CN111574826A - Polytetrafluoroethylene master batch for nylon modification and preparation method thereof - Google Patents

Polytetrafluoroethylene master batch for nylon modification and preparation method thereof Download PDF

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CN111574826A
CN111574826A CN202010342181.1A CN202010342181A CN111574826A CN 111574826 A CN111574826 A CN 111574826A CN 202010342181 A CN202010342181 A CN 202010342181A CN 111574826 A CN111574826 A CN 111574826A
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nylon
polytetrafluoroethylene
parts
master batch
antioxidant
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郑期强
范文春
张博文
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Zhejiang Juhua Research Institute Of New Materials Co ltd
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Zhejiang Juhua Research Institute Of New Materials Co ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/06—Polyamides derived from polyamines and polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/06—Polyamides derived from polyamines and polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
    • C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds

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  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

The invention discloses a polytetrafluoroethylene master batch for nylon modification, which is prepared from the following raw materials in parts by mass: 20-70 parts of nylon resin, 30-80 parts of polytetrafluoroethylene, 0.1-10 parts of impregnating compound, 0.1-10 parts of dispersing agent and 0.01-1 part of antioxidant. The preparation method comprises the steps of drying and weighing raw materials, physically blending the raw materials and carrying out melt extrusion granulation by a double screw. By preparing the polytetrafluoroethylene into the plastic master batch, the problems that the powdery polytetrafluoroethylene is adhered to a container during processing, metering is inaccurate, the health of operators is influenced, the environment is polluted and the like can be well solved. The master batch is added into the nylon resin, so that the wear resistance of the material can be improved, and the material has good dispersibility and is convenient to use in the processing and using processes.

Description

Polytetrafluoroethylene master batch for nylon modification and preparation method thereof
Technical Field
The invention belongs to the field of nylon modification, and particularly relates to polytetrafluoroethylene master batch for nylon modification and a preparation method thereof.
Background
Nylon is one of general engineering plastics, and is the variety which is developed earliest, has the largest yield and is most widely applied. The friction material has good mechanical property, excellent friction property and easy processing and forming, and is widely applied to the field of friction materials to replace traditional materials such as metal, ceramic and the like. However, as the working environment becomes more and more demanding, the friction performance of the material is also more and more required. Therefore, the nylon is required to be subjected to wear resistance modification so as to obtain more excellent frictional wear performance.
Polytetrafluoroethylene is an excellent solid lubricant, and the polytetrafluoroethylene can be used as an additive to be added into a polymer to greatly improve the friction lubricity, so that the wear resistance of the material is improved. However, the product is mainly prepared by mixing in a mixer and melt extrusion in an extruder, and the polytetrafluoroethylene powder is easy to adhere to a container in the preparation process, so that the problems of inaccurate metering, influence on the health of operators, environmental pollution and the like are caused.
The plastic master batch is a novel plastic forming processing aid developed in the 80 th of the 20 th century, and is prepared by adding a plastic aid with an addition amount exceeding the conventional amount (more than 50%) into a carrier resin, so that the master batch can be directly added when plastic products are formed. The plastic master batch can simplify the production process engineering, reduce dust flying and equipment abrasion, save raw materials, ensure convenient raw material mixing and uniform mixing quality, thereby improving the production efficiency and the performance index of products.
In the index of the powder auxiliary agent, the change of the oil absorption value is very important for the application of the product. The oil absorption value is related to the surface chemical property of the powder material besides determining the chemical composition and purity of the powder material. The oil absorption value is also called resin adsorption capacity and represents an index of the resin adsorption capacity of the powder material. In practical applications, most of the indexes related to the oil absorption value of the filler are used for roughly predicting the demand of the filler for the resin. The different oil absorption values can change the compatibility with high polymer, and the oil absorption value directly affects the quality, performance and use of the material. The oil absorption value is usually expressed in terms of the mass of linseed oil required for a 100g sample, i.e. in terms of the minimum amount of oil required per 100g sample to achieve complete wetting. The measurement of oil absorption number is roughly divided into two types: one is to use a knife to knead the mixture into paste which does not disperse rigid putty as a terminal point; alternatively, the pigment is placed in a glass cup and linseed oil is added at a rate of one second drop and kneaded with a spatula or glass rod until the soft paste is flowable. The oil absorption measurement result is related to the force and the operation time, and is also related to the judgment method of the terminal by the operator, so that the oil absorption value obtained by people is a range rather than a fixed value. The oil absorption value is related to the size, shape, distribution, specific surface area and particle surface property of the powder. The finer the particle size of the powder particles, the larger the specific surface area, the narrower the distribution, and the higher the oil absorption. Oil absorption value of particle shape: needle-like > flake-like > spherical. The larger the oil absorption value is, the more than several times or even dozens of times of resin with the powder body can be consumed, so that the production cost can be increased; meanwhile, the resin cannot completely cover the powder surface and fill the gaps among the particles, and more resin is needed to complete the process, so that the preparation of the master batch with high concentration cannot be realized.
Polytetrafluoroethylene, because all hydrogen atoms attached to the backbone carbon atoms are replaced by fluorine atoms, has many unique properties such as the best chemical inertness, excellent thermal stability, low coefficient of friction, excellent dielectric properties and radiation resistance. At the same time, however, polytetrafluoroethylene has the lowest surface energy of all polymers, has self-lubrication and non-tackiness, and does not wet the surface of the article. And because of high crystallinity and extremely high viscosity at the melting point, the thermoplastic resin composition does not flow even reaching the melting temperature, only undergoes volume expansion and is fused into a whole, and a melt is easy to break under the action of shearing force, so that the thermoplastic resin composition is not suitable for a thermoplastic processing method widely adopted by general plastics. Polytetrafluoroethylene is used as a filler in related industries, has high requirements on particle size and distribution thereof, and cannot reduce the specific surface area by changing the particle size so as to reduce the oil absorption value. In addition, polytetrafluoroethylene has low surface energy and poor surface properties, and is not easy to wet and coat, so that the oil absorption value of polytetrafluoroethylene is very high (more than 100). Further, since it is not suitable for a thermoplastic processing method widely used for general-purpose plastics, polytetrafluoroethylene powder is not considered to be produced as a master batch.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the polytetrafluoroethylene master batch for nylon modification.
In order to solve the technical problems, the invention adopts the following technical scheme:
a polytetrafluoroethylene master batch for nylon modification is characterized in that: the feed is prepared from the following raw materials in parts by mass: 20-70 parts of nylon resin, 30-80 parts of polytetrafluoroethylene, 0.1-10 parts of impregnating compound, 0.1-10 parts of dispersing agent and 0.01-1 part of antioxidant.
Preferably, the nylon resin is one or more of nylon 66, nylon 6, nylon 46, nylon 12 and nylon 1010, preferably nylon 6 or nylon 66.
Preferably, the nylon resin is in the form of particles or powder, and the relative viscosity is less than or equal to 2.7. Preferably the relative viscosity is between 1.5 and 2.4.
Preferably, the polytetrafluoroethylene is one or a mixture of polytetrafluoroethylene micro powder and polytetrafluoroethylene fine powder, and the average particle size is 2-35 μm. Preferably polytetrafluoroethylene micropowder, having an average particle size of between 5 and 20 μm.
Preferably, the impregnating compound is one or a mixture of more of white oil, silicone oil, paraffin oil and solvent oil. Preferably silicone oil, the mass portion of which is between 1 and 8.
Preferably, the dispersing agent is one or a mixture of more of ethylene bis stearamide, modified ethylene bis stearamide, silicone powder, polyamide wax, zinc stearate and calcium stearate. Wherein, the phenolic antioxidant can be 1098, 1010, 1076, 9228, BHT, 1024, etc., the phosphorus antioxidant can be 168, 626, 686, 636, 450, etc., and the thioether antioxidant can be DLTP, DSTP, etc. Preferably, the antioxidant is a mixture of an antioxidant 1098 and an antioxidant 168, and the mass portion of the antioxidant is between 0.01 and 1 portion.
Preferably, the antioxidant is any one or a mixture of several of phenolic antioxidant, phosphorus antioxidant, thioether antioxidant and metal salt antioxidant.
A preparation method of polytetrafluoroethylene master batch for nylon modification is characterized by comprising the following steps:
(1) drying and weighing the raw materials: weighing 20-70 parts of nylon resin according to the mass part, drying the nylon resin at 60-120 ℃ for 1-5 hours, and then naturally cooling; weighing 30-80 parts of polytetrafluoroethylene, 0.1-10 parts of dispersant and antioxidant in parts by mass: 0.01-1 part;
(2) physical blending: physically blending the dried nylon resin, polytetrafluoroethylene, impregnating compound, dispersing agent and antioxidant in a high-speed mixer, mixing the mixture for 1-3 minutes at the rotating speed of 5-15HZ, then mixing for 1-3 minutes at the rotating speed of 15-30HZ, then mixing for 1-2 minutes at the rotating speed of 30-50HZ, and finally discharging at the rotating speed of 15-30 HZ;
(3) and (3) double-screw melt extrusion granulation: adding the mixed materials into a hopper of a double-screw extruder, wherein the temperature of the extruder is 200-300 ℃, the rotating speed of the screw is 50-150 r/min, and extruding and granulating.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
by preparing the polytetrafluoroethylene into the plastic master batch, the problems that the powdery polytetrafluoroethylene is adhered to a container during processing, metering is inaccurate, the health of operators is influenced, the environment is polluted and the like can be well solved. In addition, the carrier of the special master batch is the same as the plastic of the product, so the special master batch has good matching property, and the particles can be well dispersed in the plastic of the product after being heated and melted. The master batch is added into the nylon resin, so that the wear resistance of the material can be improved, and the material has good dispersibility and is convenient to use in the processing and using processes. When in use, the dosage can be accurately measured according to the formula requirement, and the method has no dust pollution and is environment-friendly. The silicone oil can have certain wetting and coating effects on the surface of polytetrafluoroethylene powder, and can be matched with other auxiliary agents to prepare master batches with PTFE content of 50% or more.
Drawings
The invention is further illustrated below with reference to the accompanying drawings.
FIG. 1 is a thermogravimetric analysis curve of the master batch in example 2.
Detailed Description
Example 1
The polytetrafluoroethylene master batch for nylon modification provided by the embodiment is prepared from the following raw materials in parts by mass: nylon 6: 50 parts of polytetrafluoroethylene, 50 parts of white oil, 5 parts of EBS3 parts, antioxidant 1098: 0.1 part, antioxidant 168: 0.3 part.
Step 1: weighing nylon 6 in parts by mass: 50 parts of the mixture are dried at 100 ℃ for 3 hours and then naturally cooled. Weighing 50 parts of polytetrafluoroethylene, 5 parts of white oil and TAF: 3 parts, antioxidant 1098: 0.1 part, antioxidant 168: 0.3 part.
Step 2: the raw materials were added in different proportions to a high speed mixer. The mixer is first mixed for 3 minutes at 5Hz, then for 3 minutes at 15Hz, then for 1 minute at 30Hz, and finally discharged at 15 Hz.
And step 3: adding the mixed materials into a hopper of a double-screw extruder, wherein the temperature of the extruder is 230-245 ℃, the rotating speed of the screw is 100 r/min, and extruding and granulating.
Example 2
The polytetrafluoroethylene master batch for nylon modification provided by the embodiment is prepared from the following raw materials in parts by mass: nylon 6: 40 parts, 60 parts of polytetrafluoroethylene, 6 parts of silicone oil, and TAF: 2 parts, antioxidant 1098: 0.15 part, antioxidant 168: 0.35 part.
Step 1: weighing nylon 6 in parts by mass: 40 parts of the mixture are dried at 100 ℃ for 3 hours and then naturally cooled. Weighing 60 parts of polytetrafluoroethylene, 5 parts of silicone oil and TAF: 2 parts, antioxidant 1098: 0.15 part, antioxidant 168: 0.35 part.
Step 2: the raw materials were added in different proportions to a high speed mixer. The mixer was first mixed for 2 minutes at 10HZ, then for 2 minutes at 20HZ, then for 1.5 minutes at 35HZ and finally discharged at 20 HZ.
And step 3: adding the mixed materials into a hopper of a double-screw extruder, wherein the temperature of the extruder is 230-245 ℃, the rotating speed of the screw is 115 revolutions per minute, and extruding and granulating.
Example 3
The polytetrafluoroethylene master batch for nylon modification provided by the embodiment is prepared from the following raw materials in parts by mass: nylon 66: 30 parts, 70 parts of polytetrafluoroethylene, 7 parts of silicone oil, and TAF: 2.5 parts, antioxidant 1098: 0.15 part, antioxidant 168: 0.35 part.
Step 1: weighing nylon 66 in parts by weight: 30 parts of the mixture were dried at 105 ℃ for 3 hours and then naturally cooled. Weighing 70 parts of polytetrafluoroethylene, 7 parts of silicone oil and TAF: 2.5 parts, antioxidant 1098: 0.15 part, antioxidant 168: 0.35 part.
Step 2: the raw materials were added in different proportions to a high speed mixer. The mixer is first mixed for 2 minutes at 15Hz, then for 2 minutes at 25Hz, then for 1 minute at 35Hz, and finally discharged at 20 Hz.
And step 3: adding the mixed materials into a hopper of a double-screw extruder, wherein the temperature of the extruder is 240 ℃ and 260 ℃, the rotating speed of the screw is 110 r/min, and extruding and granulating.
Example 4
The polytetrafluoroethylene master batch for nylon modification provided by the embodiment is prepared from the following raw materials in parts by mass: nylon 66: 40 parts, 60 parts of polytetrafluoroethylene, 3 parts of white oil, and TAF: 4 parts, antioxidant 1098: 0.15 part, antioxidant 168: 0.4 part.
Step 1: weighing nylon 66 in parts by weight: 40 parts of the mixture were dried at 105 ℃ for 3 hours and then naturally cooled. Weighing 60 parts of polytetrafluoroethylene, 3 parts of white oil and TAF: 4 parts, antioxidant 1098: 0.15 part, antioxidant 168: 0.4 part.
Step 2: the raw materials were added in different proportions to a high speed mixer. The mixer is first mixed for 2 minutes at 10Hz, then for 2 minutes at 25Hz, then for 1 minute at 40Hz, and finally discharged at 20 Hz.
And step 3: and adding the mixed materials into a hopper of a double-screw extruder, wherein the temperature of the extruder is 250-270 ℃, the rotating speed of the screw is 120 r/min, and extruding and granulating.
The master batches obtained in examples 1 to 4 were blended with PA66 resin (Marima EPR27, relative viscosity 2.7) to prepare a nylon 66 material having a polytetrafluoroethylene content of 15%. The injection molding is directly carried out to obtain a standard test sample bar, and the injection molding temperature is 240-285 ℃. Examples 1 to 4 correspond to the application examples N1 to N4.
Mixing polytetrafluoroethylene with PA66 resin, silicone oil, TAF and antioxidant, extruding and granulating by a double-screw extruder (screw diameter 42, length-diameter ratio 40) at the temperature of 200-270 ℃. Wherein, 1 part of silicone oil, TAF: 1 part of antioxidant 1098 and 0.1 part of antioxidant 168. Finally, a standard test specimen was obtained by injection molding at a temperature of 240 ℃ and 285 ℃ to give comparative example M1.
Table 1: results of performance testing of comparative example 1 and examples 1-4.
Figure BDA0002468900860000061
Figure BDA0002468900860000071
The test method comprises the following steps: tensile strength: GB/T1040
Bending strength: GB/T9341
Impact strength: GB/T1043
Coefficient of friction, wear loss: GB/T3960
Actual content of polytetrafluoroethylene: thermogravimetric analysis
The thermogravimetric analysis curve shown in fig. 1 shows that the polytetrafluoroethylene content of the master batch in example 2 is about 55%, which is similar to the calculated value of 60/(40+60+6+2+0.15+0.35) ≈ 55.3%, thus indicating that the polytetrafluoroethylene master batch is successfully prepared.
Since the mechanical properties of the carrier resin nylon 6 were slightly lower than those of the nylon 66 resin, the bars prepared in examples 1-4 were slightly lower in tensile strength and flexural strength than comparative example 1, but the notched impact strength was slightly improved. In addition, comparative example 1 caused the actual amount of PTFE in the final sample to deviate from the desired set value due to the tendency of PTFE powder to stick to the walls of the container and cartridge during the preparation process or to be sucked away by the vacuum device. The polytetrafluoroethylene in examples 1-4 was added to nylon 66 resin in the form of master batch, and the effective content reached the expected setting (actual content of polytetrafluoroethylene is about 15%), and the metering was accurate. Therefore, the friction coefficient and the abrasion loss of the material are reduced compared with those of a comparative example, and the abrasion resistance of the material is improved.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present invention to solve the same technical problems and achieve the same technical effects are all covered in the protection scope of the present invention.

Claims (8)

1. A polytetrafluoroethylene master batch for nylon modification is characterized in that: the feed is prepared from the following raw materials in parts by mass: 20-70 parts of nylon resin, 30-80 parts of polytetrafluoroethylene, 0.1-10 parts of impregnating compound, 0.1-10 parts of dispersing agent and 0.01-1 part of antioxidant.
2. The polytetrafluoroethylene master batch for nylon modification according to claim 1, wherein: the nylon resin is one or a mixture of nylon 66, nylon 6, nylon 46, nylon 12 and nylon 1010.
3. The polytetrafluoroethylene master batch for nylon modification according to claim 1, wherein: the nylon resin is in the form of particles or powder, and the relative viscosity is less than or equal to 2.7.
4. The polytetrafluoroethylene master batch for nylon modification according to claim 1, wherein: the polytetrafluoroethylene is one or a mixture of polytetrafluoroethylene micro powder and polytetrafluoroethylene fine powder, and the average particle size is 2-35 mu m.
5. The polytetrafluoroethylene master batch for nylon modification according to claim 1, wherein: the impregnating compound is one or a mixture of more of white oil, silicone oil, paraffin oil and solvent oil.
6. The polytetrafluoroethylene master batch for nylon modification according to claim 1, wherein: the dispersing agent is one or a mixture of more of ethylene bis stearamide, modified ethylene bis stearamide, silicone powder, polyamide wax, zinc stearate and calcium stearate.
7. The polytetrafluoroethylene master batch for nylon modification according to claim 1, wherein: the antioxidant is any one or a mixture of several of phenolic antioxidant, phosphorus antioxidant, thioether antioxidant and metal salt antioxidant.
8. The preparation method of the polytetrafluoroethylene master batch for nylon modification according to claim 1, characterized by comprising the following steps:
(1) drying and weighing the raw materials: weighing 20-70 parts of nylon resin according to the mass part, drying the nylon resin at 60-120 ℃ for 1-5 hours, and then naturally cooling; weighing 30-80 parts of polytetrafluoroethylene, 0.1-10 parts of dispersant and antioxidant in parts by mass: 0.01-1 part;
(2) physical blending: physically blending the dried nylon resin, polytetrafluoroethylene, impregnating compound, dispersing agent and antioxidant in a high-speed mixer, mixing the mixture for 1-3 minutes at the rotating speed of 5-15HZ, then mixing for 1-3 minutes at the rotating speed of 15-30HZ, then mixing for 1-2 minutes at the rotating speed of 30-50HZ, and finally discharging at the rotating speed of 15-30 HZ;
(3) and (3) double-screw melt extrusion granulation: adding the mixed materials into a hopper of a double-screw extruder, wherein the temperature of the extruder is 200-300 ℃, the rotating speed of the screw is 50-150 r/min, and extruding and granulating.
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CN112375330A (en) * 2020-11-11 2021-02-19 天津金发新材料有限公司 High-gloss hydrophobic ABS composition and preparation method and application thereof
CN114316578A (en) * 2021-12-27 2022-04-12 湖北科普达高分子材料股份有限公司 Nylon cable material and preparation method thereof
WO2022195425A1 (en) * 2021-03-14 2022-09-22 Klj Polymers And Chemicals Limited A polyamide or fluoropolymer composite material and method of its preparation
CN115160777A (en) * 2022-08-19 2022-10-11 古道尔工程塑胶（深圳）有限公司 Super-wear-resistant hydrophobic nylon composite material with stable size and preparation method thereof

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Application publication date: 20200825