CN110272593A - A kind of preparation method of high-intensitive cold-resistant PP-R composite material - Google Patents
A kind of preparation method of high-intensitive cold-resistant PP-R composite material Download PDFInfo
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Abstract
The present invention relates to a kind of preparation methods of high-intensitive cold-resistant PP-R composite material, belong to plastics arts.The present invention passes through addition SiC Nanometer Whiskers, the high-intensitive cold-resistant PP-R composite material of preparation, the cold resistance of atactic copolymerized polypropene can be improved as modifying agent for SiC Nanometer Whiskers, modified atactic copolymerized polypropene not only has preferable toughness, also has good heat resistance and dimensional stability.The contact area of SiC Nanometer Whiskers and atactic copolymerized polypropene is larger, when resin matrix is by external impacts, it can produce more micro-crack around it and absorb energy, simultaneously, it is preferable with the compatibility of atactic copolymerized polypropene for nano whisker, nano whisker can prevent the growth of crackle, whisker is under the action of machining stress, it can be rapidly in the regular matrix for coming plasticizing, and the growth of crackle can be prevented, energy is quickly dispersed, to effectively improve the cold tolerance of substrate.
Description
Technical field
The present invention relates to a kind of preparation methods of high-intensitive cold-resistant PP-R composite material, belong to plastics technology
Field.
Background technique
Various polypropylene (PP) polymer were widely deployed and applied in recent years, using PP as matrix, successively developed
The PPH of homopolymerization (I type), the PPB (II type) of block copolymerization and three kinds of new materials of PPR (III type) of random copolymerization.Wherein without
Advising copolymer polypropylene (PPR) is that vinyl monomer random copolymerization enters the new polymers developed in PP main chain.PPR is excellent due to its
Comprehensive performance is more and more valued by people, and application field constantly expands.It is mainly used for tubing, packaging bag, automobile member
The industrial circles such as part, furniture.PPR material has good heat resistance and compressive resistance, and high temperature creep property is good.With it is other
Plastics are compared, the feature of environmental protection, recoverable, processing technology in terms of all have very big advantage.But
Since PPR notch impact strength is not high, especially its brittleness is especially prominent under low temperature (being lower than 0 DEG C) or high strain rate, punching
Every technical requirements that industrial circle is also much not achieved in performance etc. are hit, are limited its scope of application to a certain extent.
Therefore, the low-temperature impact property for effectively improving PPR material just becomes crucial technical problem urgently to be resolved.
PPR polymer material and product are chiefly used in the industrial circles such as tubing, automotive components, furniture.In recent years, China was built
Industry is even more to generally use PPR pipe as indoor and outdoor hot and cold water dedicated pipe.This requires its not only to have it is good heat-resisting
Property and compressive resistance, will also have preferable low-temperature resistance and ultralow temperature impact flexibility.Especially in most of the northern region of China,
Temperature on average is lower due to geographical location, and the temperature in winter even can achieve -20 DEG C~-30 DEG C, common PPR pipe
Be no longer satisfied the use demand in the region.Therefore, improve PPR material low-temperature impact property just become expansion its using area
The critical issue of domain and service life.
There are mainly two types of the modes for obtaining highly resistance low temperature impact strength PPR material: first, passing through modification technology and compatibility
Technology improves resin/reinforced phase interface compatibility and aggregated structure to improve the low-temperature impact property of material；Second, adopting
With annealing technology, the mobility and crystallizing power of PPR material molecule chain are improved, reduces spherulite size, induction α crystal orientation β is brilliant to be turned
Become to improve the comprehensive mechanical property of material.Domestic and international researcher has done a large amount of work, is mainly mentioned by the way that filler is added
The mechanical property of high PPR material, or by the way that beta nucleater is added to achieve the purpose that activeness and quietness.However above method is deposited
It is unevenly distributed in apparent second phase, particle agglomeration and the problems such as with matrix poor compatibility.This inevitably result in material by
Power defect, to accelerate the generation and diffusion of crackle under low temperature.
Therefore, for the low-temperature resistance plastic material for needing to develop a kind of excellent combination property, to make up the vacancy in market.
Summary of the invention
The technical problems to be solved by the invention: the polypropylene random copolymer material prepared for existing method is because of stress
Defect, thus accelerate crackle under low temperature lead to the problem of and diffusion, provide a kind of high-intensitive cold-resistant atactic copolymerized polypropene
The preparation method of composite material.
In order to solve the above technical problems, the present invention is using technical solution as described below:
(1) by polypropylene random copolymer material, modified carbon fiber, SiC Nanometer Whiskers, odium stearate, glycerine, anti-
Oxygen agent 1010 is placed in high-speed mixer, is stirred 20~30min under room temperature with 800~1000r/min revolving speed, obtains mixture；
(2) mixing material is placed in 15~20min of mixing, extruding pelletization in double screw extruder and obtains mixing pellet；
(4) mixing pellet is placed in pressure maintaining in injection molding machine and is molded 6~10s, room temperature cooling obtains high-intensitive cold-resistant random copolymerization
PP composite material.
It is the polypropylene random copolymer material, modified carbon fiber, SiC Nanometer Whiskers, odium stearate, glycerine, anti-
The parts by weight of oxygen agent 1010 are 80~100 parts of polypropylene random copolymer materials, 16~20 parts of modified carbon fibers, 20~25 parts of carbonizations
Silicon nanocrystal palpus, 8~10 parts of odium stearate, 4~5 parts of glycerine, 0.4~0.5 part of antioxidant 1010.
Each area's temperature of double screw extruder described in step (2) be respectively 220 DEG C of area's temperature, 230 DEG C of two area's temperature,
Three 220 DEG C of area's temperature, 210 DEG C of four area's temperature, 190 DEG C of die head temperature.
The condition of the injection molding of pressure maintaining described in step (3) is 190 DEG C~230 DEG C of temperature, 50~60MPa of pressure.
The specific preparation step of SiC Nanometer Whiskers described in step (1) are as follows:
(1) nano silica, carbon black are placed in blender, under room temperature with 200~250r/min revolving speed stirring 20~
30min obtains mixed-powder:
(2) mixed-powder is placed in graphite crucible, and spreads carbon fiber, be placed in tube-type atmosphere furnace, be passed through argon gas guarantor
Shield, is warming up to 1600~1700 DEG C, and heat preservation 8~10h of calcining cools to room temperature with the furnace, obtains SiC Nanometer Whiskers.
The nano silica, carbon black, carbon fiber parts by weight be 20~30 parts of nano silicas, 10~15 parts
Carbon black, 8~12 parts of carbon fibers.
The rate that is passed through of argon gas described in step (2) is 120~160mL/min, and heating rate is 20 DEG C/min.Step
(1) the specific preparation step of the modified carbon fiber described in is
(1) acid potassium bichromate is added in nitric acid, 12~16min is stirred with 160~180r/min revolving speed under room temperature, is obtained
Acid modification liquid；
(2) carbon fiber is added in acid modification liquid, with 300~400r/min revolving speed under 70~80 DEG C of water bath condition
1~2h is stirred, carbon fiber suspension is obtained；
(3) carbon fiber suspension is placed in ultrasonic dispersing machine, under conditions of 60~70 DEG C be ultrasonically treated 40~
60min, filtering, takes filter cake, is washed with deionized to neutrality, is placed in 50~60 DEG C of baking oven dry 1~2h, and shearing obtains
Modified carbon fiber；
The carbon fiber, acid potassium bichromate, nitric acid parts by weight be 20~30 parts of carbon fibers, 4~6 parts of acid weight chromium
The nitric acid of sour potassium, 60~90 parts of mass fractions 30%.
The power of ultrasonic treatment described in step (3) is 400~500W, and the average length of modified carbon fiber is 6~8mm.
The present invention is compared with other methods, and advantageous effects are:
(1) present invention is using carbon fiber as supporting material, and is modified by nitric acid and acid potassium bichromate, and preparation is high-intensitive resistance to
Cold PP-R composite material, carbon fiber are that the fibrous polymer with decomposition temperature lower than fusion point temperature passes through thousand
Spend or more solid phase pyrolysis and it is manufactured, be discharged other elements in thermal cracking processes, form graphite lattice structure, with nitric acid and acid
Property potassium dichromate oxidation carbon fiber, its surface can be made to generate carboxyl, hydroxyl and acidic-group, contained by the carbon fiber surface after oxidation
Various oxygen-containing polar groups and gully increased significantly, increase surface roughness be conducive to carbon fiber and matrix resin machinery it is embedding
It closing, enhances anchor ingot effect, graphite microcrystal is smaller, and the number of active atoms of carbon is more, be more conducive to the bonding of fiber and resin,
The functional group of carbon fiber surface can react with matrix, formation chemical bond, after surface treated, carbon fiber surface graphite microcrystal
Attenuate, unsaturated carbon atom number increases, and polar group increases, this is conducive to improve the combination between fiber and basis material
Power improves composite material interlayer shear strength and mechanical strength；
(2) present invention prepares high-intensitive cold-resistant PP-R composite material by addition SiC Nanometer Whiskers,
The cold resistance of atactic copolymerized polypropene, modified atactic copolymerized polypropene can be improved as modifying agent for SiC Nanometer Whiskers
Not only there is preferable toughness, also there is good heat resistance and dimensional stability.Because SiC Nanometer Whiskers are total to random
It is larger to gather polyacrylic contact area, when resin matrix is by external impacts, can produce more micro-crack around it
Absorb energy, meanwhile, the shape of nano whisker be it is needle-shaped, major diameter is bigger, crystallized in the form of monocrystalline, almost without defect,
It is preferable with the compatibility of atactic copolymerized polypropene, and nano whisker can prevent the growth of crackle, and preventing it from developing into makes matrix
The crackle of fracture, whisker, can be rapidly in the regular matrix for coming plasticizing under the action of machining stress, and can prevent
The growth of crack arrest line enables energy quickly to be dispersed, to effectively improve the cold tolerance of substrate.
Specific embodiment
According to parts by weight, 20~30 parts of carbon fibers, 4~6 parts of acid potassium bichromates, 60~90 parts of quality point are weighed respectively
Acid potassium bichromate is added in nitric acid the nitric acid of number 30%, stirs 12~16min under room temperature with 160~180r/min revolving speed,
Acid modification liquid is obtained, carbon fiber is added in acid modification liquid, is turned under 70~80 DEG C of water bath condition with 300~400r/min
Speed 1~2h of stirring, obtains carbon fiber suspension, carbon fiber suspension is placed in ultrasonic dispersing machine, in 60~70 DEG C of condition
Under 40~60min is ultrasonically treated with the power of 400~500W, filtering takes filter cake, is washed with deionized to neutrality, is placed in 50
Dry 1~2h, shearing obtain the modified carbon fiber of 6~8mm of average length in~60 DEG C of baking oven；Again according to parts by weight, respectively
20~30 parts of nano silicas, 10~15 parts of carbon blacks, 8~12 parts of carbon fibers are weighed, nano silica, carbon black are placed in and stirred
It mixes in machine, 20~30min is stirred with 200~250r/min revolving speed under room temperature, mixed-powder is obtained, mixed-powder is placed in graphite earthenware
In crucible, and spread carbon fiber, be placed in tube-type atmosphere furnace, with the flow velocity of 120~160mL/min be passed through argon gas protection, with 20 DEG C/
The rate of min is warming up to 1600~1700 DEG C, and heat preservation 8~10h of calcining cools to room temperature with the furnace, obtains SiC Nanometer Whiskers；Again
According to parts by weight, 80~100 parts of polypropylene random copolymer materials, 16~20 parts of modified carbon fibers, 20~25 parts are weighed respectively
SiC Nanometer Whiskers, 8~10 parts of odium stearate, 4~5 parts of glycerine, 0.4~0.5 part of antioxidant 1010, random copolymerization is gathered
Propylene material, modified carbon fiber, SiC Nanometer Whiskers, odium stearate, glycerine, antioxidant 1010 are placed in high-speed mixer,
20~30min is stirred with 800~1000r/min revolving speed under room temperature, obtains mixture, mixing material is placed in double screw extruder
In, in 220 DEG C of area's temperature, 230 DEG C of two area's temperature, 220 DEG C of three area's temperature, 210 DEG C of four area's temperature, 190 DEG C of die head temperature
Under the conditions of mix 15~20min, extruding pelletization obtains mixing pellet, mixing pellet is placed in injection molding machine, 190 DEG C of temperature~
230 DEG C, pressure maintaining is molded 6~10s under conditions of 50~60MPa of pressure, room temperature cooling obtains high-intensitive cold-resistant atactic copolymerized polypropene
Composite material.
Embodiment 1
According to parts by weight, the nitre of 20 parts of carbon fibers, 4 parts of acid potassium bichromates, 60 parts of mass fractions 30% is weighed respectively
Acid potassium bichromate is added in nitric acid acid, stirs 12min under room temperature with 160r/min revolving speed, acid modification liquid is obtained, by carbon fiber
Dimension is added in acid modification liquid, stirs 1h under 70 DEG C of water bath condition with 300r/min revolving speed, carbon fiber suspension is obtained, by carbon
Fibrous suspension is placed in ultrasonic dispersing machine, is ultrasonically treated 40min under conditions of 60 DEG C with the power of 400W, and filtering takes
Filter cake is washed with deionized to neutrality, is placed in 50 DEG C of baking oven dry 1h, and shearing obtains the modification carbon fiber of average length 6mm
Dimension；Again according to parts by weight, respectively weigh 20 parts of nano silicas, 10 parts of carbon blacks, 8 parts of carbon fibers, by nano silica,
Carbon black is placed in blender, is stirred 20min under room temperature with 200r/min revolving speed, is obtained mixed-powder, mixed-powder is placed in graphite
In crucible, and carbon fiber is spread, be placed in tube-type atmosphere furnace, argon gas protection is passed through with the flow velocity of 120mL/min, with 20 DEG C/min
Rate be warming up to 1600 DEG C, heat preservation calcining 8h cools to room temperature with the furnace, obtains SiC Nanometer Whiskers；Again according to parts by weight,
Respectively weigh 80 parts of polypropylene random copolymer materials, 16 parts of modified carbon fibers, 20 parts of SiC Nanometer Whiskers, 8 parts of odium stearate,
4 parts of glycerine, 0.4 part of antioxidant 1010, by polypropylene random copolymer material, modified carbon fiber, SiC Nanometer Whiskers, tristearin
Sour sodium, glycerine, antioxidant 1010 are placed in high-speed mixer, are stirred 20min under room temperature with 800r/min revolving speed, must mix
Material, mixing material is placed in double screw extruder, in 220 DEG C of area's temperature, 230 DEG C of two area's temperature, 220 DEG C of three area's temperature, four
210 DEG C of area's temperature mixes 15min under conditions of 190 DEG C of die head temperature, and extruding pelletization obtains mixing pellet, and mixing pellet is placed in
In injection molding machine, pressure maintaining is molded 6s under conditions of 190 DEG C of temperature, pressure 50MPa, and room temperature cooling obtains high-intensitive cold-resistant random total
Poly- PP composite material.
Embodiment 2
According to parts by weight, the nitre of 25 parts of carbon fibers, 5 parts of acid potassium bichromates, 75 parts of mass fractions 30% is weighed respectively
Acid potassium bichromate is added in nitric acid acid, stirs 14min under room temperature with 170r/min revolving speed, acid modification liquid is obtained, by carbon fiber
Dimension is added in acid modification liquid, stirs 1.5h under 75 DEG C of water bath condition with 350r/min revolving speed, obtains carbon fiber suspension, will
Carbon fiber suspension is placed in ultrasonic dispersing machine, is ultrasonically treated 50min under conditions of 65 DEG C with the power of 450W, is filtered,
Filter cake is taken, is washed with deionized to neutrality, dry 1.5h is placed in 55 DEG C of baking oven, shearing obtains the modification of average length 7mm
Carbon fiber；Again according to parts by weight, 25 parts of nano silicas, 13 parts of carbon blacks, 10 parts of carbon fibers are weighed respectively, by nano-silica
SiClx, carbon black are placed in blender, are stirred 25min under room temperature with 225r/min revolving speed, are obtained mixed-powder, mixed-powder is placed in
In graphite crucible, and carbon fiber is spread, be placed in tube-type atmosphere furnace, argon gas protection is passed through with the flow velocity of 140mL/min, with 20
DEG C/rate of min is warming up to 1650 DEG C, heat preservation calcining 9h cools to room temperature with the furnace, obtains SiC Nanometer Whiskers；Again by weight
Number meter, weigh respectively 90 parts of polypropylene random copolymer materials, 18 parts of modified carbon fibers, 23 parts of SiC Nanometer Whiskers, 9 parts it is hard
Resin acid sodium, 4.5 parts of glycerine, 0.45 part of antioxidant 1010, polypropylene random copolymer material, modified carbon fiber, silicon carbide are received
Meter Jing Xu, odium stearate, glycerine, antioxidant 1010 are placed in high-speed mixer, are stirred under room temperature with 900r/min revolving speed
25min obtains mixture, and mixing material is placed in double screw extruder, in 220 DEG C of area's temperature, 230 DEG C of two area's temperature, 3rd area
220 DEG C of temperature, 210 DEG C of four area's temperature mix 17min under conditions of 190 DEG C of die head temperature, and extruding pelletization obtains mixing pellet, will
Mixing pellet is placed in injection molding machine, and pressure maintaining is molded 8s under conditions of 210 DEG C of temperature, pressure 55MPa, and room temperature cooling obtains high-strength
Spend cold-resistant PP-R composite material.
Embodiment 3
According to parts by weight, the nitre of 30 parts of carbon fibers, 6 parts of acid potassium bichromates, 90 parts of mass fractions 30% is weighed respectively
Acid potassium bichromate is added in nitric acid acid, stirs 16min under room temperature with 180r/min revolving speed, acid modification liquid is obtained, by carbon fiber
Dimension is added in acid modification liquid, stirs 2h under 80 DEG C of water bath condition with 400r/min revolving speed, carbon fiber suspension is obtained, by carbon
Fibrous suspension is placed in ultrasonic dispersing machine, is ultrasonically treated 60min under conditions of 70 DEG C with the power of 500W, and filtering takes
Filter cake is washed with deionized to neutrality, is placed in 60 DEG C of baking oven dry 2h, and shearing obtains the modification carbon fiber of average length 8mm
Dimension；Again according to parts by weight, 30 parts of nano silicas, 15 parts of carbon blacks, 12 parts of carbon fibers are weighed respectively, by nanometer titanium dioxide
Silicon, carbon black are placed in blender, are stirred 30min under room temperature with 250r/min revolving speed, are obtained mixed-powder, mixed-powder is placed in stone
In black crucible, and spread carbon fiber, be placed in tube-type atmosphere furnace, with the flow velocity of 160mL/min be passed through argon gas protection, with 20 DEG C/
The rate of min is warming up to 1700 DEG C, and heat preservation calcining 10h cools to room temperature with the furnace, obtains SiC Nanometer Whiskers；Again by weight
Number meter, weigh respectively 100 parts of polypropylene random copolymer materials, 20 parts of modified carbon fibers, 25 parts of SiC Nanometer Whiskers, 10 parts it is hard
Resin acid sodium, 5 parts of glycerine, 0.5 part of antioxidant 1010, polypropylene random copolymer material, modified carbon fiber, nanometer silicon carbide is brilliant
Palpus, odium stearate, glycerine, antioxidant 1010 are placed in high-speed mixer, are stirred under room temperature with 1000r/min revolving speed
30min obtains mixture, and mixing material is placed in double screw extruder, in 220 DEG C of area's temperature, 230 DEG C of two area's temperature, 3rd area
220 DEG C of temperature, 210 DEG C of four area's temperature mix 20min under conditions of 190 DEG C of die head temperature, and extruding pelletization obtains mixing pellet, will
Mixing pellet is placed in injection molding machine, and pressure maintaining is molded 10s under conditions of 230 DEG C of temperature, pressure 60MPa, and room temperature cooling obtains high-strength
Spend cold-resistant PP-R composite material.
High-intensitive cold-resistant PP-R composite material prepared by the present invention and pure PPR material are subjected to performance inspection
It surveys, specific testing result such as following table table 1.
Performance test
Impact property test
Impact property is tested by GB/T1843-2008, in room temperature (23 DEG C), low temperature (0 DEG C, -10 DEG C, -20 DEG C, -30
DEG C) 4h is kept the temperature in environment, shock-testing is quickly carried out after taking-up in identical temperature environment, impact strength is averaged.
Breakage rate test
Drop impact test is carried out by GB/T14153-93, tup diameter is Dn25mm.In room temperature (23 DEG C) and low temperature (0
DEG C, -10 DEG C, -30 DEG C) keep the temperature 4h in environment, shock-testing is quickly carried out after taking-up in identical environment temperature.Every group of sample is surveyed
Examination 10 calculates breakage rate.
Tensile property test
Tensile property is tested by GB/T1040.2-2006, and rate of extension 50mm/min, every group of batten tests 5,
It is averaged.Cryogenic stretching performance is tested by GB/T9979-2005, i.e., sample is placed in high-low temperature test chamber, test temperature
Degree is respectively 0 DEG C, -10 DEG C, -20 DEG C, -30 DEG C, keeps the temperature 15min, and rate of extension 50mm/min, takes by every group sample testing 5
Average value.
The high-intensitive cold-resistant PP-R composite material performance characterization of table 1
As shown in Table 1, high-intensitive cold-resistant PP-R composite material prepared by the present invention, under cryogenic,
Impact resistant strength is high, and excellent in mechanical performance is minimum by low temperature effect, excellent combination property.
Claims (10)
1. a kind of preparation method of high-intensitive cold-resistant PP-R composite material, which is characterized in that specific preparation step
Are as follows:
(1) by polypropylene random copolymer material, modified carbon fiber, SiC Nanometer Whiskers, odium stearate, glycerine, antioxidant
1010 are placed in high-speed mixer, are stirred 20~30min under room temperature with 800~1000r/min revolving speed, obtain mixture；
(2) mixing material is placed in 15~20min of mixing, extruding pelletization in double screw extruder and obtains mixing pellet；
(4) mixing pellet is placed in pressure maintaining in injection molding machine and is molded 6~10s, room temperature cooling obtains high-intensitive cold-resistant random copolymerization poly- third
Alkene composite material.
2. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 1, special
Sign is that the polypropylene random copolymer material, SiC Nanometer Whiskers, odium stearate, glycerine, resists modified carbon fiber
The parts by weight of oxygen agent 1010 are 80~100 parts of polypropylene random copolymer materials, 16~20 parts of modified carbon fibers, 20~25 parts of carbonizations
Silicon nanocrystal palpus, 8~10 parts of odium stearate, 4~5 parts of glycerine, 0.4~0.5 part of antioxidant 1010.
3. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 1, special
Sign is, each area's temperature of double screw extruder described in step (2) be respectively 220 DEG C of area's temperature, 230 DEG C of two area's temperature,
Three 220 DEG C of area's temperature, 210 DEG C of four area's temperature, 190 DEG C of die head temperature.
4. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 1, special
Sign is that the condition of the injection molding of pressure maintaining described in step (3) is 190 DEG C~230 DEG C of temperature, 50~60MPa of pressure.
5. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 1, special
Sign is, the specific preparation step of SiC Nanometer Whiskers described in step (1) are as follows:
(1) nano silica, carbon black are placed in blender, under room temperature with 200~250r/min revolving speed stirring 20~
30min obtains mixed-powder:
(2) mixed-powder is placed in graphite crucible, and spreads carbon fiber, be placed in tube-type atmosphere furnace, be passed through argon gas protection, rise
To 1600~1700 DEG C, heat preservation 8~10h of calcining cools to room temperature with the furnace, obtains SiC Nanometer Whiskers temperature.
6. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 5, special
Sign is, the nano silica, carbon black, carbon fiber parts by weight be 20~30 parts of nano silicas, 10~15 parts
Carbon black, 8~12 parts of carbon fibers.
7. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 5, special
Sign is that the rate that is passed through of argon gas described in step (2) is 120~160mL/min, and heating rate is 20 DEG C/min.
8. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 1, special
Sign is that the specific preparation step of modified carbon fiber described in step (1) is
(1) acid potassium bichromate is added in nitric acid, 12~16min is stirred with 160~180r/min revolving speed under room temperature, is obtained acid
Modification liquid；
(2) carbon fiber is added in acid modification liquid, with the stirring of 300~400r/min revolving speed under 70~80 DEG C of water bath condition
1~2h obtains carbon fiber suspension；
(3) carbon fiber suspension is placed in ultrasonic dispersing machine, 40~60min is ultrasonically treated under conditions of 60~70 DEG C,
Filtering, takes filter cake, is washed with deionized to neutrality, is placed in 50~60 DEG C of baking oven dry 1~2h, and shearing obtains carbon modified
Fiber.
9. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 8, special
Sign is, the carbon fiber, acid potassium bichromate, nitric acid parts by weight be 20~30 parts of carbon fibers, 4~6 parts of acid weight chromium
The nitric acid of sour potassium, 60~90 parts of mass fractions 30%.
10. a kind of preparation method of high-intensitive cold-resistant PP-R composite material according to claim 8, special
Sign is that the power of ultrasonic treatment described in step (3) is 400~500W, and the average length of modified carbon fiber is 6~8mm.
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| CN113774564A (en) * | 2021-10-20 | 2021-12-10 | 河南迪怡疗护科技开发有限公司 | Tear-resistant antibacterial non-woven fabric and preparation method thereof |
| CN113774564B (en) * | 2021-10-20 | 2022-11-22 | 江苏奥特隆新材料有限公司 | Anti-tear and antibacterial non-woven fabric and preparation method thereof |
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