CN106833574A - A kind of water-soluble diversion agent and preparation method thereof - Google Patents
A kind of water-soluble diversion agent and preparation method thereof Download PDFInfo
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- C09K8/506—Compositions based on water or polar solvents containing organic compounds
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Abstract
The present invention relates to the fracture stimulation operations in oil extraction process and oil recovery technology of reservoir sweep field, and in particular to a kind of water-soluble diversion agent and preparation method thereof.Water-soluble diversion agent preparing raw material includes 50~100 parts of straight chain branched polylactide, 5~20 parts of plasticizer, 3~8 parts of nanoreinforcement material, 0.1~0.3 part of antioxidant, 0.5~1 part of lubricant.The preparation method of the water-soluble diversion agent is：Straight chain poly phosphazene and polylactide are synthesized first, straight chain branched polylactide can be obtained；Then straight chain branched polylactide, plasticizer, nanoreinforcement material, antioxidant, lubricant are kneaded in banbury in proportion uniform, then by extruding pelletization in double screw extruder, through extruding tie rod after extruded machine extrusion, water-cooled, air-dry, granulate and crush, the water-soluble diversion agent of different-grain diameter is prepared after screening.The water-soluble diversion agent can preferably be dissolved in water, and be degraded in water；With bearing strength higher, can more than pressure-bearing 30MPa.
Description
Technical field
The present invention relates to the fracture stimulation operations in oil extraction process and oil recovery technology of reservoir sweep field, and in particular to a kind of
Water-soluble diversion agent and preparation method thereof.
Background technology
Pressure break diversion agent is a kind of auxiliary additive in oil-water well transformation process, is called pressure break diverting agent, and it is to turn to
Important part in fracturing technique.In pressing crack construction, temporarily block up old seam using the bridge blinding effect of diversion agent or added sand to stitch,
Winding shaft bottom net pressure, makes fluid turn in the earth formation, and formation is different from the new crack of old fractuer direction or makes fracturing sand
It is uniformly distributed in crack, so as to open new fluid flowing passage in reservoir, more broadly links up old crack and do not employ
Oil-gas Layer, increase oil and gas production.The diversion agent for using at present mainly has：Silicic acid salt grain, haydite, polyacrylamide etc., silicic acid
There is density greatly in salt grain, haydite, pumping is extremely difficult, and efficiency is low, insoluble；It is low scarce to there is closure pressure in polyacrylamide
Fall into.Therefore my company develops that intensity is higher, and solution temperature and speed are controllable, dissolving thoroughly water-soluble diversion agent.
The content of the invention
Present invention seek to address that above mentioned problem, there is provided a kind of water-soluble diversion agent and preparation method thereof, it has intensity high,
Solution temperature and speed are controllable, dissolve it is thorough the features such as.The present invention is achieved through the following technical solutions：
A kind of water-soluble diversion agent, is made up of the raw material of weight portion as shown below：
| Material name | Component |
| Straight chain branched polylactide | 50~100 parts |
| Plasticizer | 5-20 parts |
| Nanoreinforcement material | 3-8 parts |
| Antioxidant | 0.1-0.3 parts |
| Lubricant | 0.5-1 parts |
Straight chain branched polylactide is the highly -branched degree polymer being polymerized by straight chain poly phosphazene and polylactide, preferably
Five branched polylactides.Straight chain poly phosphazene is the straight chain phosphine nitrile of the molecular weight that is polymerized by dichloro phosphine nitrile in 200-5000, excellent
Select pentachloro- phosphine nitrile.The reaction equation of straight chain poly phosphazene and polylactide polymerisation is
Straight chain branched polylactide is prepared from by following methods：
1) phosphine nitrile five is etherified the synthesis of benzaldehyde
In a kettle. add 10~20 parts of parahydroxyben-zaldehyde, 100 parts of solvent, after stirring and dissolving, lower point of nitrogen atmosphere
Criticize and add 5~30 parts of catalyst, keep 0 DEG C of temperature in kettle, -5 DEG C are down to again after continuation reaction being warmed to room temperature after adding 2 hours.By 3
~10 parts of pentachloro- phosphine nitriles are dissolved in 17 parts of solvents, are warmed to room temperature after being slowly added dropwise in reactor in 1.5 hours at -5 DEG C
And stirring reaction 16 hours.
Pentachloro- phosphine nitrile CAS：13966-08-0, English name：(Dichlorophosphinyl)phosphorimidic
Trichloride, molecular weight is 269.22.
Reaction terminate after by reacting liquid filtering, and with 50 parts of solvents drip washing filter cake in three times, merging filtrate, rotation volatilization is removed
The etherificate benzaldehyde of pale yellow crystals intermediate product phosphine nitrile five is recrystallized to obtain with normal heptane or absolute ethyl alcohol after removing solvent, it is stand-by.
2) phosphine nitrile five is etherified the synthesis of phenmethylol
3~7 parts of reducing agents are dissolved in 20~40 parts of solvent, 2~5 parts of compatilizers are added, stirred stand-by；By 25
~30 parts of etherificate benzaldehydes of phosphine nitrile five are dissolved in 100 parts of solvents, in the reductant solution for preparing slowly is added dropwise at 0 DEG C,
And it is warmed to room temperature continuation reaction 1 hour.Reaction to aldehyde radical is tracked by gas-chromatography to convert completely.Reaction adds 2~4 after terminating
Part terminator is simultaneously stirred 12 hours.
Persistently stirring removes solvent to thick after 12 hours using rotation volatilization, to 100~400 parts of addition in residue
Extractant extracts intermediate product B, and stirring adds 10 parts of desiccant dryness after 2 hours.Filter and be spin-dried for filtrate and obtain middle product
Thing phosphine nitrile five is etherified phenmethylol, stand-by.
3) synthesis of straight chain branched polylactide
2~2.5 parts of phosphine nitriles five are etherified phenmethylol, 0.005~0.007 part of initiator, 100 parts of lactides add 5L high pressures
In kettle, can also add and 0~50 part of auxiliary diluent, 180 DEG C are warming up to after being stirred 2 hours at 120 DEG C and continues to react 5 hours
Obtain off-white powder product straight chain branched polylactide.
The catalyst is one or more in triethylamine, triisopropylamine, potassium carbonate and sodium hydride；
And/or, the solvent be anhydrous THF or anhydrous propanone in one or more；
And/or, the preferred sodium borohydride of reducing agent；
And/or, the ammonium chloride solution of the terminator preferably 5% concentration；
And/or, it is described auxiliary diluent be toluene, dimethylbenzene in one or two；
And/or, the preferred dichloromethane of extractant；
And/or, the preferred anhydrous sodium sulfate of drier；
And/or, the initiator preferably octanoic acid stannous；
And/or, the auxiliary diluent is one or more in toluene, dimethylbenzene；
And/or, the plasticizer is the one kind or several in poly-hydroxy fatty acid, PEG, PTMC PTMC
Kind；
And/or, the nanoreinforcement material be one kind in nano-calcium carbonate, Nano carbon white, nanoscale talcum powder or
It is several；
And/or, the antioxidant is antioxidant 1010, antioxidant 1076, antioxidant 164, antioxidant 264, antioxidant CA
In one or more；
The lubricant is one or more in stearic acid, tristerin, paraffin, OPE waxes, silicone oil；
A kind of preparation method of water-soluble diversion agent, comprises the steps of：
1) by straight chain branched polylactide, plasticizer, nanoreinforcement material, antioxidant, lubricant in proportion in banbury
Middle mixing is uniform, and banbury temperature control is controlled in 90~120 DEG C or so, 8~10min of mixing time.
2) and then by extruding pelletization in double screw extruder, extrusion temperature is 90~100 DEG C of an area, two area~tetra- areas
110~125 DEG C, five 105~120 DEG C of area~ten areas, 11 area's temperature are 110 DEG C.Through extruding tie rod, water after extruded machine extrusion
It is cold, air-dry, granulate and crush, water-soluble diversion agent is prepared after screening.
Water-soluble diversion agent prepared by the present invention has following features：1. have bearing strength higher, can pressure-bearing 30MPa with
On；2. solution temperature and dissolution time are adjustable；3. dissolve thorough, without insoluble resin particle；4. diversion agent grain diameter can lead to
Broken milling process control is crossed, different pressure break scale requirements can be met.
Specific embodiment
Following part is that the present invention will be further described for specific embodiment, but implementation below is only to this hair
Bright is explained further, and the scope of the present invention is not represented and is only limitted to this, every equivalence replacement done with thinking of the invention,
In protection scope of the present invention, it is only used for explaining the present invention, and is not considered as limiting the invention.
Embodiment 1
1) phosphine nitrile five is etherified the synthesis of benzaldehyde
Parahydroxyben-zaldehyde 610g, anhydrous THF 3L are added in a kettle., after stirring and dissolving, are added in batches under nitrogen atmosphere
Enter sodium hydride 200g (60%), keep 0 DEG C of temperature in the kettle, be warmed to room temperature after adding after continuation is reacted 2 hours and be down to -5 DEG C again.Five
Chlorine phosphine nitrile 269g is dissolved in the anhydrous THF of 500mL, is warmed to room temperature simultaneously after being slowly added dropwise in reactor in 1.5 hours at -5 DEG C
Stirring reaction 16 hours.
Reaction terminate after by reacting liquid filtering and with the anhydrous THF of 1L drip washing filter cakes in three times, merging filtrate, rotation volatilization is removed
Pale yellow crystals 648g is recrystallized to obtain with normal heptane or absolute ethyl alcohol after removing solvent, is the etherificate benzaldehyde of phosphine nitrile five, yield 93%.
2) phosphine nitrile five is etherified the synthesis of phenmethylol
Sodium borohydride 19g is dissolved in 200mLTHF and 10mL alcohol mixeding liquids, obtains sodium borohydride solution, the etherificate benzene of phosphine nitrile five
Formaldehyde 139.4g is dissolved in 500mL THF, in be slowly added dropwise at 0 DEG C gained sodium borohydride solution in and be warmed to room temperature continuation react
1 hour.GC tracking reaction to aldehyde radical is converted completely.
Reaction adds 20 milliliters of 5% ammonium chloride solution and stirs 12 hours after terminating.
Persistently stirring removes solvent to thick after 12 hours using rotation volatilization, to addition 2L dichloromethanes in residue
Alkane, stirring adds anhydrous sodium sulfate drying after 2 hours.Filter and be spin-dried for filtrate and obtain dope 139g, be the etherificate benzene first of phosphine nitrile five
Alcohol, yield 98.3%.
3) synthesis of straight chain branched polylactide：
Phosphine nitrile five is etherified phenmethylol 70.7g, stannous octoate 0.2g, lactide 3000g, add in 5L autoclaves 120 DEG C it is anti-
180 DEG C are warming up to after answering 2 hours to continue to react 5 hours to obtain off-white powder 3048g, are straight chain branched polylactide, yield
99.3%.
Gained straight chain branched polylactide is five branched polylactides, is detected through GPC：
Mn：22890, Mw/Mn=1.17, Mp：129 DEG C, crystallinity：20.6%.
4) preparation of Water soluble diversion agent
79.2 parts of five branched polylactide, 10 parts of PEG400,10 parts of nano-calcium carbonate, 0.2 part of antioxidant 1010 are resisted
264 0.1 parts of oxygen agent, 0.5 part of calcium stearate is put into banbury, banburying 8 minutes at 110 DEG C.Then the good masterbatch of banburying is added
Enter extruding pelletization in double screw extruder, extrusion temperature is 100 DEG C of an area, two 120 DEG C of area~tetra- areas, five 110 DEG C of area~ten areas,
11 110 DEG C of area's temperature.Through extruding tie rod after extruded machine extrusion, water-cooled is air-dried, and granulation obtains well mixed plastic pellet
Son is Water soluble diversion agent.
Embodiment 2
1) phosphine nitrile five is etherified the synthesis of benzaldehyde
Parahydroxyben-zaldehyde 610g, triethylamine 606g, anhydrous THF 3L, after stirring and dissolving, nitrogen are added in a kettle.
Sodium hydride 200g (60%) is dividedly in some parts under atmosphere, 0 DEG C of temperature in the kettle is kept, after continuation reaction being warmed to room temperature after adding 2 hours
- 5 DEG C are down to again.Pentachloro- phosphine nitrile 269g is dissolved in the anhydrous THF of 500mL, at -5 DEG C in slowly reactor is added dropwise in 1.5 hours
After be warmed to room temperature and stirring reaction 16 hours.
Reaction terminate after by reacting liquid filtering and with the anhydrous THF of 1L drip washing filter cakes in three times, merging filtrate, rotation volatilization is removed
Pale yellow crystals 664g is recrystallized to obtain with normal heptane or absolute ethyl alcohol after removing solvent, is the etherificate benzaldehyde of phosphine nitrile five, yield
95.2%.HNMR(400M,d6-DMSO)：7.04ppm(d,2H),7.78ppm(d,2H),9.93ppm(s,1H).
2) phosphine nitrile five is etherified the synthesis of phenmethylol
Sodium borohydride 38g is dissolved in 200mLTHF and 50mL alcohol mixeding liquids, obtains sodium borohydride solution, the etherificate benzene of phosphine nitrile five
Formaldehyde 278g is dissolved in 1000mL THF in gained sodium borohydride solution is slowly added dropwise at 0 DEG C and is warmed to room temperature continuation and reacts 1
Hour.GC tracking reaction to aldehyde radical is converted completely.
Reaction adds 20 milliliters of 5% ammonium chloride solution and stirs 12 hours after terminating.
Persistently stirring removes solvent to thick after 12 hours using rotation volatilization, to addition 1.2L dichloromethanes in residue
Alkane, stirring adds anhydrous sodium sulfate drying after 2 hours.Filter and be spin-dried for filtrate and obtain dope 282g, be the etherificate benzene first of phosphine nitrile five
Alcohol, yield 100%.
3) synthesis of straight chain branched polylactide：
Phosphine nitrile five is etherified phenmethylol 48g, and stannous octoate 0.1g, lactide 2000g, toluene 1000mL is added in 5L autoclaves
120 DEG C of reactions are warming up to 180 DEG C and continue solvent is evaporated off to obtain off-white powder 2048g after reacting 5 hours after 2 hours, are straight chain branch
Change polylactide, yield 100%.
Gained straight chain branched polylactide is five branched polylactides, is detected through GPC：
Mn：24860, Mw/Mn=1.21, Mp：138 DEG C, crystallinity：21.3%.
4) preparation of Water soluble diversion agent
By 76 parts of five branched polylactide, 15 parts of polyhydroxyalkanoate, 8 parts of Nano carbon white, antioxidant 1010 0.2
Part, 164 0.1 parts of antioxidant, 0.7 part of OPE waxes are put into banbury, banburying 8 minutes at 120 DEG C.Then by masterbatch that banburying is good
Extruding pelletization in double screw extruder is added, extrusion temperature is 90 DEG C of an area, two 115 DEG C of area~tetra- areas, five area~ten areas 115
DEG C, 11 110 DEG C of area's temperature.Through extruding tie rod after extruded machine extrusion, water-cooled is air-dried, and granulation obtains well mixed plastics
Particle.
Embodiment 3
1) phosphine nitrile five is etherified the synthesis of benzaldehyde
Parahydroxyben-zaldehyde 305g, potassium carbonate 379.5g, anhydrous propanone 3L, after stirring and dissolving, nitrogen are added in a kettle.
Atmosphere is dividedly in some parts sodium hydride 200g (60%) under enclosing, keep 0 DEG C of temperature in the kettle, continuation is warmed to room temperature after adding and is reacted 2 hours
It is down to -5 DEG C again afterwards.Pentachloro- phosphine nitrile 134.5g is dissolved in 500mL anhydrous propanones, anti-in being slowly added dropwise in 1.5 hours at -5 DEG C
It is warmed to room temperature after answering in kettle and stirring reaction 16 hours.
Reaction terminate after by reacting liquid filtering and with 0.5L anhydrous propanones drip washing filter cake in three times, merging filtrate, rotation is waved
Normal heptane/absolute ethyl alcohol recrystallizes to obtain pale yellow crystals 342g after hair removes solvent, is the etherificate benzaldehyde of phosphine nitrile five, yield
98.1%.
2) phosphine nitrile five is etherified the synthesis of phenmethylol
Sodium borohydride 38g is dissolved in 200mLTHF and 50mL methyl alcohol mixed liquors, and the etherificate of phosphine nitrile five benzaldehyde 278g is dissolved in
1000mL THF in be slowly added dropwise at 0 DEG C gained sodium borohydride solution in and be warmed to room temperature continuation react 1 hour.GC tracking is anti-
Should completely be converted to aldehyde radical.
Reaction adds 20 milliliters of 5% ammonium chloride solution and stirs 12 hours after terminating.
Persistently stirring removes solvent to thick after 12 hours using rotation volatilization, to addition 1L dichloromethanes in residue
Alkane, stirring adds anhydrous sodium sulfate drying after 2 hours.Filter and be spin-dried for filtrate and obtain dope 282g, be the etherificate benzene first of phosphine nitrile five
Alcohol, yield 100%.
3) synthesis of straight chain branched polylactide
Phosphine nitrile five is etherified phenmethylol 48g, and stannous octoate 0.1g, lactide 2000g, dimethylbenzene 500mL adds 5L autoclaves
In 120 DEG C 180 DEG C be warming up to after 2 hours continue solvent is evaporated off after reacting 5 hours to obtain off-white powder 2048g, be branched straight chain
Polylactide, yield 100%.
Gained straight chain branched polylactide is five branched polylactides, is detected through GPC：
Mn：21495, Mw/Mn=1.32, Mp：126 DEG C, crystallinity：19.8%.
4) preparation of Water soluble diversion agent
By 64 parts of five branched polylactide, 20 parts of PEG400,15 parts of nanomete talc powder, 0.3 part of antioxidant CA, paraffin 0.7
Part is put into banbury, banburying 8 minutes at 100 DEG C.Then by extruding pelletization in the good masterbatch addition double screw extruder of banburying,
Extrusion temperature is 100 DEG C of an area, two 110 DEG C of area~tetra- areas, five 120 DEG C of area~ten areas, 11 110 DEG C of area's temperature.Extruded machine
Through extruding tie rod after extrusion, water-cooled is air-dried, and granulation obtains well mixed plastic pellet, is Water soluble diversion agent.
Embodiment 4
1) phosphine nitrile five is etherified the synthesis of benzaldehyde
Parahydroxyben-zaldehyde 610g, triisopropylamine 786.5g, anhydrous THF 3L, stirring and dissolving are added in a kettle.
Afterwards, sodium hydride 200g (60%) is dividedly in some parts under nitrogen atmosphere, 0 DEG C of temperature in the kettle is kept, continuation is warmed to room temperature after adding and is reacted 2
- 5 DEG C are down to again after hour.Pentachloro- phosphine nitrile 250g is dissolved in the anhydrous THF of 500mL, anti-in being slowly added dropwise in 1.5 hours at -5 DEG C
It is warmed to room temperature after answering in kettle and stirring reaction 16 hours.
Reaction terminate after by reacting liquid filtering and with the anhydrous THF of 1L drip washing filter cakes in three times, merging filtrate, rotation volatilization is removed
Pale yellow crystals 639g is recrystallized to obtain with normal heptane or absolute ethyl alcohol after removing solvent, is straight chain phosphine nitrile ether benzaldehyde.
2) phosphine nitrile five is etherified the synthesis of phenmethylol
Sodium borohydride 30g is dissolved in 200mLTHF and 10mL alcohol mixeding liquids, and poly phosphazene etherificate benzaldehyde 130g is dissolved in 500mL
THF in be slowly added dropwise at 0 DEG C gained sodium borohydride solution in and be warmed to room temperature continuation react 1 hour.GC tracking is reacted to aldehyde
Base is converted completely.
Reaction adds 20 milliliters of 5% ammonium chloride solution and stirs 12 hours after terminating.
Persistently stirring removes solvent to thick after 12 hours using rotation volatilization, to addition 2L dichloromethanes in residue
Alkane, stirring adds anhydrous sodium sulfate drying after 2 hours.Filter and be spin-dried for filtrate and obtain dope 130g, be the etherificate benzene first of phosphine nitrile five
Alcohol, yield 99.1%.
3) synthesis of straight chain branched polylactide
Poly phosphazene is etherified phenmethylol 70g, 120 DEG C 2 hours in stannous octoate 0.2g, lactide 3000g addition 5L autoclaves
After be warming up to 180 DEG C continue react 5 hours off-white powder 3020g, be straight chain branched polylactide, yield 98.3%.
The straight chain branched polylactide is five branched polylactides, is detected through GPC：
Mn：19730, Mw/Mn=1.52, Mp：142 DEG C, crystallinity：26.3%.
4) preparation of Water soluble diversion agent
By 89 parts of five branched polylactide, 5 parts of PTMC PTMC, 5 parts of nano-corundum, antioxidant CA 0.3
Part, 0.7 part of silicone oil is put into banbury, banburying 8 minutes at 110 DEG C.Then the good masterbatch of banburying is added into double screw extruder
Middle extruding pelletization, extrusion temperature is 100 DEG C of an area, two 110 DEG C of area~tetra- areas, five 115 DEG C of area~ten areas, 11 area's temperature 110
℃.Through extruding tie rod after extruded machine extrusion, water-cooled is air-dried, and granulation obtains well mixed plastic pellet, is water-soluble turning
To agent.
In order to check a kind of actual performance of water-soluble diversion agent of the present invention, in addition it is also necessary to which granular water-soluble diversion agent is put into
In a diameter of 8cm cylindrical shapes punching block, punching block has water filling port and delivery port up and down, carries out soluble test and bearing capacity test：
Rock core is put into punching block first, injects water, sealing frock is warming up to test temperature, is gradually forced into delivery port
Outflow water, records water flow；
Then the embodiment water-soluble diversion agent of gained is put into punching block on rock core again, water is injected in pavement thickness 2cm, compacting,
Sealing frock, is warming up to test temperature, is gradually forced into delivery port outflow water, records delivery port after breakthrough pressure, and breakthrough
Water flow；Temporarily stifled rate is calculated by formula (1).
(water flow after rock core water flow-breakthrough)/rock core water flow × 100%=temporarily blocks up rate (1)
In the case where keeping pressure and solution temperature constant, when temporary stifled rate is reduced to 0, show that diversion agent is completely molten
Solution, record is completely dissolved the time.
The water-soluble diversion agent pressure of table 1, dissolving statistical form
The present invention is described by way of example above, but the invention is not restricted to above-mentioned specific embodiment, it is all to be based on
Any change or modification that the present invention is done belong to the scope of protection of present invention.
Claims (10)
1. a kind of water-soluble diversion agent, it is characterised in that be prepared by following parts by weight of component：
2. water-soluble diversion agent as claimed in claim 1, it is characterised in that the straight chain branched polylactide is five branched poly- third
Lactide.
3. water-soluble diversion agent as claimed in claim 1, it is characterised in that the straight chain branched polylactide is by the poly- phosphine of straight chain
Nitrile and polylactide are polymerized.
4. water-soluble diversion agent as claimed in claim 3, it is characterised in that the straight chain poly phosphazene is by the polymerization of dichloro phosphine nitrile
Into molecular weight 200-5000 straight chain phosphine nitrile, preferred pentachloro- phosphine nitrile.
5. water-soluble diversion agent as claimed in claim 4, it is characterised in that the straight chain poly phosphazene and polylactide polymerisation
Reaction equation be
6. water-soluble diversion agent as claimed in claim 5, it is characterised in that the straight chain branched polylactide is by following methods system
It is standby to form：
Step (1)：After hydroxy benzaldehyde in a kettle. stirring and dissolving, catalyst reaction is added；Then it is pentachloro- phosphine nitrile is molten
Solution, is slowly added dropwise in reactor, stirring reaction；Finally by reacting liquid filtering, merging filtrate removes solvent, recrystallizes to obtain phosphine
Nitrile five is etherified benzaldehyde；
Step (2)：Reducing agent dissolving is obtained into reductant solution；Phosphine nitrile five is etherified the reduction is dropped to after dissolution of benzaldehyde
In agent solution, reaction adds terminator after terminating, and solvent is removed after reaction completely, and extraction, stirring is dried, and filters and be spin-dried for filter
Liquid, obtains the etherificate phenmethylol of phosphine nitrile five；
Step (3)：Phosphine nitrile five is etherified in phenmethylol, initiator and lactide addition autoclave, hybrid reaction is obtained straight chain branch
Change polylactide；
All components content is weight portion；
Preferably, step (1) described catalyst is dividedly in some parts under nitrogen protection, 0 DEG C of temperature in the kettle is kept during addition, after adding
It is warmed to room temperature continuation reaction 2 and is as a child down to -5 DEG C again；Slowly it is added dropwise in 1.5 hours at -5 DEG C after the dissolving of pentachloro- phosphine nitrile
In reactor, stirring 16 hours is then warmed to room temperature；
Preferably, during step (2) etherificate of phosphine nitrile five dissolution of benzaldehyde drops to reductant solution after 0 DEG C, it is warmed to room temperature
Continue to react 1 hour, stirred 12 hours after adding terminator；Step (3) mixed liquor is warming up to after being stirred 2 hours at 120 DEG C
180 DEG C are continued reaction and obtain straight chain branched polylactide in five hours；
Preferably, described this formaldehyde to hydroxyl of step (1) is 10~20 parts, and catalyst is 5~30 parts, and pentachloro- phosphine nitrile is 3~10
Part；Step (2) reducing agent is 3~7 parts, 25~30 parts of the benzaldehyde of etherificate of phosphine nitrile five, 2~4 parts of terminator；Step (3) phosphine nitrile five
2~2.5 parts of phenmethylol of etherificate, 0.005~0.007 part of initiator, 100 parts of lactide.
7. water-soluble diversion agent as claimed in claim 6, it is characterised in that the catalyst is triethylamine, triisopropylamine, carbon
One or more in sour potassium and sodium hydride；And/or, the solvent be anhydrous THF or anhydrous propanone in one or more；Institute
Reducing agent is stated for sodium borohydride；And/or, the terminator is the ammonium chloride solution of 5% concentration.
8. water-soluble diversion agent as claimed in claim 1, it is characterised in that the plasticizer is poly-hydroxy fatty acid, PEG, poly-
One or more in trimethylene carbonate PTMC.
9. water-soluble diversion agent as claimed in claim 1, it is characterised in that the nanoreinforcement material is nano-calcium carbonate, receives
One or more in off-white carbon black, nanoscale talcum powder；And/or, the antioxidant be antioxidant 1010, antioxidant 1076,
One or more in antioxidant 164, antioxidant 264, antioxidant CA；And/or, the lubricant is sweet stearic acid, stearic acid
One or more in grease, paraffin, OPE waxes, silicone oil.
10. the preparation method of a kind of water-soluble diversion agent as described in any one of claim 1~9, it is characterised in that specific
Step is as follows：
(1) straight chain branched polylactide, plasticizer, nanoreinforcement material, antioxidant, lubricant are mixed in banbury in proportion
Refining is uniform, and banbury temperature control is controlled in 90~120 DEG C or so, 8~10min of mixing time；
(2) and then by double screw extruder extruding pelletization, extrusion temperature is 90~100 DEG C of an area, two area~tetra- areas 110~
125 DEG C, five 105~120 DEG C of area~ten areas, 11 110 DEG C of areas, through extruding tie rod after extruded machine extrusion, water-cooled is air-dried, made
Grain is simultaneously crushed, and water-soluble diversion agent is obtained after screening.
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