阅读说明：本技术 一种超强改性聚氯乙烯电力管及其制备方法 (Superstrong modified polyvinyl chloride power tube and preparation method thereof ) 是由 陈毅明 章振华 裘杨燕 孙东华 王进 陈建 汤成群 于 2020-06-10 设计创作，主要内容包括：本发明涉及PVC电力管技术领域,尤其涉及一种超强改性聚氯乙烯电力管及其制备方法,所述超强改性聚氯乙烯电力管包括以下重量份的原料：PVC树脂60-90份、乙烯-醋酸乙烯共聚物20-30份、改性填料10-20份、热稳定剂2-4份、分散剂1.5-3.5份、润滑剂0.5-1.5份、硅烷偶联剂3-5份、增塑剂0.5-2份、抗氧化剂1-3份,从耐寒性、耐磨性、耐各种水质的腐蚀性的角度来解决PVC电力管在长期低温环境下的脆性、抗冲击性；在河底、海洋等复杂环境下的韧性、耐腐蚀性、耐水性的问题,使制得的PVC电力管具有更好的耐寒性、韧性、耐腐蚀性、耐水性和抗冲击性。(The invention relates to the technical field of PVC (polyvinyl chloride) power tubes, in particular to a super-strong modified polyvinyl chloride power tube and a preparation method thereof, wherein the super-strong modified polyvinyl chloride power tube comprises the following raw materials in parts by weight: 60-90 parts of PVC resin, 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of modified filler, 2-4 parts of heat stabilizer, 1.5-3.5 parts of dispersant, 0.5-1.5 parts of lubricant, 3-5 parts of silane coupling agent, 0.5-2 parts of plasticizer and 1-3 parts of antioxidant, and the brittleness and impact resistance of the PVC power pipe in a long-term low-temperature environment are solved from the aspects of cold resistance, wear resistance and corrosion resistance of various water qualities; the prepared PVC electric power pipe has better cold resistance, toughness, corrosion resistance, water resistance and impact resistance due to the problems of toughness, corrosion resistance and water resistance in complex environments such as river bottoms, oceans and the like.)

1. The super-strong modified polyvinyl chloride power tube is characterized by comprising the following raw materials in parts by weight: 60-90 parts of PVC resin, 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of modified filler, 2-4 parts of heat stabilizer, 1.5-3.5 parts of dispersant, 0.5-1.5 parts of lubricant, 3-5 parts of silane coupling agent, 0.5-2 parts of plasticizer and 1-3 parts of antioxidant.

2. The ultra-strong modified polyvinyl chloride power tube according to claim 1, comprising the following raw materials in parts by weight: 75 parts of PVC resin, 25 parts of ethylene-vinyl acetate copolymer, 15 parts of modified filler, 3 parts of heat stabilizer, 2.5 parts of dispersant, 1 part of lubricant, 4 parts of silane coupling agent, 1.3 parts of plasticizer and 2 parts of antioxidant.

3. The ultra-strong modified polyvinyl chloride power tube as claimed in claim 2, wherein the heat stabilizer is calcium zinc stabilizer, the lubricant is polyethylene wax, the plasticizer is epoxidized soybean oil, and the antioxidant is pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ].

4. The ultra-strong modified polyvinyl chloride power tube as claimed in claim 3, wherein the dispersant is at least one of triethylhexylphosphoric acid, sodium dodecyl sulfate, methylpentanol, cellulose derivative, and polyacrylamide.

5. The preparation method of the ultra-strong modified polyvinyl chloride electric power tube according to claim 4, wherein the preparation method comprises the following steps:

putting ethylene-vinyl acetate copolymer resin into a high-speed mixer, stirring for 5-10min at 70-90 ℃, adding modified filler, dispersant and silane coupling agent, continuing to stir for 20-40min, adding PVC resin, heat stabilizer, lubricant and antioxidant, stirring for 20-30min at 130-150 ℃, adding plasticizer, continuing to stir for 5-10min, stirring uniformly, transferring into a double-screw extruder, setting the temperature of a main machine at 170-.

6. The method for preparing a super-strong modified polyvinyl chloride electric power tube according to claim 5, wherein the method for preparing the modified filler comprises the following steps:

modified glass fiber: adding a silane coupling agent into 95 wt% of absolute ethyl alcohol, uniformly stirring, adding glass fiber, mechanically stirring for 12-24H at 40-50 ℃, and drying to obtain modified glass fiber;

modified mica powder: adding deionized water into high-quality mica powder, heating to 70 ℃, adding stearic acid, stirring uniformly, reacting for 3-5H, and drying to obtain modified mica powder;

modified filler: adding deionized water into modified mica powder, stirring to obtain a suspension, adding modified glass fiber, stirring uniformly, adding ammonium persulfate, reacting for 4-7H at 60-70 ℃, and vacuum drying to obtain a compound of the modified mica powder loaded by the modified glass fiber; placing the compound in a ball mill for ball milling to obtain a nano compound; adding dimethyl azodiisobutyrate into 95 wt% anhydrous ethanol, stirring uniformly, adding a nano composite, adding nano activated carbon, stirring uniformly, oscillating by ultrasonic waves for 3-5H, heating in a water bath at 70-90 ℃ for 5-8H, filtering, washing and drying to obtain the modified filler.

7. The method for preparing a super-strong modified polyvinyl chloride electric power tube according to claim 6, wherein in the preparation process of the modified glass fiber, the drying condition is drying for 2-3H at 110 ℃; in the preparation process of the modified mica powder, the drying condition is that the modified mica powder is dried for 2.5-4.5H at 120 ℃.

8. The method as claimed in claim 7, wherein the glass fiber is one or more of alkali-free glass fiber, medium alkali glass fiber and high alkali glass fiber.

9. The method for preparing a super-strong modified polyvinyl chloride power tube according to claim 8, wherein the inner layer of the modified filler is nano activated carbon, and the outer layer is a nano composite of modified mica powder loaded on modified glass fiber.

10. The method for preparing a super-strong modified polyvinyl chloride electric power tube according to claim 9, wherein the oscillation frequency of the ultrasonic wave is 15-40 Khz.

Technical Field

The invention relates to the technical field of PVC (polyvinyl chloride) power tubes, in particular to a super-strength modified polyvinyl chloride power tube and a preparation method thereof.

Background

With the continuous progress of science and technology, electric power gradually becomes an indispensable part of people, cables also become the only mode of electric power transmission, and PVC electric power pipe adopts modified polyvinyl chloride as main raw materials, does not need to dig a large amount of mud, dig earth and destroy the road surface, lays construction projects such as pipeline, cable in special districts such as road, railway, building, riverbed, etc. Compared with the traditional 'trenching and pipe burying method', the trenchless power pipe engineering is more suitable for the current environmental protection requirement, and the disturbing factors such as dust flying, traffic jam and the like caused by the traditional construction are eliminated, so that the technology can also lay pipelines in some areas which can not implement the trenching operation, such as historic site protection areas, downtown areas, crop and farmland protection areas, expressways, rivers, oceans and the like.

The PVC power pipe used in the current market has better insulativity, pressure resistance, impact resistance and installation performance, but the cold resistance is general, and in some cold regions, such as the Heilongjiang desert river, root river and other places, the PVC power pipe is at subzero temperature throughout the year, although the PVC power pipe can be used, the PVC power pipe is easy to become brittle and further damaged when being in the subzero temperature environment for a long time, and meanwhile, when the PVC power pipe meets laying work hours of river bottoms, oceans and the like, the PVC power pipe is easy to be impacted by sundries, abraded and corroded by water quality due to the complex laying environment and the environment change of the river bottoms and the oceans, so that the PVC power pipe can effectively protect the power cable only if the PVC power pipe has good cold resistance, wear resistance, toughness and corrosion resistance of various water qualities.

The invention discloses a preparation process of a PVC (polyvinyl chloride) -material-based wear-resistant power tube, which is disclosed by the Chinese patent application number of CN201910829286.7 and comprises the following raw materials in parts by weight: 20-25 parts of polyvinyl chloride resin, 7-10 parts of modified poly-p-phenylene terephthalamide fiber, 8-12 parts of modified polydimethylsiloxane, 6.5-9 parts of lubricant, 8-10 parts of flame retardant and 4.5-7 parts of plasticizer, the modified poly-p-phenylene terephthalamide fiber is added to improve the light stability of the fiber, so that when the wear-resistant power tube based on the PVC material receives illumination, the aromatic polyamide fiber in the material does not generate photochemical reaction, thereby ensuring the wear resistance of the PVC power tube, the modified polydimethylsiloxane is added to reduce the spontaneous volatility, and ensure that wear-resistant substances in the PVC power tube can not volatilize after long-time use, thereby further improving the wear resistance of the PVC power tube, but the cold resistance, the toughness and the corrosion resistance of various water qualities of the PVC power tube are not strong, when the PVC power pipe is applied to cold areas, river bottoms and oceans, the PVC power pipe is easily damaged, and the service life is shortened.

Disclosure of Invention

In view of the above, the present invention provides a super-strong modified PVC power pipe and a method for preparing the same, which solves the problems of brittleness and impact resistance of the PVC power pipe in a long-term low temperature environment from the viewpoints of cold resistance, wear resistance, and resistance to corrosion of various water qualities; the prepared PVC electric power pipe has better cold resistance, toughness, corrosion resistance, water resistance and impact resistance due to the problems of toughness, corrosion resistance and water resistance in complex environments such as river bottoms, oceans and the like.

The invention solves the technical problems by the following technical means:

the super-strong modified polyvinyl chloride power tube comprises the following raw materials in parts by weight: 60-90 parts of PVC resin, 20-30 parts of ethylene-vinyl acetate copolymer, 10-20 parts of modified filler, 2-4 parts of heat stabilizer, 1.5-3.5 parts of dispersant, 0.5-1.5 parts of lubricant, 3-5 parts of silane coupling agent, 0.5-2 parts of plasticizer and 1-3 parts of antioxidant.

The content of vinyl acetate in the ethylene-vinyl acetate copolymer is 5-14%, when the content of vinyl acetate in the ethylene-vinyl acetate copolymer is less than 20%, the ethylene-vinyl acetate copolymer can be used as a plastic product, and has good low-temperature resistance, corrosion resistance, impact toughness, environmental stress cracking resistance, water resistance, processability and earthquake resistance.

Further, the superstrong modified polyvinyl chloride power tube comprises the following raw materials in parts by weight: 75 parts of PVC resin, 25 parts of ethylene-vinyl acetate copolymer, 15 parts of modified filler, 3 parts of heat stabilizer, 2.5 parts of dispersant, 1 part of lubricant, 4 parts of silane coupling agent, 1.3 parts of plasticizer and 2 parts of antioxidant.

Further, the heat stabilizer is a calcium zinc stabilizer, the lubricant is polyethylene wax, the plasticizer is epoxidized soybean oil, and the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester.

Further, the dispersant is at least one of triethyl hexyl phosphoric acid, sodium dodecyl sulfate, methyl amyl alcohol, cellulose derivatives and polyacrylamide.

Further, the preparation method of the superstrong modified polyvinyl chloride power tube comprises the following steps:

putting ethylene-vinyl acetate copolymer resin into a high-speed mixer, stirring for 5-10min at 70-90 ℃, adding modified filler, dispersant and silane coupling agent, continuing to stir for 20-40min, adding PVC resin, heat stabilizer, lubricant and antioxidant, stirring for 20-30min at 130-150 ℃, adding plasticizer, continuing to stir for 5-10min, stirring uniformly, transferring into a double-screw extruder, setting the temperature of a main machine at 170-.

Further, the preparation method of the modified filler comprises the following steps:

modified glass fiber: adding a silane coupling agent into 95 wt% of absolute ethyl alcohol, uniformly stirring, adding glass fiber, mechanically stirring for 12-24H at 40-50 ℃, and drying to obtain modified glass fiber;

modified mica powder: adding deionized water into high-quality mica powder, heating to 70 ℃, adding stearic acid, stirring uniformly, reacting for 3-5H, and drying to obtain modified mica powder;

modified filler: adding deionized water into modified mica powder, stirring to obtain a suspension, adding modified glass fiber, stirring uniformly, adding ammonium persulfate, reacting for 4-7H at 60-70 ℃, and vacuum drying to obtain a compound of the modified mica powder loaded by the modified glass fiber; placing the compound in a ball mill for ball milling to obtain a nano compound; adding dimethyl azodiisobutyrate into 95 wt% anhydrous ethanol, stirring uniformly, adding a nano composite, adding nano activated carbon, stirring uniformly, oscillating by ultrasonic waves for 3-5H, heating in a water bath at 70-90 ℃ for 5-8H, filtering, washing and drying to obtain the modified filler.

The inner layer of the modified filler is nano activated carbon, the outer layer of the modified filler is a nano compound, the nano activated carbon has a microporous structure, the radius of micropores is less than 2nm, and the structure is formed by micro pores with different sizes, so that the nano activated carbon has a larger specific surface area, the nano compound can be loaded on the nano activated carbon more under the action of dimethyl azodiisobutyrate to obtain chemically modified nano activated carbon, and the nano activated carbon can adsorb the nano compound, so that the nano activated carbon not only has a chemically grafted nano compound, but also has a physically adsorbed nano compound, and the nano compound is loaded on the nano activated carbon more stably;

the modified glass fiber has good corrosion resistance and mechanical strength, the modified mica powder has good elasticity, toughness and corrosion resistance, the modified mica powder is loaded on the modified glass fiber and is ball-milled into a nano compound with the radius of 0.5-2nm by a ball mill, so that the nano compound has good elasticity, toughness, corrosion resistance and mechanical strength; the nano activated carbon is easy to agglomerate in resin, and the modified nano compound is loaded on the nano activated carbon, so that the agglomeration of the nano activated carbon is changed to a certain extent, the dispersity of the nano activated carbon is enhanced, the modified filler is easier to disperse, and the using amount of the dispersing agent is reduced, so that the phenomenon of fish eye collapse on the surface of the PVC power tube after long-term use is avoided, and the cold resistance, the impact strength, the toughness, the corrosion resistance and the water resistance of the PVC power tube are further improved.

Further, in the preparation process of the modified glass fiber, the drying conditions are as follows: drying at 110 deg.C for 2-3H; in the preparation process of the modified mica powder, the drying conditions are as follows: drying at 120 deg.C for 2.5-4.5H.

Further, the glass fiber is one or more of alkali-free glass fiber, medium-alkali glass fiber and high-alkali glass fiber.

Further, the inner layer of the modified filler is nano activated carbon, and the outer layer is a nano compound of modified mica powder loaded on the modified glass fiber.

Further, the oscillation frequency of the ultrasonic wave is 15 to 40 Khz.

According to the superstrong modified polyvinyl chloride electric power tube and the preparation method thereof, the EVA resin is added in the preparation method disclosed by the invention, so that the corrosion resistance, environmental stress cracking resistance, low temperature resistance and impact toughness of the PVC electric power tube can be enhanced, the modified filler is added, the modified filler has good elasticity, toughness, corrosion resistance, mechanical strength and heat resistance, and meanwhile, the EVA resin has good compatibility, so that the modified filler can be fully dispersed in the EVA resin to obtain a mixed raw material which has good cold resistance, toughness, corrosion resistance, water resistance, wear resistance and impact strength, and therefore, the prepared PVC electric power tube has good cold resistance, toughness, corrosion resistance, water resistance, wear resistance and impact strength.

Detailed Description