CN115894898A - Quaternary copolymerized polyamide PA56IT and preparation method thereof - Google Patents

Quaternary copolymerized polyamide PA56IT and preparation method thereof Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
pa56it
gas
parts
quaternary
copolyamide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110894844.5A
Other languages
Chinese (zh)
Inventor
秦兵兵
李金璇
刘修才
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cathay Wusu Biomaterial Co ltd
Cathay R&D Center Co Ltd
CIBT America Inc
Original Assignee
Cathay Wusu Biomaterial Co ltd
Cathay R&D Center Co Ltd
CIBT America Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cathay Wusu Biomaterial Co ltd, Cathay R&D Center Co Ltd, CIBT America Inc filed Critical Cathay Wusu Biomaterial Co ltd
Priority to CN202110894844.5A priority Critical patent/CN115894898A/en
Publication of CN115894898A publication Critical patent/CN115894898A/en
Pending legal-status Critical Current

Links

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

Quaternary copolymerized polyamide PA56IT and preparation method thereof
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):
Figure BDA0003197475040000021
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
Figure BDA0003197475040000111
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):
Figure FDA0003197475030000011
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.
CN202110894844.5A 2021-08-05 2021-08-05 Quaternary copolymerized polyamide PA56IT and preparation method thereof Pending CN115894898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110894844.5A CN115894898A (en) 2021-08-05 2021-08-05 Quaternary copolymerized polyamide PA56IT and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110894844.5A CN115894898A (en) 2021-08-05 2021-08-05 Quaternary copolymerized polyamide PA56IT and preparation method thereof

Publications (1)

Publication Number Publication Date
CN115894898A true CN115894898A (en) 2023-04-04

Family

ID=86491997

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110894844.5A Pending CN115894898A (en) 2021-08-05 2021-08-05 Quaternary copolymerized polyamide PA56IT and preparation method thereof

Country Status (1)

Country Link
CN (1) CN115894898A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012031403A (en) * 2010-07-08 2012-02-16 Mitsubishi Gas Chemical Co Inc Polyamide resin composition
US20180171074A1 (en) * 2016-12-16 2018-06-21 Ems-Patent Ag Transparent polyamide moulding compositions with high tensile strain at break
CN111378120A (en) * 2018-12-27 2020-07-07 江苏瑞美福新材料有限公司 Heat-resistant polyamide material and preparation method thereof
CN113121817A (en) * 2019-12-30 2021-07-16 上海凯赛生物技术股份有限公司 Polyamide copolymer 56TI with low water absorption rate, and preparation method and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012031403A (en) * 2010-07-08 2012-02-16 Mitsubishi Gas Chemical Co Inc Polyamide resin composition
US20180171074A1 (en) * 2016-12-16 2018-06-21 Ems-Patent Ag Transparent polyamide moulding compositions with high tensile strain at break
CN111378120A (en) * 2018-12-27 2020-07-07 江苏瑞美福新材料有限公司 Heat-resistant polyamide material and preparation method thereof
CN113121817A (en) * 2019-12-30 2021-07-16 上海凯赛生物技术股份有限公司 Polyamide copolymer 56TI with low water absorption rate, and preparation method and application thereof

Similar Documents

Publication Publication Date Title
EP3336131B1 (en) Transparent polyamide moulding compositions having high elongation
JP4015370B2 (en) Colorless, highly transparent polyamide blend with improved stress crack resistance
JP2834377B2 (en) Transparent polyamide composition with excellent chemical resistance
CN113121817B (en) Polyamide copolymer 56TI with low water absorption rate, and preparation method and application thereof
JPS63170418A (en) Transparent copolyamide and mixture thereof
CN112029090A (en) High-temperature-resistant low-water-absorption polyamide copolymer 5XT and preparation method thereof
JP2006504833A (en) Polyamide molding material, molded product that can be produced therefrom, and use thereof
CN113214472B (en) Low-water-absorption high-toughness polyamide copolymer 513TI and preparation method thereof
CN111471297B (en) Preparation method and application of bio-based transparent polyamide
CN107513163B (en) Preparation method of high-transparency high-toughness nylon 66 resin
CN111303407B (en) Transparent polyamide and process for producing the same
CN115894898A (en) Quaternary copolymerized polyamide PA56IT and preparation method thereof
CN115894899A (en) Polyamide copolymer PA5IT and preparation method thereof
CN115894900A (en) Polyamide copolymer PA6IT and preparation method thereof
WO2018060271A1 (en) Polymer composition, molded part and processes for production thereof
CN115725071B (en) Bio-based transparent polyamide and preparation method thereof
CN114163631B (en) Polyamide and preparation method and application thereof
CN110857331B (en) Copolymer containing polyamide 56 and preparation method thereof
JP2017165935A (en) Transparent polyamide composition, molded body and method for producing the same
CN114835894B (en) Transparent polyamide, composition containing same and preparation method thereof
CN115725069A (en) Bio-based transparent polyamide and preparation method thereof
CN107345065B (en) Polyamide resin composition and method for improving chemical resistance
JP6837007B2 (en) Polyamide resin, polyamide resin composition containing the same, method for producing the same, and molded product containing the same.
CN112759760B (en) High-low temperature aging resistant toughened polyamide 5X resin and preparation method thereof
CN113461934A (en) High-melting-point transparent nylon material and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination