CN115894898A - Quaternary copolymerized polyamide PA56IT and preparation method thereof - Google Patents
Quaternary copolymerized polyamide PA56IT and preparation method thereof Download PDFInfo
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- CN115894898A CN115894898A CN202110894844.5A CN202110894844A CN115894898A CN 115894898 A CN115894898 A CN 115894898A CN 202110894844 A CN202110894844 A CN 202110894844A CN 115894898 A CN115894898 A CN 115894898A
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- 239000004952 Polyamide Substances 0.000 title claims abstract description 42
- 229920002647 polyamide Polymers 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000002834 transmittance Methods 0.000 claims abstract description 6
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 64
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 56
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 claims description 40
- VHRGRCVQAFMJIZ-UHFFFAOYSA-N cadaverine Chemical compound NCCCCCN VHRGRCVQAFMJIZ-UHFFFAOYSA-N 0.000 claims description 32
- KJOMYNHMBRNCNY-UHFFFAOYSA-N pentane-1,1-diamine Chemical compound CCCCC(N)N KJOMYNHMBRNCNY-UHFFFAOYSA-N 0.000 claims description 22
- 239000012266 salt solution Substances 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 239000000654 additive Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- -1 mold release aids Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- 239000012298 atmosphere Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000012760 heat stabilizer Substances 0.000 claims description 5
- 239000004609 Impact Modifier Substances 0.000 claims description 4
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 4
- 239000012963 UV stabilizer Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 4
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000975 dye Substances 0.000 claims description 4
- 239000013538 functional additive Substances 0.000 claims description 4
- SYECJBOWSGTPLU-UHFFFAOYSA-N hexane-1,1-diamine Chemical compound CCCCCC(N)N SYECJBOWSGTPLU-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 239000000314 lubricant Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000004014 plasticizer Substances 0.000 claims description 4
- 239000002516 radical scavenger Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000003623 enhancer Substances 0.000 claims description 3
- 230000009477 glass transition Effects 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- FDQSRULYDNDXQB-UHFFFAOYSA-N benzene-1,3-dicarbonyl chloride Chemical compound ClC(=O)C1=CC=CC(C(Cl)=O)=C1 FDQSRULYDNDXQB-UHFFFAOYSA-N 0.000 claims description 2
- JLVWYWVLMFVCDI-UHFFFAOYSA-N diethyl benzene-1,3-dicarboxylate Chemical compound CCOC(=O)C1=CC=CC(C(=O)OCC)=C1 JLVWYWVLMFVCDI-UHFFFAOYSA-N 0.000 claims description 2
- ONIHPYYWNBVMID-UHFFFAOYSA-N diethyl benzene-1,4-dicarboxylate Chemical compound CCOC(=O)C1=CC=C(C(=O)OCC)C=C1 ONIHPYYWNBVMID-UHFFFAOYSA-N 0.000 claims description 2
- VNGOYPQMJFJDLV-UHFFFAOYSA-N dimethyl benzene-1,3-dicarboxylate Chemical compound COC(=O)C1=CC=CC(C(=O)OC)=C1 VNGOYPQMJFJDLV-UHFFFAOYSA-N 0.000 claims description 2
- 150000002531 isophthalic acids Chemical class 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 150000003503 terephthalic acid derivatives Chemical class 0.000 claims description 2
- LXEJRKJRKIFVNY-UHFFFAOYSA-N terephthaloyl chloride Chemical compound ClC(=O)C1=CC=C(C(Cl)=O)C=C1 LXEJRKJRKIFVNY-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000007789 gas Substances 0.000 description 16
- 229920006122 polyamide resin Polymers 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 239000003963 antioxidant agent Substances 0.000 description 8
- 230000003078 antioxidant effect Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 229910001382 calcium hypophosphite Inorganic materials 0.000 description 7
- 229940064002 calcium hypophosphite Drugs 0.000 description 7
- 238000007865 diluting Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000011056 performance test Methods 0.000 description 7
- CNALVHVMBXLLIY-IUCAKERBSA-N tert-butyl n-[(3s,5s)-5-methylpiperidin-3-yl]carbamate Chemical compound C[C@@H]1CNC[C@@H](NC(=O)OC(C)(C)C)C1 CNALVHVMBXLLIY-IUCAKERBSA-N 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000007858 starting material Substances 0.000 description 6
- 229920002521 macromolecule Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MHZGKXUYDGKKIU-UHFFFAOYSA-N Decylamine Chemical compound CCCCCCCCCCN MHZGKXUYDGKKIU-UHFFFAOYSA-N 0.000 description 2
- BTZVDPWKGXMQFW-UHFFFAOYSA-N Pentadecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCCC(O)=O BTZVDPWKGXMQFW-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- QQHJDPROMQRDLA-UHFFFAOYSA-N hexadecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCCCC(O)=O QQHJDPROMQRDLA-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 2
- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 2
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 description 2
- LWBHHRRTOZQPDM-UHFFFAOYSA-N undecanedioic acid Chemical compound OC(=O)CCCCCCCCCC(O)=O LWBHHRRTOZQPDM-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- QFGCFKJIPBRJGM-UHFFFAOYSA-N 12-[(2-methylpropan-2-yl)oxy]-12-oxododecanoic acid Chemical compound CC(C)(C)OC(=O)CCCCCCCCCCC(O)=O QFGCFKJIPBRJGM-UHFFFAOYSA-N 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229920006020 amorphous polyamide Polymers 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- HIAAVKYLDRCDFQ-UHFFFAOYSA-L calcium;dodecanoate Chemical compound [Ca+2].CCCCCCCCCCCC([O-])=O.CCCCCCCCCCCC([O-])=O HIAAVKYLDRCDFQ-UHFFFAOYSA-L 0.000 description 1
- UJPOLGDCBGQHSF-UHFFFAOYSA-L calcium;heptadecanoate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCC([O-])=O UJPOLGDCBGQHSF-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229910001380 potassium hypophosphite Inorganic materials 0.000 description 1
- CRGPNLUFHHUKCM-UHFFFAOYSA-M potassium phosphinate Chemical compound [K+].[O-]P=O CRGPNLUFHHUKCM-UHFFFAOYSA-M 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 150000003384 small molecules Chemical group 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 229940045845 sodium myristate Drugs 0.000 description 1
- 229950005425 sodium myristyl sulfate Drugs 0.000 description 1
- JUQGWKYSEXPRGL-UHFFFAOYSA-M sodium;tetradecanoate Chemical compound [Na+].CCCCCCCCCCCCCC([O-])=O JUQGWKYSEXPRGL-UHFFFAOYSA-M 0.000 description 1
- UPUIQOIQVMNQAP-UHFFFAOYSA-M sodium;tetradecyl sulfate Chemical compound [Na+].CCCCCCCCCCCCCCOS([O-])(=O)=O UPUIQOIQVMNQAP-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- DXNCZXXFRKPEPY-UHFFFAOYSA-N tridecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCC(O)=O DXNCZXXFRKPEPY-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- CYTQBVOFDCPGCX-UHFFFAOYSA-N trimethyl phosphite Chemical compound COP(OC)OC CYTQBVOFDCPGCX-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
The invention discloses a quaternary copolymerized polyamide PA56IT and a preparation method thereof. The quaternary copolyamide PA56IT provided by the invention has high light transmittance and transparency, excellent mechanical properties, and is economical and practical. The preparation method of the quaternary copolyamide PA56IT is simple, the process parameters are easy to control, and the quantitative production is convenient to carry out.
Description
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to a quaternary copolyamide PA56IT with high light transmittance and excellent mechanical properties, and a preparation method and application thereof.
Background
The polyamide has excellent mechanical properties and molding properties, and is widely applied to processing of original parts such as automobile parts, parts of electrical and electronic equipment, spectacle frames, spectacle lenses or other lenses, cups/bottles for drinking water treatment and the like. However, since the molecular chain arrangement of ordinary polyamide is regular and the transparency is poor, it is difficult to exert the function in a special field.
In the actual use process of the traditional transparent plastic, the requirements of specific use scenes cannot be completely met, for example, the main transparent plastics PC (polycarbonate) and PMMA (polymethyl methacrylate) in the market have the problems of small molecule residue, poor chemical corrosion resistance, poor wear resistance and the like. The polyamide macromolecules contain amide groups with strong polarity, terminal amino groups and terminal carboxyl groups, the groups have strong interaction and easily form hydrogen bonds, so that the polyamide macromolecules are easy to highly crystallize, and the size of spherulites formed by the polyamide is often larger than the wavelength (400-700 nm) of visible light, so that the polyamide macromolecules are opaque. In order to produce polyamides with higher transparency, amorphous polyamides can be produced by reducing the crystallinity; reducing the crystal size to within the visible wavelength range; optimizing blending, copolymerization, etc. to approximate the refractive indices of the crystalline and amorphous regions, but these approaches may result in loss of other properties, such as reduced hardness, reduced heat distortion temperature, and even loss of value of the polyamide due to inhibition of crystallization, and the cyclic aliphatic amines with pendant groups often used in some commercially available transparent polyamides tend to be expensive.
Disclosure of Invention
The invention aims to provide a PA56IT quaternary copolyamide which has high light transmittance and transparency, excellent mechanical properties, economy and practicability and a preparation method and application thereof by specifying the chain distribution and amorphous characteristics of amido bonds in the quaternary copolyamide.
The invention provides a quaternary copolyamide PA56IT, wherein the quaternary copolyamide PA56IT comprises structural units shown as formulas (I), (II) and (III):
wherein, in the quaternary copolyamide PA56IT,
the mol fraction of the structural unit (I) is 20-60;
the mol fraction of the structural unit (II) is 0 to 25 parts;
the mole fraction of the structural unit (III) is 35-60;
the mole fraction of the structural unit (IV) is 1-30;
the sum of the molar parts of the structural units (I), (II), (III) and (IV) is 100 parts;
preferably, the content of the structural units (I), (II), (III) and (IV) in the quaternary copolyamide PA56IT is 95% or more, preferably 97% or more.
In one embodiment, the ratio of the sum of the molar parts of the structural units (I), (II) to the sum of the molar parts of the structural units (III), (IV) is 1;
preferably, the molar fraction of the structural unit (I) is from 30 to 50 parts, such as 30 parts, 35 parts, 40 parts, 45 parts, 48 parts, 50 parts;
preferably, the molar fraction of the structural unit (II) is from 0 to 20 parts, such as 5 parts, 10 parts, 15 parts;
preferably, the molar ratio of the structural units (I) to (II) is 3 to 5;
preferably, the molar ratio of the structural units (I) to (III) is 3 to 5;
preferably, the molar ratio of the structural units (I), (II) and (III) is 3 to 5:0.01 to 2:4 to 5.
Preferably, the molar fraction of the structural unit (I) is 60 to 100%, for example 70%, 80%, 90%, relative to the sum of the molar fractions of the structural units (I), (II).
In one embodiment, the quaternary copolyamide PA56IT has a number average molecular weight of 10000 to 50000, for example 20000 to 30000; and/or the presence of a gas in the atmosphere,
the quaternary copolyamide PA56IT has a relative viscosity of 1.60 to 3.0, preferably 1.8 to 2.7, for example 1.8 to 2.3; and/or the presence of a gas in the gas,
the glass transition temperature of the quaternary copolymerized polyamide PA56IT is 128-145 ℃, and preferably 129-142 ℃; and/or the presence of a gas in the gas,
the tensile strength of the quaternary copolyamide PA56IT is 80-130 MPa, preferably 90-100 MPa; and/or the presence of a gas in the atmosphere,
the bending strength of the quaternary copolyamide PA56IT is 140-175 MPa, preferably 145-155 MPa; and/or the presence of a gas in the gas,
the IZOD defect of the quaternary copolyamide PA56ITThe impact strength of the mouth is 7.0-12.0 KJ/m 2 Preferably 8.0 to 9.0KJ/m 2 (ii) a And/or the presence of a gas in the atmosphere,
the haze of the quaternary copolyamide PA56IT is less than 6.0%, preferably less than 4.5%; and/or the presence of a gas in the gas,
the light transmittance of the quaternary copolyamide PA56IT is more than 85%, and more preferably more than 90%.
In one embodiment, the quaternary copolyamide PA56IT further comprises additives including end-capping agents, UV stabilizers, heat stabilizers, radical scavengers and/or processing aids, impurity inhibitors, lubricants, mold release aids, plasticizers, functional additives for influencing optical properties, in particular refractive index, impact modifiers, nanofillers and/or additives, gloss enhancers, dyes or mixtures thereof; and/or the presence of a gas in the atmosphere,
the content of the additive in the quaternary copolyamide PA56IT is 5% or less, and more preferably 3% or less. The percentages are mass percentages.
In one embodiment, the starting material for the quaternary copolyamide PA56IT comprises the following monomers:
35-60 parts of pentamethylene diamine;
1-30 parts of hexamethylene diamine;
0 to 25 parts, more preferably 0 to 20 parts, of terephthalic acid and/or a derivative thereof;
20 to 60 parts of isophthalic acid and/or a derivative thereof, and more preferably 30 to 55 parts;
wherein all parts are calculated as molar parts.
In one embodiment, the pentamethylene diamine is of chemical or biological origin, preferably of biological origin; and/or the presence of a gas in the gas,
the terephthalic acid derivative is one or more selected from terephthaloyl chloride, dimethyl terephthalate and diethyl terephthalate; and/or the presence of a gas in the gas,
the isophthalic acid derivative is selected from one or more of isophthalic chloride, dimethyl isophthalate and diethyl isophthalate.
In one embodiment, the raw material of the tetrapolyamide PA56IT further comprises additives including end-capping agents, UV stabilizers, heat stabilizers, radical scavengers and/or processing aids, impurity inhibitors, lubricants, mold release aids, plasticizers, functional additives for influencing optical properties, in particular the refractive index, impact modifiers, nanofillers and/or additives, brighteners, dyes or mixtures thereof.
In one embodiment, the blocking agent preferably includes one or more of a monobasic acid, a dibasic acid, a monoamine or a diamine, and further preferably includes one or more of acetic acid, benzoic acid, stearic acid, lauric acid, succinic acid, adipic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, and one or more of decylamine, dodecylamine, hexamethylenediamine, decylamine, and the like.
In one embodiment, the heat stabilizer preferably comprises one or more of phosphoric acid, phosphorous acid, trimethyl phosphite, triphenyl phosphite, trimethyl phosphate, triphenyl phosphate, sodium hypophosphite, zinc hypophosphite, calcium hypophosphite, and potassium hypophosphite.
In one embodiment, the crystallization promoter preferably includes a long carbon chain carboxylic acid metal salt, the number of carbon atoms of the long carbon chain carboxylic acid is preferably 10 to 30, and the metal preferably includes one or more of calcium, magnesium and zinc, and may be, for example, one or more of a long carbon chain carboxylic acid calcium salt, a long carbon chain carboxylic acid magnesium salt or a long carbon chain carboxylic acid zinc salt, and further may be one or more of calcium laurate, sodium myristate, calcium heptadecanoate, calcium stearate, sodium lauryl sulfate and sodium myristyl sulfate.
In one embodiment, the inorganic filler preferably includes one or more of glass fiber, glass bead, carbon fiber, carbon black, and graphite.
In one embodiment, the mineral, preferably, includes one or more additives of titanium dioxide, calcium carbonate and barium sulfate.
In another aspect of the present invention, there is provided a method for preparing the quaternary copolyamide PA56IT described above, comprising the steps of: mixing pentanediamine, hexanediamine, terephthalic acid and/or derivatives thereof and isophthalic acid and/or derivatives thereof with water according to the proportion of molar parts to prepare a polyamide salt solution; adjusting the pH value of the solution of the polyamide salt to make the pH value of the solution of the polyamide salt to be more than 8.0 when the concentration of the solution of the polyamide salt is 10 percent, raising the temperature to make the pressure in the reaction system to be 0.3-3.2 Mpa, such as 1.7Mpa and 2.0Mpa, keeping the pressure for 30-120 min, such as 50min, and then releasing the pressure to normal pressure; vacuumizing the reaction system for 20-100 min, such as 30min and 40min, and obtaining a melt at the temperature of 230-290 ℃, such as 240 ℃, 260 ℃ and 280 ℃ after the reaction is finished; and melting, discharging, drawing strips and cutting into granules to obtain the PA56IT resin.
In one embodiment, the ratio of the sum of the moles of terephthalic acid and/or its derivatives and isophthalic acid and/or its derivatives to the sum of the moles of pentamethylenediamine and hexamethylenediamine is 1:0.95 to 1.07, such as 1;
preferably, the molar part ratio of the isophthalic acid and/or the derivative thereof, the terephthalic acid and/or the derivative thereof and the pentanediamine is 3-5: 0.01 to 2:4 to 5;
preferably, the mole number of the isophthalic acid and/or the derivative thereof is 60 to 100% with respect to the sum of the mole numbers of the terephthalic acid and/or the derivative thereof and the isophthalic acid and/or the derivative thereof.
In one embodiment, the method is performed under a nitrogen or inert gas atmosphere, including argon or helium.
In one embodiment, the concentration of the polyamide salt solution is between 40 and 85%, said percentage being the mass percentage of the polyamide PA56IT salt solution, for example 50%,60%.
In one embodiment, the polyamide salt solution may be concentrated by heating to increase the concentration.
In one embodiment, the pH is 8.0 to 9.0, e.g., 8.3, 8.4, 8.5, the percentages being by mass of the polyamide PA56IT salt solution.
In one embodiment, the aforementioned additives are added to the polyamide salt solution in amounts of 100 to 2000ppm each (based on the total mass of the starting materials). For example, when the starting materials are pentamethylenediamine, terephthalic acid and isophthalic acid, the amount added is 100 to 2000ppm based on the sum of the masses of the starting materials.
In one embodiment, the aforementioned antioxidant is added to the polyamide salt solution in an amount of 200 to 1500ppm (based on the total mass of the raw materials), for example 300ppm, 700ppm, respectively.
In one embodiment, the end-capping agent is added to the polyamide salt solution in an amount of 100 to 1500ppm (based on the total mass of the starting materials), for example 100ppm.
In another aspect of the present invention, there is provided a molded article comprising the quaternary copolyamide PA56IT as described above as a raw material.
Compared with the prior art, the implementation of the invention has at least the following advantages:
1. the quaternary copolyamide PA56IT synthesized by the method not only has good transparent light transmission, but also has excellent mechanical properties, so that the quaternary copolyamide PA56IT can be used in more harsh use environments, and the use range of the transparent polyamide is expanded to a certain extent.
2. The preparation method of the quaternary copolyamide PA56IT is simple, the raw materials are low in price, the process parameters are easy to control, and the quantitative production is convenient.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventor selects the pentanediamine which is derived from a biological group and contains a single carbon number, and introduces a benzene ring structure in a molecular chain, controls the content ratio of monomers, and unexpectedly discovers that the obtained polyamide has high transparency, and has excellent mechanical properties such as tensile strength, bending strength and the like and excellent impact toughness, so that the polyamide can meet the requirements of different transparent products.
The polyamide and the preparation thereof according to one embodiment of the present invention will be further described with reference to the following specific examples.
The relevant tests involved are as follows:
1) Bending test: the test is according to the standard ISO 178-2010, and the test conditions are as follows: 2mm/min, spline size 10mm × 4mm × 80mm.
2) And (3) tensile test: the test is referred to the standard ISO 572-2-2012, and the test conditions are as follows: 50mm/min.
3) And (3) impact test: for notched Izod impact, reference is made to the test standard ISO 180/1A, test condition 23 ℃.
4) Light transmittance and haze: the test refers to a color plate with the national standard GB/T2410-2008 and the thickness of 2 mm.
5) Relative viscosity: concentrated sulfuric acid method by Ubbelohde viscometer: accurately weighing 0.25 +/-0.0002 g of dried polyamide resin slices, and adding 50mL of concentrated sulfuric acid (96 wt%) for dissolution; the time t0 for the concentrated sulfuric acid to flow through and the time t for the polyamide sample solution to flow through were measured and recorded in a thermostated water bath at 25 ℃. The viscosity number calculation formula is as follows: relative viscosity = t/t0; t-solution flow time; t 0-time of solvent flow.
6) Glass transition temperature (Tg): the temperature corresponding to the transition from the glass state to the high elastic state is detected by a differential scanning calorimetry method.
Pentanediamine was purchased from Kaiser (Jinxiang) biomaterials Inc., and hexanediamine, terephthalic acid, isophthalic acid were purchased from Chemicals, inc., national drug group. Other starting materials, reagents are either prepared by methods well known in the literature or are commercially available.
Example 1
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =30:20:40:10, a 50% strength polyamide salt solution was prepared, the pH of the solution was adjusted to 8.3 by diluting it to 10wt% using pentanediamine, and 300ppm of sodium hypophosphite as an antioxidant was added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 1.7MPa, maintaining the pressure for 50min, and then starting to release the pressure until the normal pressure is reached.
3. After the pressure of the reaction system is relieved to normal pressure, vacuumizing is carried out, the whole process lasts for 30min, and the material temperature after vacuumizing is controlled to be 240 ℃.
4. And (3) melting, discharging, drawing strips, and cutting into granules to obtain the transparent polyamide resin, wherein the performance test is shown in table 1.
Example 2
The transparent polyamide resin was prepared in the same manner as in example 1, except that the raw materials in step 1 were: uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylene diamine =35:15:45:5. transparent polyamide resins were obtained and the property tests are shown in table 1.
Example 3
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar fraction ratio is that the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =40:10:48:2, a 60% strength polyamide salt solution was prepared, the pH of the solution was adjusted to 8.4 by diluting it to 10% by weight with pentamethylene diamine, and 700ppm of calcium hypophosphite as an antioxidant was added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 1.7MPa, maintaining the pressure for 45min, and then starting to release the pressure until the normal pressure is reached.
3. And (3) after the pressure of the reaction system is relieved to normal pressure, vacuumizing is carried out, the whole process lasts for 40min, and the material temperature after vacuumizing is controlled to be 240 ℃.
4. And (3) melting, discharging, drawing strips, and cutting into granules to obtain the transparent polyamide resin, wherein the performance test is shown in table 1.
Example 4
The transparent polyamide resin was prepared in the same manner as in example 3, except that the raw materials in step 1 were: uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =45:5:45:5. transparent polyamide resins were obtained and the property tests are shown in table 1.
Example 5
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar ratio of the isophthalic acid: pentanediamine: hexamethylenediamine =50:45:5, a 60% strength polyamide salt solution was prepared, the pH of the solution was adjusted to 8.4 by diluting it to 10% by weight with pentamethylenediamine, and 700ppm of calcium hypophosphite as an antioxidant was added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 2.0MPa, maintaining the pressure for 50min, and then starting to release the pressure until the normal pressure is reached.
3. After the pressure of the reaction system is relieved to normal pressure, vacuumizing is carried out, the whole process lasts for 30min, and the material temperature after vacuumizing is controlled to be 260 ℃.
4. And (3) melting, discharging, drawing strips, and cutting into granules to obtain the transparent polyamide resin, wherein the performance test is shown in table 1.
Example 6
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =48:2:45:5, a solution of a 50% strength polyamide salt is prepared, the pH of the solution is adjusted to 8.5 by diluting it to 10% by weight with pentanediamine, and 300ppm of the antioxidant calcium hypophosphite is added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 1.7MPa, maintaining the pressure for 50min, and then starting to release the pressure until the normal pressure is reached.
3. After the pressure of the reaction system is relieved to normal pressure, vacuumizing is carried out, the whole process lasts for 30min, and the material temperature after vacuumizing is controlled to be 280 ℃.
4. And (3) melting, discharging, drawing strips, and cutting into granules to obtain the transparent polyamide resin, wherein the performance test is shown in table 1.
Example 7
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =48:2:45:5, a solution of a 50% strength polyamide salt is prepared, the pH of the solution is adjusted to 8.5 by diluting it to 10% by weight with pentanediamine, 300ppm of calcium hypophosphite as an antioxidant and 100ppm of acetic acid as an end-capping reagent are added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 1.7MPa, maintaining the pressure for 50min, and then starting to release the pressure until the normal pressure is reached.
3. And (3) after the pressure of the reaction system is relieved to normal pressure, vacuumizing, wherein the whole process lasts for 40min, and the material temperature after the vacuumizing is controlled to be 280 ℃.
4. And (3) melting, discharging, drawing strips, and cutting into granules to obtain the transparent polyamide resin, wherein the performance test is shown in table 1.
Comparative example 1
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =25:25:38:12, a solution of a 50% strength polyamide salt is prepared, the solution is adjusted to a pH of 8.5 by diluting it to 10% by weight with pentanediamine, and 700ppm of the antioxidant calcium hypophosphite are added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 1.7MPa, maintaining the pressure for 50min, and then starting to release the pressure until the normal pressure is reached.
3. And (3) after the pressure of the reaction system is relieved to normal pressure, vacuumizing, wherein the whole process lasts for 40min, and the material temperature after vacuumizing is controlled to be 240 ℃.
4. And (3) melting, discharging, drawing strips, and cutting into granules to obtain the polyamide resin, wherein the performance test is shown in table 1.
Comparative example 2
1. Under the condition of nitrogen, uniformly mixing isophthalic acid, terephthalic acid, pentamethylene diamine, hexamethylene diamine and water, wherein the molar ratio of the isophthalic acid: terephthalic acid: pentanediamine: hexamethylenediamine =28:22:33:17, a solution of a 50% strength polyamide salt is prepared, the solution is adjusted to a pH of 8.5 by diluting it to 10% by weight with pentanediamine, and 700ppm of the antioxidant calcium hypophosphite are added.
2. And (3) heating the obtained salt solution until the pressure in the reaction system is 1.7MPa, maintaining the pressure for 40min, and then starting to release the pressure until the normal pressure is reached.
3. After the pressure of the reaction system is relieved to normal pressure, vacuumizing is carried out, the whole process lasts for 38min, and the material temperature after vacuumizing is controlled to be 240 ℃.
4. And (4) melting, discharging, drawing strips, and cutting into granules to obtain the polyamide resin, wherein the performance test is shown in table 1.
TABLE 1
In conclusion, through comparison, the quaternary copolyamide PA56IT has very excellent comprehensive performance and has very wide application prospect in the field of general polyamides.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A quaternary copolyamide PA56IT, characterized in that the quaternary copolyamide PA56IT comprises structural units of the formulae (I), (II), (III) and (IV):
wherein, in the quaternary copolyamide PA56IT,
the mol fraction of the structural unit (I) is 20-60;
the mole fraction of the structural unit (II) is 0-25;
the mol fraction of the structural unit (III) is 35-60 parts;
the mol fraction of the structural unit (IV) is 1 to 30;
the sum of the molar parts of the structural units (I), (II), (III) and (IV) is 100 parts;
preferably, the content of the structural units (I), (II), (III) and (IV) in the quaternary copolyamide PA56IT is 95% or more, preferably 97% or more.
2. The tetrapolypolyamide PA56IT of claim 1 wherein the ratio of the sum of the molar parts of structural units (I), (II) to the sum of the molar parts of structural units (III), (IV) is 1.95 to 1.07;
preferably, the mole fraction of the structural unit (I) is 30 to 50 parts;
preferably, the mole fraction of the structural unit (II) is 0 to 20 parts;
preferably, the molar ratio of the structural units (I) to (II) is 3 to 5;
preferably, the molar ratio of the structural units (I) to (III) is 3 to 5;
preferably, the molar fraction of the structural unit (I) is 60 to 100% relative to the sum of the molar fractions of the structural units (I), (II).
3. The quaternary copolyamide PA56IT according to claim 1, wherein the quaternary copolyamide PA56IT has a number average molecular weight of 10000 to 50000; and/or the presence of a gas in the gas,
the relative viscosity of the quaternary copolyamide PA56IT is 1.60-3.0, preferably 1.8-2.7; and/or the presence of a gas in the atmosphere,
the glass transition temperature of the quaternary copolymerized polyamide PA56IT is 128-145 ℃, and preferably 129-142 ℃; and/or the presence of a gas in the gas,
the tensile strength of the quaternary copolyamide PA56IT is 80-130 MPa, preferably 90-100 MPa; and/or the presence of a gas in the gas,
the bending strength of the quaternary copolyamide PA56IT is 140-175 MPa, preferably 145-155 MPa; and/or the presence of a gas in the atmosphere,
the IZOD notch impact strength of the quaternary copolyamide PA56IT is 7.0-12.0 KJ/m 2 Preferably 8.0 to 9.0KJ/m 2 (ii) a And/or the presence of a gas in the gas,
the haze of the quaternary copolyamide PA56IT is less than 6.0%, preferably less than 4.5%; and/or the presence of a gas in the gas,
the light transmittance of the quaternary copolyamide PA56IT is more than 85%, and more preferably more than 90%.
4. The quaternary copolyamide PA56IT according to claim 1, further comprising additives including an end-capping agent, a UV stabilizer, a heat stabilizer, a radical scavenger and/or a processing aid, an impurity inhibitor, a lubricant, a mold release aid, a plasticizer, a functional additive for influencing optical properties, in particular refractive index, an impact modifier, a nanofiller and/or an additive, a gloss enhancer, a dye, or mixtures thereof; and/or the presence of a gas in the gas,
the content of the additive in the quaternary copolyamide PA56IT is 5% or less, and more preferably 3% or less.
5. The quaternary copolyamide PA56IT according to claim 1, wherein the raw materials of the quaternary copolyamide PA56IT comprise the following monomers:
35-60 parts of pentamethylene diamine;
1-30 parts of hexamethylene diamine;
0 to 25 parts, more preferably 0 to 20 parts, of terephthalic acid and/or a derivative thereof;
20 to 60 parts of isophthalic acid and/or a derivative thereof, and more preferably 30 to 55 parts;
wherein all parts are calculated as mole parts.
6. The tetrapolypolyamide PA56IT of claim 5, wherein the pentanediamine is chemically or biologically derived, preferably biologically derived; and/or the presence of a gas in the atmosphere,
the terephthalic acid derivative is one or more selected from terephthaloyl chloride, dimethyl terephthalate and diethyl terephthalate; and/or the presence of a gas in the gas,
the isophthalic acid derivative is selected from one or more of isophthalic acid dichloride, dimethyl isophthalate and diethyl isophthalate.
7. The tetrapolyamide PA56IT of claim 5, wherein the raw material of the tetrapolyamide PA56IT further comprises additives comprising end-capping agents, UV stabilizers, heat stabilizers, radical scavengers and/or processing aids, impurity inhibitors, lubricants, mold release aids, plasticizers, functional additives for influencing optical properties, in particular refractive index, impact modifiers, nanofillers and/or additives, gloss enhancers, dyes or mixtures thereof.
8. A process for the preparation of the quaternary copolyamide PA56IT according to any one of claims 1 to 7, comprising the following steps: mixing pentanediamine, hexanediamine, terephthalic acid and/or derivatives thereof and isophthalic acid and/or derivatives thereof with water according to the proportion of molar parts to prepare a polyamide salt solution; adjusting the pH value of the polyamide salt solution to make the pH value of the polyamide salt solution be more than 8.0 when the concentration of the polyamide salt solution is 10 percent, raising the temperature to make the pressure in the reaction system be 0.3-3.2 Mpa, maintaining the pressure for 30-120 min, and then releasing the pressure to normal pressure; vacuumizing the reaction system for 20-100 min, and controlling the temperature to be 230-290 ℃ after the reaction is finished to obtain a melt; and melting, discharging, drawing strips and cutting into granules to obtain the PA56IT resin.
9. The process of the tetrapolyamide PA56IT according to claim 8, wherein the ratio of the sum of the moles of terephthalic acid and/or derivatives thereof and isophthalic acid and/or derivatives thereof to the sum of the moles of pentanediamine and hexanediamine is 1:0.95 to 1.07;
preferably, the molar part ratio of the isophthalic acid and/or the derivative thereof, the terephthalic acid and/or the derivative thereof and the pentanediamine is 3-5: 0.01 to 2:4 to 5;
preferably, the mole number of the isophthalic acid and/or the derivative thereof is 60 to 100% with respect to the sum of the mole numbers of the terephthalic acid and/or the derivative thereof and the isophthalic acid and/or the derivative thereof.
10. A molded article characterized in that a raw material for the molded article comprises the quaternary copolyamide PA56IT according to any one of claims 1 to 7.
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