CN109912761A - A kind of extra soft polyurethane wet process bass and preparation method thereof - Google Patents
A kind of extra soft polyurethane wet process bass and preparation method thereof Download PDFInfo
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- CN109912761A CN109912761A CN201910067662.3A CN201910067662A CN109912761A CN 109912761 A CN109912761 A CN 109912761A CN 201910067662 A CN201910067662 A CN 201910067662A CN 109912761 A CN109912761 A CN 109912761A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 39
- 239000004814 polyurethane Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-dimethylformamide Substances CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000004970 Chain extender Substances 0.000 claims abstract description 14
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 12
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 9
- 230000008719 thickening Effects 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 8
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 50
- QWGRWMMWNDWRQN-UHFFFAOYSA-N 2-methylpropane-1,3-diol Chemical compound OCC(C)CO QWGRWMMWNDWRQN-UHFFFAOYSA-N 0.000 claims description 13
- 229940100573 methylpropanediol Drugs 0.000 claims description 13
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- 229910052797 bismuth Inorganic materials 0.000 claims description 10
- -1 bismuth carboxylate Chemical class 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 7
- 229920000728 polyester Polymers 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229920002521 macromolecule Polymers 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 8
- 239000006260 foam Substances 0.000 abstract description 7
- 150000001450 anions Chemical class 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 229920005862 polyol Polymers 0.000 abstract description 2
- 150000003077 polyols Chemical class 0.000 abstract description 2
- 229920003002 synthetic resin Polymers 0.000 abstract 1
- 239000000057 synthetic resin Substances 0.000 abstract 1
- 239000002649 leather substitute Substances 0.000 description 21
- 238000010792 warming Methods 0.000 description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- 239000010985 leather Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005749 polyurethane resin Polymers 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 235000011007 phosphoric acid Nutrition 0.000 description 3
- 238000007086 side reaction Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 125000004185 ester group Chemical group 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 206010000269 abscess Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a kind of extra soft polyurethane wet process bass and preparation method thereof；The preparation method is as follows: step 1, by polyalcohol and excessive MDI investment reaction unit, R value is set as 2, and 1 h is reacted at 50 ~ 60 DEG C；Step 2, continue that solvent DMF and chain extender are added thereto；Step 3, it is stirring evenly and then adding into MDI, catalyst and DMF, it is made to carry out thickening reaction, R value is set as 1；Step 4, methanol and anionic surfactant and nonionic surfactant are added when terminal, viscosity control is 25 ~ 300,000 after terminating reaction, solid content 30%.The present invention has used the polyester polyol of high molecular weight when preparing, and anion and nonionic surfactant is added simultaneously in synthetic resin.Polyol molecular weight is higher, and crystal property is weaker, thus prepared wet process bass is softer.By the synergistic effect between anion and nonionic surfactant, so that polyurethane wet bass sufficiently foams, so that bass thickness is higher and softer.
Description
Technical field
The invention belongs to Synthetic Leather preparation field, more particularly, to a kind of extra soft polyurethane wet process bass and its
Preparation method.
Background technique
Advanced polyurethane resin is widely used in the fields such as synthetic leather, adhesive, foam, pressure sensitive adhesive, paint and coating.
Synthetic Leather has many advantages, such as that meat true feeling is good, wear-resisting, peel strength is high and elasticity is good, is just gradually replacing corium in market
Status.Synthetic leather main species in the market have: high/low rebound, hydrolysis, without xanthochromia, without abscess and burnt discoloration etc..Ultra-soft
The synthetic leather of matter is not common on the market, but existing downstream leather factory the synthetic leather of ultra-soft matter is shown it is dense emerging
Interest.The more other kinds of synthetic leather of synthetic leather dress of ultra-soft matter is more comfortable, " no bony " is shown as, especially suitable for clothes
The production of leather.The preparation method of conventional polyurethanes resin is divided into pre-polymerization method and one-step method, the synthetic leather of pre-polymerization method preparation have compared with
High hardness and bass thickness, one-step method then have better resilience performance.
Summary of the invention
There are various types of Synthetic Leathers currently on the market, but ultra-soft matter type is less, is this this hair
First bright purpose is to provide a kind of extra soft polyurethane wet process bass；
A second object of the present invention is to provide a kind of preparation methods of extra soft polyurethane wet process bass.
The technical solution used to solve the technical problems of the present invention is that:
A kind of preparation method of extra soft polyurethane wet process bass, the specific steps are as follows:
Step 1, by polyalcohol and excessive MDI investment reaction unit, R value is set as 2, reacts at 50~60 DEG C
1h；
Step 2, continue that solvent dimethylformamide (DMF) and chain extender are added into reaction unit；
Step 3, it is stirring evenly and then adding into MDI, catalyst and DMF, it is made to carry out thickening reaction, R value is set as 1；
Step 4, methanol and anionic surfactant and nonionic surfactant are added when terminal, is reacted terminating
Viscosity control is 25~300,000 afterwards, solid content 30%.
Preparation method of the invention and customary preparation methods have an apparent difference, preparation method of the invention in two steps into
Row.It allows polyalcohol to carry out reacting 1h in 50~60 DEG C with excessive MDI first, then adds solvent DMF and chain extender.This side
Method, which is advantageous in that between the polyurethane molecular chain hard section to be formed and soft segment, to be distributed more uniformly, i.e., soft and hard segments are intervally arranged.Instead
Temperature is answered to be controlled in 50~60 DEG C, excessively high reaction temperature can make that self-polymeric reaction occurs between MDI, and side reaction increases.
As the optimal technical scheme of the application, the polyalcohol is high-molecular-weight poly ester polyol；
Preferably, the polyalcohol is PHA-6000.
Polyalcohol is chosen PHA-6000 and is primarily due in the present invention, and the molecular chain structure of PHA-6000 is longer, possesses
Crystal property is weaker.When reaction generates polyurethane long-chain molecule, the spacing between hard section is larger.H key between corresponding hard section
Active force is then smaller, thus reduces the hardness of synthetic leather.PHA-6000 possesses higher tensile strength compared to PPG-6000,
Because the H key active force formed between ester group key is better than the H key active force formed between ehter bond.Therefore, PHA-6000 is selected
On the basis of keeping synthetic leather that there is ultra-soft material, and can peel strength with higher.
As the optimal technical scheme of the application, in the step 4, anionic surfactant and non-ionic surface active
The mass ratio of agent is 1:3~3:1.
The auxiliary agent of middle and later periods addition of the invention is the surfactant that anion is mixed with nonionic.Polyester has lipophilicity
So that the DMF in polyurethane is not easy from needing to add when wherein deviating from, therefore preparing the polyurethane wet bass of polyester type
Surfactant assists it to remove the DMF in bass.Anionic surfactant can promote wet process bass bass shape in auxiliary agent
At vertical foam structure, nonionic surfactant is able to suppress the solidification of wet process bass, is conducive to more fully remove it
In solvent DMF.The two is used in conjunction with, and enables to foaming more complete.
As the optimal technical scheme of the application, in the step 2, chain extender is diethylene glycol and methyl propanediol.
Chain extender selection diethylene glycol and methyl propanediol in the present invention.There is ehter bond, the H keys of ehter bond to make for diethylene glycol
It is firmly much smaller than ester bond, and ehter bond is more submissive for ester bond.Methyl propanediol since there is pending methyl groups so that
Steric hindrance between polyurethane resin is larger, reduces the crystal property between resin.By early period experimental results demonstrate,
Diethylene glycol and methyl propanediol are used as chain extender simultaneously in use, synergistic effect between the two, can further decrease tree
The crystal property of rouge, so that the synthetic leather of preparation possesses more soft state.
As the optimal technical scheme of the application, in the step 3, catalyst is bismuth carboxylate.That selects in the present invention is weak
There is safety and environmental protection (substituting toxic mercury), good hydrolytic stability (and can prevent for acid carboxylic acid bismuth catalyst, bismuth carboxylate
The side reaction generated between moisture and MDI), the nontoxic and characteristics such as not oxidizable.For being catalyzed polyurethane resin reaction, improving
While reactivity, and the generation of side reaction can be prevented.
As the optimal technical scheme of the application, in the step 1, antioxidant and phosphoric acid is also added.
Preferably, the antioxidant is BHT.
The extra soft polyurethane wet process bass that the present invention also protects above-mentioned preparation method to be prepared.
Above-mentioned extra soft polyurethane wet process bass can be used for the fields such as clothing leather, luggage leather, automotive seat and gloves.
The utility model has the advantages that
As consumption upgrades, the quality requirements of Synthetic Leather are gradually increased in people.The polyurethane of ultra-soft matter closes
The sense of touch of finished leather and human body is very good, especially suitable for the production of clothing leather, possesses huge market value.Therefore ultra-soft matter
Synthetic Leather becomes research hotspot in recent years.Described above, we, which have gradually analyzed, prepares the poly- ammonia of ultra-soft matter
The main technical point of ester wet process bass, for the Synthetic Leather for making ultra-soft matter, a large amount of research work has been done by this seminar.
The polyurethane wet bass of ultra-soft matter prepared by the present invention has following points advantage compared with traditional polyurethane wet bass:
(1) softer compared to traditional Synthetic Leather feel, close to " no bony "；(2) there is high bass thickness；(3) have
There is regular foam structure；(4) peel strength with higher；(5) applied widely, market potential is huge.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the present invention prepares extra soft polyurethane wet process bass.
Specific embodiment
The present invention is described in further details with reference to embodiments.Production is not specified in agents useful for same or instrument and equipment
Manufacturer, it is accordingly to be regarded as the conventional products that can be bought by market.
The crystal property that the polyester polyol of high molecular weight possesses is smaller, when forming polyurethane long-chain molecule, hard section spacing
It is larger.H key active force between corresponding hard section is then smaller, thus reduces the hardness of synthetic leather.Polyester polyol compared to
Polyether polyol possesses higher tensile strength, is formed because the H key active force formed between ester group key is better than between ehter bond
H key active force.Therefore the polyester polyol of high molecular weight is selected, on the basis of keeping synthetic leather to have compared with softwood matter, again
It can peel strength with higher.The selection of chain extender has large effect to Synthetic Leather, and it is regular to possess height
Chain extender (such as EG, BDO and 1,6-HD.), crystal property is stronger, and the hardness of the Synthetic Leather of preparation is then bigger.Two
Ethylene glycol is then opposite with methyl propanediol.Ehter bond and pending methyl group, ehter bond phase are respectively present in diethylene glycol and methyl propanediol
There is weaker H key active force for ester bond, pending methyl group then has biggish steric hindrance, they can reduce resin
Between crystal property.By experimental results demonstrate diethylene glycol and methyl propanediol are simultaneously as chain extender in use, the two
Between synergistic effect, the crystal property of resin can be further decreased so that preparation synthetic leather possess more soft shape
State.
Preparation process used in the present invention is different from customary preparation methods to be allowed first under the premise of not adding solvent
Excessive MDI is reacted with polyalcohol, and the later period adds solvent and chain extender, and the polyurethane structural that the method is formed is interval
Soft hard segment structure is arranged between strand more regular.Since polyester has lipophilicity, the polyurethane of polyester type is prepared
Needing to add surfactant when wet process bass assists it to remove the DMF in bass.Anionic surfactant is capable of forming perpendicular
The foam structure (so that bass foaming is more complete) of shape, nonionic surfactant is able to suppress the solidification of wet process bass, has
Conducive to more fully removing solvent DMF therein.
In conclusion the present invention selects the polyester polyol PHA-6000 (1,6-HD and AA) of 6000 molecular weight, using two
Ethylene glycol is mixed with methyl propanediol prepares extra soft polyurethane using bismuth carboxylate as catalyst and two kinds of auxiliary agents as chain extender
Wet process bass.The polyurethane bottom wet process bass that such method obtains has feel, higher bass thickness and the removing of ultra-soft strong
Degree etc..
One, preparation process
PHA-6000 is weighed first in reaction unit, antioxidant, phosphoric acid and MDI (R value is set as 2) is added, and stirring is equal
It is even and be warming up to 50~60 DEG C of reaction 1h.DMF and chain extender diethylene glycol and methyl propanediol is added thereto again, is warming up to 70
DEG C reaction, and is added catalyst, to its thickening.Methanol and anionic surfactant are added when terminal and non-ionic surface is living
Property agent.Keep product viscosity when terminal between 25~300,000, solid content 30%.Continue to stir 1h after reaction, out
Material.
Embodiment 1:
In the four-hole boiling flask of 2000mL, PHA-6000,0.2g antioxidant BHT, the 0.03g H of 250g is added3PO4And
The MDI of 20.8g is stirred until homogeneous to be warming up at 50~60 DEG C and reacts 1h.500g DMF and 9.6g diethyl two is added thereto again
Alcohol.After being stirred until homogeneous, addition MDI (design R value is 1), which is warming up to 75~80 DEG C, makes its thickening reaction.It is added in reaction process
0.003g catalyst bismuth carboxylate improves activity, and adds suitable MDI and DMF.Methanol is added when reaction end to be terminated,
20g anionic surfactant and 20g nonionic surfactant are added after the completion of terminating.Viscosity is 25~30 after controlling terminal
Ten thousand, solid content 30%.
Embodiment 2:
In the four-hole boiling flask of 2000mL, PHA-6000,0.2g antioxidant BHT, the 0.03g H of 250g is added3PO4And
The MDI of 20.8g is stirred until homogeneous to be warming up at 50~60 DEG C and reacts 1h.500g DMF and 8.15g methyl-prop is added thereto again
Glycol.After being stirred until homogeneous, addition MDI (design R value is 1), which is warming up to 75~80 DEG C, makes its thickening reaction.Add in reaction process
Enter 0.003g catalyst bismuth carboxylate and improve activity, and adds suitable MDI and DMF.Methanol is added when reaction end to carry out eventually
Only, 20g anionic surfactant and 20g nonionic surfactant are added after the completion of terminating.Viscosity is 25 after controlling terminal
~30 ten thousand, solid content 30%.
Embodiment 3:
In the four-hole boiling flask of 2000mL, PHA-6000,0.2g antioxidant BHT, the 0.03g H of 250g is added3PO4And
The MDI of 20.8g is stirred until homogeneous to be warming up at 50~60 DEG C and reacts 1h.500g DMF, 4.8g diethylene glycol is added thereto again
With 4.1g methyl propanediol.After being stirred until homogeneous, addition MDI (design R value is 1), which is warming up to 75~80 DEG C, makes its thickening reaction.
0.003g catalyst bismuth carboxylate is added in reaction process and improves activity, and adds suitable MDI and DMF.Add when reaction end
Enter methanol to be terminated, 20g anionic surfactant and 20g nonionic surfactant is added after the completion of terminating.Control is eventually
Viscosity is 25~300,000 after point, solid content 30%.
Embodiment 4:
In the four-hole boiling flask of 2000mL, be added PHA-6000,0.2g antioxidant BHT of 250g, 0.03g H3PO4 and
The MDI of 20.8g is stirred until homogeneous to be warming up at 50~60 DEG C and reacts 1h.500g DMF, 4.8g diethylene glycol is added thereto again
With 4.1g methyl propanediol.After being stirred until homogeneous, addition MDI (design R value is 1), which is warming up to 75~80 DEG C, makes its thickening reaction.
0.003g catalyst bismuth carboxylate is added in reaction process and improves activity, and adds suitable MDI and DMF.Add when reaction end
Enter methanol to be terminated, 10g anionic surfactant and 30g nonionic surfactant is added after the completion of terminating.Control is eventually
Viscosity is 25~300,000 after point, solid content 30%.
Embodiment 5:
In the four-hole boiling flask of 2000mL, PHA-6000,0.2g antioxidant BHT, the 0.03g H of 250g is added3PO4And
The MDI of 20.8g is stirred until homogeneous to be warming up at 50~60 DEG C and reacts 1h.500g DMF, 4.8g diethylene glycol is added thereto again
With 4.1g methyl propanediol.After being stirred until homogeneous, addition MDI (design R value is 1), which is warming up to 75~80 DEG C, makes its thickening reaction.
0.003g catalyst bismuth carboxylate is added in reaction process and improves activity, and adds suitable MDI and DMF.Add when reaction end
Enter methanol to be terminated, 30g anionic surfactant and 10g nonionic surfactant is added after the completion of terminating.Control is eventually
Viscosity is 25~300,000 after point, solid content 30%.
Two, result verification
Polyurethane wet bass is made in the polyurethane resin synthesized in above-described embodiment, specific preparation process is as follows: will
The resin of above-described embodiment synthesis takes 100g, 30g wood powder, 1g mill base and 120g DMF is added, and under the conditions of high speed dispersion
It stirs evenly stand-by.By the slurry coating of preparation in leather sample scrim surfaces (coating thickness 1.3mm), coagulating basin is being placed it in
Then 15min is washed.Drying can be prepared by polyurethane wet bass in 110 DEG C of baking ovens after the completion of washing.Preparation is completed
Polyurethane wet bass is tested as follows afterwards: (1) feel, (2) bass thickness, (3) peel strength and (4) foam structure.
Three, conclusion
By the feel, the bass thickness, removing that compare the extra soft polyurethane wet process bass prepared in above-mentioned 5 embodiments
Intensity and foam structure show that polyurethane bass has most soft feel and higher peel strength in embodiment 5.Compared to it
Polyurethane bottom material obtained, embodiment 5 possess more broad application prospect in his embodiment.Experimental results such as 1 institute of table
Show:
The comparison of 1 extra soft polyurethane wet process bass physical property of table
Protection content of the invention is not limited to above embodiments.Without departing from the spirit and scope of the invention, originally
Field technical staff it is conceivable that variation and advantage be all included in the present invention, and with the attached claims be protection
Range.
Claims (8)
1. a kind of preparation method of extra soft polyurethane wet process bass, which is characterized in that specific step is as follows:
Step 1, by polyalcohol and excessive MDI investment reaction unit, R value is set as 2, and 1 h is reacted at 50 ~ 60 DEG C；
Step 2, continue that solvent dimethylformamide and chain extender are added into reaction unit；
Step 3, it is stirring evenly and then adding into MDI, catalyst and dimethylformamide, it is made to carry out thickening reaction, R value is set as 1；
Step 4, methanol and anionic surfactant and nonionic surfactant are added when terminal, is glued after reaction will be terminated
Degree control is 25 ~ 300,000, solid content 30%.
2. the preparation method of extra soft polyurethane wet process bass according to claim 1, which is characterized in that the step 1
In, polyalcohol is high-molecular-weight poly ester polyol.
3. the preparation method of extra soft polyurethane wet process bass according to claim 2, which is characterized in that the macromolecule
Weight polyester polyalcohol is PHA-6000.
4. the preparation method of extra soft polyurethane wet process bass according to claim 1, which is characterized in that the step 2
In, chain extender is diethylene glycol and methyl propanediol.
5. the preparation method of extra soft polyurethane wet process bass according to claim 1, which is characterized in that the step 3
In, catalyst is bismuth carboxylate.
6. the preparation method of extra soft polyurethane wet process bass according to claim 1, which is characterized in that the step 1
In, antioxidant and phosphoric acid is also added.
7. the preparation method of extra soft polyurethane wet process bass according to claim 1, which is characterized in that the antioxidant
For BHT.
8. the extra soft polyurethane wet process bass that preparation method as claimed in claim 1 to 7 is prepared.
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| CN110423333A (en) * | 2019-07-05 | 2019-11-08 | 浙江旭川树脂有限公司 | A kind of soft cryobranding color-changing polyurethane resin and its preparation method and application |
| CN111087566A (en) * | 2019-09-29 | 2020-05-01 | 扬州工业职业技术学院 | Preparation method of polyester modified biomass hydrolysis-resistant high-peel-resistance PU wet resin |
| CN111269382A (en) * | 2020-01-20 | 2020-06-12 | 扬州工业职业技术学院 | Anti-curling low-solidification-rate PU resin and preparation method thereof |
| CN111269684A (en) * | 2020-03-31 | 2020-06-12 | 扬州工业职业技术学院 | PU adhesive for double-layer super-ciliated towel cloth and preparation method thereof |
| CN111363343A (en) * | 2020-03-31 | 2020-07-03 | 扬州工业职业技术学院 | Dry-process fabric resin for high-temperature-resistant protein PU leather and preparation method thereof |
| CN112029263A (en) * | 2020-08-24 | 2020-12-04 | 扬州工业职业技术学院 | Fireproof heat-insulation building material and preparation method thereof |
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| CN111363343A (en) * | 2020-03-31 | 2020-07-03 | 扬州工业职业技术学院 | Dry-process fabric resin for high-temperature-resistant protein PU leather and preparation method thereof |
| CN111269684B (en) * | 2020-03-31 | 2022-02-15 | 扬州工业职业技术学院 | PU adhesive for double-layer super-ciliated towel cloth and preparation method thereof |
| CN112029263A (en) * | 2020-08-24 | 2020-12-04 | 扬州工业职业技术学院 | Fireproof heat-insulation building material and preparation method thereof |
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