CN111269508A - Micro-crosslinked temperature-resistant polyvinyl chloride cable base material and preparation method thereof - Google Patents
Micro-crosslinked temperature-resistant polyvinyl chloride cable base material and preparation method thereof Download PDFInfo
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Abstract
The application relates to the technical field of polymer modification, in particular to a micro-crosslinked temperature-resistant polyvinyl chloride cable base material and a preparation method thereof. The polyvinyl chloride cable base material adopts the matching use of the phosphate flame retardant and the antimony flame retardant, and the matching use can play a better flame retardant effect due to different flame retardant mechanisms of the phosphate flame retardant and the antimony flame retardant, so that the using amount of the whole flame retardant is reduced, and the mechanical property of the material is improved. In addition, the phosphate flame retardant has a certain plasticizing effect on the polyvinyl chloride resin, can reduce the using amount of the plasticizer, and simultaneously forms a micro-crosslinking structure through a small amount of thiol crosslinking agent, thereby greatly improving the aging performance of the material under the high-temperature condition. The polyvinyl chloride cable base material obtained by the preparation method through ingenious formula design can reach the temperature resistance level of 125 ℃, and the raw materials adopted by the polyvinyl chloride cable base material are common commodity materials which can be directly purchased in the market, so that the polyvinyl chloride cable base material is low in production cost and has good economic benefits.
Description
Technical Field
The application relates to the technical field of polymer modification, in particular to a micro-crosslinked temperature-resistant polyvinyl chloride cable base material and a preparation method thereof.
Background
The electric wire and the cable are widely applied to human social activities such as industrial production, daily life, business activities and the like as basic media for electric energy transmission, and a giant network constructed by densely laying various electric wires and cables plays an irreplaceable important role in the modern human society. In China, the wire and cable industry is an important industry matching industry and plays an important irreplaceable role in an industrial system in China.
The conventional wire cable mainly comprises a conductor for transmitting electric energy and an insulating layer coated outside the conductor, and a shielding layer, a supplementary protective layer and the like can be arranged outside the insulating layer according to the situation. Among them, the insulating layer plays an important role of protecting the inner conductor and insulating the electricity. In the prior art, the conventional insulating layer is generally made of thermoplastic plastics such as polyvinyl chloride through modification, however, the heat-resistant grade of the polyvinyl chloride cable in the current market is generally only 70 ℃ or 90 ℃, the aging speed of the insulating layer of the cable can be greatly accelerated after long-term working at the temperature exceeding the heat-resistant grade, the specific characteristics are that the tensile property of the insulating layer is rapidly reduced, the insulating layer is easy to crack and break, the conductor is exposed in the air, and the normal use of the cable is influenced, the defect greatly limits the application scene of the polyvinyl chloride cable, and considering the excellent insulating property, corrosion resistance and lower cost of the polyvinyl chloride, how to improve the high-temperature resistance of the polyvinyl chloride matrix in the cable so as to improve the application range of the polyvinyl chloride cable is a research subject with practical significance
Disclosure of Invention
In order to solve the above problems, the present invention provides a technical content of the first aspect, and specifically relates to a micro-crosslinked temperature-resistant polyvinyl chloride cable base material, which comprises the following components in parts by mass: 30-40 parts of polyvinyl chloride, 0.05-0.2 part of thiol crosslinking agent, 0.5-1 part of acid-absorbing agent, 10-15 parts of plasticizer, 6-13 parts of flame retardant, 15-20 parts of filler, 3-5 parts of high temperature resistant stabilizer and 0.4-1 part of lubricant;
wherein, the polyvinyl chloride is used as a matrix resin material and is selected from one or a combination of SG-4 polyvinyl chloride, SG-3 polyvinyl chloride, SG-2 polyvinyl chloride and SG-1 polyvinyl chloride; the flame retardant comprises an organic phosphorus flame retardant and an antimony flame retardant, wherein the mass ratio of the organic phosphorus flame retardant to the antimony flame retardant is (5-10): (1-3); the organic phosphorus flame retardant is a phosphate flame retardant, the antimony flame retardant comprises antimony trioxide, and can be antimony trioxide alone or a combined flame retardant taking the antimony trioxide as a main body, and the plasticizer is required to resist high temperature, and is particularly characterized in that the flash point of the plasticizer is not lower than 250 ℃.
Optionally, the polyvinyl chloride is a composition of SG-3 polyvinyl chloride and SG-2 polyvinyl chloride according to a mass ratio of 3:1, and the modified polyvinyl chloride obtained by combining the resins has excellent comprehensive performance and relatively low cost.
Optionally, the plasticizer is one or a combination of trioctyl trimellitate and pentaerythritol ester, and can meet the requirement of high temperature resistance.
Optionally, the organic phosphorus flame retardant is one or a combination of triphenyl phosphate and trioctyl phosphate.
Optionally, the thiol crosslinking agent is one or a combination of 2-dibutylamine-4, 6-dithiol s-triazine, 2-dioctylamino-4, 6-dithiol s-triazine, 2-phenylamino-4, 6-dithiol s-triazine and 2,4, 6-trithiol s-triazine.
Optionally, the antimony flame retardant is a composition of antimony trioxide and zinc borate according to a mass ratio of 2:1, and the two materials can play a synergistic flame retardant role, so that the flame retardant effect is improved.
Optionally, the acid scavenger is magnesium oxide; the filler is a composition of calcium carbonate and magnesium hydroxide according to a mass ratio of 2: 1; the high-temperature resistant stabilizer is one or a composition of calcium stearate and zinc stearate; the lubricant is polyethylene wax, and the molecular weight of the polyethylene wax is not less than 3000.
The invention also provides the technical content of the second aspect, and in particular relates to a preparation method of a micro-crosslinked temperature-resistant polyvinyl chloride cable base material, wherein the preparation method adopts any one of the cable base material formulas in the technical content of the first aspect, and comprises the following steps:
1) mixing the raw materials except the cross-linking agent in proportion by using a high-speed mixer to obtain a mixture;
2) adding the mixture into an extruder at a constant speed, and simultaneously adding the cross-linking agent into the extruder at a constant speed according to a proportion;
3) all materials are mixed by a double-screw extruder and extruded and granulated by a single-screw extruder. .
Optionally, the mixing temperature reaches 95-100 ℃ or is mixed for 10 minutes to obtain a mixture; in the step 2), the cross-linking agent is added at a constant speed according to a certain proportion by a weighing scale.
Optionally, in the step 3), a double-stage extruder is used for extrusion, the temperature of the extrusion section is set to 80-90 ℃, 120-130 ℃, 155-165 ℃, 165-175 ℃, 165-170 ℃ in sequence from the material discharging section to the machine head, the screw rotation speed is 15-30 rpm, the specific process conditions can be flexibly set, the actual conditions are taken as the standard, and the extrusion temperature and the shearing effect are ensured as much as possible.
The polyvinyl chloride cable base material adopts a combined flame retardant of a phosphate flame retardant and an antimony flame retardant, and due to different flame retardant mechanisms of the phosphate flame retardant and the antimony flame retardant, the polyvinyl chloride cable base material can achieve a better flame retardant effect under the same dosage, so that the dosage of the whole flame retardant is reduced, and the mechanical property of the material is improved. More importantly, the phosphate flame retardant can play a certain plasticizing effect on the polyvinyl chloride resin, so that the consumption of other plasticizers is reduced, and the aging performance of the material under the high-temperature condition is improved. Through the proportion of design phosphate fire retardant, antimony system fire retardant and plasticizer, can promote the heat-resisting grade of material under the prerequisite of guaranteeing material mechanical properties and fire behaviour, it is concrete, this application polyvinyl chloride cable base material that preparation method obtained through ingenious formula design can reach 125 ℃ temperature resistant grade to satisfy other requirements of GB/T8815-2008 standard, and this application the raw materials that polyvinyl chloride cable base material adopted be the commodity material that can directly purchase on the market commonly, its manufacturing cost is lower, possesses better economic benefits.
In conclusion, the polyvinyl chloride cable base material has the following beneficial effects:
1) the dosage of the micromolecule plasticizer is low, so that the influence of the precipitation of the micromolecule plasticizer on the material in a long-time high-temperature working environment is reduced;
2) the composite function of the phosphate flame retardant reduces the comprehensive dosage of the flame retardant, and impacts the mechanical property of the material caused by low dosage of the plasticizer to a certain extent;
3) the material forms a micro-crosslinking structure through a small amount of thiol crosslinking agent, and the aging performance of the material under the high-temperature condition is greatly improved.
4) The cost is controllable, the production process is a common plastic modification process, and special materials, equipment and process settings are not needed, so that the method has better economy.
Detailed Description
The present solution is explained below with reference to specific embodiments.
According to the design of the invention, the polyvinyl chloride cable base material can reach a temperature-resistant grade of 125 ℃, simultaneously keeps better mechanical property, and integrally meets the standard requirement of GB/T8815-2008, so that the polyvinyl chloride cable base material is particularly suitable for cable materials which need to work for a long time in a higher temperature environment. The formula of the polyvinyl chloride cable base material comprises, by mass, 30-40 parts of polyvinyl chloride, 0.05-0.2 part of thiol crosslinking agent, 0.5-1 part of acid-absorbing agent, 10-15 parts of plasticizer, 6-13 parts of flame retardant, 15-20 parts of filler, 3-5 parts of high-temperature resistant stabilizer and 0.4-1 part of lubricant.
The polyvinyl chloride cable base material adopts conventional polyvinyl chloride as a matrix resin material, more specifically adopts one or a combination of SG-4 polyvinyl chloride, SG-3 polyvinyl chloride, SG-2 polyvinyl chloride and SG-1 polyvinyl chloride as the matrix resin, and considers that the relative hardness and the insulativity of SG-4 polyvinyl chloride are higher and the price and the processability of SG-1 polyvinyl chloride are relatively poorer in the polyvinyl chloride, so that the polyvinyl chloride cable base material preferably adopts one or a combination of SG-3 polyvinyl chloride and SG-2 polyvinyl chloride as the matrix resin material.
Particularly, the flame retardant of the polyvinyl chloride cable base material comprises an organic phosphorus flame retardant and an antimony flame retardant, the organic phosphorus flame retardant is a phosphate flame retardant, the compatibility of the phosphate flame retardant with polyvinyl chloride is very excellent, the polyvinyl chloride cable base material has a flame retardant function, and meanwhile, the polyvinyl chloride cable base material can play a certain plasticizing effect on PVC. The use of the phosphate flame retardant can reduce the consumption of other plasticizers as far as possible on the premise of ensuring the flame retardant effect, and the conventional plasticizer is volatile at high temperature, so that the lower plasticizer content is favorable for the stability of the polyvinyl chloride cable base material at high temperature, thereby improving the temperature resistance level of the polyvinyl chloride cable base material. In order to meet the overall flame retardant effect, the flame retardant also comprises an antimony flame retardant, wherein the antimony flame retardant comprises antimony trioxide, which can be antimony trioxide; or it may be a combination of antimony trioxide as the major material, such as a combination of antimony trioxide and zinc borate. The phosphate flame retardant and the antimony trioxide have different flame retardant mechanisms, and under the same total dosage, the phosphate flame retardant and the antimony trioxide are matched to use, so that the flame retardant effect is better than that of one flame retardant used alone, the integral dosage of the flame retardant can be reduced on the premise of ensuring the flame retardant effect by matching the phosphate flame retardant and the antimony flame retardant, and the mechanical property of the polyvinyl chloride cable base material is improved. Because the phosphate flame retardant plays a role in flame retardance and plasticization in the system of the polyvinyl chloride cable base material, the usage amount of the phosphate flame retardant is higher than that of the antimony flame retardant, and specifically, the mass ratio of the organic phosphorus flame retardant to the antimony flame retardant is (5-10): (1-3).
In order to improve the aging performance of the polyvinyl chloride cable base material under the high-temperature condition, the plasticizer adopts a high-temperature resistant plasticizer, the specific requirement is that the flash point of the plasticizer is not lower than 280 ℃, and the plasticizer can be one or a composition of trioctyl trimellitate and pentaerythritol ester. The crosslinking agent adopts a thiol crosslinking agent, the polyvinyl chloride cable base material adopts less thiol crosslinking agent, the crosslinking effect dosage of the thiol crosslinking agent on polyvinyl chloride is in positive correlation, the crosslinking degree of the polyvinyl chloride can be well controlled in a smaller range by adopting less thiol crosslinking agent, the material forms a micro-crosslinking structure by using a small amount of thiol crosslinking agent, the aging performance of the material under the high-temperature condition is greatly improved, and the polyvinyl chloride cable base material with the best comprehensive performance is obtained, wherein the thiol crosslinking agent can adopt one or the combination of 2-dibutylamine-4, 6-dithiol-triazine, 2-dioctylamino-4, 6-dithiol-triazine, 2-phenylamino-4, 6-dithiol-triazine and 2,4, 6-trithiol-Triazine (TCY) as the preferable choice, most preferably, the thiol crosslinking agent is 2-dibutylamine-4, 6-dithiol s-triazine, which is a commercially available crosslinking agent DB, in view of the combination of cost and crosslinking performance.
In addition, in the formula of the polyvinyl chloride cable base material, the acid absorbent is a conventional inorganic acid absorbent, preferably magnesium oxide; the filler is high-temperature resistant filler such as conventional calcium carbonate, magnesium hydroxide, calcium hydroxide, kaolin, talcum powder and the like, and preferably a composition of calcium carbonate and magnesium hydroxide is adopted; the high-temperature resistant stabilizer is a metal soap heat stabilizer, preferably one or a combination of zinc stearate and calcium stearate; the high-temperature-resistant lubricant is a nonpolar hydrocarbon lubricant, preferably polyethylene wax, which can improve the diffusibility of the filler and is beneficial to appearance and demolding of finished products, and more preferably polyethylene wax with the molecular weight of not less than 3000.
The polyvinyl chloride cable base material adopts a combined flame retardant of a phosphate flame retardant and an antimony flame retardant, and due to different flame retardant mechanisms of the phosphate flame retardant and the antimony flame retardant, the polyvinyl chloride cable base material can achieve a better flame retardant effect under the same dosage, so that the dosage of the whole flame retardant is reduced, and the mechanical property of the material is improved. More importantly, the phosphate flame retardant can play a certain plasticizing effect on the polyvinyl chloride resin, so that the consumption of other plasticizers is reduced, and the aging performance of the material under the high-temperature condition is improved. Through the proportion of design phosphate fire retardant, antimony system fire retardant and plasticizer, can promote the heat-resisting grade of material under the prerequisite of guaranteeing material mechanical properties and fire behaviour, it is concrete, this application polyvinyl chloride cable base material that preparation method obtained through ingenious formula design can reach 125 ℃ temperature resistant grade to satisfy other requirements of GB/T8815-2008 standard, and this application the raw materials that polyvinyl chloride cable base material adopted be the commodity material that can directly purchase on the market commonly, its manufacturing cost is lower, possesses better economic benefits.
The application also provides a preparation method for the polyvinyl chloride cable base material, and specifically, the formula of the polyvinyl chloride cable base material comprises the following steps:
1) mixing the raw materials except the cross-linking agent in proportion by using a high-speed mixer to obtain a mixture;
2) adding the mixture into an extruder at a constant speed, and simultaneously adding the cross-linking agent into the extruder at a constant speed according to a proportion;
3) all materials are mixed by a double-screw extruder and extruded and granulated by a single-screw extruder.
In order to ensure the mixing effect, preferably, in the step 1), the mixing temperature reaches 95-100 ℃ or is mixed for 10 minutes to obtain a mixture; the addition of the crosslinking agent in step 2) can be effected by means of conventional metering scales customary in the plastics modification industry, i.e.step 1) is mixed by means of a high-speed mixer and fed into an extruder, while the crosslinking agent is added homogeneously from the side by means of a metering scale, or else in a manner customary in the art. The extruder is a common single-screw extruder, a common double-screw extruder or a common double-stage extruder, preferably adopts a double-stage extruder, and in the preferred mode, the temperature of the extrusion section is set to be 80-90 ℃, 120-130 ℃, 155-165 ℃, 165-175 ℃ and 165-170 ℃ in sequence from the material discharge section to the machine head, and the rotating speed of the screw is 15-30 rpm.
The specific preparation method and properties of the modified polyvinyl chloride obtained by the preparation method described herein are illustrated by the following specific examples.
Example 1
The formula of the base material in the embodiment is as follows:
35 parts of polyvinyl chloride, 0.1 part of cross-linking agent, 0.7 part of acid-absorbing agent, 12.5 parts of plasticizer, 7.5 parts of phosphate flame retardant, 18 parts of filler, 2 parts of antimony flame retardant, 4 parts of high-temperature resistant stabilizer and 0.7 part of lubricant.
Wherein the polyvinyl chloride is a composition of SG-3 polyvinyl chloride (cannized) and SG-2 polyvinyl chloride (cannized) according to the mass ratio of 3:1, and the cross-linking agent is a common cross-linking agent DB (Wuhan double bond); the plasticizer is a composition of trioctyl trimellitate (magnesium cloud) and pentaerythritol ester (magnesium cloud) according to a mass ratio of 1: 1; the phosphate flame retardant is a composition of triphenyl phosphate (magnesium cloud) and trioctyl phosphate (magnesium cloud) according to a mass ratio of 1: 1; the flame retardant is prepared from antimony trioxide (Bier chemical industry) and zinc borate (Bier chemical industry) according to a mass ratio of 2: 1; the acid absorbent is magnesium oxide (ZH-V3L Zeshin chemical industry); the filler is a composition of calcium carbonate (Hengyi chemical industry) and magnesium hydroxide (Hengyi chemical industry) according to a mass ratio of 2: 1; the high-temperature resistant stabilizer is a composition of calcium stearate (Hengyi chemical industry) and zinc stearate (Hengyi chemical industry) according to a mass ratio of 1: 1; the high-temperature-resistant lubricant is polyethylene wax (Qingdao Sainuo) and the molecular weight of the polyvinyl chloride wax is 3000-4000.
Example 2
The formula of the base material in the embodiment is as follows:
40 parts of polyvinyl chloride, 0.05 part of cross-linking agent, 0.5 part of acid-absorbing agent, 10 parts of plasticizer, 5 parts of phosphate flame retardant, 15 parts of filler, 1 part of antimony flame retardant, 3 parts of high-temperature-resistant stabilizer and 0.4 part of lubricant.
Wherein the polyvinyl chloride adopts SG-3 polyvinyl chloride, and the cross-linking agent is a common cross-linking agent DB; the plasticizer is trioctyl trimellitate; the phosphate flame retardant is triphenyl phosphate; the flame retardant is antimony trioxide; the acid absorbent is magnesium oxide; the filler is a composition of calcium carbonate and magnesium hydroxide according to a mass ratio of 1: 1; the high-temperature resistant stabilizer is calcium stearate; the high-temperature-resistant lubricant is polyethylene wax, and the molecular weight of the polyvinyl chloride wax is 3000-4000.
Compared with example 1, the proportion of the resin usage in the whole usage is larger, and the usage of other materials such as the modifier, the filler and the like is smaller.
Example 3
The formula of the base material in the embodiment is as follows:
30 parts of polyvinyl chloride, 0.2 part of cross-linking agent, 1 part of acid-absorbing agent, 15 parts of plasticizer, 10 parts of phosphate flame retardant, 20 parts of filler, 3 parts of antimony flame retardant, 5 parts of high-temperature-resistant stabilizer and 1 part of lubricant.
Wherein the polyvinyl chloride adopts SG-2 polyvinyl chloride, and the cross-linking agent is a common cross-linking agent DB; the plasticizer is pentaerythritol ester; the phosphate flame retardant is trioctyl phosphate; the flame retardant is a composition of antimony trioxide and zinc borate according to a mass ratio of 2: 1; the acid absorbent is magnesium oxide; the filler is a composition of calcium carbonate and magnesium hydroxide according to a mass ratio of 2: 1; the high-temperature resistant stabilizer is zinc stearate; the high-temperature-resistant lubricant is polyethylene wax, and the molecular weight of the polyvinyl chloride wax is 3000-4000.
In this example, compared to example 1, the resin amount is smaller than the total amount, and other materials such as the modifier and the filler are used in a larger amount.
Comparative example 1
On the basis of example 1, this comparative example differs from example 1 in that: the amount of the plasticizer was 15 parts, the amount of the antimony flame retardant was 10 parts, and the rest of the settings were the same as in example 1.
Comparative example 2
On the basis of example 1, this comparative example differs from example 1 in that: an antimony-based flame-retardant plasticizer was not used as a supplement, and the amounts of the phosphate flame retardant and the plasticizer were 12 parts and 10 parts, respectively, and the other settings were the same as in example 1.
In the above examples and comparative examples, the same compositions were made from the same manufacturer and brand. The formulations described in the above examples and comparative examples were prepared by the following preparation method:
adopting common process setting in the modified plastic industry, namely arranging a mixing section at a second floor or a high floor, wherein the mixing section is provided with a high-speed mixer and a weighing scale, putting all the raw materials except a crosslinking agent into the high-speed mixer in proportion for mixing during one-time production, obtaining a mixture after the mixing temperature reaches 95-100 ℃ or mixing for 10 minutes, and uniformly feeding the mixture into an extruder; adding sufficient cross-linking agent into the weighing scale, and adding the cross-linking agent through automatic uniform blanking of the weighing scale. The method comprises the following steps of putting a mixture into an extruder, extruding a modified material by the extruder, carrying out water cooling, water blowing, cutting and granulating processes, and then putting the mixture into a homogenizing tank for homogenizing to finally prepare the homogenized modified polyvinyl chloride cable base material, wherein the extruder adopts a double-stage extruder (Jinwo JWP50/SJ100), the temperature of an extrusion section from a blanking section to a machine head is sequentially set to be 80-90 ℃, 120-130 ℃, 155-165 ℃, 165-175 ℃, 165-170 ℃ and the rotating speed of a screw is 15-30 rpm.
The polyvinyl chloride cable base materials described in the above examples and comparative examples were prepared by the above-mentioned process preparation method.
The polyvinyl chloride cable base materials obtained in the examples 1-3 and the comparative examples 1-2 are sampled, and standard sample strips are tested according to the standard GB/T8815-2008, wherein the aging test condition is 150 ℃ for 168h, and the final test results are as follows:
EXAMPLES example 1 example 2 example 3 comparative example 1 comparative example 2
From the data in the table, the maximum change rate of the tensile strength and the elongation at break of the polyvinyl chloride cable base material prepared by the preparation method disclosed by the application after aging for 168 hours at 150 ℃ is still within +/-20%, namely the maximum temperature grade of 125 ℃ can be reached, and the polyvinyl chloride cable base material also meets other performance requirements of the polyvinyl chloride cable base material. Of these, example 1 is the most excellent in overall performance and is a preferred embodiment of the present invention.
In conclusion, the polyvinyl chloride cable base material is suitable for being used as a cable material, particularly suitable for being used as a 125 ℃ temperature-resistant cable material in a higher working environment, and can be used as a cable material and a material for other purposes.
The same and similar parts among the various embodiments in the specification of the present application may be referred to each other. Especially, for the system and terminal embodiments, since the method therein is basically similar to the method embodiments, the description is relatively simple, and the relevant points can be referred to the description in the method embodiments.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Of course, the above description is not limited to the above examples, and technical features that are not described in this application may be implemented by or using the prior art, and are not described herein again; the above examples are only for illustrating the technical solutions of the present application and not for limiting the present application, and the present application is only described in detail with reference to the preferred embodiments, and those skilled in the art should understand that those skilled in the art should make changes, modifications, additions or substitutions within the spirit and scope of the present application without departing from the spirit of the present application and also fall within the scope of the claims of the present application.
Claims (10)
1. The micro-crosslinked temperature-resistant polyvinyl chloride cable base material is characterized by comprising the following components in parts by mass: 30-40 parts of polyvinyl chloride, 0.05-0.2 part of thiol crosslinking agent, 0.5-1 part of acid-absorbing agent, 10-15 parts of plasticizer, 6-13 parts of flame retardant, 15-20 parts of filler, 3-5 parts of high temperature resistant stabilizer and 0.4-1 part of lubricant;
the polyvinyl chloride is one or a combination of SG-4 polyvinyl chloride, SG-3 polyvinyl chloride, SG-2 polyvinyl chloride and SG-1 polyvinyl chloride; the flame retardant comprises an organic phosphorus flame retardant and an antimony flame retardant, wherein the mass ratio of the organic phosphorus flame retardant to the antimony flame retardant is (5-10): 1-3; the organic phosphorus flame retardant is phosphate flame retardant, the antimony flame retardant comprises antimony trioxide, and the flash point of the plasticizer is not lower than 250 ℃.
2. The cable binder according to claim 1, wherein the polyvinyl chloride is a composition of SG-3 polyvinyl chloride and SG-2 polyvinyl chloride in a mass ratio of 3: 1.
3. The cable binder according to claim 1, wherein the plasticizer is one or a combination of trioctyl trimellitate and pentaerythritol esters.
4. The cable base according to claim 1, wherein the organophosphorus flame retardant is one or a combination of triphenyl phosphate and trioctyl phosphate.
5. The cable base according to claim 1, wherein the thiol-based crosslinking agent is one or a combination of 2-dibutylamine-4, 6-dithiol-s-triazine, 2-dioctylamino-4, 6-dithiol-s-triazine, 2-phenylamino-4, 6-dithiol-s-triazine, and 2,4, 6-trithiol-s-triazine.
6. The cable binder according to claim 1, wherein the flame retardant is a composition of antimony trioxide and zinc borate in a mass ratio of 2: 1.
7. The cable binder according to claim 1, wherein the acid scavenger is magnesium oxide; the filler is a composition of calcium carbonate and magnesium hydroxide according to a mass ratio of 2: 1; the high-temperature resistant stabilizer is one or a composition of calcium stearate, zinc stearate, barium stearate and lead stearate; the lubricant is polyethylene wax, and the molecular weight of the polyethylene wax is not less than 3000.
8. A preparation method of a micro-crosslinked temperature-resistant polyvinyl chloride cable base material is characterized in that a formula of the cable base material according to claims 1-7 is adopted, and the preparation method comprises the following steps:
1) mixing the raw materials except the cross-linking agent in proportion by using a high-speed mixer to obtain a mixture;
2) adding the mixture into an extruder at a constant speed, and simultaneously adding the cross-linking agent into the extruder at a constant speed according to a proportion;
3) all materials are mixed by a double-screw extruder and extruded and granulated by a single-screw extruder.
9. The preparation method according to claim 8, wherein in the step 1), the mixing temperature reaches 95-100 ℃ or is mixed for 10 minutes to obtain a mixture; in the step 2), the cross-linking agent is added at a constant speed according to a certain proportion by a weighing scale.
10. The preparation method as claimed in claim 8, wherein in the step 3), a two-stage extruder is adopted for extrusion, the temperature of the upper-stage double-screw extrusion section is set to 80-90 ℃, 120-130 ℃, 155-165 ℃, 165-175 ℃ and 165-170 ℃ in sequence from the material feeding section to the machine head, the temperature of the lower-stage single screw is set to 140-160 ℃, and the screw rotation speed is 15-30 rpm.
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