CN109181674A - A kind of preparation process of covering material - Google Patents
A kind of preparation process of covering material Download PDFInfo
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- CN109181674A CN109181674A CN201811159621.9A CN201811159621A CN109181674A CN 109181674 A CN109181674 A CN 109181674A CN 201811159621 A CN201811159621 A CN 201811159621A CN 109181674 A CN109181674 A CN 109181674A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K8/805—Coated proppants
Abstract
The invention belongs to for drilling or the mixture field of drilling well, specifically disclose a kind of preparation process of covering material, the preparation process for including the following steps: a kind of covering material includes the following steps: that (1) prepares following raw material: aggregate, outer layer polyalcohols resin, internal layer polyalcohols resin, internal layer isocyanate resin, outer layer isocyanate resin, outer layer catalyst, internal layer catalyst and amines additives；Wherein the hydroxyl equivalent of polyalcohols resin is 60-300, and isocyanate resin mass fraction is the 2/5-4/5 of the amount of polyalcohols resin；(2) it heats；(3) mulling；(4) first time overlay film；(5) second of overlay film: (6) shake out.It can be suspended naturally in clear water with proppant prepared by the preparation method, while the pressure break index for meeting conventional proppants, not need to add any thickener in fracturing process, reduce pressure break cost, simplify fracturing technology, reduce the pollution to environment.
Description
Technical field
The present invention relates to for drilling or the mixture field of drilling well, and in particular to a kind of preparation process of covering material.
Background technique
Hydraulic fracturing is the well production increment measure having wide application prospects, and hydrofracturing method is that current exploitation is natural
The principal mode of gas, it is desirable that pour into rammell with the water of a large amount of incorporation chemical substances and carry out hydraulic fragmentation to discharge natural gas.
Hydraulic fracturing technology at home and abroad comparative maturity, petroleum fracturing propping agent must can not as fracturing process China
One of few article, performance superiority and inferiority will directly influence fracturing effect, and apparent density is the important of evaluation proppant performance
One of index, apparent density is lower, and it is lower relative to the relative density of fracturing fluid, after proppant, which carries liquid with pressure break, to be mixed,
The lower apparent density the easier to suspend in fracturing fluid, to greatly reduce reduction of speed rate, will pump farther in pumping procedure.
High pumping pressure pumps fluid into well, while rock stratum of splitting is to allow hydrocarbons preferably to pass through.However, removing non-pressure
It keeps, the aperture otherwise newly formed is closed.In order to open and keep path, support is injected simultaneously during pumping fluid
Agent, support needed for keeping aperture with generation.When forming crack, biography when proppant passes through release hydraulic pressure in the slurry
It passs, proppant forms the filling or support for staying open crack herein.It is general in order to make proppant enter rock stratum with fluid
Method be that these particles suspend in a fluid.
Country's fracturing technology also has part to prepare proppant using coating technique at present, and one layer is generally all only covered in overlay film
Film, in overlay film, resin used is mostly epoxy resin or phenolic resin.Also there is part proppant using two layers of coating technique, inside
After layer epoxy resin or coating phenolic resin, then in outer layer polyurethane resin overlay film.Polyurethane resin is one great
System is to be reacted to be formed with hydroxyl by isocyanate group.
The effect for being currently used for the polyurethane resin of proppant overlay film is to improve the hardness of proppant and reduce proppant
Percentage of damage, but this proppant only meets the requirement of intensity and hardness, still cannot be from suspending.It is still needed when construction
The carrying liquid with viscoelasticity is prepared again, this construction method makes pressure break at high cost, and it is serious to reservoir damage, exist to environment
Pollution.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation process of covering material, which can hang naturally in clear water
It is floating, while the pressure break index for meeting conventional proppants, does not need to add any thickener in fracturing process, reduce
Pressure break cost simplifies fracturing technology, reduces the pollution to environment.
In order to achieve the above objectives, base case of the invention is as follows: a kind of preparation process of covering material, including walks as follows
It is rapid:
(1) prepare following raw material: aggregate, outer layer polyalcohols resin, internal layer polyalcohols resin, internal layer isocyanates
Resin, outer layer isocyanate resin, outer layer catalyst, internal layer catalyst and amines additives；Wherein outer layer polyalcohols resin
Hydroxyl equivalent be 60-300, outer layer isocyanate resin mass fraction be outer layer polyalcohols resin amount 2/5-4/5；
(2) it heats: the aggregate in step (1) is heated to 80-160 DEG C；
(3) mulling: the aggregate in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added to mulling pot
In, and timing；The internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140 DEG C；
(5) second of overlay film: outer layer polyalcohols resin and outer layer are added when the temperature of mulling pot drops to 55-110 DEG C
Catalyst；Amines additives are added when the temperature of mulling pot drops to 45-100 DEG C；It is different that outer layer is added when dropping to 40-90 DEG C in temperature
Cyanate ester resin；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
Using having the beneficial effect that for this base case:
1. using two layers of overlay film in this programme, polyurethane resin and amines additives are used in outer film coating, in overlay film
Polyurethane resin can produce nanoscale protrusion in the process, and protrusion extends in the surface of proppant particles, and protrusion will increase branch
The buoyancy of agent is supportted, while when proppant and water contact, a kind of reserved group in surface can react rapidly with water to be released largely
Gas molecules, these gas molecules or are enclosed in resin film to expand against resin membrane body stage and thicken and increase support
The equivalent diameter of agent granule, or be attached to the extension of proppant surface stage or be gathered in proppant resin film and contacted with water body
Interface on formed one layer package proppant particles body gas blanket, this gas blanket formation stages between proppant particles body
It is connected to and the result closed causes simple grain proppant to form more loose cotton-wool in water body to gather shape, be greatly lowered in this way
The relative density of proppant in water, so as to make proppant suspend in water.When proppant moves in water, proppant
Protrusion on resin film can reduce the proppant rate of settling in water；Part is settled down to the proppant of water bottom accumulation because of its tree
The more protrusion in adipose membrane surface reduces the degree of packing of proppant particles stack layer, the more conventional granulation mass of intergranular water body amount
Product body is more, and then when water body can more easily push its congeries to separate and mobile the fluidity with very little, real
Existing proppant preferably suspends in water.
2. outermost resin generates nano grade air bubbles and can have an impact to the percentage of damage of outermost resin, therefore to aggregate in this programme
Using overlay film twice, outermost resin ensures that the proppant can suspend, and inner layer resin can guarantee the percentage of damage of the proppant.
3. the proppant in this programme is when in use, pre- in macromolecule in polyurethane resin when outermost resin and water contact
The group and water stayed, which reacts rapidly, generates a large amount of gas molecules, these gas molecules are attached to the surface of proppant particles
The gas wrapping hydrated sheath of micro/nano level is formed, while the resin membrane swelling on surface can be caused, and amines additives can increase
The reactivity of polyurethane resin and water improves the suspension effect of proppant.
4. the proppant in this programme can suspend in clear water, without changing the density of water, tradition is replaced to press with clear water
Split liquid, realize zero addition of load fluid thickener in fracturing work, so save conventional pressure break with liquid process and equipment, together
When, the removal of thickener also reduces injury and pressure break cost of the pressure break to reservoir.
5. the hydroxyl equivalent of polyalcohols resin is 60-300, the quality of isocyanate resin is polyalcohols resin quality
2/5-4/5.Inventor has found that the amount of polyalcohols resin and isocyanate resin is controlled in above range by many experiments
When interior, the performance of the polyurethane resin and existing polyurethane resin of synthesis is different.Because of polyalcohols resin and different
Cyanate ester resin can react the polyurethane resin for generating and having micro protrusion, then add amines additives, can be to polyalcohol
Catalytic action is played in resinoid and isocyanate resin reaction, makes to generate a large amount of mutually isolated bubbles inside polyurethane resin.
Because bubble is located inside polyurethane resin, bubble will form a large amount of protrusion on polyurethane resin surface, these protrusions
Size is between 100-500nm, and for protrusion in proppant surface random distribution, protrusion finds that mind is dark in surface sweeping electricity microscopic observation
Be that light color is highlighted or white curved body on the resin membrane body of color, the surface resin film of single particle body have heterogencity with
Machine distribution, then calculating is that the surface of every 100 square micron under homogeneous distribution state has 40 or so protrusions, improves it and suspends certainly
Performance.In addition, the hydroxyl equivalent of polyalcohols resin is 60-300, the quality of isocyanate resin is the 2/ of polyalcohols resin
5-4/5；On the one hand the isocyanate resin of above-mentioned mass number can generate polyurethane resin with whole polyalcohols resin reactions
Afterwards, it is also reserved with a certain amount of isocyanate-reactive group, after remaining isocyanate groups meet water, is reacted with water and meeting
Gas is generated in the microcosmic small space body that the chain element of resin film surrounds, this small quantity gas is under the promotion of reaction energy
Gradually overall volume forms bubble, and resin film is pushed to increase in the radial dimension of proppant particles, makes outer resin layer surface
Dilation reaches most preferably, to further decrease the apparent density and volume density of proppant, the amount of another aspect isocyanate resin
When excessive, the bubble volume generated quantity that is too big and being easy breakage or bubble can be made to make to contact with each other between bubble too much
Lead to the strength reduction of bubble.So the amount control of isocyanate resin is within the above range, the outstanding of proppant can be both guaranteed
Floating effect, and can guarantee the intensity of proppant.
6. using ring using the coated temperature of internal layer polyalcohols resin and internal layer isocyanate resin ratio when inner film coating
Oxygen resin and phenolic resin are low, so using internal layer polyalcohols resin and the energy conservation of internal layer isocyanate resin and production efficiency
It is high.
Further, the mass fraction of each material is as follows in step (1): 80-120 parts of aggregate, internal layer polyalcohols resin, interior
Layer isocyanate resin, internal layer catalyst, outer layer catalyst, outer layer polyalcohols resin, outer layer isocyanate resin and amine
Additive；The mass fraction of outer layer polyalcohols resin is 0.15-3.2 parts；The amount and outer layer isocyanide of internal layer isocyanate resin
The amount of acid ester resin is identical, and internal layer polyalcohols resin is identical as the amount of outer layer polyalcohols resin, wherein polyurethane resin by
Outer layer polyalcohols resin and the synthesis of outer layer isocyanate resin；The amount of outer layer catalyst is the 1/1000-1/ of polyurethane resin
100, the amount of internal layer catalyst and the amount of outer layer catalyst are identical, and the amount of amines additives is the 1/100-1/5 of polyurethane resin.
Inventor has found that the proppant prepared using the raw material of above-mentioned mass fraction is not only good and anti-from suspension effect through test of many times
Percentage of damage is high.
Further, the aggregate is quartz sand or haydite.At low cost using the proppant that quartz sand is aggregate production, acid is molten
Xie Du is low, and haydite sphericity is good, and intensity is big, and water conservancy diversion is good.And it is high with the proppant density that haydite is aggregate production, sphericity is good, resistance to
Corrosion, high temperature resistant are high pressure resistant.
Further, the amines additives are diethylenetriamine, triethylamine, ethamine, ethylenediamine, one in triethylene tetramine
Kind is several.Inventor uses above-mentioned aminated compounds to suspend for the proppant that amines additives make through test of many times discovery
Effect is more preferable and cost is relatively low.
Further, outer layer catalyst and internal layer catalyst are the Organometallic compounds of alkyls tin and/or alkyl ekalead
Object.Inventor has found through test of many times, can accelerate solidification rate and the promotion of outer resin layer as catalyst using above-mentioned substance
Its intensity.
Further, the alkyls tin compound includes dibutyl tin dilaurate, tributyl tin.Inventor is repeatedly tried
It issues after examination and approval now, it is more preferable as the catalytic effect of catalyst using above-mentioned substance.
Further, the alkyls lead compound includes lead tetraethide, isooctyl acid lead.Inventor has found through test of many times,
It is more preferable as the catalytic effect of catalyst using above-mentioned substance.
Further, range of viscosities of the internal layer polyalcohols resin at 20 DEG C is 20~60cp.Inventor is through multiple
Test discovery, can be easier in the gap for entering aggregate using the polyalcohols resin of above-mentioned viscosity in overlay film, be improved
The intensity of proppant reduces percentage of damage.
Detailed description of the invention
Fig. 1 is the electron-microscope scanning figure of the covering material prepared in embodiment 1.
Specific embodiment
Raw material selection is illustrated below, and the present invention is described in further detail by specific embodiment:
Amines additives in the present embodiment are diethylenetriamine, in triethylamine, ethamine, ethylenediamine, triethylene tetramine
It is one or several kinds of.
The dosage and component of outer layer catalyst and internal layer catalyst are all the same in the present embodiment, are di lauric dibutyl
Tin/tributyl tin and lead tetraethide/different pungent isooctyl acid lead mixture.
In the present embodiment, the hydroxyl equivalent of polyalcohols resin is 60-300.
A kind of preparation method of covering material, includes the following steps:
(1) prepare following raw material: 40/70 mesh haydite, outer layer polyalcohols resin, internal layer polyalcohols resin, internal layer
Isocyanate resin, outer layer isocyanate resin, outer layer catalyst, internal layer catalyst and amines additives；
(2) it heats: the haydite in step (1) is heated to 80-160 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added to mulling pot
In, and timing；The internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140 DEG C；
(5) second of overlay film: outer layer polyalcohols resin and outer layer are added when the temperature of mulling pot drops to 55-110 DEG C
Catalyst；Amines additives are added when the temperature of mulling pot drops to 45-100 DEG C；It is different that outer layer is added when dropping to 40-90 DEG C in temperature
Cyanate ester resin；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
Using the above method, covering material is made respectively with the material of different ratio, obtains embodiment 1-6, and difference is implemented
The specific mass fraction of each material is as shown in table 1 in example:
Table 1
Comparative example 1
A kind of preparation method of covering material, includes the following steps:
(1) prepare following raw material: 40,/70 80 parts of mesh haydite, 0.15 part of internal layer polyalcohols resin, internal layer isocyanates
0.09 part of resin, 0.005 part of internal layer catalyst, 0.25 part of outermost resin, 0.15 part of outermost resin curing agent, outermost resin is phenol
Urea formaldehyde or epoxy resin；
(2) it heats: the haydite in step (1) is heated to 80-160 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added to mulling pot
In；The internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140；
(5) second of overlay film: outermost resin is added when the temperature of mulling pot drops to 55-110 DEG C；Temperature to mulling pot
Outermost resin curing agent is added when dropping to 40-90 DEG C；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
Comparative example 2
A kind of preparation method of covering material, includes the following steps:
(1) prepare following raw material: 40,/70 80 parts of mesh haydite, 0.15 part of internal layer polyalcohols resin, internal layer isocyanates
0.09 part of resin, 0.005 part of internal layer catalyst, 0.15 part of outer layer polyalcohols resin, 0.09 part of outer layer isocyanate resin, outside
0.005 part of catalyst of layer；
(2) it heats: the haydite in step (1) is heated to 80-160 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added to mulling pot
In, the internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140 DEG C；
(5) second of overlay film: outer layer polyalcohols resin and outer layer are added when the temperature of mulling pot drops to 55-110 DEG C
Catalyst；Outer layer isocyanate resin is added when the temperature of mulling pot drops to 40-90 DEG C；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
Comparative example 3
(1) prepare following material: 40/70 mesh haydite, outer layer polyalcohols resin, internal layer polyalcohols resin, internal layer are different
Cyanate ester resin, outer layer isocyanate resin, internal layer catalyst, outer layer catalyst and amines additives；The quality of above-mentioned material
Number is as follows: 80 parts of aggregate, outer layer polyalcohols resin mass fraction be 0.15 part, 0.005 part of outer layer catalyst, amine add
Add 0.5 part of agent, 0.15 part of internal layer polyalcohols resin, 0.005 part of internal layer catalyst, it is 0.045 part of outer layer isocyanate resin, interior
0.09 part of isocyanate resin of layer；Wherein the hydroxyl equivalent of outer layer polyalcohols resin is 60-300；
(2) it heats: the haydite in step (1) is heated to 80-160 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added to mulling pot
In, and timing；The internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140 DEG C；
(5) second of overlay film: outer layer polyalcohols resin and outer layer are added when the temperature of mulling pot drops to 55-110 DEG C
Catalyst；Amines additives are added when the temperature of mulling pot drops to 45-100 DEG C；It is different that outer layer is added when dropping to 40-90 DEG C in temperature
Cyanate ester resin；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
Comparative example 4
(1) prepare following material: 40/70 mesh haydite, outer layer polyalcohols resin, internal layer polyalcohols resin, internal layer are different
Cyanate ester resin, outer layer isocyanate resin, internal layer catalyst, outer layer catalyst and amines additives；The quality of above-mentioned material
Number is as follows: 80 parts of aggregate, outer layer polyalcohols resin mass fraction be 0.15 part, 0.005 part of outer layer catalyst, amine add
Add 0.5 part of agent, 0.15 part of internal layer polyalcohols resin, 0.005 part of internal layer catalyst, it is 0.13 part of outer layer isocyanate resin, interior
0.09 part of isocyanate resin of layer；Wherein the hydroxyl equivalent of outer layer polyalcohols resin is 60-300；
(2) it heats: the haydite in step (1) is heated to 80-160 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added to mulling pot
In, and timing；The internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140 DEG C；
(5) second of overlay film: outer layer polyalcohols resin and outer layer are added when the temperature of mulling pot drops to 55-110 DEG C
Catalyst；Amines additives are added when the temperature of mulling pot drops to 45-100 DEG C；It is different that outer layer is added when dropping to 40-90 DEG C in temperature
Cyanate ester resin；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
The performance of proppant made from above-described embodiment and comparative example is tested respectively, the performance of the proppant measured
Index is as follows:
1. suspension time
Suspension time refers to that the maximum duration that can freely suspend in water, experimental data are as shown in table 2:
Table 2
Come as can be seen from Table 2, is all made of polyalcohols resin and isocyanates tree in embodiment 1-6 and comparative example 2
Rouge can be with compared with the proppant that comparative example 1 does not use polyalcohols resin and isocyanate resin to prepare the proppant for preparing
It obtains, the proppant prepared using polyalcohols resin and isocyanate resin can be in clear water from suspension；Embodiment 1-6
Compared with comparative example 2 it can be concluded that, the proppant suspension time prepared after amines additives is added during the preparation process and is both greater than 4
Hour, can fully meet deep-well pressure break requirement, and be not added with amines additives preparation proppant then suspension time is shorter.It is real
A 1-6 and the comparison of comparative example 3 are applied as can be seen that when the amount of isocyanate resin is less, the proppant suspension time of preparation is remote
Much smaller than 4 hours, and when the amount of the isocyanates of addition is more, the proppant of preparation is also small well below 4 from suspension time
When.
2. suspension ratio
It suspends than being to evaluate proppant suspension amount in upper layer accounts for the percentage of total proppant in water, our uses in test
Sand: the case where water is 1:4 is evaluated.Experimental method is to measure 200ml water in the wide-mouth bottle of 300ml with graduated cylinder and pour into extensively
In mouth bottle, precise 50g proppant is poured into the wide-mouth bottle for having filled water, is closed the lid, up and down firmly shake 30 times, and static 10
After minute, firmly shakes 30 times up and down after the same method, the sand of the suspension on upper layer is filtered out after static with filter paper, after drying
The weight for weighing the sand filtered out is m, suspension amount X=m/50*100%.It is as shown in table 3:
Table 3
It can be seen that come from the data in table 3, when static, the riverfrac treatment that embodiment 1-6 is prepared is supported
Agent has a certain amount of proppant that left floating on upper layer；And in comparative example 1-2, due to proppant generate number of bubbles not
It meets the requirements, when static, proppant that upper layer not left floating.
3. other conventional indexs:
Other conventional indexs are as shown in table 4:
Table 4
" certainly outstanding composite index " is the overall target for evaluating proppant suspendability in clear water in upper table, by mattress height
Ratio codetermines with suspending, and engineering significance is practical bulk density of the proppant in clear water, and value is smaller to be equivalent in water
In relative density with regard to smaller, then the suspension of proppant is better, suspension time is longer.
From table 2 to table 4, it can be seen that, one of this programme covering material can reach even better than existing pressure break branch
The indices of agent are supportted, and realize riverfrac treatment, using clear water as fracturing fluid, reduce the configuration process of fracturing fluid complexity,
Equipment has been simplified, manpower waste is reduced, it is most important that has also reduced the pollution to environment.
By embodiment 1 and the comparison of comparative example 1 and comparative example 2 it is found that not using polyalcohols resin and isocyanide in outer layer
When acid ester resin or outer layer use polyalcohols resin or isocyanate resin but are not added with amines additives, the support of preparation
Agent cannot be from suspension or suspension time well below 4 hours in clear water, cannot in the case where not adding other carrying liquid
Meet pressure break demand.
By embodiment 1 and the comparison of comparative example 3 and comparative example 4 it is found that the amount of isocyanate resin is very few cannot to generate needs
The bubble of quantity cannot generate bubble, and isocyanate resin dosage is excessive, and the volume of bubble can be made excessive, causes
Bubble is easy to rupture, and finally proppant suspendability can be made weak, cannot suspended in clear water.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (8)
1. a kind of preparation process of covering material, which comprises the steps of:
(1) prepare following raw material: aggregate, outer layer polyalcohols resin, internal layer polyalcohols resin, internal layer isocyanates tree
Rouge, outer layer isocyanate resin, outer layer catalyst, internal layer catalyst and amines additives；Wherein outer layer polyalcohols resin
Hydroxyl equivalent is 60-300, and outer layer isocyanate resin mass fraction is the 2/5-4/5 of the amount of outer layer polyalcohols resin；
(2) it heats: the aggregate in step (1) is heated to 80-160 DEG C；
(3) mulling: the aggregate in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: by step (1) internal layer polyalcohols resin and internal layer catalyst be added in mulling pot, and
Timing；The internal layer isocyanate resin in step (1) is added when the temperature of mulling pot drops to 75-140 DEG C；
(5) second of overlay film: outer layer polyalcohols resin and outer layer catalysis are added when the temperature of mulling pot drops to 55-110 DEG C
Agent；Amines additives are added when the temperature of mulling pot drops to 45-100 DEG C；Outer layer isocyanic acid is added when dropping to 40-90 DEG C in temperature
Ester resin；
(6) it shakes out: shaking out when mulling pot temperature drops to 30-60 DEG C.
2. a kind of preparation process of covering material according to claim 1, it is characterised in that: each material in step (1)
Mass fraction is as follows: 80-120 parts of aggregate, internal layer polyalcohols resin, internal layer isocyanate resin, internal layer catalyst, outer layer are urged
Agent, outer layer polyalcohols resin, outer layer isocyanate resin and amines additives；The mass fraction of outer layer polyalcohols resin
It is 0.15-3.2 parts；The amount of internal layer isocyanate resin is identical as the amount of outer layer isocyanate resin, internal layer polyalcohols resin
Identical as the amount of outer layer polyalcohols resin, wherein polyurethane resin is by outer layer polyalcohols resin and outer layer isocyanate resin
Synthesis；The amount of outer layer catalyst is the 1/1000-1/100 of polyurethane resin, the amount of internal layer catalyst and the amount of outer layer catalyst
Identical, the amount of amines additives is the 1/100-1/5 of polyurethane resin.
3. a kind of preparation process of covering material according to claim 2, it is characterised in that: the aggregate be quartz sand or
Haydite.
4. a kind of covering material according to claim 3, which is characterized in that the amines additives be diethylenetriamine,
One of triethylamine, ethamine, ethylenediamine, triethylene tetramine are several.
5. a kind of covering material according to claim 4, it is characterised in that: outer layer catalyst and internal layer catalyst are alkane
The organo-metallic compound of base class tin and/or alkyl ekalead.
6. a kind of covering material according to claim 5, it is characterised in that: the alkyls tin compound includes two laurels
Sour dibutyl tin, tributyl tin.
7. a kind of covering material according to claim 6, it is characterised in that: the alkyls lead compound includes tetraethyl
Lead, isooctyl acid lead.
8. a kind of covering material according to claim 7, it is characterised in that: the internal layer polyalcohols resin is at 20 DEG C
Range of viscosities be 20~60cp.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203211A (en) * | 2008-10-29 | 2011-09-28 | 巴斯夫欧洲公司 | A proppant |
| US20160333259A1 (en) * | 2015-05-13 | 2016-11-17 | Preferred Technology, Llc | High performance proppants |
| US20170058190A1 (en) * | 2009-10-20 | 2017-03-02 | Self-Suspending Proppant Llc | Proppants for hydraulic fracturing technologies |
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2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203211A (en) * | 2008-10-29 | 2011-09-28 | 巴斯夫欧洲公司 | A proppant |
| US20170058190A1 (en) * | 2009-10-20 | 2017-03-02 | Self-Suspending Proppant Llc | Proppants for hydraulic fracturing technologies |
| US20160333259A1 (en) * | 2015-05-13 | 2016-11-17 | Preferred Technology, Llc | High performance proppants |
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Application publication date: 20190111 |