CN115612287A - Modified cast nylon composition and preparation method thereof - Google Patents
Modified cast nylon composition and preparation method thereof Download PDFInfo
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- CN115612287A CN115612287A CN202110786314.9A CN202110786314A CN115612287A CN 115612287 A CN115612287 A CN 115612287A CN 202110786314 A CN202110786314 A CN 202110786314A CN 115612287 A CN115612287 A CN 115612287A
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- 239000004677 Nylon Substances 0.000 title claims abstract description 69
- 229920001778 nylon Polymers 0.000 title claims abstract description 69
- 239000000203 mixture Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000005266 casting Methods 0.000 claims abstract description 46
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims abstract description 21
- 239000006229 carbon black Substances 0.000 claims abstract description 21
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims abstract description 21
- MOMGDEWWZBKDDR-UHFFFAOYSA-M sodium;3,4,5,6-tetrahydro-2h-azepin-7-olate Chemical compound [Na+].O=C1CCCCC[N-]1 MOMGDEWWZBKDDR-UHFFFAOYSA-M 0.000 claims abstract description 21
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- AKNMPWVTPUHKCG-UHFFFAOYSA-N 2-cyclohexyl-6-[(3-cyclohexyl-2-hydroxy-5-methylphenyl)methyl]-4-methylphenol Chemical compound OC=1C(C2CCCCC2)=CC(C)=CC=1CC(C=1O)=CC(C)=CC=1C1CCCCC1 AKNMPWVTPUHKCG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 239000012257 stirred material Substances 0.000 claims description 2
- 230000032683 aging Effects 0.000 abstract description 12
- 230000014759 maintenance of location Effects 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000003756 stirring Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 238000003878 thermal aging Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 229920002292 Nylon 6 Polymers 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000007142 ring opening reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
- C08G69/16—Preparatory processes
- C08G69/18—Anionic polymerisation
-
- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyamides (AREA)
Abstract
The invention discloses a modified casting nylon composition and a preparation method thereof, wherein the modified casting nylon composition is prepared from 100 parts by weight of caprolactam, 0-30 parts by weight of laurolactam, 1-2 parts by weight of sodium caprolactam, 0.3-0.5 part by weight of hexamethylene diisocyanate, 2-6 parts by weight of carbon black and 0.5-1.5 parts by weight of antioxidant ZKF by a casting method. The modified casting nylon composition has excellent heat aging resistance, the retention rate of the mechanical properties of the modified casting nylon composition after 2000h heat aging is high, the service life of the casting nylon in a high-temperature environment can be obviously prolonged, and the safety of the casting nylon in the high-temperature environment is ensured.
Description
Technical Field
The invention belongs to the technical field of polymer composite materials, and particularly relates to a modified cast nylon composition and a preparation method thereof.
Background
Cast nylon (MC nylon), also known as monomer cast nylon, is typically a blank of an article formed by direct polymerization of caprolactam monomer in a mold under the action of a strong base (e.g., naoH) and some co-catalyst. Because the polymerization and the forming process are combined, the forming is convenient, the equipment investment is low, and the large machine parts are easy to manufacture. And the mechanical property and the physical property of the cast nylon are better than those of common nylon, so the application is wide.
The most important variety in monomer casting nylon is monomer casting nylon 6, also called MC nylon 6, the physical and mechanical properties of which are superior to those of common nylon 6, and the monomer casting nylon has better strength, rigidity, toughness, wear resistance and chemical stability; the water absorption rate is low, and the dimensional stability is good; and has self-extinguishing properties. The excellent performance of the nylon makes the monomer casting nylon widely used in the mechanical industry field to manufacture large products which are difficult to be injection molded, such as large gears, large valve seats, large worm gears, large shaft sleeves, bearing bushes and the like. It is especially suitable for making bearing with high load and high speed operation. In addition, it is also used for manufacturing guide rings, guide rails, roller sleeves, friction plates, conveyor pulleys, support stands, shuttles, bushings, augers, and the like. It can also be used for manufacturing plates, pipes, bars and the like.
Most of monomer casting nylon products are in high temperature environment, and because of being in high temperature environment for a long time, the casting nylon may be degraded, so that the performance of the casting nylon is degraded, and the use of the casting nylon is affected. Especially, the deterioration of mechanical properties, such as tensile strength, notch impact strength, etc., will seriously affect the life and safety of the product.
Disclosure of Invention
In view of the above, the present invention needs to provide a modified cast nylon composition and a preparation method thereof, the preparation method is simple, the thermal aging resistance of the cast nylon can be significantly improved, and the obtained modified cast nylon has excellent mechanical properties and good mechanical property retention rate even in a high temperature environment for a long time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a modified casting nylon composition which is prepared from 100 parts of caprolactam, 0-30 parts of laurolactam, 1-2 parts of sodium caprolactam, 0.3-0.5 part of hexamethylene diisocyanate, 2-6 parts of carbon black and 0.5-1.5 parts of antioxidant ZKF by a casting method.
According to the invention, caprolactam is used as a raw material, sodium caprolactam is used as a catalyst, hexamethylene diisocyanate is used as an initiator to synthesize the casting nylon, and carbon black and an antioxidant ZKF are added to be used as a thermal ageing-resistant additive, so that the prepared casting nylon has excellent thermal ageing-resistant capability. In addition, a proper amount of laurolactam is added in the synthesis process, and the laurolactam and caprolactam can be subjected to ring opening simultaneously to form copolymerization, so that the toughness of the cast nylon composition can be increased, the viscosity of the caprolactam in the melting process can be adjusted, and carbon black is uniformly dispersed in the caprolactam, thereby further improving the heat aging resistance of the cast nylon composition.
In a further embodiment, the sodium caprolactam and the hexamethylene diisocyanate are not particularly limited, and in order to ensure the purity of the modified cast nylon, in one or more embodiments of the present invention, the sodium caprolactam and the hexamethylene diisocyanate are analytically pure, wherein the purity of the sodium caprolactam is greater than or equal to 98%, and the purity of the hexamethylene diisocyanate is greater than or equal to 99%.
In a further scheme, the particle size of the carbon black is 10-20 mu m, and the specific surface area is 300-500m 2 /g。
The invention also provides a preparation method of the modified casting nylon composition, which comprises the following steps:
mixing 100 parts by weight of caprolactam, 0-30 parts by weight of laurolactam, 1-2 parts by weight of sodium caprolactam, 2-6 parts by weight of carbon black and 0.3-0.6 part by weight of antioxidant ZKF, heating to 135-145 ℃, removing water under negative pressure, and maintaining vacuum degree;
after the normal pressure is recovered, 0.3 to 0.5 part of hexamethylene diisocyanate is added into the mixture, and the mixture is quickly and uniformly stirred to prepare the modified casting nylon composition by a casting method.
The preparation of the cast nylon in the invention is not particularly limited, and the existing cast nylon preparation method in the field is adopted, and the difference is that the auxiliary agent is added in the preparation process, and the specific parameters can be adjusted according to the needs, so that the concrete description is not provided here
Further, in one or more embodiments of the invention, the time for the negative pressure water removal is 3-5min.
Further, in one or more embodiments of the present invention, the vacuum pressure is 0.01 to 0.05MPa.
In a further scheme, the casting method comprises the following specific steps: and adding the uniformly stirred materials into a mold with the temperature of 150-190 ℃, and curing for 15-30min to obtain the modified cast nylon composition.
Compared with the prior art, the invention has the following beneficial effects:
according to the modified casting nylon composition, the carbon black and the antioxidant ZKF are added into the raw material formula to serve as the compound antioxidant, so that the heat aging resistance of the modified casting nylon composition is remarkably improved, the modification process is carried out in the process of preparing the nylon composition by a casting method, and therefore, the modified casting nylon composition does not need to be blended with other auxiliary agents subsequently, the process is simple, and the efficiency is high. The obtained modified cast nylon composition has excellent mechanical properties even under a high temperature environment for a long period of time.
In addition, the modified casting nylon composition is also added with the laurolactam, which can be subjected to ring opening simultaneously with the caprolactam to form copolymerization, so that the toughness of the casting nylon composition can be increased, and the viscosity of the caprolactam during melting can be adjusted, so that the carbon black is uniformly dispersed in the caprolactam, and the heat aging resistance of the casting nylon composition is further improved.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The specific information of the raw materials in the following examples is as follows:
caprolactam and laurolactam are both produced by basf, germany, technical grade;
the sodium caprolactam is produced by Pasteur Germany, and has analytical purity, and the purity is more than or equal to 98 percent;
hexamethylene diisocyanate is purchased from Shandong Hao Shu chemical industry, and has analytical purity, and the purity is more than or equal to 99 percent;
the carbon black is new material high-blackness carbon black 111 of Wangtai in Anyang, the average particle size is 15 mu m, the specific surface area is 360m 2 /g；
Antioxidant ZKF was purchased from Guangdao Australia Biotech, hubei.
It should be understood that the above raw materials are only examples for making the technical solution of the present invention more clear, and do not represent that the present invention can only adopt the above raw materials, and the specific scope is subject to the claims. In addition, "part(s)" and "part(s)" as used herein refer to part(s) by weight unless otherwise specified.
Example 1
Putting 101 parts of caprolactam, 5 parts of sodium caprolactam, 2 parts of carbon black and 0.3 part of antioxidant ZKF into a reaction kettle, heating to 145 ℃, closing the kettle, opening a pump, performing negative pressure dewatering for 5min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.3 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 190 ℃ for 15 minutes, and preparing the modified cast nylon composition.
Example 2
Putting 100 parts of caprolactam, 10 parts of laurolactam, 1.5 parts of sodium caprolactam, 4 parts of carbon black and 1 part of antioxidant ZKF into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, removing water for 4min under negative pressure, and keeping the vacuum degree at 0.03MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 180 ℃ for 20 minutes, and preparing the modified cast nylon composition.
Example 3
Putting 100 parts of caprolactam, 30 parts of laurolactam, 2 parts of sodium caprolactam, 6 parts of carbon black and 0.6 part of antioxidant ZKF into a reaction kettle, heating to 135 ℃, closing the kettle, opening a pump, performing negative pressure dewatering for 3min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.5 part of hexamethylene diisocyanate, quickly and uniformly stirring, and then casting into a mold, wherein the mold temperature is 150 ℃, and the curing time is maintained for 15-30 minutes to prepare the modified cast nylon composition.
Example 4
Putting 100 parts of caprolactam, 20 parts of laurolactam, 2 parts of sodium caprolactam, 4 parts of carbon black and 0.5 part of antioxidant ZKF into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, performing negative pressure dehydration for 5min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly and uniformly stirring, casting into a mold, keeping the curing time for 30 minutes at the temperature of 170 ℃, and preparing the modified cast nylon composition.
Example 5
Putting 120 parts of caprolactam, 2 parts of sodium caprolactam, 4 parts of carbon black and 0.5 part of antioxidant ZKF into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, performing negative pressure dewatering for 5min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 170 ℃ for curing time for 30 minutes, and preparing the modified cast nylon composition.
Comparative example 1
Putting 100 parts of caprolactam, 20 parts of laurolactam, 2 parts of sodium caprolactam and 4.5 parts of carbon black into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, carrying out negative pressure dehydration for 5min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 170 ℃ for curing time for 30 minutes, and preparing the modified cast nylon composition.
Comparative example 2
Putting 100 parts of caprolactam, 20 parts of laurolactam, 2 parts of sodium caprolactam and 4.5 parts of antioxidant ZKF into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, removing water for 5min under negative pressure, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 170 ℃ for curing time for 30 minutes, and preparing the modified cast nylon composition.
Comparative example 3
Putting 100 parts of caprolactam, 20 parts of laurolactam, 2 parts of sodium caprolactam, 4 parts of carbon black and 0.5 part of antioxidant 1010 into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, performing negative pressure dewatering for 5min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 170 ℃ for curing time for 30 minutes, and preparing the modified cast nylon composition.
Comparative example 4
Putting 100 parts of caprolactam, 20 parts of laurolactam, 2 parts of sodium caprolactam, 4 parts of carbon black and 0.5 part of antioxidant 2246 into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, removing water for 5min under negative pressure, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly stirring uniformly, casting into a mold, keeping the mold temperature at 170 ℃ for curing time for 30 minutes, and preparing the modified cast nylon composition.
Comparative example 5
Putting 100 parts of caprolactam, 20 parts of laurolactam, 2 parts of sodium caprolactam, 2.25 parts of antioxidant 168 and 2.25 parts of antioxidant 1010 into a reaction kettle, heating to 140 ℃, closing the kettle, opening a pump, performing negative pressure dehydration for 5min, and keeping the vacuum degree at 0.01MPa;
and (3) turning off a pump, opening the kettle after the normal pressure is recovered, adding 0.4 part of hexamethylene diisocyanate, quickly and uniformly stirring, casting into a mold, keeping the curing time for 30 minutes at the temperature of 170 ℃, and preparing the modified cast nylon composition.
Test example
The modified cast nylon compositions prepared in examples and comparative examples were subjected to respective performance tests, and the results are shown in Table 1.
TABLE 1 modified cast nylon compositions Performance test results
Note: in Table 1, the modified cast nylon compositions were injection molded into test bars using ASTM standards, where bar dimensions (length x width x thickness) are:
tensile bars (dumbbell type) of 170mm by 13mm by 3.2mm, tensile strength measured using ASTM D638 standard, tensile speed 5mm/min; (ii) a
Notched impact bars, 127mm by 13mm by 3.2mm, V notches, notch depth of 1/5, notched impact strength using ASTM D6110 standard test.
The thermal aging resistance test specifically comprises the following steps: the blast type constant temperature drying oven is used, the fluctuation and average temperature of the temperature are +/-1 ℃, and the aging temperature of the material is 160 ℃.
From the results after the test, the mechanical property retention of the modified cast nylon composition after heat aging was calculated, and the results are shown in table 2.
TABLE 2 mechanical property retention of modified cast nylon compositions after 2000h heat aging
Note: in table 2, the tensile strength retention ratio% = tensile strength after heat aging/tensile strength before heat aging × 100%;
notched impact strength retention% = notched impact strength after thermal aging/notched impact strength before thermal aging × 100%.
The test results in tables 1 and 2 show that the long-term thermal aging resistance of the modified cast nylon is obviously improved, the tensile strength retention rate is over 75% after 2000h thermal aging, and the notch impact strength retention rate is over 70%, so that the modified cast nylon has obvious advantages in improving the service life of the cast nylon in a high-temperature environment and improving the use safety.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (8)
1. The modified casting nylon composition is characterized by being prepared from 100 parts by weight of caprolactam, 0-30 parts by weight of laurolactam, 1-2 parts by weight of sodium caprolactam, 0.3-0.5 part by weight of hexamethylene diisocyanate, 2-6 parts by weight of carbon black and 0.5-1.5 parts by weight of antioxidant ZKF through a casting method.
2. The modified cast nylon composition of claim 1, wherein the sodium caprolactam has a purity of 98% or more.
3. The modified cast nylon composition of claim 1, wherein the hexamethylene diisocyanate has a purity of 99% or more.
4. The modified cast nylon composition of claim 1, wherein the carbon black has a particle size of 10 to 20 μm and a specific surface area of 300 to 500m 2 /g。
5. A preparation method of a modified casting nylon composition is characterized by comprising the following steps:
mixing 100 parts of caprolactam, 0-30 parts of laurolactam, 1-2 parts of sodium caprolactam, 2-6 parts of carbon black and 0.3-0.6 part of antioxidant ZKF in parts by weight, heating to 135-145 ℃, removing water under negative pressure, and keeping the vacuum degree;
after the normal pressure is recovered, 0.3 to 0.5 part of hexamethylene diisocyanate is added into the mixture, and the mixture is quickly and uniformly stirred to prepare the modified casting nylon composition by a casting method.
6. The method of claim 5, wherein the time for negative pressure water removal is 3-5min.
7. The production method according to claim 5, wherein the pressure of the vacuum degree is 0.01 to 0.05MPa.
8. The method according to claim 5, wherein the casting method comprises the following specific steps: and adding the uniformly stirred materials into a mold with the temperature of 150-190 ℃, and curing for 15-30min to obtain the modified cast nylon composition.
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2021
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