CN115536840A - Low-hardness long-chain nylon elastomer and preparation method thereof - Google Patents
Low-hardness long-chain nylon elastomer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a low-hardness long-chain nylon elastomer and a preparation method thereof, belonging to the technical field of polymer synthesis and preparation. The low-hardness long-chain nylon elastomer is prepared from the following raw materials in parts by weight: 60-80 parts of double-end ester-based polyether; 5-20 parts of long-chain dicarboxylic acid; 10-25 parts of long-chain diamine; 0.1-0.5 part of catalyst; 0.5-1.0 part of antioxidant; 0-20 parts of water. The elastomer has longer soft segment molecular chain, a large number of side groups and lower hard segment crystallization degree, so that microphase separation can be formed between the soft and hard segments to achieve the effect of physical crosslinking, and the prepared elastomer has high elongation at break, low processing temperature and adjustable hardness range of 20D-40D. In the polymerization process, monomers or catalysts do not need to be added, the materials are discharged by a one-pot method, the polymerization process is short, the working procedures are few, and the operation is simple and convenient.
Description
Technical Field
The invention relates to the technical field of synthesis and preparation of high polymer materials, in particular to a low-hardness long-chain nylon elastomer and a preparation method thereof.
Background
Nylon, as an engineering plastic with the largest use amount, has become a plastic variety with characteristics of multiple varieties, multiple functions, specialization, serialization and the like, and can realize the characteristics of super toughness, high strength, flame retardance, low temperature resistance, heat resistance, even rubber-like elastomers and the like. The nylon elastomer is a thermoplastic elastomer with nylon molecular chains as hard segments and polyether or polyester as soft segments. By adjusting the molecular weight of soft and hard segments, the types of monomers, the relative proportion and the block mode, a series of thermoplastic elastomers with different properties can be obtained. The nylon chain is folded and crystallized at normal temperature to form physical cross-linking points, and the crystal is broken at high temperature to release the cross-linking points, so that the thermoplastic processing can be carried out. The type of hard segment determines the final mechanical properties of the elastomer, such as strength and modulus, as well as the physical properties of melting point, hardness, density, and chemical stability. The type of soft segment determines the low temperature resistance, hydrophilicity, etc. of the elastomer.
Due to insufficient flexibility of short-chain nylon molecular chains, the prepared elastomer is hard on the whole, and is mostly used for antistatic modified materials, and high-end applications such as shoe materials, sports equipment and the like generally need elastomer materials with lower hardness. The long carbon chain nylon has long molecular carbon chain, so that the long carbon chain nylon has the properties of short chain nylon (such as nylon 6 and nylon 66), and also has the characteristics of low water absorption, high flexibility, low melting point, good low temperature resistance and the like. The dominant enterprises of nylon elastomers in the existing market are foreign brands, such as Achima, yingchuang, yu Ming and the like, the market price is higher, the hard segment of the dominant enterprises is mainly PA11 or PA12, the synthesis process is more complex, and the working procedures are more.
Patent CN104910377A discloses a preparation method of PA6 new polyamide thermoplastic elastomer, 10-45 parts of polyetheramine, 85-50 parts of caprolactam and 5 parts of ring-opening agent are reacted at 250-270 ℃ to obtain polymer, and the polymer is subjected to boiling water extraction and vacuum drying procedures to obtain the final product. The hardness of the elastomer obtained by the method is distributed between 40D and 70D, unreacted caprolactam exists in the reactant, the small molecules can be removed only by extracting in boiling water, and the process causes partial degradation of the polymer and finally has the problem of performance defect.
Patent CN108752581A discloses a nylon elastomer containing active block and its preparation method, the molecular weight of the nylon elastomer includes nylon block and active block, the active block is prepared by activating polyester polyol or polyether polyol, and then further reacts with the prepolymerized nylon block. The method needs to synthesize the soft segment and the hard segment in advance, and then the two parts are put into a reaction kettle for polymerization, so the process is long and the operation is complex.
At present, although many studies on nylon elastomers are being made, most of the nylon elastomers have high hardness, and in practical application, elastomers with low hardness and good low temperature resistance are dominant. Secondly, most elastomer polymerization processes need to be carried out in multiple steps, or hard sections need to be polymerized after salifying, so that the process is complex.
Disclosure of Invention
In order to improve the preparation simplicity of the nylon elastomer and meet the low hardness requirement of the nylon elastomer in some fields, the invention discloses a low-hardness long-chain nylon elastomer and a preparation method thereof, which realize one-step polymerization of the low-hardness long-chain nylon elastomer to obtain a nylon elastomer material with good performance, large elongation at break and low processing temperature, wherein the shore hardness range of the low-hardness mark is 20D-40D.
In order to solve the technical problems, the invention provides the following technical scheme:
on one hand, the invention provides a low-hardness long-chain nylon elastomer which is prepared from the following raw materials in parts by weight:
the structural formula of the diester-terminated polyether is as follows:
wherein R is methyl or ethyl, R 1 Is C0-C10 alkyl, R 2 Is methyl or ethyl, x is 10-40, n is 1-4.
Further, chain extension and end group modification are carried out on the amino-terminated polyether by using diethyl alkyl acid/methyl ester to obtain the diester-terminated polyether. The diester-based polyether is prepared by the following method: mixing 8-12 parts by weight of alkyl acid diester and 78-80 parts by weight of double-end amino polyether in a reaction kettle, heating to 120-160 ℃, reacting for 0.5-2 h, discharging after pressure relief, cooling and drying to obtain double-end ester-group polyether;
the alkyl diester is alkyl diethyl ester or alkyl dimethyl ester. For example, diethyl oxalate, dimethyl oxalate;
the amine-terminated polyether can be polypropylene oxide polyether amine.
Preferably, the long-chain dibasic acid is selected from C10-C13 dibasic acid, and the long-chain diamine is selected from C10-C13 diamine. For example, dodecanediamine and sebacic acid.
Preferably, the catalyst is one or more of sodium hypophosphite, phosphoric acid and pyrophosphoric acid;
the antioxidant is antioxidant 1010 and/or antioxidant 1098.
On the other hand, the invention also provides a preparation method of the low-hardness long-chain nylon elastomer, which is characterized in that a double-end ester group polyether soft segment and a long-chain nylon hard segment monomer are polymerized by a one-step method to prepare the low-hardness long-chain nylon elastomer, and the preparation method comprises the following steps:
step 1: putting the double-end ester-group polyether, long-chain dicarboxylic acid and long-chain diamine into a reaction kettle, adding water, a catalyst and an antioxidant, and replacing air in a system with nitrogen;
and 2, step: mixing and stirring for 0-2 h at 80 ℃, and then mixing and stirring for 0-2 h at 150-200 ℃;
and step 3: keeping the pressure below 1kPa and the temperature at 200-250 ℃ for reaction for 1-4 h to complete the polymerization;
and 4, step 4: and discharging, cooling in water, granulating and drying to obtain the nylon elastomer slice.
In still another aspect, the invention also provides an application of the low-hardness long-chain nylon elastomer, which is used for plastics, films or elastic fibers. The low-hardness nylon elastomer prepared by the invention has excellent toughness and low-temperature performance, and wide application potential, such as flexible injection molding parts like medical hoses, breathing (breathable) films, foaming base materials used for shoe materials, sports equipment, sofa cushions and the like, high-elastic fiber products made of skin-friendly materials and modification materials used for improving the toughness/elasticity of nylon.
The nylon elastomer prepared by the invention consists of a soft segment and a hard segment, wherein the soft segment is of a double-end ester-based polyether structure, the hard segment of the nylon elastomer is formed by combining long-chain dibasic acid and long-chain diamine, and the polymerization degree in a final product is 1-6.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention utilizes ester exchange amide reaction to protect the soft segment amino group from being damaged by high temperature, and ensures that the charge ratio is the proportion of functional groups, thereby synthesizing the nylon elastomer with high molecular weight in one pot;
2) The polyether is subjected to chain extension, so that the proportion of a soft segment in a polymer is improved, the hardness of a final product is reduced, and special requirements of partial fields are met;
3) The adopted chain extension monomer has the same chain structure as nylon, so that the final characteristics cannot be influenced;
4) The nylon elastomer prepared by the method provided by the invention almost has no terminal carboxyl, does not generate ionized acid under a long-time wet condition, and has better hydrolysis resistance.
The invention utilizes the native advantages of biological fermentation of long-chain diamine and long-chain diacid monomers, and takes the monomers as the elastomer hard segment to prepare the long nylon elastomer, and has the characteristics of wide raw material source, good low-temperature impact property, excellent processing performance and the like.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments.
In the present invention, the materials and reagents used are not specifically described, and are commercially available.
The invention provides a low-hardness long-chain nylon elastomer and a preparation method thereof, and specific examples are as follows.
Example 1
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 10 parts of diethyl oxalate and 90 parts of polypropylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end ethyl ester polyether with the following structure.
Adding 60 parts of ethyl bi-end ester polyether, 18 parts of dodecanediamine and 22 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.1 part of pyrophosphoric acid, 0.2 part of antioxidant 1010, 0.3 part of antioxidant 1098 and 10 parts of water. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. Heating to 170 ℃ within 2h, and gradually releasing small molecules such as water vapor and ethanol. Keeping the vacuum degree of the system below 1kPa, reacting for 2h at the temperature of 220 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 1.
Example 2
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 10 parts of diethyl oxalate and 90 parts of polypropylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end ethyl ester polyether with the following structure.
Adding 80 parts of ethyl bi-end ester polyether, 8 parts of dodecanediamine and 12 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.1 part of pyrophosphoric acid, 0.2 part of antioxidant 1010, 0.3 part of antioxidant 1098 and 10 parts of water. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. Heating to 170 ℃ within 2h, and gradually releasing small molecules such as water vapor and ethanol. Keeping the vacuum degree of the system below 1kPa, reacting for 2h at the temperature of 220 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 2.
Example 3
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 8 parts of diethyl oxalate and 92 parts of polypropylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end ethyl ester polyether with the following structure.
Adding 60 parts of double-end ethyl ester polyether, 19 parts of dodecane diamine and 21 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.1 part of pyrophosphoric acid, 0.5 part of compound antioxidant 1010/1098 (the mass ratio of the two is 2: 3) and 10 parts of water. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. Heating to 170 ℃ within 2h, and gradually releasing small molecules such as water vapor and ethanol. Keeping the vacuum degree of the system below 1kPa, reacting for 2h at 220 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 3.
Example 4
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 8 parts of diethyl oxalate and 92 parts of polypropylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end ethyl ester polyether with the following structure.
Adding 80 parts of double-ended ethyl ester polyether, 9 parts of dodecanediamine and 11 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.1 part of pyrophosphoric acid, 0.5 part of compound antioxidant 1010/1098 (the mass ratio of the two is 2: 3) and 10 parts of water. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. Heating to 170 ℃ within 2h, and gradually releasing small molecules such as water vapor and ethanol. Keeping the vacuum degree of the system below 1kPa, reacting for 2h at the temperature of 220 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 4.
Example 5
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 9 parts of dimethyl oxalate and 91 parts of polypropylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end methyl ester polyether with the following structure.
Adding 70 parts of double-end methyl ester polyether, 13 parts of dodecane diamine and 17 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.1 part of pyrophosphoric acid, 0.5 part of a compound antioxidant 1010/1098 (the mass ratio of the two is 2. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. The temperature is raised to 170 ℃ within 2h, and small molecules such as water vapor and methanol are gradually released. Keeping the vacuum degree of the system below 1kPa, reacting for 2h at 220 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 5.
Example 6
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
the preparation method of ethyl bi-terminal ester polyether is the same as that of example 3;
adding 80 parts of double-ended ethyl ester polyether, 5 parts of dodecanediamine and 10 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.3 part of pyrophosphoric acid, 1 part of compound antioxidant 1010/1098 (the mass ratio of the two is 1. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. Heating to 150 deg.C within 2h, and gradually releasing small molecules such as water vapor and ethanol. Keeping the vacuum degree of the system below 1kPa, reacting for 4h at the temperature of 200 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 6.
Example 7
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
the preparation method of ethyl bi-terminal ester polyether is the same as that of example 3;
adding 60 parts of double-ended ethyl ester polyether, 20 parts of dodecanediamine and 25 parts of sebacic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.3 part of pyrophosphoric acid, 0.8 part of compound antioxidant 1010/1098 (the mass ratio of the two is 1: 2) and 5 parts of water. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. Heating to 200 deg.C within 2h, and gradually releasing small molecules such as water vapor and ethanol. Keeping the vacuum degree of the system below 1kPa, reacting for 1h at the temperature of 250 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 7.
Example 8
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 9 parts of dimethyl oxalate and 91 parts of polyethylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end methyl ester polyether with the following structure.
Adding 70 parts of methyl-terminated polyether, 12 parts of decanediamine and 16 parts of dodecanedioic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.3 part of pyrophosphoric acid, 0.6 part of compound antioxidant 1010/1098 (the mass ratio of the two is 2. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. The temperature is raised to 180 ℃ within 2h, and micromolecules such as water vapor, methanol and the like are gradually released. Keeping the vacuum degree of the system below 1kPa, reacting for 1.5h at the temperature of 250 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 8.
Example 9
A preparation method of a low-hardness long-chain nylon elastomer comprises the following steps:
adding 7 parts of dimethyl oxalate and 93 parts of polypropylene oxide polyether amine into a reaction kettle, slowly heating to 150 ℃, stirring for 1h, slowly discharging gas, and stirring for 1h to obtain the double-end methyl ester polyether with the following structure.
Adding 80 parts of methyl-terminated polyether, 10 parts of decanediamine and 16 parts of dodecanedioic acid into a reaction kettle, and then adding 0.2 part of sodium hypophosphite, 0.3 part of pyrophosphoric acid, 1 part of compound antioxidant 1010/1098 (the mass ratio of the two is 1: 1) and 10 parts of water. After replacing the air in the system with nitrogen, heating to 80 ℃ and uniformly mixing all the materials. The temperature is raised to 190 ℃ within 2h, and small molecules such as water vapor and methanol are gradually released. Keeping the vacuum degree of the system below 1kPa, reacting for 2h at 240 ℃, then filling nitrogen into the system, discharging from a lower discharging port and cooling to obtain the long-chain nylon elastomer 9.
To further illustrate the beneficial effects of the present invention, a comparative example was constructed as follows, using example 3 as an example only, for reasons of space.
Comparative example 1
The same as in example 3 except that the ethyl ester-terminated polyether was replaced with an equal amount of polypropylene oxide polyetheramine was used, and the elastomer D1 was obtained.
Comparative example 2
The same conditions as in example 3 were followed except that dodecanediamine was replaced with an equal amount of 1, 6-hexanediamine, and this was designated as elastomer D2.
Comparative example 3
The same conditions as in example 3 were followed except that the sebacic acid was replaced by an equal amount of adipic acid, and the elastomer D3 was obtained.
The elastomers prepared in the examples of the present invention and the comparative examples were subjected to performance tests, specifically:
tensile property: referring to the measurement of the tensile property of the GB/T1040.1-2018 plastics, the test is carried out on 1BA type sample bars at the speed of 50mm/min, at least 5 sample bars are tested, and the results are averaged.
Hardness: according to the standard of measuring the indentation hardness (Shore hardness) by using a hardness tester according to GB/T2411-2008 plastic and hard rubber, the Shore hardness D/1s of a wafer sample with the thickness of 6mm is measured, at least five points are taken for testing, and the results are averaged.
The results of the performance tests on the long chain nylon elastomers prepared in examples 1-9 are shown in Table 1. The results of the elastomer property tests prepared in comparative examples 1 to 3 are shown in Table 2.
TABLE 1
As shown in Table 1, the long-chain nylon elastomer prepared by the invention has larger elongation at break, and the Shore hardness of the low-hardness mark of the prepared long-chain nylon elastomer is 20D-40D.
The invention utilizes ester exchange amide reaction to protect the soft segment amino group from being damaged by high temperature, and ensures that the charge ratio is the proportion of functional groups, thereby synthesizing the nylon elastomer with high molecular weight in one pot; the polyether is chain extended, so that the proportion of soft segments in the polymer is increased, and the hardness of the final product is reduced.
TABLE 2
| Numbering | Hardness D | Elongation at break% |
| Elastomer D1 | 35 | 200 |
| Elastomer D2 | 38 | 250 |
| Elastomer D3 | 40 | 250 |
As is clear from table 2, although the nylon elastomer can be obtained by replacing the ethyl ester-terminated polyether in the present invention with the same amount of polypropylene oxide polyetheramine (comparative example 1), the hardness is slightly lowered but the elongation at break is lowered by 55.5% as compared with the present invention.
Compared with elastomers prepared with different diamines (comparative example 2) and diacids (comparative example 3), the elongation at break of the present invention is significantly higher than that of the comparative example and a lower hardness product can be obtained.
In conclusion, the invention utilizes the ester exchange amide reaction to protect the soft segment amino group from being damaged by high temperature, and ensures that the charge ratio is the proportion of functional groups, thereby being capable of synthesizing the nylon elastomer with high molecular weight in one pot, and the obtained nylon elastomer has good performance, large elongation at break and low processing temperature.
The foregoing is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and are intended to be within the scope of the invention.
Claims (8)
1. The low-hardness long-chain nylon elastomer is characterized by being prepared from the following raw materials in parts by weight:
the structural formula of the diester-terminated polyether is as follows:
wherein R is methyl or ethyl, R 1 Is C0 &C10 alkyl, R 2 Is methyl or ethyl, x is 10-40, n is 1-4.
2. The low durometer long chain nylon elastomer of claim 1, wherein the bi-ester based polyether is prepared by: mixing 8-12 parts by weight of alkyl acid diester and 78-80 parts by weight of double-end amino polyether in a reaction kettle, heating to 120-160 ℃, reacting for 0.5-2 h, discharging after pressure relief, cooling and drying to obtain double-end ester-group polyether;
the alkyl diester is alkyl diethyl ester or alkyl dimethyl ester;
the double-end amino polyether is polypropylene oxide polyether amine.
3. The low-hardness long-chain nylon elastomer according to claim 2, wherein the long-chain dibasic acid is a C10-C13 dibasic acid, and the long-chain diamine is a C10-C13 diamine.
4. The low durometer long chain nylon elastomer of claim 3, wherein the long chain diacid is sebacic acid or dodecanedioic acid; the long-chain diamine is decamethylene diamine or dodecane diamine.
5. The low-hardness long-chain nylon elastomer according to claim 4, wherein the catalyst is one or more of sodium hypophosphite, phosphoric acid and pyrophosphoric acid.
6. The low-durometer long-chain nylon elastomer of claim 5, wherein the antioxidant is antioxidant 1010 and/or antioxidant 1098.
7. The method for preparing a low-durometer long-chain nylon elastomer according to any one of claims 1 to 6, comprising the steps of:
step 1: putting the double-end ester-group polyether, long-chain dicarboxylic acid and long-chain diamine into a reaction kettle, adding water, a catalyst and an antioxidant, and replacing air in a system with nitrogen;
and 2, step: mixing and stirring for 0-2 h at 80 ℃, and then mixing and stirring for 0-2 h at 150-200 ℃;
and 3, step 3: keeping the pressure below 1kPa and the temperature between 200 and 250 ℃ for 1 to 4 hours to complete the polymerization;
and 4, step 4: and discharging, cooling in water, granulating and drying to obtain the nylon elastomer slice.
8. Use of the low durometer long chain nylon elastomer of any of claims 1-6 for plastics, films or spandex.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110655646A (en) * | 2019-09-16 | 2020-01-07 | 北京化工大学 | Preparation method of long carbon chain nylon elastomer |
| CN112745498A (en) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | Preparation method of polyamide elastomer |
| CN113527668A (en) * | 2021-07-30 | 2021-10-22 | 会通新材料(上海)有限公司 | Long-chain polyamide and preparation method and application thereof |
| CN115093700A (en) * | 2022-07-04 | 2022-09-23 | 华润化学材料科技股份有限公司 | Nylon elastomer material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110655646A (en) * | 2019-09-16 | 2020-01-07 | 北京化工大学 | Preparation method of long carbon chain nylon elastomer |
| CN112745498A (en) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | Preparation method of polyamide elastomer |
| CN113527668A (en) * | 2021-07-30 | 2021-10-22 | 会通新材料(上海)有限公司 | Long-chain polyamide and preparation method and application thereof |
| CN115093700A (en) * | 2022-07-04 | 2022-09-23 | 华润化学材料科技股份有限公司 | Nylon elastomer material and preparation method thereof |
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