CN103804622A - High-performance thermoplastic polyurethane and its preparation method - Google Patents
High-performance thermoplastic polyurethane and its preparation method 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
- C08G18/65—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
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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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
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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
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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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
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- Polyurethanes Or Polyureas (AREA)
Abstract
The invention belongs to the technical field of polymer materials and relates to thermoplastic polyurethane and its preparation method. The thermoplastic polyurethane comprises the following components by weight: 20 to 50 parts of polyether polyol, 45 to 65 parts of diisocyanate and 5 to 20 parts of a chain extender. According to the invention, the one-step method is adopted for preparation of the thermoplastic polyurethane, polyol with low molecular weight or a compound of polyols with high molecular weight and low molecular weight, diisocyanate with different structures and the chain extender are employed, so the thermoplastic polyurethane with high hardness and high toughness is prepared.
Description
Technical field
The invention belongs to technical field of polymer materials, relate to a kind of high-performance thermoplastic polyurethane and preparation method thereof.
Background technology
High rigidity thermoplastic polyurethane refers generally to Shao Shi D hardness and is greater than 70, is widely used in and makes pressure roll, bearing, gear, punching die, bowling, sole and cable aspect etc.But the application of current domestic high rigidity thermoplastic polyurethane is also quite limited, because the preparation of high hardness polyurethane mainly adopts pre-polymerization method, improve hardness by the method that improves hard segment content.Concerning pre-polymerization method, improving hard segment content must increase the consumption of isocyanic ester and chainextender, and in general the performed polymer of high hardness polyurethane system has higher NCO content, and NCO content is higher, gel time when performed polymer chain extension is shorter, and system viscosity rises rapidly.Test shows, generally, prepare the urethane that Shao Shi D hardness is greater than 70, and NCO massfraction should be higher than 10%, and the gel time of this high NCO content system is less than 1min.Even if adopt low-free TDI technology, also can only make gel time extend to 3.5min.This method is prepared high rigidity thermoplastic polyurethane, because gel time is short, has affected actual production, and this has limited the application of high hardness polyurethane to a certain extent, particularly application at home.On the other hand, improve the hardness of thermoplastic polyurethane by increasing blindly the consumption of isocyanic ester and chainextender, but it can reduce urethane other performances, such as impact property.
Summary of the invention
Provide a kind of high rigidity, high-toughness thermoplastic urethane and preparation method thereof in order to overcome defect of the prior art.
For achieving the above object, the technical solution used in the present invention is as follows:
The present invention adopts single stage method, select that low-molecular-weight polyvalent alcohol or high low molecular weight polyols are composite, vulcabond and the chainextender of different structure, has prepared the thermoplastic polyurethane of high rigidity, high tenacity.
A kind of thermoplastic polyurethane, made by the component that comprises following weight part:
20～50 parts of polyether glycols,
45～65 parts of vulcabond,
5～20 parts of chainextenders.
Described polyether glycol molecular weight is 200～2000, is selected from one or more in polyoxyethylene glycol, polypropylene glycol or polytetrahydrofuran diol.
Described vulcabond is selected from as Toluene-2,4-diisocyanate, 4-vulcabond (TDI), 4,4 '-'-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI) or isophorone diisocyanate (IPDI).
It is 3,3 '-bis-chloro-4 that described chainextender is selected from, 4'-diaminodiphenyl-methane, pyrocatechol, 1,6-hexylene glycol, ethylene glycol or BDO.
A kind of preparation method of above-mentioned thermoplastic polyurethane, comprise the following steps: (1) takes 20～50 parts of dry polyether glycols, 5～20 parts of chainextenders that were dried mix with the vulcabond of 45～65 parts, stirring vacuumizes, and stirs, and pours in the mould of preheating;
(2) by the compound in step (1) curing, slaking in mould, be cooled to room temperature, obtain high-performance thermoplastic polyurethane.
In described step (1), the dry condition of polyether glycol is: vacuum hydro-extraction 2～4h under 100～120 ℃ of conditions.
In described step (1), the dry condition of chainextender is: vacuum hydro-extraction 2～4h under 100～120 ℃ of conditions.
In described step (1), churning time is 3～5min, and stirring velocity is 100～120r/min.
In described step (1), mould scribbles silicone release agent in advance, will scribble the mould and die preheating of releasing agent, and preheating temperature is 90～110 ℃.
In described step (2), solidify and refer at vacuum drying oven, temperature is at 90～110 ℃, to carry out deaeration to solidify, and the curing time is 2～4h.
In described step (2), the temperature of slaking is 120～160 ℃, and the time is 6～10h.
The present invention compared with prior art, has the following advantages and beneficial effect:
1, the common gel time of performed polymer is short, unfavorable actual production, and the single stage method adopting not as the present invention easily operates.
2, the present invention selects low-molecular-weight polyvalent alcohol or high low molecular weight polyols is composite, vulcabond and the chainextender of different structure, has prepared the high-performance thermoplastic polyurethane of high rigidity, high tenacity.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
In following examples, polyether glycol used dehydrates condition and is: vacuum hydro-extraction 2～4h under 100～120 ℃ of conditions.
The dry condition of chainextender used in following examples is: vacuum hydro-extraction 2～4h under 100～120 ℃ of conditions.
Embodiment 1
(1) by polypropylene glycol (molecular weight is 400) and 1,6-hexylene glycol is vacuum hydro-extraction 4h at 100 ℃ respectively, take 20 parts of polypropylene glycols that were dried (molecular weight is 400), 18.9 parts of chainextenders that were dried 1,6-hexylene glycol and 61.1 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 120r/min stirring velocity, stir and vacuumize 3min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 90 ℃) that scribbles silicone release agent, at 90 ℃ of vacuum drying ovens, solidify 4h, and slaking is 10h at 120 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 2
(1) by polypropylene glycol (molecular weight is 1000) and 3,3'-bis-chloro-4,4'-diaminodiphenyl-methane is vacuum hydro-extraction 2h at 120 ℃ respectively, take 20 parts of polypropylene glycols that were dried (molecular weight is 1000), 19.8 parts of chainextenders that were dried 3,3'-bis-is chloro-4,4'-diaminodiphenyl-methane and 59.7 part 4, and 4 '-'-diphenylmethane diisocyanate MDI mixes, under 120r/min stirring velocity, stir and vacuumize 3min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 95 ℃) that scribbles silicone release agent, at 95 ℃ of vacuum drying ovens, solidify 3.5h, and slaking is 9h at 130 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 3
(1) by polypropylene glycol (molecular weight is 200), polytetrahydrofuran diol (molecular weight is 2000) and 1,6-hexylene glycol is vacuum hydro-extraction 3h at 110 ℃ respectively, take 20 parts of polypropylene glycols that were dried (molecular weight is 200) and polytetrahydrofuran diol (molecular weight is 2000) (wherein the weight fraction of polypropylene glycol and polytetrahydrofuran is than 5:1), 15 parts of dry chainextenders 1,6-hexylene glycol and 65 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 120r/min stirring velocity, stir and vacuumize 3min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 100 ℃) that scribbles silicone release agent, at 100 ℃ of vacuum drying ovens, solidify 3h, and slaking is 8h at 140 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 4
(1) by polypropylene glycol (molecular weight is 1000) and 1,6-hexylene glycol is vacuum hydro-extraction 4h at 100 ℃ respectively, take 30 parts of polypropylene glycols that were dried (molecular weight is 1000), 20 parts of dry chainextenders 1,6-hexylene glycol and 50 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 110r/min stirring velocity, stir and vacuumize 4min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 105 ℃) that scribbles silicone release agent, at 105 ℃ of vacuum drying ovens, solidify 2.5h, and slaking is 7h at 150 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 5
(1) by polytetrahydrofuran diol (molecular weight is 400), 1,6-hexylene glycol is vacuum hydro-extraction 3h at 110 ℃ respectively, take 32 parts of polytetrahydrofuran diols that were dried (molecular weight is 400), 12.9 parts of dry chainextenders 1,6-hexylene glycol and 55 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 110r/min stirring velocity, stir and vacuumize 4min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 110 ℃) that scribbles silicone release agent, at 110 ℃ of vacuum drying ovens, solidify 2h, and slaking is 6h at 160 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 6
(1) by polyoxyethylene glycol (molecular weight is 600) and 1,4-butyleneglycol is vacuum hydro-extraction 4h at 100 ℃ respectively, take 35 parts of polyoxyethylene glycol that were dried (molecular weight is 600), 18.9 parts of dry chainextenders 1,4-butyleneglycol and 46.1 parts of hexamethylene diisocyanate HDI mix, under 110r/min stirring velocity, stir and vacuumize 4min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 105 ℃) that scribbles silicone release agent, at 105 ℃ of vacuum drying ovens, solidify 2.5h, and slaking is 10h at 120 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 7
(1) by polyoxyethylene glycol (molecular weight is 1000) and pyrocatechol vacuum hydro-extraction 2h at 120 ℃ respectively, take 40 parts of polyoxyethylene glycol that were dried (molecular weight is 1000), 15.0 parts of dry chainextender pyrocatechols and 45.0 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 100r/min stirring velocity, stir and vacuumize 5min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 90 ℃) that scribbles silicone release agent, at 90 ℃ of vacuum drying ovens, solidify 4h, and slaking is 6h at 160 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 8
(1) by polypropylene glycol (molecular weight is 800) and ethylene glycol vacuum hydro-extraction 4h at 100 ℃ respectively, take 41.4 parts of polypropylene glycols that were dried (molecular weight is 800), 12.5 parts of dry glycol chain extenders and 46.1 parts of Toluene-2,4-diisocyanates, 4-vulcabond TDI mixes, under 100r/min stirring velocity, stir and vacuumize 5min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 95 ℃) that scribbles silicone release agent, at 95 ℃ of vacuum drying ovens, solidify 3.5h, and slaking is 9h at 130 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 9
(1) by polypropylene glycol (molecular weight is 400), polyoxyethylene glycol (molecular weight 1000) and 1,4-butyleneglycol is vacuum hydro-extraction 3h at 110 ℃ respectively, take 45 parts of polypropylene glycols that were dried (molecular weight is 400) and polyoxyethylene glycol (molecular weight 1000) (weight part ratio is 4:1), 9.3 parts of dry chainextenders 1,4-butyleneglycol and 45.7 parts of isophorone diisocyanate IPDI mix, under 100r/min stirring velocity, stir and vacuumize 5min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 105 ℃) that scribbles silicone release agent, at 105 ℃ of vacuum drying ovens, solidify 2.5h, and slaking is 7h at 150 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 10
(1) by polypropylene glycol (molecular weight is 400) and 1,6-hexylene glycol is vacuum hydro-extraction 3h at 110 ℃ respectively, take 47.9 parts of polypropylene glycols that were dried (molecular weight is 400), 5.0 parts of chainextenders that were dried 1,6-hexylene glycol and 47.1 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 100r/min stirring velocity, stir and vacuumize 5min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 105 ℃) that scribbles silicone release agent, at 105 ℃ of vacuum drying ovens, solidify 2.5h, and slaking is 7h at 150 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
Embodiment 11
(1) by polypropylene glycol (molecular weight is 400) and 1,6-hexylene glycol is vacuum hydro-extraction 3h at 110 ℃ respectively, take 50 parts of polypropylene glycols that were dried (molecular weight is 400), 5.7 parts of chainextenders that were dried 1,6-hexylene glycol and 46.1 part 4,4 '-'-diphenylmethane diisocyanate MDI mixes, under 100r/min stirring velocity, stir and vacuumize 5min, mix;
(2) above-mentioned even mixed solution is poured in the mould (preheating temperature is 105 ℃) that scribbles silicone release agent, at 105 ℃ of vacuum drying ovens, solidify 2.5h, and slaking is 7h at 150 ℃;
(3) high-performance thermoplastic polyurethane good slaking is taken out, be cooled to room temperature, survey its mechanical property, hardness is measured according to GB/T531-2009, tensile strength is measured according to GB/T 528-2009, simply supported beam notch shock performance is measured according to GB/T1043-2008, and the performance test results is in table 1.
The physicals of table 1 thermoplastic polyurethane
| Performance index | Shao D hardness | Tensile strength/MPa | Shock strength/kJm -2 |
| Embodiment 1 | 88 | 75.3 | 8.1 |
| Embodiment 2 | 87 | 68.2 | 7.9 |
| Embodiment 3 | 89 | 76.8 | 8.0 |
| Embodiment 4 | 80 | 65.4 | 8.3 |
| Embodiment 5 | 87 | 73.7 | 7.8 |
| Embodiment 6 | 82 | 67.1 | 8.0 |
| Embodiment 7 | 84 | 68.3 | 7.4 |
| Embodiment 8 | 83 | 67.6 | 7.0 |
| Embodiment 9 | 85 | 72.5 | 8.3 |
| Embodiment 10 | 81 | 70.0 | 8.4 |
| Embodiment 11 | 80 | 64.9 | 8.6 |
From table 1, embodiment can find out, the hardness of thermoplastic polyurethane is all greater than Shao 80D, and tensile strength is all greater than 60Mpa, and shock strength is all greater than 7.0kJ/m
2, illustrate that the thermoplastic polyurethane making has higher hardness and impact property.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (10)
1. a thermoplastic polyurethane, is characterized in that: be made up of the component that comprises following weight part:
20 ~ 50 parts of polyether glycols,
45 ~ 65 parts of vulcabond,
5 ~ 20 parts of chainextenders.
2. thermoplastic polyurethane according to claim 1, is characterized in that: described polyether glycol molecular weight is 200 ~ 2000, is selected from one or more in polyoxyethylene glycol, polypropylene glycol or polytetrahydrofuran diol.
3. thermoplastic polyurethane according to claim 1, is characterized in that: described vulcabond is selected from Toluene-2,4-diisocyanate, 4-vulcabond, 4,4 '-'-diphenylmethane diisocyanate, hexamethylene diisocyanate or isophorone diisocyanate.
4. thermoplastic polyurethane according to claim 1, is characterized in that: described chainextender is selected from 3,3 '-bis-chloro-4,4'-diaminodiphenyl-methane, pyrocatechol, 1,6-hexylene glycol, ethylene glycol or BDO.
5. a preparation method for arbitrary described thermoplastic polyurethane in claim 1-4, is characterized in that: the method comprises the following steps:
(1) take 20 ~ 50 parts of polyether glycols that were dried, 5 ~ 20 parts of chainextenders that were dried mix with the vulcabond of 45 ~ 65 parts, stirring vacuumizes, and stirs, and pours in the mould of preheating;
(2) curing, slaking, is cooled to room temperature, obtains high-performance thermoplastic polyurethane.
6. preparation method according to claim 5, is characterized in that: in described step (1), the dry condition of polyether glycol is: vacuum hydro-extraction 2 ~ 4h under 100 ~ 120 ℃ of conditions;
Or in described step (1), the dry condition of chainextender is: vacuum hydro-extraction 2 ~ 4h under 100 ~ 120 ℃ of conditions.
7. preparation method according to claim 5, is characterized in that: in described step (1), churning time is 3 ~ 5min, and stirring velocity is 100 ~ 120r/min.
8. preparation method according to claim 5, is characterized in that: in described step (1), mould scribbles silicone release agent in advance, will scribble the mould and die preheating of releasing agent, and preheating temperature is 90 ~ 110 ℃.
9. preparation method according to claim 5, is characterized in that: in described step (2), solidify and refer at vacuum drying oven, temperature is at 90 ~ 110 ℃, to carry out deaeration to solidify, and the curing time is 2 ~ 4h.
10. preparation method according to claim 5, is characterized in that: in described step (2), the temperature of slaking is 120 ~ 160 ℃, and the time is 6 ~ 10h.
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| CN114874607B (en) * | 2022-06-27 | 2024-01-26 | 烟台辰宇汽车部件有限公司 | Polyurethane for bearing and preparation method thereof |
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