WO2020168979A1 - Fatigue-proof insulating pvc plastic - Google Patents

Abstract

A fatigue-proof insulating PVC plastic, comprising the following materials in parts by weight: 60-70 parts of polyvinyl chloride, 18-22 parts of a high-molecular polymer, 20-25 parts of a plasticizer, 6-10 parts of a stabilizer, 6-8 parts of a filler, 3-5 parts of an antioxidant, 1-3 parts of a lubricant, and 0.5-1 part of a slipping agent. The chemical components of the fatigue-proof insulating PVC plastic are optimized and the inner structure of the PVC plastic is microcosmically improved, so that the fatigue-proof insulating PVC plastic has an excellent fatigue-proof property and an insulating property.

Description

Fatigue-resistant insulating PVC plastic Technical field

The invention relates to a plastic, in particular to a fatigue-resistant insulating PVC plastic.

Background technique

Polyvinyl chloride has the advantages of flame retardancy, high chemical resistance, good mechanical strength and electrical insulation; polyvinyl chloride has poor stability to light and heat. The softening point is 80°C, and it starts to decompose at 130°C. Without heating the stabilizer, polyvinyl chloride starts to decompose at 100°C, and decomposes faster above 130°C. When heated, it decomposes and releases hydrogen chloride gas, causing it to change color from white→light yellow→red→brown→black. The ultraviolet rays and oxygen in the sunlight will cause the photo-oxidation and decomposition of polyvinyl chloride, which will reduce the flexibility of polyvinyl chloride and finally become brittle. It is not difficult to understand from here why some PVC plastics will turn yellow and become brittle over time. With the development of social urbanization, technology, and humanization, and the rapid development of the PVC industry, PVC materials are getting closer to people’s lives. What follows is the increase in the use of PVC cable materials, and PVC cable materials are mostly easy to use. Problems such as aging, fatigue, decomposition and poor insulation are manifested. With the popularization of humanized concepts and the formation of a new harmonious society, it is very necessary to design a method of fatigue-resistant insulating PVC cable material.

The existing fatigue-resistant insulating PVC is mainly composed of PVC, plasticizers, flame retardants, etc. Chinese patent CN102993524A discloses a cable sheath insulation material for coal mines, which uses PVC, semi-reinforced carbon black, and ferrocene It is combined with zinc borate, but considering that the heat resistance and anti-fatigue effect is not good, and the resistivity is high, the existing technology is slightly insufficient.

Summary of the invention

In view of the above shortcomings, the purpose of the present invention is to develop a fatigue-resistant insulating PVC plastic, which has excellent aging resistance, fatigue resistance and insulation properties.

The technical scheme of the present invention is summarized as follows:

A fatigue-resistant insulating PVC plastic, which includes the following parts by weight:

Preferably, the fatigue-resistant insulating PVC plastic, wherein the high molecular polymer includes 30-40wt% high-density polyethylene and 60-70wt% tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether Copolymer.

Preferably, in the fatigue-resistant insulating PVC plastic, the plasticizer includes 30-40 wt% ethyl heptafluorononanoate and 60-70 wt% trioctyl trimellitate.

Preferably, in the fatigue-resistant insulating PVC plastic, the stabilizer includes 60-70wt% calcium stearate and 30-40wt% heptafluorodecyltriethoxysilane.

Preferably, in the fatigue-resistant insulating PVC plastic, the filler includes 30-40 wt% silicon nitride and 60-70 wt% cordierite.

Preferably, in the fatigue-resistant insulating PVC plastic, the antioxidant includes 50-60 wt% cadmium dialkyldithiocarbamate and 40-50 wt% sulfobutyl β-cyclodextrin.

Preferably, in the fatigue-resistant insulating PVC plastic, the lubricant includes 30-40 wt% stearidonic acid and 60-70 wt% palmitic acid.

Preferably, in the fatigue-resistant insulating PVC plastic, the slip agent is propylene glycol fatty acid ester.

Preferably, the fatigue-resistant insulating PVC plastic, wherein the particle size of the silicon nitride and cordierite is 80-100 nm.

Preferably, the fatigue-resistant insulating PVC plastic, wherein the number average molecular weight of the polyvinyl chloride is 42,000-46,000 g/mol.

The beneficial effects of the present invention are:

(1) The fatigue-resistant insulating PVC plastic of the present invention improves the internal structure of the PVC plastic on a microscopic level by optimizing its chemical composition, and has excellent fatigue resistance and insulation properties.

(2) The present invention uses polyvinyl chloride as the main body. In this case, high-density polyethylene with good toughness and thermal stability and tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl ethylene with excellent fatigue resistance and excellent insulation performance are introduced into the main material. Base ether copolymer; the synergistic effect of calcium stearate and heptafluorodecyl triethoxysilane can improve its weather resistance and thermal stability; in order to obtain PVC with higher heat resistance, fatigue resistance and insulation properties Plastics. In this case, silicon nitride and cordierite that have synergistic heat resistance, fatigue resistance, and insulation properties were introduced; cadmium dialkyldithiocarbamate and sulfobutyl β-cyclodextrin have good properties with PVC plastics. The compatibility and compatibility of PVC plastics make the anti-oxidation performance of PVC plastics reach the best; through the addition of propylene glycol fatty acid esters, the mechanical agitation resistance and shear resistance of PVC plastics are enhanced.

detailed description

The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it with reference to the text of the description.

This case proposes a fatigue-resistant insulating PVC plastic, including the following parts by weight:

Polyvinyl chloride has the advantages of flame retardancy, high chemical resistance (resistant to concentrated hydrochloric acid, 90% sulfuric acid, 60% nitric acid and 20% sodium hydroxide), mechanical strength, and thermal stability. In order to compensate for these shortcomings, this case introduces high-density polyethylene with good toughness and thermal stability and tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl with excellent fatigue resistance and insulation properties in the main material. Vinyl ether copolymer.

As another embodiment of this case, the high molecular polymer includes 30-40 wt% high-density polyethylene and 60-70 wt% tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer.

As another embodiment of this case, the plasticizer includes 30-40 wt% ethyl heptafluoron-nonanoate and 60-70 wt% trioctyl trimellitate. The main function of plasticizers is to weaken the secondary bond between polymer molecules, increase the mobility of polymer molecular chains, and reduce the crystallinity of polymer molecular chains, that is, increase the plasticity of the polymer, which is represented by the polymer. Hardness, modulus, softening temperature and embrittlement temperature decrease, while elongation, flexibility and flexibility, the preferred plasticizer in this case is the synergistic effect of ethyl heptafluoron-nonanoate and trioctyl trimellitate .

As another embodiment of this case, the stabilizer includes 60-70 wt% calcium stearate and 30-40 wt% heptafluorodecyltriethoxysilane. The synergistic effect of calcium stearate and heptafluorodecyltriethoxysilane can improve its weather resistance and thermal stability.

As another embodiment of this case, the filler includes 30-40 wt% silicon nitride and 60-70 wt% cordierite. In order to obtain PVC plastics with higher heat resistance, fatigue resistance and insulation properties, this case has introduced silicon nitride and cordierite that have synergistic heat resistance, fatigue resistance and insulation properties. Among them, silicon nitride has Outstanding heat resistance and fatigue resistance, cordierite has excellent insulation properties.

As another embodiment of this case, the antioxidant includes 50-60 wt% cadmium dialkyldithiocarbamate and 40-50 wt% sulfobutyl β-cyclodextrin. Cadmium dialkyldithiocarbamate can eliminate peroxy radicals and alkoxy radicals, and can inhibit photodegradation; sulfobutyl β-cyclodextrin can improve the oxidation resistance and corrosion resistance of PVC plastics, dioxane Cadmium dithiocarbamate and sulfobutyl β-cyclodextrin have good compatibility and compatibility with PVC plastics, which makes the antioxidant performance of PVC plastics reach the best.

As another embodiment of the present case, the lubricant includes 30-40 wt% stearidonic acid and 60-70 wt% palmitic acid. The reason why the lubricant can play a lubricating effect is because it is added to reduce the friction of the plastic melt. Stearotrienoic acid and palmitic acid have good compatibility with the polymer, and it plays a role in reducing the polymerization inside the polymer. The role of cohesive force between molecules, thereby improving the internal friction heat generation of the plastic melt and the fluidity of the melt, reducing the friction.

As another embodiment of this case, the slip agent is a fatty acid ester of propylene glycol. By adding propylene glycol fatty acid esters, the mechanical stirring resistance and shear resistance of PVC plastics are enhanced.

As another example of this case, the particle size of silicon nitride and cordierite is 80-100 nm. The particle size range of silicon nitride and cordierite can make a good balance between heat resistance, fatigue resistance and insulation properties of PVC plastics. Therefore, the particle size range should be limited.

As another example of this case, the number average molecular weight of polyvinyl chloride is 42,000-46,000 g/mol. The number average molecular weight of polyvinyl chloride can affect the mechanical strength of PVC. Therefore, the number average molecular weight of polyvinyl chloride should be limited.

Specific examples and comparative examples are listed below:

Example 1:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 80 nm; the number average molecular weight of polyvinyl chloride is 42,000 g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Combine polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, stearidonic acid, palmitic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclopaste The precision is heated in a high-speed kneader for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluoron-nonanoate and trioctyl trimellitate are added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix evenly, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Example 2:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 90nm; the number average molecular weight of polyvinyl chloride is 45000g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Combine polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, stearidonic acid, palmitic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclopaste The precision is heated in a high-speed kneader for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluoron-nonanoate and trioctyl trimellitate are added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix evenly, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Example 3:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 100 nm; the number average molecular weight of polyvinyl chloride is 46000 g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Combine polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, stearidonic acid, palmitic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclopaste The precision is heated in a high-speed kneader for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluoron-nonanoate and trioctyl trimellitate are added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix evenly, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Comparative example 1:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 80 nm; the number average molecular weight of polyvinyl chloride is 42,000 g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Combine polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, stearidonic acid, palmitic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclopaste The precision is heated in a high-speed kneader for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluoron-nonanoate and trioctyl trimellitate are added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix well, then add high density polyethylene and propylene glycol fatty acid ester, and continue mixing at low speed 60 Seconds, when the material temperature reaches 100℃, the material can be discharged to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly used for extruding by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Comparative example 2:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 80 nm; the number average molecular weight of polyvinyl chloride is 42,000 g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Combine polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, stearidonic acid, palmitic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclopaste The precision is placed in a high-speed kneader and heated for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluoron-nonanoate is added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix evenly, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Comparative example 3:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 90nm; the number average molecular weight of polyvinyl chloride is 45000g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Put polyvinyl chloride, heptafluorodecyltriethoxysilane, octadecatrienoic acid, palmitic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclodextrin into high-speed kneading Heat in the machine for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluorononanoate and trioctyl trimellitate are added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix evenly, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Comparative example 4:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 90nm; the number average molecular weight of polyvinyl chloride is 45000g/mol.

Comparative Example 5:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 100 nm; the number average molecular weight of polyvinyl chloride is 46000 g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Put polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, stearyl trienoic acid, palmitic acid, and cadmium dialkyldithiocarbamate in a high-speed kneader for heating Low-speed mixing, the temperature of the high-speed kneader is controlled at 100-105℃, while adding ethyl heptafluoride n-nonanoate and trioctyl trimellitate to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix evenly, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

Comparative Example 6:

A fatigue-resistant insulating PVC plastic, including the following parts by weight:

The particle size of silicon nitride and cordierite is 100 nm; the number average molecular weight of polyvinyl chloride is 46000 g/mol.

Preparation method of fatigue-resistant insulating PVC plastic:

1) Put polyvinyl chloride, calcium stearate, heptafluorodecyltriethoxysilane, octadecatrienoic acid, cadmium dialkyldithiocarbamate, and sulfobutyl β-cyclodextrin Heat in the high-speed kneader for low-speed mixing. The temperature of the high-speed kneader is controlled at 100-105°C. At the same time, ethyl heptafluoron-nonanoate and trioctyl trimellitate are added to start high-speed mixing;

2) When mixing at high speed until the material temperature reaches 90℃, start low speed mixing again. In the case of low speed mixing, first add silicon nitride and cordierite and mix well, then add high density polyethylene, tetrafluoroethylene-hexafluoropropylene-full Fluoroalkyl vinyl ether copolymer and propylene glycol fatty acid ester are mixed at low speed for 60 seconds, and the material can be discharged when the material temperature reaches 100°C to obtain the mixed material;

3) The uniformly mixed raw materials in step 2) are directly extruded by a twin-screw extruder, the extrusion temperature is controlled to 140°C, and the extruded particles are dried to obtain fatigue-resistant insulating PVC plastic.

The performance test results of the embodiments and comparative examples are listed below:

It can be seen from the above examples that the obtained material not only has excellent high temperature performance, but also has better fatigue resistance and insulation performance than general materials.

Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. For those familiar with the field, it can easily Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to specific details.

Claims (10)

1. A fatigue-resistant insulating PVC plastic, characterized in that it comprises the following parts by weight:

   
2. The fatigue-resistant insulating PVC plastic according to claim 1, wherein the high molecular polymer comprises 30-40 wt% high-density polyethylene and 60-70 wt% tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl ethylene Base ether copolymer.
3. The fatigue-resistant insulating PVC plastic according to claim 2, wherein the plasticizer comprises 30-40 wt% ethyl heptafluorononanoate and 60-70 wt% trioctyl trimellitate.
4. The fatigue-resistant insulating PVC plastic according to claim 1, wherein the stabilizer comprises 60-70 wt% calcium stearate and 30-40 wt% heptafluorodecyltriethoxysilane.
5. The fatigue-resistant insulating PVC plastic according to claim 1 or 4, wherein the filler includes 30-40 wt% silicon nitride and 60-70 wt% cordierite.
6. The fatigue-resistant insulating PVC plastic according to claim 5, wherein the antioxidant comprises 50-60 wt% cadmium dialkyldithiocarbamate and 40-50 wt% sulfobutyl β-cyclodextrin.
7. The fatigue-resistant insulating PVC plastic according to claim 1, wherein the lubricant comprises 30-40 wt% stearidonic acid and 60-70 wt% palmitic acid.
8. The fatigue-resistant insulating PVC plastic according to claim 1, wherein the slip agent is propylene glycol fatty acid ester.
9. The fatigue-resistant insulating PVC plastic according to claim 5, wherein the particle size of the silicon nitride and cordierite is 80-100 nm.
10. The fatigue-resistant insulating PVC plastic according to claim 1, wherein the number average molecular weight of the polyvinyl chloride is 42,000-46,000 g/mol.