CN108948304B - Preparation method and application of hyperbranched polyurethane - Google Patents
Preparation method and application of hyperbranched polyurethane Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
- C08G18/6677—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
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Abstract
The invention discloses a preparation method and application of hyperbranched polyurethane. The method comprises the steps of reacting a solution of polyol A dissolved by a solvent with isocyanate under a certain condition, then quickly dripping a solvent solution of polyol B into the reaction product, reacting for a certain time, then carrying out chain extension reaction by using the isocyanate, and finally carrying out end capping reaction by using polyol C to finally obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups. The product is a novel boron adsorption material with a hyperbranched framework and a large number of end-ortho hydroxyl groups, has strong selective adsorption on boron, has excellent mechanical strength, oxidation stability, flexibility, rebound resilience, oil resistance and solvent resistance, especially excellent water resistance, and can be repeatedly utilized in the process of extracting boron from salt lake brine, industrial wastewater, seawater and the like.
Description
Technical Field
The invention relates to the technical field of boron adsorbent preparation, in particular to a preparation method and application of hyperbranched polyurethane.
Background
Boron is widely used in the fields of industry, agriculture, national defense, biology, medicine and the like due to the special physicochemical property of boron between metal and nonmetal. China is rich in boron resources, and the boron reserves are proved to occupy the fourth part of the world and are mainly distributed in Liaoning, Qinghai, Tibet and other areas. The Liaoning area exists in the form of boron-magnesium ore, and the reserves are sharply reduced after several decades of mining; most of western boron mineral resources are stored in the form of liquid mineral, mainly exist in salt lake brine (hanjing wei, a new process research on extracting boron from salt lake brine after lithium extraction [ D ]. institute of graduate institute of chinese academy of sciences (Qinghai salt lake institute), 2007.), and are not effectively developed and utilized at present, so that further development and research are needed for the method for extracting boron from salt lake brine.
At present, the method for extracting boron from salt lake brine mainly comprises the following steps: acidification, extraction, precipitation, fractional crystallization, adsorption, etc. (Zhang jin, part of the experimental study on the extraction of boron from concentrated brine in salt lake [ D ]. institute of academy of China (Qinghai salt lake institute), 2005.). The adsorption method is characterized in that selective adsorption of the adsorbent to boron is utilized to enrich boron from brine, the action mechanism of the adsorption method mainly comprises hydrogen bond action, electrostatic attraction, hydrophobic interaction and chelation, most of boron adsorbents mainly utilize the chelation of functional groups and boron, and the adsorption method has the advantages of high boron extraction efficiency, simple process and equipment, capability of recycling the adsorbents and the like (Xiyu, synthesis of adsorption resin containing o-dihydroxy functional groups and adsorption performance research on boric acid [ D ]. Hunan university, 2013 ].
According to the type of the adsorbent, it can be classified into inorganic adsorbent and organic adsorbent. The inorganic adsorbent comprises inorganic metal oxides or inorganic metal hydroxides such as magnesium oxide or magnesium hydroxide, and the like, but the substances are greatly interfered by other ions in the brine and have adverse effect on extracting boron; the organic adsorbent comprises specific meglumine adsorption resin, composite adsorption resin and other polyhydroxy organic adsorbents, and mainly utilizes chelation of hydroxyl functional groups on molecules or molecular chains to boron to extract boron.
Polyurethane is a polymer containing a plurality of-NCO repeating groups, has high mechanical strength, oxidation stability, flexibility, rebound resilience, oil resistance, solvent resistance, water resistance, fire resistance and other excellent performances, and is widely applied to the fields of glue, medical treatment, biological materials and the like (Zhang Zhengjiang, Congli, Jinjuan. preparation of polyurethane foam adsorbent and application thereof in enrichment/separation of metal ions [ J ] material guidance, 2017,31(05):34-39 ]. Hyperbranched polyurethane is a polyurethane resin having a special shape, has a highly branched and three-dimensional spherical structure, is difficult to crystallize, has no twisted chain, has more terminal functional groups, and is easy to synthesize, compared with linear, branched, and crosslinked polyurethanes, and thus, in recent years, hyperbranched polyurethanes are widely used in various industries. However, no scholars have studied the polyurethane material for boron adsorption at present, and if the polyurethane material can be developed and studied by combining the excellent performance, the application prospect is very wide.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a preparation method and application of hyperbranched polyurethane, which can be used for quickly preparing hyperbranched polyurethane and realizing quick and low-cost extraction of boron from salt lake brine or seawater.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a preparation method of hyperbranched polyurethane is characterized by comprising the following steps:
(1) adding a solution of 4.6-9.1 parts of polyol A dissolved by 15-30 parts of solvent and 25.2-78.6 parts of isocyanate into a three-neck flask with a stirrer, controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 500r/min, and stirring for reaction for 2-4h to obtain a first-generation product;
(2) quickly dripping a solution of 9.3-240 parts of polyol B dissolved by 20-240 parts of solvent into the first generation product prepared in the step (1), controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 150-500r/min, and stirring for reaction for 2-4h to obtain a second generation product;
(3) dripping 25.2-235.8 parts of isocyanate into the second generation product prepared in the step (2), controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 150-500r/min, and stirring for reaction for 2-4h to obtain a third generation product;
(4) and (3) quickly dripping a solution of 13.8-175.5 parts of polyol C dissolved by 30-300 parts of solvent into the third-generation product prepared in the step (3), controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 150-500r/min, and stirring for reaction for 2-4h to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
Further, the solvent is N, N-Dimethylformamide (DMF).
Further, the polyalcohol A is one or more of pentaerythritol, glycerol, trimethylolpropane, xylitol, sorbitol, glucose or fructose.
Further, the isocyanate is one or more of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), 4-dicyclohexylmethane diisocyanate (HMDI) or Hexamethylene Diisocyanate (HDI).
Further, the polyalcohol B is one or more of pentaerythritol, glycerol, trimethylolpropane, ethylene glycol, propylene glycol, butanediol, dipropylene glycol, polyethylene glycol-100, polyethylene glycol-200, polyethylene glycol-400, polyethylene glycol-600 or polyethylene glycol-800.
Further, the polyalcohol C is one or more of glycerol, sorbitol, meglumine, glucose or fructose.
Note: the reaction of the step (2) and the step (3) can be properly repeated for 1-2 times according to the types of the selected polyol A and the polyol B, and the adding amount of the subsequent substances is increased according to the proportion of the residual hydroxyl or isocyanate groups in the reactants.
The application of the hyperbranched polyurethane is characterized in that the hyperbranched polyurethane prepared by the method is applied to extracting boron from salt lake brine, industrial wastewater or seawater.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, polyol with polyhydroxy and isocyanate are subjected to chain extension reaction step by step to obtain a hyperbranched framework, and finally, a substance with ortho-position hydroxyl is used for end capping, so that the prepared product with the hyperbranched framework has a large amount of ortho-position hydroxyl and has a very obvious effect on boron chelate adsorption;
(2) compared with the currently prepared boron adsorption organic membrane material, the boron adsorbent prepared by the invention has excellent mechanical strength, oxidation stability, flexibility, rebound resilience, oil resistance and solvent resistance, especially excellent water resistance, and can be repeatedly utilized in the process of extracting boron from salt lake brine, industrial wastewater, seawater and the like.
Detailed Description
The present invention is described in detail below with reference to examples, which are provided for further illustration of the present invention and are not to be construed as limiting the scope of the present invention.
Example one
(1) Adding a solution of 6.8 parts of pentaerythritol dissolved by 15 parts of DMF and 33.6 parts of HDI into a three-necked flask with a stirrer, controlling the temperature to be 70 ℃ under the condition of stirring speed of 150r/min, and stirring for reaction for 4 hours to obtain a first-generation product;
(2) quickly dripping a solution of 27.1 parts of pentaerythritol dissolved in 30 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 75 ℃ under the condition of stirring speed of 150r/min, and stirring for reaction for 4 hours to obtain a second-generation product;
(3) dripping 100.8 parts of HDI into the second-generation product prepared in the step (2), controlling the temperature to be 70 ℃ under the condition of stirring speed of 200r/min, and stirring for reacting for 4 hours to obtain a third-generation product;
(4) and (3) quickly dropwise adding a solution of 55.2 parts of glycerol dissolved in 30 parts of DMF into the third-generation product prepared in the step (3), and stirring and reacting for 4 hours under the condition that the stirring speed is 150r/min and the temperature is controlled to be 70 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
Example two
(1) Adding a solution of 4.8 parts of glycerol dissolved by 10 parts of DMF and 26.1 parts of TDI into a three-necked flask with a stirrer, controlling the temperature to be 75 ℃ under the condition of stirring speed of 200r/min, and stirring for reaction for 3.5 hours to obtain a first-generation product;
(2) quickly dripping a solution of 20.4 parts of pentaerythritol dissolved in 20 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 80 ℃ under the condition of stirring speed of 150r/min, and stirring for reaction for 3 hours to obtain a second-generation product;
(3) dropwise adding 75.6 parts of HDI into the second-generation product prepared in the step (2), controlling the temperature to be 75 ℃ under the condition that the stirring speed is 150r/min, and stirring for reacting for 3.5 hours to obtain a third-generation product;
(4) and (3) quickly dripping a solution of 87.75 parts of meglumine dissolved in 100 parts of DMF into the third-generation product prepared in the step (3), and stirring for reaction for 3 hours under the condition that the stirring speed is 300r/min and the temperature is controlled to be 80 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
EXAMPLE III
(1) Adding a solution of 9.1 parts of sorbitol dissolved in 30 parts of DMF and 78.6 parts of HMDI into a three-necked flask with a stirrer, and stirring and reacting for 3 hours at 80 ℃ under the condition that the stirring speed is 500r/min to obtain a first-generation product;
(2) quickly dripping a solution of 240 parts of polyethylene glycol-800 dissolved in 240 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 85 ℃ under the condition of stirring speed of 400r/min, and stirring for reaction for 3 hours to obtain a second-generation product;
(3) dripping 66.6 parts of IPDI into the second generation product prepared in the step (2), controlling the temperature to be 85 ℃ under the condition of stirring speed of 500r/min, and stirring for reacting for 2 hours to obtain a third generation product;
(4) and (3) quickly dropwise adding a solution in which 45.6 parts of xylitol is dissolved by 280 parts of DMF into the third-generation product prepared in the step (3), and stirring for reaction for 3 hours under the condition that the stirring speed is 350r/min and the temperature is controlled to be 85 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
Example four
(1) Adding a solution of 4.6 parts of glycerol dissolved by 10 parts of DMF and 25.2 parts of HDI into a three-necked bottle with a stirrer, controlling the temperature to be 90 ℃ under the condition of stirring speed of 150r/min, and stirring for reaction for 2 hours to obtain a first-generation product;
(2) quickly dripping a solution of 20 parts of DMF (dimethyl formamide) dissolved with 9.3 parts of ethylene glycol into the first-generation product prepared in the step (1), controlling the temperature to be 90 ℃ under the condition of stirring speed of 200r/min, and stirring for reaction for 2 hours to obtain a second-generation product;
(3) dripping 25.2 parts of HDI into the second-generation product prepared in the step (2), controlling the temperature to be 90 ℃ under the condition that the stirring speed is 300r/min, and stirring for reacting for 2 hours to obtain a third-generation product;
(4) and (3) quickly dropwise adding a solution of 13.8 parts of glycerol dissolved in 30 parts of DMF into the third-generation product prepared in the step (3), and stirring and reacting for 2 hours under the condition that the stirring speed is 300r/min and the temperature is controlled to be 90 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
EXAMPLE five
(1) Adding a solution of 9.1 parts of sorbitol dissolved in 30 parts of DMF and 78.6 parts of HMDI into a three-necked flask with a stirrer, and stirring and reacting for 4 hours under the condition that the stirring speed is 200r/min and the temperature is controlled to be 75 ℃ to obtain a first-generation product;
(2) quickly dripping a solution of 122.4 parts of pentaerythritol dissolved in 200 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 75 ℃ under the condition of stirring speed of 300r/min, and stirring for reaction for 3.5 hours to obtain a second-generation product;
(3) dripping 235.8 parts of HMDI into the second generation product prepared in the step (2), controlling the temperature to be 75 ℃ under the condition of stirring speed of 300r/min, and stirring for reacting for 3 hours to obtain a third generation product;
(4) and (3) quickly dripping a solution of 175.5 parts of meglumine dissolved in 300 parts of DMF into the third-generation product prepared in the step (3), and stirring and reacting for 3 hours under the condition that the stirring speed is 500r/min and the temperature is controlled to be 70 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
EXAMPLE six
(1) Adding a solution prepared by dissolving 9 parts of glucose in 20 parts of DMF and 62.5 parts of MDI into a three-necked flask with a stirrer, and stirring for reaction for 2 hours under the condition that the stirring speed is 400r/min and the temperature is controlled to be 85 ℃ to obtain a first-generation product;
(2) quickly dripping a solution of 50 parts of polyethylene glycol-200 dissolved in 100 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 70 ℃ under the condition of stirring speed of 500r/min, and stirring for reaction for 3.5 hours to obtain a second-generation product;
(3) dripping 43.5 parts of TDI into the second generation product prepared in the step (2), controlling the temperature to be 75 ℃ under the condition of stirring speed of 400r/min, and stirring for reacting for 2.5 hours to obtain a third generation product;
(4) and (3) quickly dropwise adding a solution of dissolving 45 parts of fructose by 120 parts of DMF into the third-generation product prepared in the step (3), and stirring and reacting for 2.5 hours under the condition that the stirring speed is 400r/min and the temperature is controlled to be 80 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
EXAMPLE seven
(1) Adding a solution prepared by dissolving 6.7 parts of trimethylolpropane in 20 parts of DMF and 33.3 parts of IPDI into a three-necked flask with a stirrer, controlling the temperature to be 90 ℃ under the condition of stirring speed of 300r/min, and stirring for reaction for 2 hours to obtain a first-generation product;
(2) quickly dripping a solution of 11.4 parts of propylene glycol dissolved in 20 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 90 ℃ under the condition of stirring speed of 300r/min, and stirring for reaction for 2 hours to obtain a second-generation product;
(3) dripping 21.6 parts of TDI into the second generation product prepared in the step (2), controlling the temperature to be 85 ℃ under the condition that the stirring speed is 350r/min, and stirring for reacting for 3.5 hours to obtain a third generation product;
(4) quickly dripping a solution of 20.4 parts of pentaerythritol dissolved in 150 parts of DMF into the third-generation product prepared in the step (3), controlling the temperature to be 85 ℃ under the condition of stirring speed of 350r/min, and stirring for reaction for 3 hours to obtain a fourth-generation product;
(5) dropwise adding 75.6 parts of HDI into the fourth-generation product prepared in the step (4), controlling the temperature to be 80 ℃ under the condition that the stirring speed is 400r/min, and stirring for reacting for 3 hours to obtain a fifth-generation product;
(6) and (3) quickly dropwise adding a solution of 68.4 parts of xylitol dissolved in 240 parts of DMF into the fifth generation product prepared in the step (5), and stirring and reacting for 3 hours under the condition that the stirring speed is 500r/min and the temperature is controlled to be 70 ℃ to obtain the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups.
Example eight
(1) Adding a solution prepared by dissolving 4.6 parts of glycerol in 15 parts of DMF and 26.1 parts of IPDI into a three-necked bottle with stirring, controlling the temperature to be 85 ℃ under the condition of stirring speed of 200r/min, and stirring for reaction for 3.5 hours to obtain a first-generation product;
(2) quickly dripping a solution of 20.4 parts of pentaerythritol dissolved in 40 parts of DMF into the first-generation product prepared in the step (1), controlling the temperature to be 85 ℃ under the condition of stirring speed of 200r/min, and stirring for reaction for 3 hours to obtain a second-generation product;
(3) dropwise adding 75.6 parts of HDI into the second-generation product prepared in the step (2), controlling the temperature to be 80 ℃ under the condition that the stirring speed is 300r/min, and stirring for reacting for 3 hours to obtain a third-generation product;
(4) quickly dripping a solution of 40.5 parts of butanediol dissolved by 80 parts of DMF into the first generation product prepared in the step (1), controlling the temperature to be 80 ℃ under the condition of stirring speed of 300r/min, and stirring for reaction for 3 hours to obtain a fourth generation product;
(5) dropwise adding 75.6 parts of HDI into the fourth-generation product prepared in the step (4), controlling the temperature to be 75 ℃ under the condition that the stirring speed is 350r/min, and stirring for reacting for 3.5 hours to obtain a fifth-generation product;
(6) quickly dripping a solution of 61.2 parts of pentaerythritol dissolved in 150 parts of DMF into the fifth generation product prepared in the step (1), controlling the temperature to be 75 ℃ under the condition of stirring speed of 400r/min, and stirring for reaction for 3 hours to obtain a sixth generation product;
(7) 226.8 parts of HDI is added into the product of the sixth generation prepared in the step (6) in a dropwise manner, the temperature is controlled to be 75 ℃ under the condition that the stirring speed is 400r/min, and the stirring reaction is carried out for 3 hours, so as to obtain a product of the seventh generation;
(8) a solution of 243 parts of glucose dissolved in 240 parts of DMF is quickly dripped into the seven-generation product prepared in the step (7), and the mixture is stirred and reacted for 3 hours under the condition that the stirring speed is 500r/min and the temperature is controlled to be 70 ℃, so that the hyperbranched polyurethane with a large number of end-ortho hydroxyl groups is obtained.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The application of the hyperbranched polyurethane is characterized in that the hyperbranched polyurethane is applied to extracting boron from salt lake brine, industrial wastewater or seawater;
the preparation method of the hyperbranched polyurethane comprises the following steps:
(1) adding a solution of 4.6-9.1 parts of polyol A dissolved by 15-30 parts of solvent and 25.2-78.6 parts of isocyanate into a three-neck flask with a stirrer, controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 500r/min, and stirring for reaction for 2-4h to obtain a first-generation product;
(2) quickly dripping a solution of 9.3-240 parts of polyol B dissolved by 20-240 parts of solvent into the first generation product prepared in the step (1), controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 150-500r/min, and stirring for reaction for 2-4h to obtain a second generation product;
(3) dripping 25.2-235.8 parts of isocyanate into the second generation product prepared in the step (2), controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 150-500r/min, and stirring for reaction for 2-4h to obtain a third generation product;
(4) quickly dripping a solution of 13.8-175.5 parts of polyol C dissolved by 30-300 parts of solvent into the third-generation product prepared in the step (3), controlling the temperature to be 70-90 ℃ under the condition of stirring speed of 150-500r/min, and stirring for reacting for 2-4h to obtain hyperbranched polyurethane with a large number of end-ortho hydroxyl groups;
wherein the polyalcohol A is one or more of pentaerythritol, glycerol, trimethylolpropane, xylitol, sorbitol, glucose or fructose;
the isocyanate is one or more of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), 4-dicyclohexylmethane diisocyanate (HMDI) or Hexamethylene Diisocyanate (HDI);
the polyalcohol B is one or more of pentaerythritol, glycerol, trimethylolpropane, ethylene glycol, propylene glycol, butanediol, dipropylene glycol, polyethylene glycol-100, polyethylene glycol-200, polyethylene glycol-400, polyethylene glycol-600 or polyethylene glycol-800;
the polyalcohol C is one or more of glycerol, sorbitol, meglumine, glucose or fructose.
2. Use of a hyperbranched polyurethane according to claim 1, characterized in that: the solvent is N, N-Dimethylformamide (DMF).
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| CN115350684B (en) * | 2022-08-16 | 2023-09-22 | 青海师范大学 | Modified attapulgite boron adsorbent and preparation method and application thereof |
| CN115350687B (en) * | 2022-08-16 | 2023-10-24 | 青海师范大学 | Attapulgite composite material and preparation method and application thereof |
| CN115182168A (en) * | 2022-08-23 | 2022-10-14 | 锡海柯(绍兴)新材料科技有限公司 | Preparation method of xylitol modified polyurethane doped with nano aluminum powder coating |
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