CN107540805A - A kind of process solvent and its application - Google Patents
A kind of process solvent and its application Download PDFInfo
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- CN107540805A CN107540805A CN201710796116.4A CN201710796116A CN107540805A CN 107540805 A CN107540805 A CN 107540805A CN 201710796116 A CN201710796116 A CN 201710796116A CN 107540805 A CN107540805 A CN 107540805A
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- solvent
- slurry
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- polyurethane resin
- leather
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Abstract
The present invention relates to a kind of process solvent, include the composition of following mass percent：Dimethylformamide (93~95) %；Sulfoxide type organic (5~7) %, the mixed solvent are used for the production of leather polyurethane resin.Compared with prior art, mixed solvent of the invention, in Synthetic Leather production, offer reaction environment is served, regulation slurry is sticky, carries the effect of slurry.The mixed solvent reduces the use of raw material in production process, reduces cost；Flash-point is improved, improves the security of production process；Make between slurry and base fabric combine it is even closer, improve product quality.
Description
Technical field
The present invention relates to polyurethane production field, and in particular to a kind of process solvent and its application.
Background technology
(N, N-Dimethylformamide, abbreviation DMF, hereinafter using referred to as, molecular structure is simple for dimethylformamide
Formula O=CHN (CH3)2) because its molecular weight is small, dielectric constant is high, has electronq donor characteristic and forms the ability of complex compound,
It is difficult to volatilize under normal temperature, physical property is stable with chemical property, has very strong solvability, is described as " alembroth ", existing
Play the role of Synthetic Leather production process generally played in the form of process solvent it is irreplaceable.
But DMF solvent has the problem of to be solved in actual production there are still some.DMF nucleophilicities are not strong enough, poly- ammonia
During ester resin polymerization so that the activity as the isocyanates of main material is not strong enough, can not react completely in proportion, therefore
Need to be excessively added as the butanediol of chain extender and the PEPA of one of raw material, add the life of leather polyurethane resin
Produce cost.
Secondly, DMF flash-points are relatively low (58 DEG C), have certain danger in storage and transport process is produced.
Again, because the DMF solvent polarity as slurry carried solvent is inadequate in wet polyurethane synthetic leather production process
By force, as defective tightness is combined between oil phase carrier and aqueous phase, abscess is easily formed, influences final product quality.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of activity is big, production peace
Full process solvent and its application.
The purpose of the present invention can be achieved through the following technical solutions：A kind of process solvent, the process solvent include with
The composition of lower mass percent：
Dimethylformamide (93~95) %；
Sulfoxide type organic (5~7) %.
Described sulfoxide type organic includes one kind in dimethyl sulfoxide (DMSO), diethyl sulfoxide or benzyl benzene sulfoxide.
Described sulfoxide type organic is dimethyl sulfoxide (DMSO).Dimethyl sulfoxide (DMSO), i.e. DMSO, it is same with DMF that there is molecular weight
It is small, dielectric constant is high, is difficult to volatilize at normal temperatures, the characteristics of physical property and chemical property are stable.Compared with DMF, DMSO's
Viscosity is higher, boiling point is higher, flash-point is higher, nucleophilicity is stronger, polarity is also stronger.DMSO flash-points are 95 DEG C, and DMF flash-points are 58
DEG C, the two mixture calculates according to Raoult laws and Le Chatelier equations, and flash-point is 62.8 DEG C.Use the DMF-
The polyurethane resin of DMSO mixed solvents production is through flash(ing) test of remaining silent, and flash-point is 64 DEG C, the poly- ammonia relatively produced using DMF solvent
58 DEG C of ester resin flash-point has raised, and reduces the danger in whole production, storage and transport process.
A kind of application of process solvent as described above, the solvent are used for the production of leather polyurethane resin.
Preferably, described solvent is used for the polymerization process of leather polyurethane resin, and the solvent is polyalcohol, fourth two
Alcohol, isocyanates provide reactive polymeric environment.DMSO nucleophilicities are much larger than DMF, and the isocyanate-reactive of in the mixed solvent is compared with DMF
After isocyanates in solvent is coordinated by DMSO, activity is bigger, for the butanediol and PEPA for reaction is added completely
Amount can suitably reduce.
Preferably, described solvent is used for the viscosity control process of leather polyurethane resin, the solvent and isocyanates
The sliminess of common adjustment resin.DMSO nucleophilicities are much larger than DMF, and the isocyanate-reactive of in the mixed solvent is compared with DMF solvent
In isocyanates be coordinated by DMSO after, activity it is bigger, adjust the better of sliminess.
Preferably, described solvent is used for dry method leather Polyurethane resin slurry production technology, and the solvent is as dilution
Agent；Or sliminess of the solvent for adjusting finished product slurry.DMSO polarity is strong, in the production of wet polyurethane synthetic leather,
DMF-DMSO mixed solvents are even closer as being combined between oil phase carrier and aqueous phase, and slurry attachment is close, is not easy to form abscess.
Preferably, the solvent stated is used for wet method leather Polyurethane resin slurry production technology, and the solvent is as diluent；
Or sliminess of the solvent for adjusting finished product slurry.DMSO polarity is strong, in the production of wet polyurethane synthetic leather, DMF-
DMSO mixed solvents are even closer as being combined between oil phase carrier and aqueous phase, and slurry attachment is close, is not easy to form abscess.
Preferably, described solvent is used for dry-process polyurethane synthetic leather production technology, and the solvent is as polyurethane resin
Slurry carried solvent.DMSO polarity is strong, in the production of wet polyurethane synthetic leather, DMF-DMSO mixed solvents as oil phase carrier and
Combine even closer between aqueous phase, slurry attachment is close, is not easy to form abscess.
Preferably, described solvent is used for wet polyurethane synthetic leather production technology, and the solvent is as polyurethane resin
Slurry carried solvent.DMSO polarity is strong, in the production of wet polyurethane synthetic leather, DMF-DMSO mixed solvents as oil phase carrier and
Combine even closer between aqueous phase, slurry attachment is close, is not easy to form abscess.
Compared with prior art, beneficial effects of the present invention are embodied in following several respects：
(1) mixed solvent of the invention is due to the addition of DMSO, and DMSO nucleophilicities are much larger than DMF, in the mixed solvent
After isocyanate-reactive is coordinated compared with the isocyanates in DMF solvent by DMSO, activity is bigger, for the fourth for making reaction be added completely
The amount of glycol and PEPA can be reduced suitably；
(2) for polyurethane resin of the mixed solvent through production of the invention through flash(ing) test of remaining silent, flash-point is 64 DEG C, is relatively used
58 DEG C of the polyurethane resin flash-point of DMF solvent production has raised, and reduces the danger in whole production, storage and transport process；
(3) mixed solvent of the present invention is even closer as being combined between oil phase carrier and aqueous phase, and slurry attachment is close, is not easy
Form abscess.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
Leather uses polyurethane resin production technology：PEPA, butanediol, DMF-DMSO mixed solvents etc. are measured respectively
After put into reactor, wherein, the mass fraction that DMF mass fraction is 93%, DMSO is 7%, is stirred, formula ratio control
Alcohol is excessive, to ensure that isocyanates reacts completely；The isocyanates of formula ratio is added to reactor, leads to steam from reacting kettle jacketing
Heating, stirring heating carry out bunching reaction, and reaction stops heating after starting, to the logical circulation water management temperature of chuck at 75~80 DEG C
Left and right；Auxiliary agent is added to reactor again, carries out chain-extension polymerization reaction, the reaction time is controlled in 3~5h；Inspection by sampling is simultaneously added
DMF-DMSO mixed solvents or isocyanates carry out viscosity adjustment, wet method PU resins mixed solvent containing DMF-DMSO about 70%；Take
Sample after the assay was approved, continues to be passed through cooling water being cooled down, finally discharging packaging to reacting kettle jacketing.
As a result show, replace former solvent by using mixed solvent, the usage amount of butanediol reduces by 8% left side than before
The right side, save cost.
Embodiment 2
Dry method leather uses Polyurethane resin slurry production technology：By leather polyurethane resin, DMF-DMSO mixed solvents, fourth
Ketone, acetone, mill base, auxiliary agent etc. measure according to the ratio of formula ratio above-mentioned substance putting into reactor, wherein DMF mass fraction
It is 6% for 94%, DMSO mass fraction, is stirred；Reacting kettle jacketing leads to steam and is heated to 55~70 DEG C or so；Stirring point
After dissipating uniformly, viscosity, sampling detection are adjusted with DMF-DMSO mixed solvents；After the assay was approved, filter, dispense.
As a result show, replace former solvent by using mixed solvent, the sticky regulating time of leather polyurethane resin is than it
It is preceding to save 10% or so and better.
Embodiment 3
Wet method leather uses Polyurethane resin slurry production technology：By leather polyurethane resin, DMF-DMSO mixed solvents, color
Slurry, auxiliary agent etc. measure according to the ratio of formula ratio above-mentioned substance putting into reactor, wherein, DMF mass fraction is 94%,
DMSO mass fraction is 6%, is stirred；Reacting kettle jacketing leads to steam and is heated to 55~70 DEG C or so；It is dispersed with stirring uniformly
Afterwards, viscosity, sampling detection are adjusted with DMF-DMSO mixed solvents；After the assay was approved, filter, dispense.
As a result show, replace former solvent by using mixed solvent, the sticky regulating time of leather polyurethane resin is than it
It is preceding to save 8% or so and better.
Embodiment 4
Dry-process polyurethane synthetic leather production technology：Using release liners as carrier, smearing is mixed with DMF-DMSO and mixed in release liners
The dry method leather slurry of bonding solvent, the mass fraction that DMF mass fraction is 95%, DMSO is 5%, is dried through heated-air drying；
Again to coating slurry on epidermis after cooling, then dry；To coating leather slurry on epidermis after cooling；To the epidermis of film forming
Upper coating mixed solution of adhesive layer, pasted with wet method chamois leather, extruding is batched after drying；Batch rear product curing 72h；Peel off again release
Paper, the product after stripping carry out the post processings such as mill skin, glazing, embossing finishing by purposes requirement.
As a result show, replace former solvent by using mixed solvent, slurry attachment is even closer in production process, and is not easy
Form abscess.
Embodiment 5
Wet polyurethane synthetic leather production technology：Base fabric after washing, shape, dry, be sent into by polyurethane resin and
The wet method leather of DMF-DMSO mixed solvents is impregnated with pulp solution, and the mass fraction that DMF mass fraction is 95%, DMSO is
5%, make to be full of leather slurry and DMF-DMSO mixed solvents in base fabric；Then it is sent into coacervation groove and solidified, solidifying
Gu during, DMF-DMSO mixed solvents are replaced by water in slurry, air-setting, and setting time is about 5 minutes；Coacervation is later
Base fabric is sent into rinsing bowl and washed, and enters water-filling flushing, removing residual DMF-DMSO mixed solvents to epithelium abscess repeatedly；And then
Extrude moisture content, drying epithelium the product of wet method half；The product of wet method half carries out the post processing finishing such as mill skin, glazing or embossing again
Work.
As a result show, replace former solvent by using mixed solvent, slurry attachment is even closer in production process, and is not easy
Form abscess.
Claims (10)
1. a kind of process solvent, it is characterised in that the process solvent includes the composition of following mass percent：
Dimethylformamide (93~95) %；
Sulfoxide type organic (5~7) %.
2. a kind of process solvent according to claim 1, it is characterised in that described sulfoxide type organic includes dimethyl
One kind in sulfoxide, diethyl sulfoxide or benzyl benzene sulfoxide.
3. a kind of process solvent according to claim 2, it is characterised in that described sulfoxide type organic is that dimethyl is sub-
Sulfone.
4. a kind of application of the process solvent as described in claims 1 to 3 is any, it is characterised in that the solvent is used to remove from office with poly- ammonia
The production of ester resin.
5. the application of a kind of process solvent according to claim 4, it is characterised in that described solvent is used to remove from office with poly- ammonia
The polymerization process of ester resin, the solvent is polyalcohol, butanediol, isocyanates provide reactive polymeric environment.
6. the application of a kind of process solvent according to claim 4, it is characterised in that described solvent is used to remove from office with poly- ammonia
The viscosity control process of ester resin, the solvent adjust the sliminess of resin with isocyanates jointly.
7. the application of a kind of process solvent according to claim 4, it is characterised in that described solvent is used for dry method leather and used
Polyurethane resin slurry production technology, the solvent is as diluent；Or the solvent is used to adjust the sticky of finished product slurry
Degree.
8. the application of a kind of process solvent according to claim 4, it is characterised in that described solvent is used for wet method leather and used
Polyurethane resin slurry production technology, the solvent is as diluent；Or the solvent is used to adjust the sticky of finished product slurry
Degree.
9. the application of a kind of process solvent according to claim 4, it is characterised in that described solvent is used for the poly- ammonia of dry method
Lipase absobed removes from office production technology, and the solvent carries solvent as Polyurethane resin slurry.
10. the application of a kind of process solvent according to claim 4, it is characterised in that described solvent gathers for wet method
Urethane synthetic leather production technology, the solvent carry solvent as Polyurethane resin slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710796116.4A CN107540805A (en) | 2017-09-06 | 2017-09-06 | A kind of process solvent and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710796116.4A CN107540805A (en) | 2017-09-06 | 2017-09-06 | A kind of process solvent and its application |
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| Publication Number | Publication Date |
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| CN107540805A true CN107540805A (en) | 2018-01-05 |
Family
ID=60959297
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| CN201710796116.4A Pending CN107540805A (en) | 2017-09-06 | 2017-09-06 | A kind of process solvent and its application |
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