阅读说明：本技术 一种受热不起泡的热缩套管及其制备方法 (Heat-shrinkable sleeve free of foaming when heated and preparation method thereof ) 是由 葛建平 于 2020-04-03 设计创作，主要内容包括：本发明公开了一种受热不起泡的热缩套管及其制备方法,具体而言,该热缩套管由经过电子加速器辐照的改性聚乙烯材料制备而成,按重量份数计,改性聚乙烯材料包含有以下组分：聚乙烯50-80份,丁二酸二异辛酯磺酸钠10-40份,无机阻燃剂15-20份,乙烯三元共聚物10-20份,增塑剂12-18份,稳定剂5-9份,敏化剂1-3份,纳米二氧化硅0.5-5份,炭黑1-8份,色母2-6份；本发明中其他原料中也使用了不包含ROHS指令中限制的物质的产品,采用新的配方所制作出的热缩套管性能并无任何降低,完全能够达到国际标准,并且其产品制备方法简单,材料价格低廉,适宜于产业化生产,是一种性价比优异的环保产品。(The invention discloses a heat-shrinkable sleeve tube without foaming under heating and a preparation method thereof, and particularly the heat-shrinkable sleeve tube is prepared from a modified polyethylene material irradiated by an electron accelerator, wherein the modified polyethylene material comprises the following components in parts by weight: 50-80 parts of polyethylene, 10-40 parts of diisooctyl succinate sodium sulfonate, 15-20 parts of an inorganic flame retardant, 10-20 parts of an ethylene terpolymer, 12-18 parts of a plasticizer, 5-9 parts of a stabilizer, 1-3 parts of a sensitizer, 0.5-5 parts of nano silicon dioxide, 1-8 parts of carbon black and 2-6 parts of a color master batch; the other raw materials in the invention also use products which do not contain substances limited in ROHS instruction, the performance of the heat-shrinkable tubing manufactured by adopting the new formula is not reduced at all, and can completely reach the international standard, and the product has simple preparation method and low material price, is suitable for industrialized production, and is an environment-friendly product with excellent cost performance.)

1. The heat-shrinkable sleeve which is not foamed when heated is prepared from a modified polyethylene material irradiated by an electron accelerator, and is characterized by comprising the following components in parts by weight: 50-80 parts of polyethylene, 10-40 parts of diisooctyl succinate sodium sulfonate, 15-20 parts of an inorganic flame retardant, 10-20 parts of an ethylene terpolymer, 12-18 parts of a plasticizer, 5-9 parts of a stabilizer, 1-3 parts of a sensitizer, 0.5-5 parts of nano silicon dioxide, 1-8 parts of carbon black and 2-6 parts of a color master batch.

2. The heat shrink sleeve of claim 1, wherein: the inorganic flame retardant is any one or two of zinc borate and activated kaolin.

3. The heat shrink sleeve of claim 1, wherein: the ethylene terpolymer is one or two of ethylene-vinyl acetate-carboxyl terpolymer and ethylene-n-butyl acrylate-carboxyl terpolymer.

4. The heat shrink sleeve of claim 1, wherein: the plasticizer is a adipic acid diester plasticizer.

5. The heat shrink sleeve of claim 1, wherein: the stabilizer is one or more of a rare earth stabilizer, a compound stabilizer formed by the rare earth stabilizer and calcium stearate or zinc stearate, and a stabilizer formed by the rare earth stabilizer and organic tin.

6. The heat shrink sleeve of claim 1, wherein: the sensitizer is one or two of trimethylolpropane trimethacrylate and trimethylolpropane triacrylate.

7. A method for preparing a heat shrinkable sleeve which does not blister under heat according to any of claims 1 to 6, wherein polyethylene, sodium diisooctyl succinate sulfonate, ethylene terpolymer, plasticizer, stabilizer, sensitizer, nanosilicon dioxide, carbon black and color master are first added and stirred in a stirrer, then inorganic flame retardant is added and stirred at high speed again, finally the uniformly mixed materials are added into a kneader and banburied, and a heat shrinkable master batch is prepared by a single screw granulator; the heat-shrinkable master batch is subjected to extrusion molding, irradiation molding by an electron accelerator, continuous expansion molding, atomization oiling on the inner wall of the heat-shrinkable master batch, and finally a finished product of the heat-shrinkable sleeve is prepared.

8. The method of making a heat shrink sleeve as described in claim 7 including the steps of: firstly, adding polyethylene, sodium diisooctyl succinate sulfonate, ethylene terpolymer, plasticizer, stabilizer, sensitizer, nano-silica, carbon black and color master batch, stirring in a stirrer, stirring for 3-5 minutes, adding inorganic flame retardant, then stirring at high speed again, finishing mixing when the mixing temperature reaches 60-70 ℃, finally adding the uniformly mixed materials into a kneader, banburying at 130-140 ℃ for 30-40min, and then preparing into heat-shrinkable master batch through a single-screw granulator; the heat-shrinkable master batch is subjected to extrusion molding, irradiation molding by an electron accelerator, continuous expansion molding, atomization oiling on the inner wall of the heat-shrinkable master batch, and finally a finished product of the heat-shrinkable sleeve is prepared.

Technical Field

The invention relates to the technical field of heat-shrinkable sleeves, in particular to a heat-shrinkable sleeve which does not bubble when heated and a preparation method thereof.

Background

The heat-shrinkable tubing has excellent flame-retardant and insulating properties and is widely applied to the fields of wire connection, welding spot protection, wire harness identification, resistance-capacitance insulation protection, metal pipe corrosion protection and the like.

Most of the available heat-shrinkable sleeves contain fire retardant, aluminium hydroxide and magnesium hydroxide are filled fire retardant, which release bound water when decomposed by heat, absorb a large amount of latent heat to reduce the surface temperature of the filled synthetic material in flame, and have the functions of inhibiting the decomposition of polymer and cooling the generated combustible gas, and the aluminium oxide and magnesium oxide generated by the decomposition are good fire-resistant materials, which can also help to improve the fire-resistant performance of the synthetic material, and the water vapor released by the aluminium hydroxide and the magnesium hydroxide can also be used as a smoke inhibitor. However, the dehydration temperature of aluminum hydroxide is about 300 ℃, the decomposition temperature of magnesium hydroxide when heated is 340-490 ℃, when aluminum hydroxide or magnesium hydroxide is used as the flame retardant of the heat shrinkable material, when the shrinkage temperature of the heat shrinkable material when heated by a spray gun or an oven is higher than the decomposition temperature of the aluminum hydroxide or magnesium hydroxide, gas is easily generated due to the decomposition of the flame retardant, the gas generated due to the decomposition of the flame retardant cannot be discharged from the inside of the insulating material, and finally, the insulating material is heated, particularly, the pipe wall of the insulating material is foamed and expanded when the heat shrinkable material is heated at high temperature, and is severely honeycombed, so that the insulating protection performance is lost.

Disclosure of Invention

Therefore, the invention provides a heat-shrinkable sleeve which does not bubble when heated and a preparation method thereof, and aims to solve the problems.

The technical scheme of the invention is as follows:

a heat-shrinkable sleeve which does not bubble when heated is prepared from a modified polyethylene material irradiated by an electron accelerator, and the modified polyethylene material comprises the following components in parts by weight: 50-80 parts of polyethylene, 10-40 parts of diisooctyl succinate sodium sulfonate, 15-20 parts of an inorganic flame retardant, 10-20 parts of an ethylene terpolymer, 12-18 parts of a plasticizer, 5-9 parts of a stabilizer, 1-3 parts of a sensitizer, 0.5-5 parts of nano silicon dioxide, 1-8 parts of carbon black and 2-6 parts of a color master batch.

In some embodiments, the inorganic flame retardant is any one or both of zinc borate, activated kaolin.

In some embodiments, the ethylene terpolymer is one or both of an ethylene-vinyl acetate-carboxyl terpolymer, an ethylene-n-butyl acrylate-carboxyl terpolymer.

In some embodiments, the plasticizer is a adipic diester plasticizer.

In some embodiments, the stabilizer is one or more of a rare earth stabilizer, a complex stabilizer formed by a rare earth stabilizer and calcium stearate or zinc stearate, and a stabilizer formed by a rare earth stabilizer and organotin complex.

In some embodiments, the sensitizer is one or both of trimethylolpropane trimethacrylate, trimethylolpropane triacrylate.

The invention also provides a preparation method of the environment-friendly flame-retardant heat-shrinkable sleeve, which comprises the steps of firstly adding polyethylene, sodium diisooctyl succinate sulfonate, ethylene terpolymer, plasticizer, stabilizer, sensitizer, nano-silica, carbon black and color master batch, stirring in a stirrer, then adding inorganic flame retardant, stirring at high speed again, finally adding the uniformly mixed materials into a kneader for banburying, and preparing a heat-shrinkable master batch by a single-screw granulator; the heat-shrinkable master batch is subjected to extrusion molding, irradiation molding by an electron accelerator, continuous expansion molding, atomization oiling on the inner wall of the heat-shrinkable master batch, and finally a finished product of the heat-shrinkable sleeve is prepared.

In some embodiments, the preparation method of the environment-friendly flame-retardant heat-shrinkable tubing specifically comprises the following steps: firstly, adding polyethylene, sodium diisooctyl succinate sulfonate, ethylene terpolymer, plasticizer, stabilizer, sensitizer, nano-silica, carbon black and color master batch, stirring in a stirrer, stirring for 3-5 minutes, adding inorganic flame retardant, then stirring at high speed again, finishing mixing when the mixing temperature reaches 60-70 ℃, finally adding the uniformly mixed materials into a kneader to mix for 30-40min at 130-140 ℃, and then preparing the heat-shrinkable master batch by a single-screw granulator; the heat-shrinkable master batch is subjected to extrusion molding, irradiation molding by an electron accelerator, continuous expansion molding, atomization oiling on the inner wall of the heat-shrinkable master batch, and finally a finished product of the heat-shrinkable sleeve is prepared.

The invention has the beneficial effects that: the raw materials of the invention do not use rubber materials any more, so as to avoid the rubber raw materials from being mixed with some heavy metals, such as: cadmium (Cd), lead (Pb), hexavalent chromium (Cr +6), mercury (Hg), etc., among other raw materials, products that do not contain the substances limited in the ROHS directive are also used, thus further reducing the content of the limiting substances in the final finished product; the performance of the heat-shrinkable sleeve manufactured by adopting the new formula is not reduced at all, magnesium hydroxide and aluminum hydroxide are not used in the flame-retardant material, and the phenomenon that the tube wall is easy to foam and form honeycomb foreign matters when the heat-shrinkable sleeve is heated and shrunk is avoided, so that the insulating performance of the insulating material is reduced; the foaming problem can be further solved by adding sodium diisooctyl succinate sulfonate, the heat-shrinkable sleeve product can completely reach the international standard, the preparation method of the product is simple, the raw materials are easy to obtain, the price is low, the heat-shrinkable sleeve is suitable for industrial production, and the heat-shrinkable sleeve is an environment-friendly product with excellent cost performance.

Detailed Description

The present invention will now be described in further detail, with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention, and is not intended to limit the invention to the specific embodiments illustrated. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.