Thermoplastic polyester elastomer flame-retardant composition and preparation method thereof

Abstract

The invention provides a thermoplastic polyester elastomer flame-retardant composition and a preparation method thereof, and belongs to the technical field of macromolecules, the thermoplastic polyester elastomer flame-retardant composition comprises the following components by weight: 25-35% of a thermoplastic polyester elastomer; 35-45% by weight of a hot melt adhesive; 5-10% by weight of elastic modified asphalt; 5-12% by weight of an epoxy polymer; and 5-12% by weight of a flame retardant. According to the thermoplastic polyester elastomer flame-retardant composition and the preparation method thereof, the physical state of the thermoplastic polyester elastomer flame-retardant composition is changed along with temperature change within a certain temperature range, so that the composition adapts to external temperature change, the influence of external heat on the interior of the composition is reduced, and heat is isolated; the elastic modified asphalt has high elastic recovery rate, excellent rutting resistance and excellent high-temperature crack resistance, the epoxy polymer enables the composition to have excellent physical, mechanical and electrical insulation properties, and the flame retardant has high heat resistance and flame retardance, so that the use safety of the composition is improved.

Description

Technical Field

[0001] The invention belongs to the field of polymer technology, and specifically relates to a thermoplastic polyester elastomer flame retardant composition and a preparation method thereof. Background Art

[0002] Thermoplastic polyester elastomer (TPEE) is a linear block copolymer of polyester hard segment and aliphatic polyester or polyether soft segment. It has both the elasticity of rubber and the processability of thermoplastics and is widely used in wires and cables, household appliances, automobile manufacturing, medical and other fields. Flame retardant properties are an important indicator of thermoplastic elastomers and have attracted much attention. Thermoplastic polyester elastomers with excellent flame retardant properties have been widely studied.

[0003] The existing thermoplastic polyester elastomer flame retardant composition has the problem of poor flame retardant effect, cannot effectively prevent the influence of external fire source and high temperature on it, cannot effectively protect the user in dangerous scenes, reduces the practicality of use, and is not conducive to people's use. Summary of the invention

[0004] The object of the present invention is to provide a thermoplastic polyester elastomer flame retardant composition and a preparation method thereof, aiming to solve the problem that the existing thermoplastic polyester elastomer flame retardant composition in the prior art has poor flame retardant effect.

[0005] To achieve the above object, the present invention provides the following technical solution: a thermoplastic polyester elastomer flame retardant composition, comprising the following components:

[0006] 25-35% by weight of thermoplastic polyester elastomer;

[0007] 35-45% by weight of hot melt adhesive;

[0008] 5-10% by weight of elastic modified asphalt;

[0009] 5-12% by weight epoxy polymer;

[0010] The weight percentage is 5-12% flame retardant.

[0011] In order to make the thermoplastic polyester elastomer flame retardant composition achieve the thermoplastic effect, as a preferred embodiment of the present invention, the thermoplastic polyester elastomer is composed of a block copolymer of a polyester hard segment and a polyether soft segment, the polyester hard segment is selected from one of high hardness crystalline polybutylene terephthalate, poly(terephthalate) glycol ester or poly(terephthalate) glycol ester; the polyether soft segment is selected from one of polyethylene glycol ether, polypropylene glycol ether, polybutylene glycol ether, polylactide, polyglycolide or polycaprolactone.

[0012] In order to make the thermoplastic polyester elastomer flame retardant composition achieve high temperature resistance, as a preferred embodiment of the present invention, the hot melt adhesive is formed by copolymerization of ethylene and vinyl acetate under high temperature and high pressure.

[0013] In order to make the thermoplastic polyester elastomer flame retardant composition achieve the flame retardant effect, as a preferred embodiment of the present invention, the elastic modified asphalt is mixed with styrene-butadiene-styrene rubber modified asphalt and glass fiber felt, polyester felt, and glass fiber reinforced polyester felt.

[0014] In order to make the thermoplastic polyester elastomer flame retardant composition achieve the anti-oxidation effect, as a preferred embodiment of the present invention, the epoxy polymer is a polymer containing epoxy active end groups.

[0015] In order to make the thermoplastic polyester elastomer flame retardant composition achieve enhanced flame retardant effect, as a preferred embodiment of the present invention, the flame retardant is selected from one or more of nitrogen-phosphorus flame retardants or triazine flame retardants.

[0016] The method for preparing the thermoplastic polyester elastomer flame retardant composition, as a preferred embodiment of the present invention, comprises the following steps:

[0017] S1: Pretreatment: drying the thermoplastic polyester elastomer, and grinding the dried thermoplastic polyester elastomer with a high-speed ball mill to a particle size of 5 to 10 μm;

[0018] S2: Mixing and granulation: Mix the ingredients in a twin-screw extruder, mix them evenly and then extrude them into granules.

[0019] In order to facilitate the drying effect of the preparation method of the thermoplastic polyester elastomer flame retardant composition, as a preferred embodiment of the present invention, the drying treatment in S1 refers to a temperature of 70 to 100° C. and a vacuum drying time of 3 to 24 hours.

[0020] In order to make the thermoplastic polyester elastomer flame retardant composition and the preparation method thereof easy to extrude, as a preferred embodiment of the present invention, the temperature of each zone of the twin-screw extruder in S2 is controlled at 200-240°C and the rotation speed is 40-100 rpm.

[0021] In order to make the thermoplastic polyester elastomer flame retardant composition and the preparation method thereof easy to shape, as a preferred embodiment of the present invention, the raw materials are subjected to twin-screw extrusion and granulation to obtain the thermoplastic polyester elastomer flame retardant composition.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The thermoplastic polyester elastomer flame retardant composition and its preparation method have an abnormally high elastic modulus and do not change with relative molecular mass. They are high in strength, soft, rubber elastic, and have small permanent deformation. They have excellent ozone resistance, oxidation resistance, UV resistance, and weather resistance. They also have excellent wear resistance, oil resistance, and cold resistance. Within a certain temperature range, their physical state changes with temperature, thereby adapting to external temperature changes, reducing the impact of external heat on the interior of the composition, and isolating heat. The elastic modified asphalt has a high elastic recovery rate, excellent anti-rutting performance, and superior high-temperature crack resistance. The epoxy polymer enables the composition to have excellent physical, mechanical, and electrical insulation properties and flexibility in the use process. The flame retardant has high heat resistance and flame retardancy, thereby improving the safety of the composition. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the ingredient structure of the thermoplastic polyester elastomer flame retardant composition of the present invention;

[0026] Figure 2 It is a schematic diagram of the performance comparison structure of the thermoplastic polyester elastomer flame retardant composition of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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] Example

[0029] See also Figure 1-2 The present invention provides the following technical solution: a thermoplastic polyester elastomer flame retardant composition, comprising the following components:

[0030] 25-35% by weight of thermoplastic polyester elastomer;

[0031] 35-45% by weight of hot melt adhesive;

[0032] 5-10% by weight of elastic modified asphalt;

[0033] 5-12% by weight epoxy polymer;

[0034] The weight percentage is 5-12% flame retardant.

[0035] Specifically, the thermoplastic polyester elastomer is composed of a block copolymer of a polyester hard segment and a polyether soft segment, wherein the polyester hard segment is selected from one of high-hardness crystalline polybutylene terephthalate, polyethylene terephthalate or polypropylene terephthalate; and the polyether soft segment is selected from one of polyethylene glycol ether, polypropylene glycol ether, polybutylene glycol ether, polylactide, polyglycolide or polycaprolactone.

[0036] Specifically, hot melt adhesive is made by copolymerizing ethylene and vinyl acetate under high temperature and high pressure.

[0037] Specifically, the elastic modified asphalt is a mixture of styrene-butadiene-styrene rubber modified asphalt and glass fiber felt, polyester felt, and glass fiber reinforced polyester felt.

[0038] Specifically, the epoxy polymer is a polymer containing epoxy active end groups.

[0039] Specifically, the flame retardant is selected from one or more of nitrogen-phosphorus flame retardants or triazine flame retardants.

[0040] In this embodiment: Thermoplastic polyester elastomer is composed of a block copolymer of polyester hard segment and polyether soft segment, with an abnormally high elastic modulus and does not change with relative molecular mass, and has the characteristics of high strength, softness, rubber elasticity, and small permanent deformation. The operating temperature can reach 130°C, and it has excellent ozone resistance, oxidation resistance, UV resistance and weather resistance. It also has excellent wear resistance, oil resistance and cold resistance, and has sufficient resistance to hydrogen, hydrogen and radiation. At the same time, as an elastomer, it has very high tensile strength and elongation at break, and also has excellent properties such as small compression permanent deformation and large load-bearing capacity. Hot melt adhesive is copolymerized by ethylene and vinyl acetate under high temperature and high pressure. Within a certain temperature range, its physical state changes with temperature, thereby adapting to external temperature changes and reducing external heat. The influence on the interior of the composition is isolated from heat. The elastic modified asphalt is a mixture of styrene-butadiene-styrene rubber modified asphalt and glass fiber felt, polyester felt, and glass fiber reinforced polyester felt. It has the advantages of heat resistance, cold resistance, corrosion resistance, aging resistance, good thermoplasticity, high tensile strength, high elongation, and strong tear resistance. The epoxy polymer is a polymer containing epoxy active end groups, which has excellent chemical resistance, especially alkali resistance, strong paint film adhesion, especially to metal, has good heat resistance and electrical insulation, and the paint film has good color retention, so that the composition has excellent physical, mechanical and electrical insulation properties and flexibility of use process. The flame retardant is selected from one or more of nitrogen-phosphorus flame retardants or triazine flame retardants, and has high heat resistance and flame retardancy, thereby improving the safety of the composition.

[0041] A conventional thermoplastic polyester elastomer is vacuum dried at 80° C. for 8 hours and placed at room temperature for standby use; the thermoplastic polyester elastomer is taken and extruded and granulated at a speed of 60 rpm using a twin-screw extruder with each zone temperature controlled at 220° C. to obtain a thermoplastic polyester elastomer composition without flame retardant effect;

[0042] The prepared thermoplastic polyester elastomer composition was tested, and the limiting oxygen index of the composite material was 16.2, and the vertical burning grade was zero;

[0043] The tensile strength and elongation at break are tested according to ISO 527-1, 2 standards; the flexural modulus is tested according to ISO 178 standards; the notched impact strength and unnotched impact strength of simply supported beams are tested according to ISO 179-1, 2 standards; the heat deformation temperature is tested according to ISO 75-1, 2 standards; the flame retardant performance is tested according to the "UL94 Plastic Burning Performance Test Standard" and GB / T 2408 standards; the compression permanent deformation is tested according to GB / T 7759.1-2015 "Determination of Compression Permanent Deformation of Vulcanized Rubber or Thermoplastic Rubber"; the tear strength is tested according to ASTMD624 standard "Tear Strength of Rubber and Thermoplastic Elastomers";

[0044] The performance test results of the embodiment are shown in Figure 2 ;

[0045] The thermoplastic polyester elastomer used in the composition of the present invention, combined with hot melt adhesive, elastic modified asphalt, epoxy polymer and flame retardant, can achieve excellent flame retardant properties. In summary, the thermoplastic polyester elastomer flame retardant composition provided by the present invention is different from the existing thermoplastic polyester elastomer structure, can achieve single molecule expansion flame retardancy, and has high flame retardant efficiency.

[0046] A method for preparing a thermoplastic polyester elastomer flame retardant composition comprises the following steps:

[0047] S1: Pretreatment: drying the thermoplastic polyester elastomer, and grinding the dried thermoplastic polyester elastomer with a high-speed ball mill to a particle size of 5 to 10 μm;

[0048] S2: Mixing and granulation: Mix the ingredients in a twin-screw extruder, mix them evenly and then extrude them into granules.

[0049] Specifically, the drying treatment in S1 refers to a temperature of 70 to 100° C. and a vacuum drying time of 3 to 24 hours.

[0050] Specifically, the temperature of each zone of the twin-screw extruder in S2 is controlled at 200-240° C., and the rotation speed is 40-100 rpm.

[0051] Specifically, the raw materials are subjected to twin-screw extrusion and granulation to obtain a thermoplastic polyester elastomer flame retardant composition.

[0052] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flame retardant thermoplastic polyester elastomer composition, characterized in that: The invention comprises the following components: 25-35% by weight of a thermoplastic polyester elastomer; 35-45% by weight of hot melt adhesive; 5-10% by weight of elastic modified asphalt; 5-12% by weight epoxy polymer; The weight percentage is 5-12% flame retardant.

2. A thermoplastic polyester elastomer flame retardant composition according to claim 1, characterized in that: The thermoplastic polyester elastomer is composed of a block copolymer of a polyester hard segment and a polyether soft segment, wherein the polyester hard segment is selected from one of high-hardness crystalline polybutylene terephthalate, polyethylene terephthalate or polypropylene terephthalate; and the polyether soft segment is selected from one of polyethylene glycol ether, polypropylene glycol ether, polybutylene glycol ether, polylactide, polyglycolide or polycaprolactone.

3. The thermoplastic polyester elastomer flame retardant composition according to claim 1, characterized in that: The hot melt adhesive is formed by copolymerization of ethylene and vinyl acetate under high temperature and high pressure.

4. The thermoplastic polyester elastomer flame retardant composition according to claim 1, characterized in that: The elastic modified asphalt is prepared by mixing styrene-butadiene-styrene rubber modified asphalt with glass fiber felt, polyester felt and glass fiber reinforced polyester felt.

5. The thermoplastic polyester elastomer flame retardant composition according to claim 1, characterized in that: The epoxy polymer is a polymer containing epoxy active terminal groups.

6. A flame retardant thermoplastic polyester elastomer composition according to claim 1, characterized in that: The flame retardant is selected from one or more of nitrogen-phosphorus flame retardants or triazine flame retardants.

7. A method for preparing a thermoplastic polyester elastomer flame retardant composition according to claims 1-6, comprising the following steps: S1： Pretreatment: drying the thermoplastic polyester elastomer, and grinding the dried thermoplastic polyester elastomer with a high-speed ball mill to a particle size of 5 to 10 μm; S2: Mixing and granulation: Mix the ingredients in a twin-screw extruder, mix them evenly and then extrude them into granules.

8. The method for preparing a flame retardant thermoplastic polyester elastomer composition according to claim 7, characterized in that: The drying process in S1 refers to a temperature of 70 to 100° C. and a vacuum drying time of 3 to 24 hours.

9. The method for preparing a flame retardant thermoplastic polyester elastomer composition according to claim 7, characterized in that: The temperature of each zone of the twin-screw extruder in S2 is controlled at 200-240° C., and the rotation speed is 40-100 rpm.

10. The method for preparing a flame retardant thermoplastic polyester elastomer composition according to claim 7, characterized in that: The raw materials are subjected to twin-screw extrusion and granulation to obtain a thermoplastic polyester elastomer flame retardant composition.

Images