CN113754849A - Non-filler type bio-based degradable polyurethane sponge and preparation method thereof - Google Patents
Non-filler type bio-based degradable polyurethane sponge and preparation method thereof Download PDFInfo
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- CN113754849A CN113754849A CN202111094792.XA CN202111094792A CN113754849A CN 113754849 A CN113754849 A CN 113754849A CN 202111094792 A CN202111094792 A CN 202111094792A CN 113754849 A CN113754849 A CN 113754849A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 48
- 239000004814 polyurethane Substances 0.000 title claims abstract description 48
- 239000000945 filler Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims description 15
- 229920005862 polyol Polymers 0.000 claims abstract description 43
- 150000003077 polyols Chemical class 0.000 claims abstract description 43
- 239000003054 catalyst Substances 0.000 claims abstract description 38
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 32
- 239000004626 polylactic acid Substances 0.000 claims abstract description 30
- HIFVAOIJYDXIJG-UHFFFAOYSA-N benzylbenzene;isocyanic acid Chemical class N=C=O.N=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 HIFVAOIJYDXIJG-UHFFFAOYSA-N 0.000 claims abstract description 26
- 235000012424 soybean oil Nutrition 0.000 claims abstract description 20
- 239000003549 soybean oil Substances 0.000 claims abstract description 20
- 239000004094 surface-active agent Substances 0.000 claims abstract description 20
- 229920002472 Starch Polymers 0.000 claims abstract description 17
- 239000008107 starch Substances 0.000 claims abstract description 17
- 235000019698 starch Nutrition 0.000 claims abstract description 17
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 229920000570 polyether Polymers 0.000 claims abstract description 16
- 239000004088 foaming agent Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005187 foaming Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 10
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 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 6
- 239000002028 Biomass Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 150000001412 amines Chemical class 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 125000005375 organosiloxane group Chemical group 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 150000005846 sugar alcohols Polymers 0.000 claims description 5
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 4
- 239000000463 material Substances 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000009264 composting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- C08G18/65—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
- C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
-
- 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
- C08G18/36—Hydroxylated esters of higher fatty acids
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/428—Lactides
-
- 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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
-
- 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
- C08G2101/00—Manufacture of cellular products
-
- 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
- C08G2230/00—Compositions for preparing biodegradable polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to the technical field of polyurethane sponge, in particular to non-filler type bio-based degradable polyurethane sponge, which comprises the following components in parts by mass: 40-60 parts of starch modified polyether polyol, 40-60 parts of soybean oil polyol, 2-3 parts of surfactant, 0-5 parts of physical foaming agent, 0.5-3 parts of composite catalyst, 1-4 parts of water and 30-40 parts of polylactic acid modified diphenylmethane diisocyanate.
Description
Technical Field
The invention relates to the technical field of polyurethane sponge, in particular to non-filler type bio-based degradable polyurethane sponge and a preparation method thereof.
Background
Polyurethane sponge is often used in the aspects of people's life such as sofas, mattresses, pillows, car seats and the like. The traditional polyurethane sponge is prepared from petroleum products, and due to the non-regenerability of petroleum, the future development of polyurethane materials is restricted by the reduction of petroleum resources; greenhouse gas emissions from the production of petroleum derived materials are also a global concern for ecology. The structure of the polyurethane material causes the material to be almost non-degradable, and plastic pollution brings huge burden to the environment along with the waste of a large amount of polyurethane products after use. Due to the excellent designability and wide application of polyurethane, researchers at home and abroad have conducted extensive research in recent decades. However, most of them focus on the adjustment of the functionality of polyurethane, and less research on biodegradable polyurethane materials is involved.
CN110698626A completes the high-density polyurethane shoe material bio-based polyurethane by preparing polylactide polyol as a main component of polyol, but due to the activity limitation of the polylactide polyol, the polyacrylate polyol is only suitable for high-density products, the production efficiency is greatly reduced, and the polyacrylate polyol is not suitable for low-density polyurethane sponge.
CN110423483A describes a bio-based degradable foam material and a preparation method thereof, which mainly adds various fillers to achieve the degradability of polyurethane sponge, the degradation of the manner is only the degradation of the fillers, and the problem of the degradation of the polyurethane structure is not solved. And the physical properties of the obtained polyurethane sponge are poor due to the influence of the filler, so that the physical properties of the polyurethane sponge in the market are difficult to meet.
Therefore, we propose a non-filler type bio-based degradable polyurethane sponge and a preparation method thereof to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a non-filler type bio-based degradable polyurethane sponge and a preparation method thereof.
A non-filler type bio-based degradable polyurethane sponge comprises the following components in parts by mass: 40-60 parts of starch modified polyether polyol, 40-60 parts of soybean oil polyol, 2-3 parts of surfactant, 0-5 parts of physical foaming agent, 0.5-3 parts of composite catalyst, 1-4 parts of water and 30-40 parts of polylactic acid modified diphenylmethane diisocyanate.
Preferably, the starch modified polyether polyol has a molecular weight of 1500-7000 and a functionality of 3-5.
Preferably, the molecular weight of the soybean oil polyol is 800-6000, the functionality is 1-5, and the biomass carbon content is more than or equal to 96 percent.
Preferably, the surfactant is organosiloxane, and the surfactant is one or more of L-5333, B8871, L580,2470, L6900, B-8409 and L8002.
Preferably, the composite catalyst is one or more of an amine catalyst and an organic metal catalyst, wherein the organic metal catalyst comprises a catalyst prepared from 70% by mass of diether and 30% by mass of dipropylene glycol, a liquid catalyst containing 33% of triethylene diamine and a stannous octoate catalyst.
A preparation method of non-filler type bio-based degradable polyurethane sponge comprises the following steps:
s1, preparation of polylactic acid modified diphenylmethane diisocyanate:
a. vacuum dehydrating polylactic acid polyalcohol at 100 deg.C and 0.08MPA for 50-70 min;
b. dripping into 80 ℃ diphenylmethane diisocyanate in a dripping mode, and reacting for 1.8-2.2h at constant temperature until the reaction is finished;
c. obtaining polylactic acid modified diphenylmethane diisocyanate;
s2, adding the starch modified polyether polyol, the soybean oil polyol, the surfactant, the physical foaming agent, the composite catalyst and water in sequence according to the proportion, stirring uniformly, and then adding the polylactic acid modified diphenylmethane diisocyanate prepared in the S1;
s3, uniformly mixing all the components in the S2 at a high speed by using a 3000rpm/min stirrer, pouring the mixture into a foaming box for free foaming or continuously foaming by using a continuous foaming machine after the mixture is mixed for 4-5S;
s4, curing for 20-26h, and cutting into a customized shape to obtain the non-filler type bio-based degradable polyurethane sponge.
Preferably, the NCO content of the polylactic acid modified diphenylmethane diisocyanate is 25-27%.
The invention has the beneficial effects that:
1. according to the invention, starch modified polyol and soybean oil polyol which are biologically derived are used as main materials, polylactic acid polyol is pre-polymerized with MDI in advance, and degradable groups are introduced into a polyurethane structure through a chemical reaction, so that the purpose of structural degradation is achieved, and the problem of reaction efficiency caused by low activity of the bio-based groups is solved.
2. The prepared bio-based degradable polyurethane sponge has the tensile strength of more than or equal to 50kpa, the elongation at break of more than or equal to 120%, the permanent compression deformation of 75% or less than or equal to 6, the bio-based content of more than or equal to 30% and the degradation efficiency of a composting method of more than or equal to 30%, and is a commercially-usable bio-based degradable polyurethane sponge.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
In example 1
A non-filler type bio-based degradable polyurethane sponge comprises the following components in parts by mass: 40 parts of starch modified polyether polyol, 60 parts of soybean oil polyol, 2 parts of surfactant, 1 part of physical foaming agent, 0.5 part of composite catalyst, 1 part of water and 30 parts of polylactic acid modified diphenylmethane diisocyanate.
Further, the molecular weight of the starch modified polyether polyol is 1500, and the functionality is 3.
Furthermore, the molecular weight of the soybean oil polyol is 800, the functionality is 1, and the biomass carbon content of the soybean oil polyol is more than or equal to 96%.
Further, the surfactant is organosiloxane, and the surfactants are L-5333 and B8871.
Furthermore, the composite catalyst is an amine catalyst, a catalyst prepared from 70% of diether and 30% of dipropylene glycol by mass fraction, and a liquid catalyst containing 33% of triethylene diamine.
A preparation method of non-filler type bio-based degradable polyurethane sponge comprises the following steps:
s1, preparation of polylactic acid modified diphenylmethane diisocyanate:
a. vacuum dehydrating polylactic acid polyalcohol at 100 deg.C and 0.08MPA for 50 min;
b. dripping into 80 ℃ diphenylmethane diisocyanate in a dripping mode, and reacting for 1.8h at constant temperature until the reaction is finished;
c. obtaining polylactic acid modified diphenylmethane diisocyanate;
s2, adding the starch modified polyether polyol, the soybean oil polyol, the surfactant, the physical foaming agent, the composite catalyst and water in sequence according to the proportion, stirring uniformly, and then adding the polylactic acid modified diphenylmethane diisocyanate prepared in the S1;
s3, uniformly mixing all the components in the S2 at a high speed by using a 3000rpm/min stirrer, and pouring the mixture into a foaming box for free foaming or continuously foaming by using a continuous foaming machine after the mixture is mixed for 4S;
and S4, curing for 20 hours, and cutting into a customized shape to obtain the non-filler type bio-based degradable polyurethane sponge.
Further, the content of NCO in the polylactic acid modified diphenylmethane diisocyanate is 25%.
In example 2
A non-filler type bio-based degradable polyurethane sponge comprises the following components in parts by mass: 50 parts of starch modified polyether polyol, 50 parts of soybean oil polyol, 2.5 parts of surfactant, 2 parts of physical foaming agent, 2 parts of composite catalyst, 3 parts of water and 35 parts of polylactic acid modified diphenylmethane diisocyanate.
Further, the starch modified polyether polyol has a molecular weight of 4000 and a functionality of 4.
Furthermore, the molecular weight of the soybean oil polyol is 4000, the functionality is 3, and the biomass carbon content of the soybean oil polyol is more than or equal to 96%.
Further, the surfactant is organosiloxane, and the surfactants are L580,2470, L6900, B-8409 and L8002.
Furthermore, the composite catalyst is prepared by matching an amine catalyst, a liquid catalyst containing 33% of triethylene diamine and a stannous octoate catalyst.
A preparation method of non-filler type bio-based degradable polyurethane sponge comprises the following steps:
s1, preparation of polylactic acid modified diphenylmethane diisocyanate:
a. vacuum dehydrating polylactic acid polyalcohol at 100 deg.C and 0.08MPA for 60 min;
b. dripping into 80 ℃ diphenylmethane diisocyanate in a dripping mode, and reacting for 2 hours at constant temperature until the reaction is finished;
c. obtaining polylactic acid modified diphenylmethane diisocyanate;
s2, adding the starch modified polyether polyol, the soybean oil polyol, the surfactant, the physical foaming agent, the composite catalyst and water in sequence according to the proportion, stirring uniformly, and then adding the polylactic acid modified diphenylmethane diisocyanate prepared in the S1;
s3, uniformly mixing all the components in the S2 at a high speed by using a 3000rpm/min stirrer, pouring the mixture into a foaming box for free foaming or continuously foaming by using a continuous foaming machine after the mixture is mixed for 4.5S;
and S4, curing for 24 hours, and cutting into a customized shape to obtain the non-filler type bio-based degradable polyurethane sponge.
Further, the NCO content of the polylactic acid-modified diphenylmethane diisocyanate was 26%.
In example 3
A non-filler type bio-based degradable polyurethane sponge comprises the following components in parts by mass: 60 parts of starch modified polyether polyol, 40 parts of soybean oil polyol, 3 parts of surfactant, 5 parts of physical foaming agent, 3 parts of composite catalyst, 4 parts of water and 40 parts of polylactic acid modified diphenylmethane diisocyanate.
Further, the starch modified polyether polyol has a molecular weight of 7000 and a functionality of 5.
Furthermore, the molecular weight of the soybean oil polyol is 6000, the functionality is 5, and the biomass carbon content of the soybean oil polyol is more than or equal to 96%.
Further, the surfactant is organosiloxane, and the surfactants are L580,2470, and L6900.
Furthermore, the composite catalyst is prepared by matching an amine catalyst, a catalyst prepared from 70 mass percent of diether and 30 mass percent of dipropylene glycol, a liquid catalyst containing 33 mass percent of triethylene diamine and a stannous octoate catalyst.
A preparation method of non-filler type bio-based degradable polyurethane sponge comprises the following steps:
s1, preparation of polylactic acid modified diphenylmethane diisocyanate:
a. vacuum dehydrating polylactic acid polyalcohol at 100 deg.C and 0.08MPA for 70 min;
b. dripping into 80 ℃ diphenylmethane diisocyanate in a dripping mode, and reacting for 1.8-2.2h at constant temperature until the reaction is finished;
c. obtaining polylactic acid modified diphenylmethane diisocyanate;
s2, adding the starch modified polyether polyol, the soybean oil polyol, the surfactant, the physical foaming agent, the composite catalyst and water in sequence according to the proportion, stirring uniformly, and then adding the polylactic acid modified diphenylmethane diisocyanate prepared in the S1;
s3, uniformly mixing all the components in the S2 at a high speed by using a 3000rpm/min stirrer, pouring the mixture into a foaming box for free foaming or continuously foaming by using a continuous foaming machine after the mixture is mixed for 5S;
and S4, curing for 26h, and cutting into a customized shape to obtain the non-filler type bio-based degradable polyurethane sponge.
Further, the NCO content of the polylactic acid-modified diphenylmethane diisocyanate was 27%.
The performance of the non-filler type bio-based degradable polyurethane sponge obtained according to the examples 1-3 is tested, and the test results are as follows:
from the above table, it is clear that the non-filler type biodegradable polyurethane sponge prepared has excellent physical properties. And the test result of the composting method shows that the sponge generated by the reaction of the bio-based participates in the reaction is fully degraded, and the reticular structure of the sponge is destroyed, so that the sponge can be decomposed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A non-filler type bio-based degradable polyurethane sponge is characterized by comprising the following components in parts by mass: 40-60 parts of starch modified polyether polyol, 40-60 parts of soybean oil polyol, 2-3 parts of surfactant, 0-5 parts of physical foaming agent, 0.5-3 parts of composite catalyst, 1-4 parts of water and 30-40 parts of polylactic acid modified diphenylmethane diisocyanate.
2. The non-filler type biodegradable polyurethane sponge as claimed in claim 1, wherein the molecular weight of the starch modified polyether polyol is 1500-7000 and the functionality is 3-5.
3. The non-filler type bio-based degradable polyurethane sponge as claimed in claim 1, wherein the molecular weight of the soybean oil polyol is 800-6000, the functionality is 1-5, and the biomass carbon content is not less than 96%.
4. The non-filler type bio-based degradable polyurethane sponge according to claim 1, wherein said surfactant is an organosiloxane.
5. The non-filler type bio-based degradable polyurethane sponge according to claim 1, wherein the composite catalyst is one or more of an amine catalyst and an organic metal catalyst, wherein the organic metal catalyst comprises a catalyst prepared from 70% by mass of diether and 30% by mass of dipropylene glycol, a liquid catalyst containing 33% of triethylene diamine, and a stannous octoate catalyst.
6. A method for preparing a non-filler based biodegradable polyurethane sponge according to claim 1, comprising the steps of:
s1, preparation of polylactic acid modified diphenylmethane diisocyanate:
a. vacuum dehydrating polylactic acid polyalcohol at 100 deg.C and 0.08MPA for 50-70 min;
b. dripping into 80 ℃ diphenylmethane diisocyanate in a dripping mode, and reacting for 1.8-2.2h at constant temperature until the reaction is finished;
c. obtaining polylactic acid modified diphenylmethane diisocyanate;
s2, adding the starch modified polyether polyol, the soybean oil polyol, the surfactant, the physical foaming agent, the composite catalyst and water in sequence according to the proportion, stirring uniformly, and then adding the polylactic acid modified diphenylmethane diisocyanate prepared in the S1;
s3, uniformly mixing all the components in the S2 at a high speed by using a 3000rpm/min stirrer, pouring the mixture into a foaming box for free foaming or continuously foaming by using a continuous foaming machine after the mixture is mixed for 4-5S;
s4, curing for 20-26h, and cutting into a customized shape to obtain the non-filler type bio-based degradable polyurethane sponge.
7. The method for preparing the non-filler type bio-based degradable polyurethane sponge according to claim 6, wherein the NCO content of the polylactic acid modified diphenylmethane diisocyanate is 25-27%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115612059A (en) * | 2022-11-02 | 2023-01-17 | 东莞市腾崴塑胶制品有限公司 | Bio-based sponge |
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2021
- 2021-09-17 CN CN202111094792.XA patent/CN113754849A/en active Pending
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