CN113943464A

CN113943464A - Self-rolling plastic and preparation process thereof

Info

Publication number: CN113943464A
Application number: CN202111020840.0A
Authority: CN
Inventors: 邵源鹏; 黄应敏; 胡超强; 邹科敏; 许翠珊; 杨航; 胡青云; 陈喜东; 冯泽华; 梁志豪; 高伟光; 严伟聪; 徐兆良; 游仿群; 徐加健; 徐秋燕; 陆松记; 刘冬够; 刘晓明; 张士欢
Original assignee: Guangzhou Panyu Cable Group Co Ltd
Current assignee: Guangzhou Panyu Cable Group Co Ltd
Priority date: 2021-09-01
Filing date: 2021-09-01
Publication date: 2022-01-18

Abstract

The invention discloses a self-rolling plastic and a preparation process thereof, which comprises the steps of mixing plastic particles and a flame retardant at a high temperature; after the material mixing is finished, extruding the mixture to a spiral integrated die through an extruder for forming, wherein the section of a discharge port of the spiral integrated die is of a spiral disc type structure; and cooling the formed self-rolling plastic to room temperature to obtain the self-rolling plastic. The invention also provides a self-rolling plastic. The preparation process of the self-rolling plastic adopts the spiral integrated die with the spiral disk type structure at the section of the discharge port for shaping, the process is simple, the applicability is strong, the prepared self-rolling plastic can keep the mechanical property for a long time, and the self-rolling plastic has strong self-rolling capability.

Description

Self-rolling plastic and preparation process thereof

Technical Field

The invention relates to a self-rolling plastic and a preparation process thereof, belonging to the technical field of preparation of self-rolling materials.

Background

In the case of using a device such as power transmission and electric appliances, it is necessary to use an electric wire, a cable, or the like as a wire. The wires and cables are disordered too much, the wires are exposed and the aging of the wires is easy to accelerate and the wires are damaged, so that in order to make the wires and the cables messy, the scattered wires and the cables are regular and relatively fixed, and meanwhile, the exposed wires and the exposed cables are protected, PVC pipes or other sleeves are often sleeved on the wires and the cables to coat and encapsulate the wires.

Once a circuit fault occurs to a packaged wire or cable, a sleeve is usually damaged to expose a fault point when maintenance is performed; when the wires and the cables which are used are coated, the sleeves need to be planed, and then the wires and the cables are packaged; damage to the casing accelerates damage to the casing and defeats the purpose of a long-term site. The open type pipeline can solve the problem, but because of the performance of the plastic, the open type plastic pipeline is easy to deform under high temperature or long-time aging, so that the opening is larger and larger, and the coating and closing effects on the cable and the electric wire are lost, therefore, a new sleeve and a preparation process are needed to be provided for the problem of deformation of the open type plastic pipeline.

Disclosure of Invention

In order to overcome the defects of the prior art, the first object of the invention is to provide a preparation process of self-rolling plastic, which improves the self-rolling performance of the plastic and realizes the self-rolling of the plastic. The preparation process is simple and has strong applicability, and the self-rolling plastic prepared by the preparation method has uniform self-rolling structure and obvious self-rolling effect.

The purpose of the invention can be achieved by adopting the following technical scheme:

the preparation process of the self-rolling plastic is characterized by comprising the following steps of:

melting and mixing 100 parts of plastic particles and 0.5-10 parts of flame retardant;

extruding the mixture to a spiral integrated die through an extruder and carrying out extrusion molding, wherein the cross section of a discharge port of the spiral integrated die is of a spiral disc type structure;

and then cooling to obtain the self-coiling plastic.

Preferably, the spiral integrated die with the cross section of the discharge port in a spiral disc structure comprises a first end part, a second end part and a middle spiral pipe, wherein the spiral integrated die is connected to two ends of the middle spiral pipe, the width of the inside of the spiral pipe gradually decreases from the middle spiral pipe to the top end of the first end part and the top end of the second end part, and the top ends of the first end part and the second end part are arc-shaped; the spiral number of turns of the spiral disc structure is two, the first end part is positioned on the outer ring, and the second end part is positioned on the inner ring.

Preferably, the gap spacing between the outer ring and the inner ring is equal.

Preferably, the plastic particles are one or a combination of PVC, PC, PE and PP.

Preferably, the plastic particles have the flame retardant in the proportion of 100:5, and the preferable proportion can ensure that the flame retardant effect of the plastic is obvious and the self-rolling performance lasts for a long time after the plastic is shaped.

Preferably, the flame retardant is one or more of an inorganic flame retardant and an organic flame retardant.

Preferably, the temperature in the mixing process is 130-230 ℃; the mixing time is 1min-2 min.

Preferably, the barrel temperature of the extruder is controlled at 160-180 ℃.

Preferably, the cooling can be air cooling or water cooling, and the air cooling and the water cooling can accelerate the cooling speed, so that the self-rolling plastic can be cooled and formed more quickly.

The second purpose of the invention is to provide a self-rolling plastic which can be prepared by adopting the preparation process.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention relates to a preparation process of self-rolling plastic, which comprises the steps of mixing plastic particles and a flame retardant at a high temperature, extruding the mixture into a spiral integrated mold, shaping by adopting the spiral integrated mold with a spiral disc type structure on the section of a discharge port, and cooling after vulcanization to obtain the self-rolling plastic. The self-rolling plastic with the double-ring spiral structure is obtained by selecting a spiral integrated mold with a spiral disk type structure for the section of the discharge port to be shaped. Plastics pass through the compounding with fire retardant, through extruding out the design, the cooling process, reasonable raw materials ratio and processing procedure make plastics can keep long-time from rolling up the performance to whole process is simple, and the suitability is strong.

2. The self-rolling plastic has a double-ring spiral structure, the difficulty of opening the self-rolling plastic in use cannot be obviously increased by the double-ring spiral structure, the self-rolling strength can be increased due to the resilience of the double rings in rolling, and meanwhile, the mechanical property of the self-rolling plastic can be ensured for a long time by selecting proper raw material proportion and a proper treatment process, so that the self-rolling plastic has stronger self-rolling capability.

Drawings

Fig. 1 is a schematic sectional structure view of a sizing die.

Wherein, 1, a first end part; 2. a second end portion; 3. a middle spiral tube.

Detailed Description

The invention will be further described with reference to the accompanying drawings and the detailed description below:

after injection molding, plastics tend to maintain a fixed shape and are less prone to active deformation. However, the opening of the plastic sleeve of the open roll type gradually becomes larger as the plastic ages, and the function of coating protection is gradually lost, so it is necessary to provide a plastic with strong self-rolling capability and a preparation method thereof to make the open plastic have strong self-rolling capability, overcome the influence of opening outward expansion, and better realize coating.

and then cooling to obtain the self-coiling plastic.

Wherein the compounding is accomplished in the compounding machine, adds the plastic granule in the compounding machine, and the fire retardant is mixed evenly. And extruding the mixture into a spiral integrated die by using an extruder for molding, and extruding to obtain the self-rolling plastic. The cross section of the spiral integrated die is of a spiral disc type structure, so that plastic can be shaped into a spiral coil type.

Preferably, as shown in fig. 1, the spiral integrated mold comprises a first end part 1, a second end part 3 and a middle spiral pipe 2, which are connected at two ends of the middle spiral pipe 3, and the thickness in the pipe gradually decreases from the middle spiral pipe 3 to the top end of the first end part 1 and the top end of the second end part 2, and the top ends of the first end part 1 and the second end part 2 are in a circular arc shape. The plastic is shaped into a spiral tube type through the spiral integrated mold, the width in the first end part 1 and the second end part 2 is gradually reduced, two end parts of the shaped plastic can be naturally rolled, and therefore the plastic has the self-rolling performance on the whole. Preferably, the first end portion 1 and the second end portion 2 are identical in structure.

Preferably, the spiral disc structure has two spiral turns, the first end part is positioned on the outer ring, and the second end part is positioned on the inner ring. The number of turns of the spiral is increased by two turns, so that the plastic obtained by shaping has a double-turn spiral structure, the double-turn spiral structure does not obviously increase the difficulty of opening the self-rolling plastic when in use, but increases the self-rolling strength due to the resilience of the double turns when in rolling,

preferably, the space intervals between the outer ring and the inner ring are equal, and the space intervals between the outer ring and the inner ring are equal, so that in the process that the thickness of the middle spiral tube 3 gradually decreases towards the top end of the first end part 1 and the top end of the second end part 2, the bending degree of the inner side arcs of the first end part 1 and the second end part 2 is larger than that of the outer side arcs, and the first end part 1 and the second end part 2 are naturally rolled inwards.

Preferably, the plastic particles are one or a combination of PVC, PC, PE and PP. PE polyethylene has excellent cold resistance, no polarity per se, excellent electrical insulation, chemical stability at room temperature, no influence of non-oxidizing acid, amine, salt and the like, and is difficult to dissolve by a solvent; PVC polyvinyl chloride has better tensile, bending, compression and impact resistance, and better electrical insulation performance, can be used as a low-frequency insulation material, and has good chemical stability; the PC polycarbonate has flame retardance, wear resistance, oxidation resistance, good electrical insulating capability and chemical resistance; PP polypropylene has good dielectric property and high-frequency insulation property and is not influenced by humidity, and common organic solvents such as acid, alkali and the like hardly play a role in the PP polypropylene. The plastic particles have good stability and insulating property, and are the components of the commonly used plastic sleeve. The plastic particles are properly selected, the plastic particles have better mechanical properties after being shaped at a certain temperature, and the self-rolling plastic can be kept to the maximum extent by combining the shaped shape of the self-rolling plastic.

Preferably, the flame retardant is one or more of an inorganic flame retardant and an organic flame retardant. Preferably, the flame retardant is one or more of an inorganic flame retardant and an organic flame retardant. The inorganic flame retardant may be: antimony-based flame retardants such as antimony oxide, aluminum hydroxide flame retardants, magnesium hydroxide flame retardants, phosphorus-containing flame retardants such as diphenyl phosphate of phosphoric acid esters, halogen-containing phosphate esters, boron-containing flame retardants, molybdenum-containing flame retardants, and the like, and organic flame retardants may be conventional flame retardants such as reactive bromine-containing flame retardants, bromine-containing flame retardants such as dibromoneopentyl alcohol, tribromoneopentyl alcohol, decabromodiphenyl ethane, brominated polystyrene, chlorine-based flame retardants, organic phosphorus-based flame retardants, and the like. The flame retardant has wide selection range and strong applicability, and does not increase excessive cost.

Preferably, the temperature in the mixing process is 150-230 ℃; the high-temperature mixing time is 1-2 min. The proper temperature is selected to ensure that the plastic particles can be softened and mixed uniformly, and the next step of re-molding can be carried out.

Preferably, the temperature of the screw cylinder of the extruder is controlled between 160 ℃ and 230 ℃, and the temperature of the die is controlled between 40 ℃ and 80 ℃.

Example 1

Mixing 100 parts of PVC particles and 0.5 part of aluminum hydroxide at 160 ℃ for 2 min; after the materials are uniformly mixed, extruding the mixture to a spiral integrated die with a spiral disc type structure through a plastic extruder for molding, wherein the temperature of a spiral cylinder of the extruder is controlled at 170 ℃, and the temperature of the spiral integrated die is 60 ℃; after the molding, the plastic is cooled by blowing air and cooled to room temperature to obtain the finished product of the self-rolling plastic. The shape of the obtained self-rolling plastic is consistent with that of a forming die, the plastic is naturally rolled in, the plastic can be automatically rolled to an initial state after an opening is opened for use, the gap distance between the spiral outer ring and the spiral inner ring is not obviously changed, and the automatic rolling performance is strong.

Example 2

Mixing 100 parts of PC particles and 5 parts of brominated polystyrene at 230 ℃; after the materials are mixed uniformly, the mixture is extruded to a spiral integrated die with a spiral disc type structure through a plastic extruder to be molded; the temperature of a screw cylinder of the extruder is controlled at 230 ℃, and the temperature of the screw integrated die is 80 ℃; after the molding, the plastic is cooled by blowing air and cooled to room temperature to obtain the finished product of the self-rolling plastic. The shape of the obtained self-rolling plastic is consistent with that of a forming die, the plastic is naturally rolled in, when the self-rolling plastic is used, the self-rolling plastic can be automatically rolled to an initial state after an opening is opened for use, the gap distance between the spiral outer ring and the spiral inner ring is not obviously changed, and the automatic rolling performance is strong.

Example 3

Mixing 100 parts of PP particles, 2.5 parts of antimony pentoxide and 2.5 parts of decabromodiphenylethane at 170 ℃; after the materials are mixed uniformly, the mixture is extruded to a spiral integrated die with a spiral disc type structure through a plastic extruder to be molded; the temperature of a screw cylinder of the extruder is controlled at 170 ℃, and the temperature of the screw integrated die is 40 ℃; and after forming, cooling by water, and cooling to room temperature to obtain the finished product self-rolling plastic. The shape of the obtained self-rolling plastic is consistent with that of a forming die, the plastic is naturally rolled, aging does not occur after long-time use and storage, the plastic can be automatically rolled to an initial state after an opening is opened for use during use, the gap distance between the spiral outer ring and the inner ring does not change obviously, and the automatic rolling performance is strong.

Example 4

Mixing 100 parts of PE particles and 2.5 parts of trioctyl phosphate at 150 ℃; after the materials are mixed uniformly, the mixture is extruded to a spiral integrated die with a spiral disc type structure through a plastic extruder to be molded; the temperature of a screw cylinder of the extruder is controlled at 160 ℃, and the temperature of the screw integrated die is 40 ℃; and after forming, cooling by water, and cooling to room temperature to obtain the finished product self-rolling plastic. The shape of the obtained self-rolling plastic is consistent with that of a forming die, the plastic is naturally rolled in, when the self-rolling plastic is used, the self-rolling plastic can be automatically rolled to an initial state after an opening is opened for use, the gap distance between the spiral outer ring and the spiral inner ring is not obviously changed, and the automatic rolling performance is strong.

Example 5

50 parts of PC/PE and 5 parts of magnesium hydroxide are mixed at a high temperature of 225 ℃; after the materials are mixed uniformly, the mixture is extruded to a spiral integrated die with a spiral disc type structure through a plastic extruder to be molded; the temperature of a screw cylinder of the extruder is controlled at 230 ℃, and the temperature of the screw integrated die is 80 ℃; and after forming, cooling by water, and cooling to room temperature to obtain the finished product self-rolling plastic. The shape of the obtained self-rolling plastic is consistent with that of a forming die, the plastic is naturally rolled, aging does not occur after long-time use and storage, the plastic can be automatically rolled to an initial state after an opening is opened for use during use, the gap distance between the spiral outer ring and the inner ring does not change obviously, and the automatic rolling performance is strong.

Example 6

Mixing 34 parts of PC particles, 33 parts of PE particles, 33 parts of PP particles and 4 parts of brominated polystyrene at a high temperature of 225 ℃; after the materials are mixed uniformly, the mixture is extruded to a spiral integrated die with a spiral disc type structure through a plastic extruder to be molded; the temperature of a screw cylinder of the extruder is controlled at 220 ℃, and the temperature of the screw integrated die is 65 ℃; and after forming, cooling by water, and cooling to room temperature to obtain the finished product self-rolling plastic. The shape of the obtained self-rolling plastic is consistent with that of a forming die, the plastic is naturally rolled, aging does not occur after long-time use and storage, the plastic can be automatically rolled to an initial state after an opening is opened for use during use, the gap distance between the spiral outer ring and the inner ring does not change obviously, and the automatic rolling performance is strong.

The second purpose of the invention is to provide a self-rolling plastic which can be prepared by adopting the preparation process. The self-rolling plastic prepared has a double-ring spiral structure, the double-ring spiral structure cannot obviously increase the difficulty of opening the self-rolling plastic in use, but can increase the self-rolling strength due to the resilience of the double rings in rolling, and meanwhile, the proper raw material proportion and the treatment process are selected to ensure that the self-rolling plastic can keep the mechanical property for a long time, so that the self-rolling plastic has stronger self-rolling capability.

Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.

Claims

1. A preparation process of self-rolling plastic is characterized by comprising the following steps: the method comprises the following steps:

s1, mixing 100 parts of plastic particles and 0.5-10 parts of flame retardant;

s2, after the mixing is finished, extruding the mixture to a spiral integrated mold through an extruder for molding to obtain molded self-rolling plastic, wherein the section of a discharge port of the spiral integrated mold is of a spiral disc type structure;

and S3, cooling the formed self-rolling plastic to obtain the self-rolling plastic.

2. The process for preparing a self-coiling plastic as claimed in claim 1, wherein: the cross section of the discharge port of the spiral integrated die is of a spiral disc type structure and comprises a first end part, a second end part and a middle spiral tube, the first end part and the second end part are connected to two ends of the middle spiral tube, the width in the middle spiral tube is gradually reduced from the middle spiral tube to the top end of the first end part and the top end of the second end part, and the top end of the first end part and the top end of the second end part are arc-shaped; the spiral structure is characterized in that the number of spiral turns of the spiral structure is two, the spiral structure is divided into an inner ring and an outer ring, the first end portion is located on the outer ring, and the second end portion is located on the inner ring.

3. A process for preparing a self-coiling plastic material as claimed in claim 2, characterized in that: and the gap space between the outer ring and the inner ring is equal.

4. A process for the preparation of a self-coiling plastic material as claimed in any one of claims 1 to 3, characterized in that: the plastic particles are one or a composition of more than two of PVC, PC, PE and PP.

5. The process for preparing a self-coiling plastic as claimed in claim 1, wherein: the part ratio of the flame retardant to the plastic particles is 100: 5.

6. The process for preparing a self-coiling plastic as claimed in claim 1, wherein: the flame retardant is one or two of an inorganic flame retardant and an organic flame retardant.

7. The process for preparing a self-coiling plastic as claimed in claim 1, wherein: in the step S1, the temperature of the mixed material is 130-230 ℃; the mixing time is 1min-2 min.

8. The process for preparing a self-coiling plastic as claimed in claim 1, wherein: in the step S2, the temperature of the screw barrel of the extruder is controlled to be 160-180 ℃.

9. The process for preparing a self-coiling plastic as claimed in claim 1, wherein: in the step S3, the cooling is air cooling or water cooling.

10. A self-coiling plastic material, characterized in that it is prepared by the process for preparing a self-coiling plastic material as claimed in any one of claims 1 to 9.