CN115785888A - Medical polyurethane pouring sealant and preparation method thereof - Google Patents
Medical polyurethane pouring sealant and preparation method thereof Download PDFInfo
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- CN115785888A CN115785888A CN202211649932.XA CN202211649932A CN115785888A CN 115785888 A CN115785888 A CN 115785888A CN 202211649932 A CN202211649932 A CN 202211649932A CN 115785888 A CN115785888 A CN 115785888A
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- pouring sealant
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- polyurethane pouring
- medical polyurethane
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 29
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 29
- 239000000565 sealant Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000013461 design Methods 0.000 claims abstract description 3
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 3
- 229920005862 polyol Polymers 0.000 claims description 9
- 150000003077 polyols Chemical class 0.000 claims description 9
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 8
- 239000004970 Chain extender Substances 0.000 claims description 6
- 239000012024 dehydrating agents Substances 0.000 claims description 6
- 125000005442 diisocyanate group Chemical group 0.000 claims description 6
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- NSOXQYCFHDMMGV-UHFFFAOYSA-N Tetrakis(2-hydroxypropyl)ethylenediamine Chemical compound CC(O)CN(CC(C)O)CCN(CC(C)O)CC(C)O NSOXQYCFHDMMGV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004382 potting Methods 0.000 claims description 4
- 150000003384 small molecules Chemical group 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004359 castor oil Substances 0.000 claims description 3
- 235000019438 castor oil Nutrition 0.000 claims description 3
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 3
- 229920001228 polyisocyanate Polymers 0.000 claims description 3
- 239000005056 polyisocyanate Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- ALQLPWJFHRMHIU-UHFFFAOYSA-N 1,4-diisocyanatobenzene Chemical compound O=C=NC1=CC=C(N=C=O)C=C1 ALQLPWJFHRMHIU-UHFFFAOYSA-N 0.000 claims description 2
- CYMHAQCMKNVHPA-UHFFFAOYSA-N 3-butyl-2-heptan-3-yl-1,3-oxazolidine Chemical compound CCCCC(CC)C1OCCN1CCCC CYMHAQCMKNVHPA-UHFFFAOYSA-N 0.000 claims description 2
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical compound C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 claims description 2
- 125000005263 alkylenediamine group Chemical group 0.000 claims description 2
- LHIJANUOQQMGNT-UHFFFAOYSA-N aminoethylethanolamine Chemical compound NCCNCCO LHIJANUOQQMGNT-UHFFFAOYSA-N 0.000 claims description 2
- 150000004984 aromatic diamines Chemical class 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 229920005906 polyester polyol Polymers 0.000 claims description 2
- 150000003512 tertiary amines Chemical class 0.000 claims description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 2
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims 1
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000000502 dialysis Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000010074 rubber mixing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000023555 blood coagulation Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a medical polyurethane pouring sealant and a preparation method thereof, wherein the preparation method comprises the following steps: s1, uniformly mixing A1, A2 and A3 in proportion, stirring under a certain condition, introducing nitrogen for 3 times, then cooling to 80 ℃ and keeping the temperature, adding A4, a catalyst and a water removing agent under the nitrogen, and continuously stirring for 1 hour in vacuum to obtain a component A; s2, heating the B2 to 105 ℃ in proportion, dehydrating for 2h in vacuum, cooling, adding the dehydrated B2 into the B1 in a stirring state in proportion, and slowly heating for reaction; measuring the NCO mass fraction of the prepolymer, completing the synthesis of the prepolymer after the analysis value is basically consistent with the design value, and sealing and storing the prepolymer after defoaming for later use; s3, uniformly mixing the components in proportion of A, B to obtain the polyurethane pouring sealant. The medical polyurethane pouring sealant disclosed by the invention meets the biomedical requirements, and simultaneously has the advantages of low viscosity, moderate operation time and moderate hardness.
Description
Technical Field
The invention relates to the field of biomedical polymers, in particular to a medical polyurethane pouring sealant and a preparation method thereof.
Background
The hemodialyzer comprises an outer shell and a dialysis membrane, wherein two ends of the dialysis membrane are fixed in two ends of the shell through resin glue, so that the dialysis membrane is uniformly distributed in the shell. The key for ensuring the qualification of the performance of the hemodialyzer is that the bonding sealing performance of the adhesive is important besides the qualification of the outer shell and the dialysis membrane.
Conventionally, potting refers to an operation process performed by reasonably arranging, assembling, connecting, sealing, protecting and the like the devices of each part constituting the device according to the specified requirements by means of potting materials, so as to prevent the intrusion of moisture, dust and harmful gases to the devices, slow down vibration, prevent external force damage and stabilize the functions of the devices. The polyurethane pouring sealant has the characteristics of strong environment adaptability, good shock absorption performance and cold and hot cycle resistance, excellent wear resistance and rebound resilience, and particularly has wide application in the field of pouring and sealing due to the characteristic that the technical index can be regulated and controlled by a formula.
The main application scene of the pouring sealant at present is the pouring sealant of electronic devices, but the application amount of the pouring sealant in medical instruments is relatively small, for example, the pouring sealant of a hemodialyzer, so that the attention on the development of specific requirements in the field is lacked, and the literature data and research reports in the field are rarely seen. Particularly, the encapsulation of the hemodialyzer requires that the viscosity is not too high, so that the hemodialyzer can conveniently flow and mix in a rubber mixing tube and quickly infiltrate into the gaps of tows at the part to be sealed of the hemodialyzer; proper operation time can cause a series of problems when the operation time is too long or too short, the pouring sealant can not completely fill the gaps of the whole tows when the operation time is too fast, penetrating air holes can be caused, the product can fail, and the problem that the product is poor in appearance and even damaged in function because the glue still has certain fluidity after the pouring is too slow can cause local material shortage; the appropriate hardness cannot be too low to meet the requirements of cutting and trimming the surface of the polyurethane encapsulation position in the head cutting process, and cannot be too high to meet the requirement of carrying out micro deformation on polyurethane in the end cover fixing process. However, most polyurethane pouring sealants have difficulty in satisfying the above requirements at the same time, or have low viscosity, long operation time, and low hardness; or high viscosity, short operation time and high hardness.
Disclosure of Invention
The invention aims to provide a medical polyurethane pouring sealant and a preparation method thereof, and aims to solve the problem that the viscosity, the operation time and the hardness in the prior art cannot be considered at the same time.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a medical polyurethane pouring sealant and a preparation method thereof, wherein the medical polyurethane pouring sealant comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
the polyether polyol A2 has the functionality of 2-3, the hydroxyl value of 30-180mg (KOH)/g and the viscosity of 100-800mPa & s; a3 is an alkoxylated alkylenediamine having an OH number of from 350 to 950mg KOH/g, selected from N, N, N ', N (2-hydroxyethyl) ethylenediamine and N, N, N ', N ' -tetrakis (2-hydroxypropyl) ethylenediamine, in particular N, N, N ', N ' -tetrakis (2-hydroxypropyl) ethylenediamine.
Further, the small molecule chain extender A4 comprises 1,4-butanediol and aromatic diamine 3,3 '-dichloro-4,4' -diaminodiphenylmethane; the catalyst 1 is organic bismuth and tertiary amine substances, and the catalyst 2 is organic zinc; the water removing agent is BF-5 dehydrating agent, TI water removing agent or 3-butyl-2- (1-ethyl amyl) oxazolidine.
Further, the small molecule chain extender A4 is preferably 1,4-butanediol; the catalyst 1 is preferably an organobismuth; the dehydrating agent is preferably a BF-5 dehydrating agent.
Further, the component B comprises the following components in parts by weight: 80-100 parts of polyisocyanate B1 and 0-20 parts of polyol B2, wherein the content of isocyanate in the component B is preferably 20-25wt%.
Further, B1 is one or more of monomer diisocyanate, triisocyanate, oligomer, polymer and derivative of monomer diisocyanate or triisocyanate.
Further, the B2 is polyether polyol or polyester polyol, the functionality of the polyol is preferably 2, and the average molecular weight of the polyol is preferably 300-1000.
Further, said B1 also comprises aromatic monomeric diisocyanates or triisocyanates, in particular one or more of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, one or more of 4,4' -, 2,4' -and 2,2' -diphenylmethane diisocyanate, a mixture of MDI and MDI homologues, 1,3-and 1,4-benzene diisocyanate.
Further, said B1 is preferably an MDI derivative.
Further, the preparation method of the medical polyurethane pouring sealant comprises the following steps:
s1, preparation of a component A: uniformly mixing A1, A2 and A3 in proportion, stirring for 2h under the condition of vacuum of 90-120 ℃, introducing nitrogen for 3 times each time for 2-3 minutes, then cooling to 80 ℃, keeping the temperature, adding A4, a catalyst and a water removing agent under the nitrogen, and continuously stirring for 1h under vacuum to obtain a component A;
s2, preparation of a component B: heating B2 to 105 ℃ according to a proportion, dehydrating for 2h under vacuum, cooling to 40-50 ℃, adding the dehydrated B2 into B1 under a stirring state according to a proportion, and slowly heating to 75 ℃ for reaction for 2h; measuring the NCO mass fraction of the prepolymer, indicating that the synthesis of the prepolymer is finished after the analysis value is basically consistent with the design value, and sealing and storing the prepolymer after defoaming for later use;
s3, mixing the component A and the component B according to the proportion of 1: and (1.53-1.63) are uniformly mixed according to the mass ratio to obtain the polyurethane pouring sealant.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) The medical polyurethane pouring sealant provided by the invention has good mechanical properties and biological properties, for example, by using a bio-friendly low-toxicity catalyst, the problems of precipitation of toxic substances, allergy, blood coagulation and the like causing pain to patients are solved, and the castor oil is used as the main body of the adhesive A, so that the adhesive has good biocompatibility.
(2) The operation time and the viscosity are appropriate, and the viscosity of A is close to that of B, so that the flowing mixing in the rubber mixing pipe is convenient, and the fiber bundle gaps at the part to be sealed of the dialyzer can be quickly infiltrated.
(3) The hardness can reach about 80 within about 4h through formula adjustment, and the production efficiency is greatly improved.
Detailed Description
Embodiments of the present invention are described in further detail below by way of examples, but the embodiments of the present invention are not limited thereto.
The A1 castor oil has high functionality and polar groups, is convenient for a pouring sealant product to form a cross-linked structure, is favorable for improving the hardness and generating more obvious microphase separation, and has hydrophilic polar groups which are favorable for improving the biocompatibility and reducing the coagulation probability.
The functionality of A3 is 4, the crosslinking degree of the system can be obviously improved when the A3 is added into the system, the hardness of the system is obviously improved, and particularly, relatively short open time can be obtained to prevent the material from deforming in the curing process under the action of gravitational energy.
The A4 micromolecule chain extender is mainly used as a spacer between adjacent polyisocyanates, promotes polyurethane to form a microphase separation structure, and improves physical and mechanical properties.
The catalyst mainly promotes NCO/OH reaction, avoids NCO side reaction and reduces CO 2 Generating bubbles during preparation; the catalyst is used compositely, the organobismuth provides the gel speed required by curing, polyurethane is generated at high selectivity and high rate, and the zinc accelerates the post reaction stage to promote crosslinking.
The water remover is used for removing residual trace water in a system, eliminating bubbles and pinholes in the reaction process, reducing gloss loss and haze, improving wear resistance and chemical resistance, improving adhesion, eliminating foaming phenomenon and improving operation performance. BF-5 is preferably selected as a water removal agent, the prepared product has good appearance transparency and glossiness and no peculiar smell, and no additional toxic component is introduced into the system.
The component B is a commercial product, namely Xikabisin DH41.
Preparation of component A
Uniformly mixing A1, A2 and A3 in proportion, stirring for 2h under the condition of vacuum of 90-120 ℃, introducing nitrogen for 3 times each time for 2-3 minutes, then cooling to 80 ℃, keeping the temperature, adding A4, a catalyst and a water removing agent under the nitrogen, and continuously stirring for 1h under vacuum to obtain a component A;
formulation ratios are shown in the following table
The A, B components of examples 1-5 were mixed to obtain a medical polyurethane potting adhesive for performance testing, and the test results are shown in the following table:
Claims (9)
1. the medical polyurethane pouring sealant is characterized by comprising a component A and a component B, wherein the component A comprises the following components in parts by weight:
60-90 parts of castor oil A
10-40 parts of polyether polyol A2
A3 0.5 to 4 portions of
0.5-4 parts of micromolecular chain extender A
Catalyst 1.1-1 part
Catalyst 2.01-0.5 part
0.1 to 2 portions of water removal agent
The polyether polyol A2 has the functionality of 2-3, the hydroxyl value of 30-180mg (KOH)/g and the viscosity of 100-800mPa & s; a3 is an alkoxylated alkylenediamine having an OH number of from 350 to 950mg KOH/g, selected from N, N, N ', N (2-hydroxyethyl) ethylenediamine and N, N, N ', N ' -tetrakis (2-hydroxypropyl) ethylenediamine, in particular N, N, N ', N ' -tetrakis (2-hydroxypropyl) ethylenediamine.
2. The medical polyurethane pouring sealant as claimed in claim 1, wherein the small-molecule chain extender A4 comprises 1, 4-butanediol and aromatic diamine 3,3 '-dichloro-4, 4' -diaminodiphenylmethane; the catalyst 1 is organic bismuth and tertiary amine substances, and the catalyst 2 is organic zinc; the water removing agent is BF-5 dehydrating agent, TI water removing agent or 3-butyl-2- (1-ethyl amyl) oxazolidine.
3. The medical polyurethane pouring sealant as claimed in claim 2, wherein the small-molecule chain extender A4 is preferably 1, 4-butanediol; the catalyst 1 is preferably an organobismuth; the dehydrating agent is preferably a BF-5 dehydrating agent.
4. The medical polyurethane pouring sealant as claimed in claim 1, wherein the component B comprises the following components in parts by weight: 80-100 parts of polyisocyanate B1 and 0-20 parts of polyol B2, wherein the content of the isocyanate group in the component B is preferably 20-25wt%.
5. The medical polyurethane pouring sealant as claimed in claim 4, wherein B1 is one or more of monomeric diisocyanate, triisocyanate, oligomers, polymers and derivatives of monomeric diisocyanate or triisocyanate.
6. The medical polyurethane pouring sealant as claimed in claim 4, wherein B2 is polyether polyol or polyester polyol, and has a functionality of preferably 2 and an average molecular weight of preferably 300-1000.
7. The medical polyurethane potting compound of claim 5, wherein B1 further comprises aromatic monomeric diisocyanates or triisocyanates, in particular one or more of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, 4,4' -, 2,4' -and 2,2' -diphenylmethane diisocyanate, a mixture of MDI and MDI-homologues, 1,3-and 1,4-benzene diisocyanate.
8. The medical polyurethane pouring sealant as claimed in claim 7, wherein B1 is preferably MDI derivative.
9. The preparation method of the medical polyurethane pouring sealant according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, preparation of a component A: uniformly mixing A1, A2 and A3 in proportion, stirring for 2 hours at the vacuum condition of 90-120 ℃, introducing nitrogen for 3 times, each time for 2-3 minutes, then cooling to 80 ℃, keeping at the temperature, adding A4, a catalyst and a water removing agent under the nitrogen, and continuously stirring for 1 hour in vacuum to obtain a component A;
s2, preparation of a component B: heating B2 to 105 ℃ according to a proportion, dehydrating for 2h under vacuum, cooling to 40-50 ℃, adding the dehydrated B2 into B1 under a stirring state according to a proportion, and slowly heating to 75 ℃ for reaction for 2h; measuring the NCO mass fraction of the prepolymer, indicating that the synthesis of the prepolymer is finished when the analysis value basically accords with the design value, and sealing and storing the prepolymer for later use after defoaming;
s3, mixing the component A and the component B according to the proportion of 1: and (1.53-1.63) are uniformly mixed according to the mass ratio to obtain the polyurethane pouring sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211649932.XA CN115785888A (en) | 2022-12-21 | 2022-12-21 | Medical polyurethane pouring sealant and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211649932.XA CN115785888A (en) | 2022-12-21 | 2022-12-21 | Medical polyurethane pouring sealant and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115785888A true CN115785888A (en) | 2023-03-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211649932.XA Pending CN115785888A (en) | 2022-12-21 | 2022-12-21 | Medical polyurethane pouring sealant and preparation method thereof |
Country Status (1)
| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083229A (en) * | 2017-05-12 | 2017-08-22 | 南京威邦新材料有限公司 | A kind of preparation method of membrane for water treatment bi-component polyurethane pouring sealant |
| CN110621713A (en) * | 2017-05-05 | 2019-12-27 | 巴斯夫欧洲公司 | Storage-stable polyurethane encapsulation compounds for hollow fibers embedded in filter element preparation |
-
2022
- 2022-12-21 CN CN202211649932.XA patent/CN115785888A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110621713A (en) * | 2017-05-05 | 2019-12-27 | 巴斯夫欧洲公司 | Storage-stable polyurethane encapsulation compounds for hollow fibers embedded in filter element preparation |
| CN107083229A (en) * | 2017-05-12 | 2017-08-22 | 南京威邦新材料有限公司 | A kind of preparation method of membrane for water treatment bi-component polyurethane pouring sealant |
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