Low-density flame-retardant PP mesh cable filling rope and preparation method thereof

Abstract

The invention discloses a low-density flame-retardant PP mesh cable filling rope, and belongs to the technical field of filling rope processing. The technical problem that in the prior art, the flame retardant property of a PP net-shaped cable filling rope and the utilization rate of a foaming agent potassium bicarbonate need to be further improved is solved. The preparation method comprises the following steps: preparing modified polypropylene resin of which the side chain has a char-forming dehydration group, siloxane and a foaming agent, and preparing a foaming nucleating agent which takes amidated graphene oxide as a substrate material and is internally filled with mixed powder modified by an aluminate coupling agent in an intercalation manner, the foaming nucleating agent promotes heterogeneous nucleation of the modified polypropylene resin and releases gas at the same time, so that the density of the modified polypropylene resin material is reduced, the mechanical property of the modified polypropylene resin material is enhanced, and in the combustion process, the foaming nucleating agent is matched with functional groups of side chains of the modified polypropylene resin to improve the flame retardant property of the modified polypropylene resin material; finally, the wear-resistant, low-density, high-temperature-resistant and flame-retardant net-shaped PP filling rope is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of filling rope processing, and in particular to a low-density flame-retardant PP mesh cable filling rope and a preparation method thereof. Background Art

[0002] Since the 1960s, polypropylene materials have been introduced into the field of cable filling for the first time. During this period, the application of polypropylene was mainly limited to basic cable filling, the technology was relatively simple, and the performance of the material was relatively basic. In the 1980s, with the improvement of polypropylene materials and the development of production technology, the performance of PP mesh cable filling ropes has been significantly improved. At this stage, researchers have improved the weather resistance and mechanical strength of polypropylene materials by adding modifiers and optimizing production processes, making them more suitable for cable filling. At this time, PP mesh ropes began to gradually replace traditional materials and became an important cable filling option on the market. In recent years, with the advancement of technology and changes in market demand, the flame retardant properties and low density of polypropylene mesh cable filling ropes have been further optimized. Researchers have added various environmentally friendly flame retardants to polypropylene materials to improve their safety, and reduced the density through modification processes, enhancing the flexibility and installation convenience of cables.

[0003] Prior art CN105280288A discloses a bromine-based flame retardant filling rope and a method for making the same. The bromine-based flame retardant filling rope is made of PP fiber filaments torn into a mesh shape, and the components and mass percentages of the PP fiber filaments are as follows: 4-8% bromine-based flame retardant, 10-50% calcium carbonate, and 52-86% polypropylene material; a method for making the flame retardant filling rope is also disclosed. Bromine-based flame retardant is added to the flame retardant filling rope formula, and the flame retardant effect is good; calcium carbonate is added to reduce the cost, and the polypropylene body is used to replace other materials, reaching a flame retardant oxygen index of more than 28, with good flame retardancy, electrical insulation, thermal stability and softness, and increased environmental protection and flexibility; and after filling, the tightness is moderate, the core is round, and it is convenient for batch production, improves efficiency, and is conducive to wide promotion and application. It has a small specific gravity and low cost, and replaces the cable flame retardant filling glass fiber rope. The method provided by the present invention has a simple manufacturing process, is easy to produce, and has a high yield.

[0004] The invention achieves the purpose of improving the flame retardant performance of the filling rope by adding brominated flame retardants and calcium carbonate during the processing of polypropylene resin. However, this invention does not take into account the low compatibility of the organic material brominated flame retardant, polypropylene resin and the inorganic material calcium carbonate. Its flame retardant performance needs to be further improved through mixed processing, and the large amount of calcium carbonate components inside makes its softness need to be further improved. In addition, due to the high content of calcium carbonate inside, the internal cross-linking degree of the finally prepared filling rope is low, which further reduces its wear resistance.

[0005] In the prior art, most methods for reducing the density of polypropylene materials are foaming. Since inorganic materials are simple, easy to obtain and inexpensive, potassium bicarbonate or sodium bicarbonate is selected in the process of selecting a foaming agent. The carbon dioxide gas generated by the decomposition of the two at high temperature is used to foam the polypropylene resin. However, in the process of preparing low-density polypropylene materials, the carbonates generated by the decomposition of the two are rarely further utilized, such as "Modification of Sodium Bicarbonate and Its Effect on Foaming Behavior in Polyolefin Materials_Rhodan". The carbonate groups in the residual sodium carbonate have a high utilization value, such as through blending or modification to generate carbon dioxide gas during combustion, thereby enhancing the flame retardancy of the polypropylene resin.

[0006] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0007] The object of the present invention is to provide a low-density flame-retardant PP mesh cable filling rope and a preparation method thereof, so as to solve the technical problem that the flame-retardant performance of the PP mesh cable filling rope and the utilization rate of the foaming agent potassium bicarbonate need to be further improved in the prior art.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A low-density flame-retardant PP mesh cable filling rope, comprising the following raw material components in parts by weight: 80-100 parts of modified polypropylene resin, 5-10 parts of foaming nucleating agent, 10-20 parts of plasticizer, 2-5 parts of stabilizer, 0.5-2 parts of lubricant, and 0.5-1 parts of antioxidant;

[0010] The preparation method of the modified polypropylene resin is as follows: 3-5 parts of a char-forming foaming agent, 5-8 parts of 5-hexenyltrimethylsiloxane, 5-8 parts of 2-amino-4,6-divinyl-1,3,5-triazine, 0.3-0.5 parts of azobisisobutyronitrile and 30-40 parts of dimethyl sulfoxide are weighed by weight and added into a reaction kettle, the temperature of the reaction kettle is increased to 50-70°C, the reaction is kept warm for 2-4 hours, and the modified polypropylene resin is obtained by post-treatment.

[0011] The reaction equation for synthesizing modified polypropylene resin is:

[0012]

[0013] Where:

[0014] R2:

[0015] R3:

[0016] R4:

[0017] The reaction principle of synthesizing modified polypropylene resin is as follows: under the action of free radical initiator azobisisobutyronitrile, char-forming foaming agent, 5-hexenyltrimethylsiloxane and 2-amino-4,6-divinyl-1,3,5-triazine undergo free radical polymerization reaction to finally generate modified polypropylene resin.

[0018] Furthermore, the post-treatment includes: after the reactor is cooled to room temperature, the reaction liquid is added into a rotary evaporator with a water bath temperature of 80-100° C., and the reaction liquid is distilled under reduced pressure until no liquid is extracted to obtain a modified polypropylene resin.

[0019] Furthermore, the preparation method of the carbon-forming foaming agent is as follows: 8-10 parts of phosphated triazine derivatives, 1-2 parts of 4,6-hepten-2-one, 1-2 parts of 4,4,4-trifluorobutyraldehyde, 2-3 parts of γ-alumina and 30-40 parts of dimethyl sulfoxide are weighed by weight and added into a reactor, the temperature of the reactor is increased to 60-80°C, the reaction is kept warm for 2-3 hours, and the carbon-forming foaming agent is obtained by post-treatment.

[0020] The reaction equation for synthesizing the carbon foaming agent is:

[0021]

[0022] Where:

[0023] The reaction principle of synthesizing the carbon-forming foaming agent is: secondary amine, aldehyde and ketone with α-H react under acidic conditions, firstly generate imine cation in the reaction, and then react with the enol form of ketone to form CC bond, and prepare the carbon-forming foaming agent. Further, the post-treatment includes: after the reactor is cooled to room temperature, the reaction liquid is added to a rotary evaporator with a water bath temperature of 80-100°C, and the carbon-forming foaming agent is obtained by vacuum distillation until no liquid is extracted.

[0024] Furthermore, the preparation method of the phosphated triazine derivative is as follows: 5-8 parts of a hybrid triazine derivative, 2-4 parts of 2-(hydroxyphosphoryl)hydrazine acid, 0.1-0.3 parts of chloroplatinic acid and 40-50 parts of NN-dimethylformamide are weighed by weight and added into a reactor, the temperature of the reactor is increased to 40-50° C., the reaction is kept warm for 1-2 hours, and the phosphated triazine derivative is obtained by post-treatment.

[0025] The reaction equation for synthesizing phosphated triazine derivatives is:

[0026]

[0027] Where:

[0028] The reaction principle for synthesizing phosphotriazine derivatives is as follows: under the catalytic conditions of chloroplatinic acid, the phosphorus-hydrogen bond in 2-(hydroxyphosphoric acid)hydrazinic acid undergoes a phosphorus-hydrogen addition reaction, and reacts with the imine bond and carbon-carbon double bond in the hybrid triazine derivative, respectively, to finally obtain the phosphotriazine derivative.

[0029] Furthermore, the post-treatment includes: after the reactor is cooled to room temperature, the reaction liquid is added into a rotary evaporator with a water bath temperature of 80-100° C., and distilled under reduced pressure until no liquid is extracted to obtain a phosphorus triazine derivative.

[0030] Furthermore, the preparation method of the hybrid triazine derivative is as follows: 8-10 parts of aminated triazine derivatives, 3-5 parts of 4,4,4-trifluorobutyraldehyde, 1-2 parts of aluminum chloride and 40-50 parts of toluene are weighed and added into a reactor, the temperature of the reactor is increased to 40-50° C., the reaction is kept warm for 1-2 hours, and the hybrid triazine derivative is obtained by post-treatment.

[0031] The reaction equation for synthesizing hybrid triazine derivatives is:

[0032]

[0033] The reaction principle for synthesizing hybrid triazine derivatives is as follows: under the catalysis of Lewis acid, the primary and secondary amino groups in the aminated triazine derivatives act as nucleophiles to attack the carbonyl group in 4,4,4-trifluorobutyraldehyde, forming imino and enamino groups, respectively, and finally generating hybrid triazine derivatives.

[0034] Furthermore, the post-treatment includes: after the reactor is cooled to room temperature, the reaction liquid is added into a rotary evaporator with a water bath temperature of 80-100° C., and the mixture is distilled under reduced pressure until no liquid is extracted to obtain a hybrid triazine derivative.

[0035] Furthermore, the preparation method of the aminated triazine derivative is as follows: 5-8 parts of triazine derivative, 2-4 parts of 6-methylcytosine, 1-2 parts of sodium hydroxide powder and 30-40 parts of toluene are weighed and added into a reactor, the temperature of the reactor is increased to 70-80° C., the reaction is kept warm for 1-3 hours, and post-processed to obtain the aminated triazine derivative.

[0036] The reaction equation for synthesizing aminated triazine derivatives is:

[0037]

[0038] The principle of synthesizing aminated triazine derivatives is that the secondary amino group in 6-methylcytosine has much higher reactivity than the secondary amino group due to the ortho effect, so it preferentially reacts with the chlorine group in the triazine derivative to obtain the aminated triazine derivative.

[0039] Furthermore, the post-treatment includes: after the reaction kettle is cooled to room temperature, the reaction liquid is added into a rotary evaporator with a water bath temperature of 80-100° C., and the reaction liquid is distilled under reduced pressure until no liquid is extracted to obtain an aminated triazine derivative.

[0040] Furthermore, the preparation method of the triazine derivative is as follows: 3-5 parts of cyanuric chloride, 5-8 parts of 9,10-diaminophenanthrene, 1-2 parts of sodium hydroxide powder and 30-40 parts of toluene are weighed by weight and added into a reactor, the temperature of the reactor is increased to 40-50° C., the reaction is kept warm for 2-4 hours, and the triazine derivative is obtained by post-treatment.

[0041] The reaction equation for synthesizing triazine derivatives is:

[0042]

[0043] The reaction principle for synthesizing triazine derivatives is as follows: This reaction undergoes an SN2 Lewis acid-base reaction, and the amino group on 9,10-diaminophenanthrene attacks the carbon atom of electron-deficient cyanuric chloride to generate a long-chain structure, in which the reactivity of the three chlorine groups of cyanuric chloride varies greatly. The reaction temperature is controlled so that cyanuric chloride consumes only two chlorine groups, ultimately forming a triazine derivative.

[0044] Furthermore, the post-treatment includes: after the reactor is cooled to room temperature, the reaction liquid is added into a rotary evaporator with a water bath temperature of 80-100° C., and the mixture is distilled under reduced pressure until no liquid is extracted to obtain a triazine derivative.

[0045] Furthermore, the preparation method of the foaming nucleating agent is as follows: 20-30 parts of a modified foaming agent, 5-10 parts of N,N'-diaminoformamide, and 75-100 parts of NN-dimethylformamide are weighed by weight and added into a reactor, stirred at room temperature for 5-10 minutes, the temperature of the reactor is lowered to 0-5°C, 1-2 parts of 1-hydroxybenzotriazole, 1-2 parts of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 1-2 parts of N-methylmorpholine are added thereto, the reaction is kept warm for 1-2 hours, and post-processed to obtain the foaming nucleating agent.

[0046] The reaction equation of the foaming nucleating agent is:

[0047]

[0048] The reaction principle of the foaming nucleating agent is as follows: the oxidized graphene surface has a large number of active groups such as carboxyl groups. The carboxyl groups on the surface of the modified foaming agent and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride generate active intermediates, and the amino groups undergo nucleophilic attack to generate condensation products. Since the addition intermediates of the acid to carbodiimide in the first stage of the reaction are not stable, the addition of acylation catalysts 1-hydroxybenzotriamineazole and N-methylmorpholine makes the reaction stable and thorough, and finally an amidated polyurethane is obtained.

[0049] Furthermore, the post-treatment includes: after the temperature of the reactor is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, the filter cake is washed with deionized water for 3-5 times, and the filter cake is placed in a reactor at a temperature of 80° C. and vacuum dried until the precipitate is constant weight to obtain a foaming nucleating agent.

[0050] Furthermore, the preparation method of the modified foaming agent comprises the following steps:

[0051] A1. Weigh 5-8 parts of multilayer graphene and 50-60 parts of 98wt% sulfuric acid by weight and add them to a reactor at a temperature of 0-5°C. After stirring for 10-15 minutes, add 3-5 parts of sodium chlorate to the reactor. After the temperature of the reactor is maintained at 0-5°C and reacted for 2-4 hours, a saturated sodium hydroxide solution is used to adjust the pH of the reaction system to 7, and post-process to obtain oxidized multilayer graphene;

[0052] Reaction principle: Sulfuric acid provides an acidic environment and undergoes a partial sulfation reaction with graphene, making the structure of graphene more active and creating conditions for the oxidation reaction. Sodium chlorate will decompose to produce chloric acid and oxygen under acidic conditions. The strong oxidizing action of chloric acid can oxidize the carbon layer of graphene oxide to produce graphene oxide, which contains various oxygen functional groups, such as epoxy groups, carboxyl groups, hydroxyl groups, etc.

[0053] Furthermore, the post-treatment includes: after the temperature of the reactor is raised to room temperature, the reaction liquid is filtered to collect the filter cake, the filter cake is washed with deionized water for 3-5 times, and the filter cake is placed in a drying oven at a temperature of 80° C. and vacuum dried until the filter cake has a constant weight to obtain oxidized multilayer graphene.

[0054] A2, weigh 1-2 parts of aluminate coupling agent by weight and add them to a reactor, introduce nitrogen protection, raise the temperature of the reactor to 40-60°C, wait until the aluminate coupling agent is in a molten state, add 3-5 parts of potassium bicarbonate, 6-8 parts of ammonium bisulfate and 2-3 parts of calcium carbonate to the reactor, keep warm and stir for 15-20 minutes, and post-treat to obtain a mixed powder;

[0055] Furthermore, the post-treatment includes: after the temperature of the reactor is lowered to room temperature, the solid attachments on the inner surface of the reactor are collected, the solid attachments are placed in a grinder for crushing, and passed through a 600-mesh sieve to obtain a mixed powder.

[0056] A3. 8-10 parts of oxidized multilayer graphene, 20-24 parts of ethanol and 3-5 parts of mixed powder are weighed by weight and added into a reactor. After ultrasonication for 10-15 minutes at room temperature, the temperature of the reactor is raised to 30-50° C. and ultrasonication is performed for 20-30 minutes at a constant ultrasonic frequency of 20-40 kHz. The modified foaming agent is obtained by post-treatment.

[0057] Furthermore, the post-treatment includes: after the temperature of the reactor is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, and the filter cake is placed in a reactor at a temperature of 80° C. and vacuum dried until the filter cake has a constant weight to obtain a modified foaming agent.

[0058] Furthermore, the plasticizer is one or more of epoxy soybean oil, tri(2-ethylhexyl) phosphate and di(2-ethylhexyl) phthalate, the stabilizer is one or more of diester zinc stabilizer, calcium zinc heat stabilizer and lead-free calcium zinc stabilizer, the lubricant is one or more of magnesium stearate, calcium stearate, zinc stearate and polyethylene wax, and the antioxidant is one or more of butylated hydroxybenzoate, tri(3,5-di-tert-butyl-4-hydroxyphenyl) phosphate and 2,2'-methylenebis(6-tert-butyl-4-hydroxytoluene).

[0059] A method for preparing a low-density flame-retardant PP mesh cable filling rope comprises the following steps:

[0060] S1. uniformly mixing modified polypropylene resin, foaming nucleating agent, plasticizer, stabilizer, lubricant and antioxidant to obtain a mixture;

[0061] S2, adding the mixed material to a twin-screw extruder, the temperatures of the eight temperature sections of the twin-screw extruder from the feed port to the discharge port are 170°C, 175, 175°C, 180°C, 180°C, 190°C, 190°C, the main engine speed of the twin-screw extruder is 80-120rpm, the pressure is 100-150bar, and the polypropylene strips with a thickness of 2mm are obtained by melt extrusion;

[0062] S3, placing the polypropylene film in a stretching machine, setting the temperature of the stretching machine to 100-120°C, controlling the longitudinal stretch ratio to 4-6:1, and the transverse stretch ratio to 8-12:1, after the stretching is completed, transferring the film to a cooling system, setting the temperature of the cooling system to 20-40°C, cooling and molding for 1-2h, and obtaining a stretched film;

[0063] S4. Place the stretched film in a CNC cutting machine and cut it into long strips of film with a width of 50-100 mm. Transfer the long strips of film to a mesh opening machine, which is equipped with 20-30 needle rollers with a fine needle density of 6-8 needles / cm 2 The diameter of the fine needle is 0.25-0.50 mm. After the mesh is opened, a mesh filling rope precursor is obtained. The mesh filling rope precursor is placed in a stretching machine. The temperature of the stretching machine is set to 100-120°C and kept warm until the mesh filling rope does not shrink, thereby obtaining a mesh filling rope.

[0064] The present invention has the following beneficial effects:

[0065] 1. In the process of preparing a low-density flame-retardant PP mesh cable filling rope, the present invention first prepares a modified polypropylene resin, whose side chain has a carbon-forming dehydration group, siloxane and a foaming agent, and prepares a nucleating foaming agent, which uses graphene oxide as a base material, and has a large number of amide groups on the surface and inside of the graphene oxide, and a large number of calcium carbonate powder, potassium bicarbonate powder and ammonium bisulfate powder modified by an aluminate coupling agent are intercalated or filled; in the process of preparing the PP material, the silicon oxygen structure on the surface of the modified polypropylene resin is combined with a large number of active groups on the surface of the graphene oxide, and the metal salt powder modified by the aluminate coupling agent is also cross-linked with the modified polypropylene resin, thereby improving the amide structure on the surface of the foaming nucleating agent and the calcium carbonate to form a composite nucleating agent to make the modified polypropylene resin undergo heterogeneous nucleation. The heterogeneous nucleation improves the mechanical properties of the polypropylene resin and makes the foaming of the modified polypropylene resin more uniform and sufficient. Furthermore, as the temperature rises, the potassium bicarbonate in the foaming nucleating agent decomposes and generates carbon dioxide gas. The modified polypropylene resin begins to foam, and the melting point of the modified polypropylene resin is lowered by increasing the plasticizer content, and finally a low-density mesh PP filling rope is obtained through a series of physical processing; further, during the combustion of the obtained low-density mesh PP filling rope, as the temperature rises, the phosphate groups in the modified polypropylene resin side chains promote the dehydration reaction of the triazine structure, forming a molten carbonized layer while releasing water vapor, further, the ammonium bisulfate component in the foaming nucleating agent decomposes at high temperature to produce ammonia and sulfuric acid, sulfuric acid reacts with potassium bisulfate as a foaming agent to produce potassium carbonate and calcium carbonate as a nucleating agent to produce carbon dioxide gas, and the triazine ammonia structure in the polypropylene resin side chains further releases ammonia as the triazine structure is carbonized, and the ammonia and carbon dioxide gases released by the above reaction, while flame retardant, act as foaming gases to foam and expand the molten carbonized layer, further improving the flame retardant ability of the mesh PP filling rope, and finally a wear-resistant, low-density, high-temperature resistant and flame-retardant mesh PP filling rope is obtained.

[0066] 2. In the process of preparing the modified polypropylene resin, the present invention first prepares a triazine derivative, and a large number of benzene ring structures in the chain segment structure of the triazine derivative make the triazine derivative have extremely strong wear resistance and thermal stability, and the performance of the triazine ring is stable, and it is easy to form a carbon layer when burning. The tertiary nitrogen structure therein has excellent carbonization and foaming effects, and it provides a basis for improving the flame retardant performance as a carbonizing agent; further, the chlorine group in the triazine derivative is replaced by an amination reaction, and a large number of tertiary nitrogen structures are introduced while introducing functional amino groups, thereby further improving the flame retardant ability of the organic chain segment; further, a large number of fluorine groups are introduced by modifying the primary amino group, while further improving the thermal stability of the organic chain segment, and they react with the secondary amino group and the primary amino group introduced in the above-mentioned modification process, respectively, introducing ene-amine structures and carbon-nitrogen double bonds, respectively, providing a basis for further modification; further, by modifying the organic The chain segments are further phosphated. In the phosphating process of the present invention, 2-(hydroxyphosphoryl)hydrazine acid is selected as the phosphating substrate, which not only reacts with the carbon-nitrogen double bond generated in the above-mentioned modification process to introduce a secondary amino structure into the organic chain segment again, providing a functional group basis for further modification, but also reacts with the carbon-carbon double bond in the ene-amine structure to further introduce a phosphoric acid structure. The phosphoric acid structure serves as a dehydrating agent at high temperature, laying a foundation for improving the flame retardant performance of the organic chain segment; further, aldehydes and ketones undergo a chain extension reaction with the secondary amino group introduced in the phosphating process to introduce a fluorine group and a double bond into the organic chain segment again, and the high temperature resistance of the organic chain segment is further enhanced in advance. The latter provides a functional group basis for preparing a modified polypropylene resin, and a carbon-forming foaming agent is obtained through the above-mentioned modification process; finally, a modified polypropylene resin having a carbon-forming foaming agent, a siloxane and an amino group on the side chain is obtained through a free radical polymerization reaction.

[0067] 3. In the process of preparing the foaming nucleating agent of the present invention, multilayer graphene is first oxidized to obtain graphene oxide. The surface of the oxidized multilayer graphene has a large number of active groups, and its compatibility with other inorganic materials is further improved. Furthermore, calcium carbonate powder, potassium bicarbonate powder and sodium bisulfate powder are coated with an aluminate coupling agent. While improving their compatibility with graphene oxide and organic materials, the aluminate coupling agent increases the decomposition temperature of potassium bicarbonate and ammonium bisulfate and reduces the decomposition temperature range of potassium bicarbonate and ammonium bisulfate, thereby improving the uniformity of the foaming of the modified polypropylene resin. In the process of flame retardancy, ammonia generated by the decomposition of ammonium bisulfate promotes the foaming of the molten carbonized layer, thereby enhancing the flame retardancy of the carbonized layer, and the generated sulfuric acid reacts with calcium carbonate and sodium carbonate to generate carbon dioxide, thereby further improving the flame retardancy of the PP filling rope. Finally, the surface of the graphene oxide is modified to make it more stable while having the performance of a nucleating agent, thereby finally obtaining a foaming nucleating agent that reduces the density of the mesh PP rope during the preparation process and improves the flame retardancy of the mesh PP rope during the combustion process. DETAILED DESCRIPTION

[0068] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] The multilayer graphene used in the present invention was purchased from Chengdu Jiacai Technology Co., Ltd., with the product number JCMRGO; the polyethylene wax used in the present invention was purchased from Wuhan Xindongyi Chemical Co., Ltd., with the model number Q-18PE wax; the calcium zinc heat stabilizer used in the present invention was purchased from Qingdao Guangde New Materials Co., Ltd., with the product number GP-285.

[0070] Example 1

[0071] This embodiment provides a method for preparing an environmentally friendly and efficient lubricant for polyvinyl chloride, comprising the following steps:

[0072] S1. Preparation of modified polypropylene resin

[0073] 5.0 g of cyanuric chloride, 8.0 g of 9,10-diaminophenanthrene, 1.6 g of sodium hydroxide powder and 36.0 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 40° C. and the reaction was kept warm for 2 h. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 80° C. and distilled under reduced pressure until no liquid was produced, to obtain 12.4 g of a triazine derivative;

[0074] 11.2 g of a triazine derivative, 4.8 g of 6-methylcytosine, 2.4 g of sodium hydroxide powder and 57.6 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 70° C. and the reaction was kept warm for 1 hour. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 80° C. and distilled under reduced pressure until no liquid was produced, to obtain 15.6 g of an aminated triazine derivative;

[0075] 13.4 g of an aminated triazine derivative, 6.6 g of 4,4,4-trifluorobutyraldehyde, 1.7 g of aluminum chloride and 70.0 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 40° C. and the reaction was kept warm for 1 hour. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 80° C. and distilled under reduced pressure until no liquid was produced, to obtain 18.4 g of a hybrid triazine derivative;

[0076] 16.8 g of a hybrid triazine derivative, 7.2 g of 2-(hydroxyphosphoryl)hydrazine acid, 0.5 g of chloroplatinic acid and 9.6 g of N.N-dimethylformamide were weighed and added to a reactor. The temperature of the reactor was raised to 40° C. and the reaction was kept warm for 1 hour. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 80° C. and distilled under reduced pressure until no liquid was produced to obtain 23.6 g of a phosphorylated triazine derivative;

[0077] 20.0 g of a phosphorus triazine derivative, 2.5 g of 4,6-hepten-2-one, 2.5 g of 4,4,4-trifluorobutyraldehyde, 5.0 g of γ-alumina and 80.0 g of dimethyl sulfoxide were weighed and added to a reactor. The temperature of the reactor was raised to 60° C. and the reaction was kept warm for 2 hours. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 80° C. and distilled under reduced pressure until no liquid was produced, to obtain 24.2 g of a carbon-forming foaming agent.

[0078] 21.6 g of char-forming foaming agent, 43.2 g of 5-hexenyltrimethylsiloxane, 43.2 g of 2-amino-4,6-divinyl-1,3,5-triazine, 2.8 g of azobisisobutyronitrile and 252.0 g of dimethyl sulfoxide were weighed and added to the reactor. The temperature of the reactor was raised to 50°C and the reaction was kept warm for 2 hours. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 80°C, and distilled under reduced pressure until no liquid was produced to obtain 106.5 g of modified polypropylene resin.

[0079] S2. Preparation of foaming nucleating agent

[0080] 12.0 g of multilayer graphene and 75.0 g of 98 wt% sulfuric acid were weighed and added to a reactor at a temperature of 0° C. After being stirred for 10 min, 7.5 g of sodium chlorate was added to the reactor. The reactor temperature was kept at 0° C. for 2 h. A saturated sodium hydroxide solution was used to adjust the pH of the reaction system to 7. After the reactor temperature was raised to room temperature, the reaction liquid was filtered to collect the filter cake. The filter cake was washed 3 times with deionized water. The filter cake was placed in a drying oven at a temperature of 80° C. and vacuum dried until the filter cake had a constant weight, to obtain 12.2 g of oxidized multilayer graphene;

[0081] 0.4 g of aluminate coupling agent was weighed and added to a reactor. After nitrogen protection was introduced, the temperature of the reactor was raised to 40° C. After the aluminate coupling agent was in a molten state, 1.2 g of potassium bicarbonate, 2.4 g of ammonium bisulfate and 0.8 g of calcium carbonate were added to the reactor. The mixture was stirred for 15 min. After the temperature of the reactor was lowered to room temperature, the solid attachments on the inner surface of the reactor were collected, placed in a grinder and crushed, and passed through a 600-mesh sieve to obtain 4.5 g of mixed powder;

[0082] 10.0 g of oxidized multilayer graphene, 21.0 g of ethanol and 3.0 g of mixed powder were weighed and added to a reactor. After ultrasonic treatment at room temperature for 10 min, the temperature of the reactor was raised to 30°C and ultrasonic treatment was performed for 20 min. The ultrasonic frequency was always maintained at 20 kHz. After the temperature of the reactor was lowered to room temperature, the reaction liquid was filtered to collect the filter cake. The filter cake was placed in a reactor at 80°C and vacuum dried until the filter cake had a constant weight, to obtain 12.3 g of a modified foaming agent.

[0083] S3. Preparation of mesh filling rope

[0084] 90.0 g of modified polypropylene resin, 8.0 g of foaming nucleating agent, 16.0 g of tri(2-ethylhexyl)phosphate, 3.6 g of calcium zinc heat stabilizer, 1.6 g of polyethylene wax, and 0.8 g of butylated hydroxybenzoate were uniformly mixed to obtain a mixture;

[0085] The mixed material is added into a twin-screw extruder, the temperatures of the eight temperature sections of the twin-screw extruder from the feed port to the discharge port are 170°C, 175°C, 175°C, 180°C, 180°C, 190°C, and 190°C in sequence, the main engine speed of the twin-screw extruder is 80rpm, the pressure is 100bar, and a polypropylene film with a side length of 500mm and a thickness of 2mm is obtained by melt extrusion;

[0086] The polypropylene film was placed in a stretching machine, the temperature of the stretching machine was set to 120°C, the longitudinal stretching ratio was controlled to be 4:1, and the transverse stretching ratio was controlled to be 8:1. After the stretching was completed, the film was transferred to a cooling system, the temperature of the cooling system was set to 20°C, and the film was cooled and formed for 1 hour to obtain a stretched film;

[0087] The stretched film is placed in a CNC cutting machine and cut into a long film with a width of 50 mm. The long film is transferred to a mesh opening machine. The mesh opening machine is equipped with 20 needle rollers with a fine needle density of 6 needles / cm 2 The diameter of the fine needle is 0.25 mm. After the mesh is opened, a mesh filling rope precursor is obtained. The mesh filling rope precursor is placed in a stretching machine. The temperature of the stretching machine is set to 100°C and kept warm until the mesh filling rope does not shrink, thereby obtaining a mesh filling rope.

[0088] Example 2

[0089] This embodiment provides a method for preparing an environmentally friendly and efficient lubricant for polyvinyl chloride, comprising the following steps:

[0090] S1. Preparation of modified polypropylene resin

[0091] 4.0 g of cyanuric chloride, 8.0 g of 9,10-diaminophenanthrene, 1.5 g of sodium hydroxide powder and 35.0 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 50° C. and the reaction was kept warm for 4 hours. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 100° C. and distilled under reduced pressure until no liquid was produced, to obtain 11.2 g of a triazine derivative;

[0092] 10.5 g of a triazine derivative, 4.5 g of 6-methylcytosine, 1.5 g of sodium hydroxide powder and 52.5 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 80° C. and the reaction was kept warm for 3 hours. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 100° C. and distilled under reduced pressure until no liquid was produced, to obtain 14.4 g of an aminated triazine derivative;

[0093] 13.3 g of an aminated triazine derivative, 6.6 g of 4,4,4-trifluorobutyraldehyde, 2.0 g of aluminum chloride and 60.0 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 50° C. and the reaction was kept warm for 2 h. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 100° C. and distilled under reduced pressure until no liquid was produced, to obtain 19.6 g of a hybrid triazine derivative;

[0094] 18.0 g of a hybrid triazine derivative, 6.0 g of 2-(hydroxyphosphoryl)hydrazine acid, 0.6 g of chloroplatinic acid and 135.0 g of N.N-dimethylformamide were weighed and added to a reactor. The reactor temperature was raised to 50° C. and the reaction was kept warm for 2 h. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 100° C. and distilled under reduced pressure until no liquid was produced to obtain 23.6 g of a phosphorylated triazine derivative;

[0095] 21.4 g of a phosphorus triazine derivative, 5.3 g of 4,6-hepten-2-one, 5.3 g of 4,4,4-trifluorobutyraldehyde, 5.3 g of γ-alumina and 93.4 g of dimethyl sulfoxide were weighed and added to a reactor. The temperature of the reactor was raised to 80° C. and the reaction was kept warm for 3 hours. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 100° C. and distilled under reduced pressure until no liquid was produced, to obtain 30.5 g of a carbon-forming foaming agent;

[0096] 27.0 g of char-forming foaming agent, 36.0 g of 5-hexenyltrimethylsiloxane, 45.0 g of 2-amino-4,6-divinyl-1,3,5-triazine, 3.6 g of azobisisobutyronitrile and 275.0 g of dimethyl sulfoxide were weighed and added to the reactor. The temperature of the reactor was raised to 70°C and the reaction was kept warm for 4 hours. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 100°C, and distilled under reduced pressure until no liquid was produced to obtain 105.8 g of modified polypropylene resin.

[0097] S2. Preparation of foaming nucleating agent

[0098] 9.5 g of multilayer graphene and 81.0 g of 98 wt % sulfuric acid were weighed and added to a reactor at a temperature of 5 ° C. After stirring for 15 min, 6.0 g of sodium chlorate was added to the reactor. The temperature of the reactor was kept at 5 ° C. for 4 h. The pH of the reaction system was adjusted to 7 using a saturated sodium hydroxide solution. After the temperature of the reactor was raised to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 5 times with deionized water. The filter cake was placed in a drying oven at a temperature of 80 ° C. and vacuum dried until the filter cake had a constant weight, to obtain 9.8 g of oxidized multilayer graphene;

[0099] Weigh 0.6 g of aluminate coupling agent and add it to a reactor. After nitrogen protection is introduced, the temperature of the reactor is raised to 60° C. After the aluminate coupling agent is in a molten state, 1.2 g of potassium bicarbonate, 2.1 g of ammonium bisulfate and 0.6 g of calcium carbonate are added to the reactor. The mixture is stirred for 20 min at room temperature. After the temperature of the reactor is lowered to room temperature, the solid attachments on the inner surface of the reactor are collected, and the solid attachments are placed in a grinder and crushed. The solid attachments are sieved through a 600-mesh screen to obtain 4.2 g of mixed powder.

[0100] 8.4 g of oxidized multilayer graphene, 20.0 g of ethanol and 3.6 g of mixed powder were weighed and added to a reactor. After ultrasonication at room temperature for 15 min, the temperature of the reactor was raised to 50°C and ultrasonication was performed for 30 min. The ultrasonic frequency was always maintained at 40 kHz. After the temperature of the reactor was lowered to room temperature, the reaction liquid was filtered to collect the filter cake. The filter cake was placed in a reactor at a temperature of 80°C and vacuum dried until the filter cake had a constant weight. 11.2 g of a modified foaming agent was obtained.

[0101] S3. Preparation of mesh filling rope

[0102] 96.0 g of modified polypropylene resin, 10.0 g of foaming nucleating agent, 15.0 g of tri(2-ethylhexyl)phosphate, 3.6 g of calcium zinc heat stabilizer, 1.6 g of polyethylene wax, and 0.8 g of butylated hydroxybenzoate were uniformly mixed to obtain a mixture;

[0103] The mixed material is added into a twin-screw extruder, the temperatures of the eight temperature sections of the twin-screw extruder from the feed port to the discharge port are 170°C, 175°C, 175°C, 180°C, 180°C, 190°C, and 190°C, respectively, the main engine speed of the twin-screw extruder is 20rpm, the pressure is 150bar, and a polypropylene film with a side length of 500mm and a thickness of 2mm is obtained by melt extrusion;

[0104] The polypropylene film was placed in a stretching machine, the temperature of the stretching machine was set to 120°C, the longitudinal stretching ratio was controlled to be 6:1, and the transverse stretching ratio was controlled to be 12:1. After the stretching was completed, the film was transferred to a cooling system, the temperature of the cooling system was set to 40°C, and the film was cooled and formed for 2 hours to obtain a stretched film;

[0105] The stretched film is placed in a CNC cutting machine and cut into a long film with a width of 100 mm. The long film is transferred to a mesh opening machine. The mesh opening machine is equipped with 30 needle rollers with a fine needle density of 8 needles / cm 2 The diameter of the fine needle is 0.50 mm. After the mesh is opened, a mesh filling rope precursor is obtained. The mesh filling rope precursor is placed in a stretching machine. The temperature of the stretching machine is set to 120°C and kept warm until the mesh filling rope does not shrink, thereby obtaining a mesh filling rope.

[0106] Example 3

[0107] This embodiment provides a method for preparing an environmentally friendly and efficient lubricant for polyvinyl chloride, comprising the following steps:

[0108] S1. Preparation of modified polypropylene resin

[0109] 6.0 g of cyanuric chloride, 9.0 g of 9,10-diaminophenanthrene, 1.5 g of sodium hydroxide powder and 52.5 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 45° C. and the reaction was kept warm for 3 hours. After the reactor was cooled to room temperature, 52.5 g of the reaction solution was added to a rotary evaporator with a water bath temperature of 90° C. and distilled under reduced pressure until no liquid was produced to obtain 14.4 g of a triazine derivative;

[0110] 13.6 g of a triazine derivative, 3.4 g of 6-methylcytosine, 1.8 g of sodium hydroxide powder and 48.0 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 75° C. and the reaction was kept warm for 2 h. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 90° C. and distilled under reduced pressure until no liquid was produced, to obtain 15.6 g of an aminated triazine derivative;

[0111] 13.5 g of an aminated triazine derivative, 4.5 g of 4,4,4-trifluorobutyraldehyde, 1.5 g of aluminum chloride and 67.5 g of toluene were weighed and added to a reactor. The temperature of the reactor was raised to 45° C. and the reaction was kept warm for 2 h. After the reactor was cooled to room temperature, the reaction liquid was added to a rotary evaporator with a water bath temperature of 90° C. and distilled under reduced pressure until no liquid was produced to obtain 16.4 g of a hybrid triazine derivative;

[0112] 15.6 g of a hybrid triazine derivative, 10.4 g of 2-(hydroxyphosphoryl)hydrazine acid, 0.7 g of chloroplatinic acid and 104.0 g of N.N-dimethylformamide were weighed and added to a reactor. The temperature of the reactor was raised to 45° C. and the reaction was kept warm for 2 h. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 90° C. and distilled under reduced pressure until no liquid was produced to obtain 24.3 g of a phosphorylated triazine derivative;

[0113] 19.2 g of a phosphorus triazine derivative, 2.4 g of 4,6-hepten-2-one, 2.4 g of 4,4,4-trifluorobutyraldehyde, 4.8 g of γ-alumina and 84.0 g of dimethyl sulfoxide were weighed and added to a reactor. The temperature of the reactor was raised to 70° C. and the reaction was kept warm for 3 hours. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 90° C. and distilled under reduced pressure until no liquid was produced, to obtain 23.5 g of a carbon-forming foaming agent.

[0114] 22.2 g of char-forming foaming agent, 44.3 g of 5-hexenyltrimethylsiloxane, 51.7 g of 2-amino-4,6-divinyl-1,3,5-triazine, 2.3 g of azobisisobutyronitrile and 265.0 g of dimethyl sulfoxide were weighed and added to the reactor. The temperature of the reactor was raised to 60°C and the reaction was kept warm for 3 hours. After the reactor was cooled to room temperature, the reaction solution was added to a rotary evaporator with a water bath temperature of 90°C, and distilled under reduced pressure until no liquid was produced to obtain 115.3 g of modified polypropylene resin.

[0115] S2. Preparation of foaming nucleating agent

[0116] 11.0 g of multilayer graphene and 110.0 g of 98 wt % sulfuric acid were weighed and added to a reactor at a temperature of 3 ° C. After stirring for 15 min, 6.6 g of sodium chlorate was added to the reactor. The temperature of the reactor was kept at 3 ° C. for 3 h. The pH of the reaction system was adjusted to 7 using a saturated sodium hydroxide solution. After the temperature of the reactor was raised to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 4 times with deionized water. The filter cake was placed in a drying oven at a temperature of 80 ° C. and vacuum dried until the filter cake had a constant weight, to obtain 11.3 g of oxidized multilayer graphene;

[0117] 0.8 g of aluminate coupling agent was weighed and added to a reactor. After nitrogen protection was introduced, the temperature of the reactor was raised to 50° C. After the aluminate coupling agent was in a molten state, 1.2 g of potassium bicarbonate, 2.3 g of ammonium bisulfate and 0.8 g of calcium carbonate were added to the reactor. The mixture was stirred for 18 min. After the temperature of the reactor was lowered to room temperature, the solid attachments on the inner surface of the reactor were collected, placed in a grinder and crushed, and passed through a 600-mesh sieve to obtain 4.5 g of mixed powder;

[0118] 10.0 g of oxidized multilayer graphene, 420.0 g of ethanol and 4.0 g of mixed powder were weighed and added to a reactor. After ultrasonic treatment at room temperature for 15 min, the temperature of the reactor was raised to 40°C and ultrasonic treatment was performed for 25 min. The ultrasonic frequency was always maintained at 30 kHz. After the temperature of the reactor was lowered to room temperature, the reaction liquid was filtered to collect the filter cake. The filter cake was placed in a reactor at a temperature of 80°C and vacuum dried until the filter cake had a constant weight, to obtain 12.5 g of a modified foaming agent.

[0119] S3. Preparation of mesh filling rope

[0120] 95.0 g of modified polypropylene resin, 8.0 g of foaming nucleating agent, 16.0 g of tri(2-ethylhexyl)phosphate, 2.4 g of calcium zinc heat stabilizer, 1.2 g of polyethylene wax, and 0.8 g of butylated hydroxybenzoate were uniformly mixed to obtain a mixture;

[0121] The mixed material is added into a twin-screw extruder, the temperatures of the eight temperature sections of the twin-screw extruder from the feed port to the discharge port are 170°C, 175°C, 175°C, 180°C, 180°C, 190°C, and 190°C, respectively, the main engine speed of the twin-screw extruder is 100 rpm, the pressure is 125 bar, and a polypropylene film with a side length of 500 mm and a thickness of 2 mm is obtained by melt extrusion;

[0122] The polypropylene film was placed in a stretching machine, the temperature of the stretching machine was set to 110°C, the longitudinal stretching ratio was controlled to be 5:1, and the transverse stretching ratio was controlled to be 10:1. After the stretching was completed, the film was transferred to a cooling system, the temperature of the cooling system was set to 30°C, and the film was cooled and formed for 2 hours to obtain a stretched film;

[0123] The stretched film is placed in a CNC cutting machine and cut into a long film with a width of 75 mm. The long film is transferred to a mesh opening machine. The mesh opening machine is equipped with 25 needle rollers with a fine needle density of 7 needles / cm 2 The diameter of the fine needle is 0.40 mm. After the mesh is opened, a mesh filling rope precursor is obtained. The mesh filling rope precursor is placed in a stretching machine. The temperature of the stretching machine is set to 110°C and kept warm until the mesh filling rope does not shrink, thereby obtaining a mesh filling rope.

[0124] Comparative Example 1

[0125] The difference between this comparative example and Example 3 is that step S1 is omitted and homopolymerized polypropylene resin is used instead of modified polypropylene resin.

[0126] Comparative Example 2

[0127] The difference between this comparative example and Example 3 is that in the process of preparing the mixed powder in step S2, an equal amount of calcium carbonate is used to replace ammonium bisulfate.

[0128] Comparative Example 3

[0129] The difference between this comparative example and Example 3 is that step S2 is eliminated and an equal amount of potassium bicarbonate is used to replace the foaming nucleating agent.

[0130] Performance Test:

[0131] The wear resistance, combustion performance, flame retardant performance, density and high temperature resistance of the PP mesh cable filling ropes prepared in Examples 1-3 and Comparative Examples 1-3 were tested:

[0132] The wear resistance of the filling rope is tested with reference to the standard GB / T 17737.324-2018 "Coaxial communication cable Part 1-324: Mechanical test method Cable wear resistance test";

[0133] Combustion performance: The limiting oxygen index of the filling rope is tested according to the standard GB / T 2406.2-2009 "Determination of combustion behavior of plastics by oxygen index method Part 2: Room temperature test";

[0134] The flame retardant performance refers to the standard GB / T 2408-2021 "Horizontal and vertical methods for the determination of the combustion performance of plastics" to determine the vertical combustion grade of the filling rope;

[0135] Density: The density of the filling rope is determined according to the standard GB / T 1033.2-2010 "Determination of density of non-foamed plastics Part 2: Density gradient column method";

[0136] The high temperature resistance performance refers to the standard GB / T 2951.42-2008 "General test methods for insulation and sheath materials of electric and optical cables Part 42: Special test methods for polyethylene and polypropylene mixtures Tensile strength and elongation test after high temperature treatment Winding test after high temperature treatment Winding test after air heat aging Determination of mass increase Long-term thermal stability test Copper catalytic oxidation degradation test method" to measure the softness of the filling rope after 160℃ high temperature treatment for 120h and the cracking of the filling rope after 120℃ insulation treatment for 36 days. The specific results are shown in Table 1.

[0137] Table 1-Test data table of each test sample

[0138]

[0139] Data Analysis:

[0140] Comparing and analyzing the data in Table 1 above, the PP mesh cable filling rope prepared by the present invention has a blade scraping resistance of 108 times, a limiting oxygen index of 39.3%, a vertical combustion grade of V-0, and a density of 0.82652 g·cm -3, after being treated at 160℃ for 120h, the number of windings is 8 times, and after being treated at 120℃ for 36 days, there is no cracking, and all performances are better than the comparative example. It is explained that the present invention prepares a modified polypropylene resin with a carbon-forming dehydration group, siloxane and a foaming agent in the side chain, and a graphene oxide with a large number of amide groups on the surface and inside and modified mixed powder by intercalation or filling as a foaming nucleating agent. During the preparation process, the foaming nucleating agent foams and reduces the density of the modified polypropylene resin during the heterogeneous nucleation process of the modified polypropylene resin, while enhancing its mechanical properties. In addition, it cooperates with the functional groups of the side chain of the modified polypropylene resin during the combustion process to achieve the purpose of improving its flame retardant properties, and finally prepares a wear-resistant, low-density, high-temperature resistant and flame-retardant mesh PP filling rope.

[0141] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0142] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0143] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-density flame-retardant PP mesh cable filling rope, characterized in that: The invention comprises the following raw material components in parts by weight: 80-100 parts of modified polypropylene resin, 5-10 parts of foaming nucleating agent, 10-20 parts of plasticizer, 2-5 parts of stabilizer, 0.5-2 parts of lubricant, and 0.5-1 parts of antioxidant; The preparation method of the modified polypropylene resin is as follows: 3-5 parts of a char-forming foaming agent, 5-8 parts of 5-hexenyltrimethylsiloxane, 5-8 parts of 2-amino-4,6-divinyl-1,3,5-triazine, 0.3-0.5 parts of azobisisobutyronitrile and 30-40 parts of dimethyl sulfoxide are weighed by weight and added into a reaction kettle, the temperature of the reaction kettle is increased to 50-70°C, the reaction is kept warm for 2-4 hours, and the modified polypropylene resin is obtained by post-treatment.

2. A low-density flame-retardant PP mesh cable filling rope according to claim 1, characterized in that: The preparation method of the carbon-forming foaming agent is as follows: 8-10 parts of phosphated triazine derivatives, 1-2 parts of 4,6-hepten-2-one, 1-2 parts of 4,4,4-trifluorobutyraldehyde, 2-3 parts of γ-alumina and 30-40 parts of dimethyl sulfoxide are weighed by weight and added into a reaction kettle, the temperature of the reaction kettle is increased to 60-80°C, the reaction is kept warm for 2-3 hours, and the carbon-forming foaming agent is obtained by post-treatment.

3. A low-density flame-retardant PP mesh cable filling rope according to claim 2, characterized in that: The preparation method of the phosphated triazine derivative is as follows: 5-8 parts of a hybrid triazine derivative, 2-4 parts of 2-(hydroxyphosphoryl)hydrazine acid, 0.1-0.3 parts of chloroplatinic acid and 40-50 parts of NN-dimethylformamide are weighed by weight and added into a reaction kettle, the temperature of the reaction kettle is increased to 40-50° C., the reaction is kept warm for 1-2 hours, and the phosphated triazine derivative is obtained by post-treatment.

4. A low-density flame-retardant PP mesh cable filling rope according to claim 3, characterized in that: The preparation method of the hybrid triazine derivative is as follows: 8-10 parts of aminated triazine derivatives, 3-5 parts of 4,4,4-trifluorobutyraldehyde, 1-2 parts of aluminum chloride and 40-50 parts of toluene are weighed and added into a reaction kettle, the temperature of the reaction kettle is increased to 40-50° C., the reaction is kept warm for 1-2 hours, and the hybrid triazine derivative is obtained by post-treatment.

5. A low-density flame-retardant PP mesh cable filling rope according to claim 4, characterized in that: The preparation method of the aminated triazine derivative is as follows: 5-8 parts of triazine derivative, 2-4 parts of 6-methylcytosine, 1-2 parts of sodium hydroxide powder and 30-40 parts of toluene are weighed and added into a reaction kettle, the temperature of the reaction kettle is increased to 70-80° C., the reaction is kept warm for 1-3 hours, and the aminated triazine derivative is obtained by post-treatment.

6. A low-density flame-retardant PP mesh cable filling rope according to claim 5, characterized in that: The preparation method of the triazine derivative is as follows: 3-5 parts of cyanuric chloride, 5-8 parts of 9,10-diaminophenanthrene, 1-2 parts of sodium hydroxide powder and 30-40 parts of toluene are weighed by weight and added into a reaction kettle, the temperature of the reaction kettle is increased to 40-50° C., the reaction is kept warm for 2-4 hours, and the triazine derivative is obtained by post-treatment.

7. The low-density flame-retardant PP mesh cable filling rope according to claim 1, characterized in that: The preparation method of the foaming nucleating agent is as follows: 20-30 parts of a modified foaming agent, 5-10 parts of N,N'-diaminoformamide and 75-100 parts of NN-dimethylformamide are weighed by weight and added into a reaction kettle, stirred at room temperature for 5-10 minutes, the temperature of the reaction kettle is lowered to 0-5°C, 1-2 parts of 1-hydroxybenzotriazole, 1-2 parts of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 1-2 parts of N-methylmorpholine are added thereto, the reaction is kept warm for 1-2 hours, and post-processed to obtain the foaming nucleating agent.

8. The low-density flame-retardant PP mesh cable filling rope according to claim 7, characterized in that: The preparation method of the modified foaming agent comprises the following steps: A1. Weigh 5-8 parts of multilayer graphene and 50-60 parts of 98wt% sulfuric acid by weight and add them to a reactor at a temperature of 0-5°C. After stirring for 10-15 minutes, add 3-5 parts of sodium chlorate to the reactor. After the temperature of the reactor is maintained at 0-5°C and reacted for 2-4 hours, a saturated sodium hydroxide solution is used to adjust the pH of the reaction system to 7, and post-process to obtain oxidized multilayer graphene. A2, weigh 1-2 parts of aluminate coupling agent by weight and add them to a reactor, introduce nitrogen protection, raise the temperature of the reactor to 40-60°C, wait until the aluminate coupling agent is in a molten state, add 3-5 parts of potassium bicarbonate, 6-8 parts of ammonium sulfate and 2-3 parts of calcium carbonate to the reactor, keep warm and stir for 15-20 minutes, and post-treat to obtain a mixed powder; A3. 8-10 parts of oxidized multilayer graphene, 20-24 parts of ethanol and 3-5 parts of mixed powder are weighed by weight and added into a reactor. After ultrasonication for 10-15 minutes at room temperature, the temperature of the reactor is raised to 30-50° C. and ultrasonication is performed for 20-30 minutes at a constant ultrasonic frequency of 20-40 kHz. The modified foaming agent is obtained by post-treatment.

9. A method for preparing a low-density flame-retardant PP mesh cable filling rope according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. uniformly mixing modified polypropylene resin, foaming nucleating agent, plasticizer, stabilizer, lubricant and antioxidant to obtain a mixture; S2, adding the mixed material into a twin-screw extruder, and melt-extruded through the twin-screw extruder to obtain a polypropylene strip with a thickness of 2 mm; S3, placing the polypropylene film in a stretching machine, controlling the longitudinal stretching ratio to be 4-6:1, the transverse stretching ratio to be 8-12:1, and stretching to obtain a stretched film; S4. Place the stretched film in a CNC cutting machine to cut it into long strips of film, transfer the long strips of film to a mesh opening machine to open the mesh, and obtain a mesh filling rope precursor. Place the mesh filling rope precursor in a stretching machine, set the temperature of the stretching machine to 100-120°C, and keep it warm until the mesh filling rope does not shrink, and obtain a mesh filling rope.

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