one of silicone master batch, ethylene bisstearamide and pentaerythritol stearate;
the anti-dripping agent is polytetrafluoroethylene.
9. The preparation method of the reinforced flame-retardant low-warpage PBT composite material is characterized by comprising the following steps of:
uniformly mixing polybutylene terephthalate, inorganic filler, a compound flame retardant, a toughening agent, a compound antioxidant, a lubricant and an anti-dripping agent at a high speed by a high-speed mixer to obtain a mixed material;
and step two, adding the mixed material into a main feeding port of a double-screw extruder, adding the glass fiber into a side feeding port of the double-screw extruder, and melting, extruding, cooling, drying and granulating the mixture into granules.
10. The preparation method of the reinforced flame-retardant low-warpage PBT composite material as claimed in claim 9, wherein:
the temperature of each zone of the screw barrel of the double-screw extruder is set to be 200-240 ℃, and the rotating speed of the screw is 350 rpm.
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| CN113337089A (en) * | 2021-07-22 | 2021-09-03 | 合肥圆融新材料有限公司 | Glass fiber reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof |
| CN114085495A (en) * | 2021-10-15 | 2022-02-25 | 南京聚隆科技股份有限公司 | Glass fiber reinforced PBT (polybutylene terephthalate) material and preparation method thereof |
| CN114605789A (en) * | 2022-02-28 | 2022-06-10 | 金发科技股份有限公司 | PBT composite material and preparation method and application thereof |
| CN115612259A (en) * | 2022-10-10 | 2023-01-17 | 金发科技股份有限公司 | Easily-sprayed and low-warpage PBT (polybutylene terephthalate) composition and preparation method thereof |
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| CN114085495A (en) * | 2021-10-15 | 2022-02-25 | 南京聚隆科技股份有限公司 | Glass fiber reinforced PBT (polybutylene terephthalate) material and preparation method thereof |
| CN114605789A (en) * | 2022-02-28 | 2022-06-10 | 金发科技股份有限公司 | PBT composite material and preparation method and application thereof |
| CN114605789B (en) * | 2022-02-28 | 2023-12-05 | 金发科技股份有限公司 | PBT composite material and preparation method and application thereof |
| CN115612259A (en) * | 2022-10-10 | 2023-01-17 | 金发科技股份有限公司 | Easily-sprayed and low-warpage PBT (polybutylene terephthalate) composition and preparation method thereof |
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Application publication date: 20200515 |