CN106318354B - It is a kind of to drop crisp toughening material and preparation method thereof and cement mortar prepared therefrom - Google Patents
It is a kind of to drop crisp toughening material and preparation method thereof and cement mortar prepared therefrom Download PDFInfo
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- CN106318354B CN106318354B CN201510340580.3A CN201510340580A CN106318354B CN 106318354 B CN106318354 B CN 106318354B CN 201510340580 A CN201510340580 A CN 201510340580A CN 106318354 B CN106318354 B CN 106318354B
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of hardened oilwell cements to drop crisp toughening material, it is characterized in that, the material is using the flyash spheric granules of 600 1000 mesh numbers as core, using high molecular polymer of grain size in the range of 0.8 1.2 μm as the composite particles of the nucleocapsid of the shell of surface coated elastomer, and the thickness of the shell of the composite particles of the nucleocapsid is 1.5 3 μm.The invention further relates to the preparation method of the material and by the cement mortar of the material preparation.
Description
Technical field
The present invention relates to a kind of material more particularly to a kind of materials of oilfield applications.The invention further relates to the materials
Preparation method and cement mortar by the material preparation.
Background technology
Cement sheath is the key factor for ensureing annular space sealing in pit shaft.Cement sheath is by larger impact lotus when perforation completion
It carries, for stable yields, volume increase, each oil field all carries out the well stimulations such as water filling, pressure break, acidification in succession, and different operation process is inevitable
It can cause the change of down-hole casing and cement sheath stress.The Behavior of Hardened Cement Paste that conventional oil well mortar architecture is formed is brittleness material
Material, deformability is poor, and toughness is low, and it is impaired to be easy to cause cement sheath, the production of oil well later stage or operation process it is cracked or
Person's microannulus influences later stage production so that cement sheath loses sealability.Simultaneously in later stage production process, due to underground
Temperature, the variation for covering overpressure, cause cement sheath stress state to change, because the shortcomings that traditional cements stone easily leads to cement
Ring is impaired and cracks and its further extends, and causes the channelling between underground oil and gas water layer and the corrosion failure of casing,
Oil/gas well is caused to be scrapped when serious.In the art, the raising of the toughness of Behavior of Hardened Cement Paste, the brittle reduction of Behavior of Hardened Cement Paste are usually with bullet
Property modulus reduction characterization；And cement strength is characterized with compression strength.
Therefore, a kind of novel crisp toughening material of hardened oilwell cement drop of exploitation is badly in need of in this field, can improve Behavior of Hardened Cement Paste
Toughness reduces the brittleness of Behavior of Hardened Cement Paste, while the intensity for the Behavior of Hardened Cement Paste that will not be greatly reduced again.
Invention content
The purpose of the present invention is to provide a kind of novel hardened oilwell cements to drop crisp toughening material, can improve Behavior of Hardened Cement Paste
Toughness, reduce the brittleness of Behavior of Hardened Cement Paste, while the intensity for the Behavior of Hardened Cement Paste that will not be greatly reduced again, with solve exist in the prior art
The problem of.
In order to realize foregoing purpose, the present invention provides a kind of hardened oilwell cements to drop crisp toughening material, which is characterized in that institute
It is the high score using the flyash spheric granules of 600-1000 mesh numbers as core, with grain size in the range of 0.8-1.2 μm to state material
Composite particles of the sub- polymer as the nucleocapsid of the shell of surface coated elastomer, and compound of the nucleocapsid
The thickness of the shell of grain is 1.5-3 μm.
Present inventors discovered unexpectedly that the crisp toughening granular materials of above-mentioned drop is added in oil-well cement slurry system
When, there are the composite particles of the present invention of the thickness of the shell of the composite particles of the nucleocapsid of the present invention can be uniformly distributed and fill out
It fills between cement granules；After cement slurry sets hardening, drop between the skeleton particle that crisp toughening granular materials is filled in Behavior of Hardened Cement Paste.
When Behavior of Hardened Cement Paste is by load action, the skeleton structure in Behavior of Hardened Cement Paste system is the transfer medium of impact force before Behavior of Hardened Cement Paste is broken,
Due to being filled with the crisp toughening particle of drop between skeleton structure, thus skeleton structure by impact force be transmitted to the crisp toughening body particle of drop it
On, then elastic granule absorbs the certain cushioning effect of energy production of part, to improve the deformability of Behavior of Hardened Cement Paste and anti-
Impact flexibility is changed into plastic failure when destruction by the brittle break of common hardened oilwell cement.Therefore, it is particles filled that crisp toughening drops
Hydrated cementitious is formed by the gap of skeleton, the generation and expansion of constraint microcrack is acted on by particle " crack arrest toughening ", simultaneously
The structural deformation center for absorbing strain energy is formed, to reduce the brittleness of hardened oilwell cement and improve toughness.Therefore it mixes
There is the cementing concrete ring that the mortar architecture of the crisp toughening material of drop of the present invention is formed that there is preferable deformability and shock resistance
Toughness can reduce the damage of underground work and environmental condition effect to cement sheath.
The present invention a preferred embodiment in, the material using the flyash spheric granules of 800 mesh numbers as
Core.
The present invention a preferred embodiment in, the material using grain size be 1 μm high molecular polymer as
The shell of surface coated elastomer.
In the preferred embodiment of the present invention, the thickness of the shell of the composite particles of the nucleocapsid is 2 μm.
In the preferred embodiment of the present invention, the flyash spheric granules is fired selected from coal-burning power plant from coal
The fly ash grain that catching is got off in flue gas after burning.
In the preferred embodiment of the present invention, the high molecular polymer is scattered in water selected from polymer particles
The form of the colloid emulsion of middle formation.
In the preferred embodiment of the present invention, the material is by made from spray drying technology.
A further object of the present invention is, provides a kind of oil well cement paste, which is characterized in that includes above-mentioned oil well water
Crisp toughening material drops in mudstone.In the preferred embodiment of the present invention, " crisp toughening drops comprising above-mentioned hardened oilwell cement
Material " can be understood as " dropping crisp toughening material mixed with above-mentioned hardened oilwell cement ".
Including the oil well cement paste of the present invention of the crisp toughening material of drop of the present invention has preferably with oil-well cement and additive
Compatibility.
The stability of cement mortar can be characterized with condensate rate and difference of densities.In the preferred embodiment party of the present invention
In formula, under the conditions of 40-140 DEG C, 60MPa, the density of the cement mortar is 1.65-2.25g/cm3, the fluidity of cement mortar is big
In 18cm, condensate rate is less than 0.5%, difference of densities and is less than 0.02g/cm3。
In the preferred embodiment of the present invention, after maintenance 24-96 hours, preferably 48 hours, the cement
For the elasticity modulus of Behavior of Hardened Cement Paste in slurry in the range of 6-9GPa, Behavior of Hardened Cement Paste compression strength is more than 14MPa.
It is a further object of the invention to provide the preparation methods of above-mentioned material, include the following steps：
Using 600-1000 mesh numbers, preferably 800 mesh numbers flyash spheric granules as core, the model with grain size at 0.8-1.2 μm
In enclosing, preferably 1 μm of high molecular polymer be surface coated elastomer be shell, by spray drying technology, rigidly solid
Body particle flyash surface coats the high molecular polymers such as latex, is prepared the composite particles of nucleocapsid, described compound
The thickness of the shell of grain is preferably 1.5-3.0 μm, more preferably 2 μm.
The preparation method of the above-mentioned material of the present invention brings following advantageous effect：
(1) good with retarder compatibility, the effect of retarder and the thickening time of cement are not influenced after incorporation；
(2) good with fluid loss agent compatibility, do not increase the fluid loss of cement mortar after incorporation；
(3) after mixing, oil well cement paste performance is stablized, and condensate rate and stability meet construction requirement.
The beneficial effects of the present invention are：
(1) the crisp toughening material of drop hydrophily after surface treatment of the invention is preferable, with slurry to be easy；
(2) the crisp toughening material of drop and various additive compatibilities of the invention are good, and oil well cement paste performance is stablized, and meet high
Warm needs of cementing operations；
(3) when the crisp toughening material of the drop that suitable present invention is added in oil well cement paste, to the oil-well cement after hardening
The influence of stone compression strength is smaller, but improves Behavior of Hardened Cement Paste flexural strength, reduces the elasticity modulus of Behavior of Hardened Cement Paste；The drop of the present invention is crisp
Toughening material effectively reduces the brittleness of well-cementing cement, improves shock resistance load toughness and keeps meeting the requirements pressure resistance
Degree；
(4) opposite latex oil-well cement slurry system is cheap, has saved cost；
(5) shape after the cementing slurry condensation that crisp toughening material is prepared is hardened is dropped by the high temperature resistant cementing slurry of the present invention
At Behavior of Hardened Cement Paste, not only increase flexural strength and toughness, and reduce elasticity modulus, improve the crisp of Behavior of Hardened Cement Paste
Property, the deformability after its stress is improved, gas well at HTHP well cementation demand is met, is particularly suitable for current high gas rate well and page
Application in shale oil gas well.
Description of the drawings
The scanning electron microscope diagram of the raw material of crisp toughening material drops in the hardened oilwell cement of Fig. 1 present invention.Wherein, grain
Diameter differ in size about 10 μm spheric granules be flyash, as " core " raw material of nucleocapsid, grain size are about 1 μm of ball
Shape particle is high molecular polymer, is " shell " material of nucleocapsid.
The composite particles scanning electron microscope of the nucleocapsid of crisp toughening material drops in the hardened oilwell cement of Fig. 2 present invention
Figure.Wherein, flyash core is coated with short grained high molecular polymer.
Specific implementation mode
The present invention is further detailed below in conjunction with non-limiting specific embodiment.
The cement used in the examples below that is G grades of oil-well cements of good China, is purchased from the Sichuan cement plants Jia Hua.Fluid loss additive
Model is DZJ-Y, and dispersant model is DZS, and retarder is DZH-2, and antifoaming agent is DZX-1, and heavy weight additive is ground hematite, nanometer
Silicon liquid model is SCLS, and the above additive is all from Dezhou continental shelf petroleum works Technology Co., Ltd..It is silicon that high temperature temperature, which determines agent,
Powder, comes from Fengyang light industrial materials Co., Ltd, and water uses the tap water of Beijing area.
Embodiment 1
With the flyash spheric granules of 800 mesh numbers for " core ", the high molecular polymer for being 1 μm with grain size is surface coated
Elastomer is " shell ", and by spray drying technology, the high molecular polymers such as latex are coated on rigid solid particle flyash surface,
The composite particles for the nucleocapsid that the thickness of the shell of preparation is 2 μm.
The oil-well cement of the raw material and the manufactured present invention of crisp toughening material is dropped to the hardened oilwell cement of the present invention respectively
The composite particles that the nucleocapsid of crisp toughening material drops in stone are scanned electron microscope, and scanning electron microscope diagram is shown in figure respectively
1 and Fig. 2.
Comparative example 1
Using 100 parts of oil-well cement (good G grades of China), 5 parts of fluid loss additive (DZJ-Y), 1 part of dispersant (DZS), retarder
(DZH-2) 0.1 part, 41 parts of water, 0.2 part of antifoaming agent, it is 1.90g/cm to configure density3Oil-well cement slurry system, 80 DEG C and
Conserved 48 hours under 20MPa environment, testing elastic modulus be 11.5GPa, Poisson's ratio 0.19, compression strength 36.5MPa, resist
Tensile strength is 2.9MPa.
Embodiment 2
Using 92 parts of oil-well cement (good G grades of China), 5 parts of fluid loss additive (DZJ-Y), 1 part of dispersant (DZS), retarder
(DZH-2) 0.1 part, 41 parts of water, 0.2 part of antifoaming agent, 8 parts of the crisp toughening material of drop prepared by above-described embodiment 1, configuring density is
1.90g/cm3Oil-well cement slurry system conserve 48 hours under 80 DEG C and 20MPa environment, and testing elastic modulus is 7.2GPa, Poisson
Than being 0.19, compression strength 47.3MPa, tensile strength 5.1MPa.
Compare comparative example 1 with embodiment 2 it is found that compared with traditional cements stone, mixes after dropping crisp toughening material, oil-well cement
The elasticity modulus of stone is greatly lowered, and tensile strength increases, and keeps higher compression strength, and deformability is obviously improved.
Comparative example 2
Using 100 parts of oil-well cement (good G grades of China), 30 parts of high-temperature stabilizer (80 mesh silica flour), fluid loss additive (DZJ-Y) 5
Part, 1.2 parts of dispersant (DZS), 70 parts of heavy weight additive (ground hematite, 250 mesh), 0.1 part of retarder (DZH-2), nano fluid silicon 5
Part, 67 parts of water, 0.2 part of antifoaming agent configures the weighted cement slurry system of traditional performance, density 2.25g/cm3, 130 DEG C
Conserved 48 hours under 20MPa environment, testing elastic modulus be 12.6GPa, Poisson's ratio 0.19, compression strength 26.3MPa,
Tensile strength is
2.2MPa。
Embodiment 3
Using 90 parts of oil-well cement (good G grades of China), 30 parts of high-temperature stabilizer (80 mesh silica flour), fluid loss additive (DZJ-Y) 5
Part, 1.2 parts of dispersant (DZS), 70 parts of heavy weight additive (ground hematite, 250 mesh), 0.1 part of retarder (DZH-2), nano fluid silicon 5
Part, 67 parts of water, 0.2 part of antifoaming agent, 10 parts of the crisp toughening material of drop prepared by above-described embodiment 1, it is 2.25g/cm to configure density3
Oil-well cement slurry system conserve 48 hours under 130 DEG C and 20MPa environment, and testing elastic modulus is 6.8GPa, and Poisson's ratio is
0.20, compression strength 32.0MPa, tensile strength 3.1MPa.
Compare comparative example 2 and embodiment 3 it is found that Mechanical Behavior of Hardened Cement Paste is apparent after the crisp toughening material of drop of the addition present invention
Improve.
Embodiment 4
Using 90 parts of oil-well cement (good G grades of China), 30 parts of high-temperature stabilizer (80 mesh silica flour), fluid loss additive (DZJ-Y) 5
Part, 1.2 parts of dispersant (DZS), 70 parts of heavy weight additive (ground hematite, 250 mesh), 0.1 part of retarder (DZH-2), nano fluid silicon 5
Part, 67 parts of water, 0.2 part of antifoaming agent, the polyphosphazene polymer for being 0.8 μm using the flyash spheric granules of 600 mesh numbers as core, with grain size
Composite particles of the object as the nucleocapsid of the shell of surface coated elastomer are closed, the thickness of the shell of composite particles is 1.5 μm of preparations
10 parts of the crisp toughening material of drop, configure density be 2.25g/cm3Oil-well cement slurry system conserves under 130 DEG C and 20MPa environment
48 hours, testing elastic modulus was 7.3GPa, Poisson's ratio 0.20, compression strength 30.0MPa, tensile strength 2.9MPa.
It is preferable that crisp toughening effect drops.
Embodiment 5
Using 90 parts of oil-well cement (good G grades of China), 30 parts of high-temperature stabilizer (80 mesh silica flour), fluid loss additive (DZJ-Y) 5
Part, 1.2 parts of dispersant (DZS), 70 parts of heavy weight additive (ground hematite, 250 mesh), 0.1 part of retarder (DZH-2), nano fluid silicon 5
Part, 67 parts of water, 0.2 part of antifoaming agent, the macromolecule for being 1.2 μm using the flyash spheric granules of 1000 mesh numbers as core, with grain size
The thickness of the shell of composite particles of the polymer as the nucleocapsid of the shell of surface coated elastomer, composite particles is 3 μm of preparations
10 parts of the crisp toughening material of drop, configure density be 2.25g/cm3Oil-well cement slurry system conserves under 130 DEG C and 20MPa environment
48 hours, testing elastic modulus was 7.2GPa, Poisson's ratio 0.20, compression strength 33.0MPa, tensile strength 3.2MPa.
It is preferable that crisp toughening effect drops.
Comparative example 3
Using 90 parts of oil-well cement (good G grades of China), 30 parts of high-temperature stabilizer (80 mesh silica flour), fluid loss additive (DZJ-Y) 5
Part, 1.2 parts of dispersant (DZS), 70 parts of heavy weight additive (ground hematite, 250 mesh), 0.1 part of retarder (DZH-2), nano fluid silicon 5
Part, 67 parts of water, 0.2 part of antifoaming agent, the polyphosphazene polymer for being 0.6 μm using the flyash spheric granules of 400 mesh numbers as core, with grain size
Composite particles of the object as the nucleocapsid of the shell of surface coated elastomer are closed, the thickness of the shell of composite particles is 1.2 μm of preparations
10 parts of the crisp toughening material of drop, configure density be 2.25g/cm3Oil-well cement slurry system conserves under 130 DEG C and 20MPa environment
48 hours, testing elastic modulus was 9.3GPa, Poisson's ratio 0.20, compression strength 38.0MPa, tensile strength 3.6MPa.
It is poor that crisp toughening effect drops.
Comparative example 4
Using 90 parts of oil-well cement (good G grades of China), 30 parts of high-temperature stabilizer (80 mesh silica flour), fluid loss additive (DZJ-Y) 5
Part, 1.2 parts of dispersant (DZS), 70 parts of heavy weight additive (ground hematite, 250 mesh), 0.1 part of retarder (DZH-2), nano fluid silicon 5
Part, 67 parts of water, 0.2 part of antifoaming agent, the macromolecule for being 1.4 μm using the flyash spheric granules of 1200 mesh numbers as core, with grain size
The thickness of the shell of composite particles of the polymer as the nucleocapsid of the shell of surface coated elastomer, composite particles is 4 μm of preparations
10 parts of the crisp toughening material of drop, configure density be 2.25g/cm3Oil-well cement slurry system conserves under 130 DEG C and 20MPa environment
48 hours, testing elastic modulus was 6.2GPa, Poisson's ratio 0.20, compression strength 24.0MPa, tensile strength 2.9MPa.
There is the crisp toughening effect of certain drop, but larger to intensity effect.
Comparative example 5
Using 100 parts of oil-well cement (good G grades of China), 5 parts of fluid loss additive (DZJ-Y), 1 part of dispersant (DZS), retarder
(DZH-2) 0.1 part, 41 parts of water, 0.2 part of antifoaming agent, crisp 8 parts of the toughening material of rubber grain drop, testing elastic modulus is 7.9GPa,
Poisson's ratio is 0.19, compression strength 26.3MPa, tensile strength 2.6MPa.Rubber grain is mixed, although reducing springform
Amount, has the crisp toughening effect of certain drop, but significantly reduces the compression strength and tensile strength of Behavior of Hardened Cement Paste.
It should be noted that embodiment described above is only used for explaining the present invention, do not constitute to any of the present invention
Limitation.By referring to exemplary embodiments, invention has been described, it should be appreciated that word used in it is descriptive
With explanatory vocabulary, rather than limited vocabulary.The present invention can be made within the scope of the claims by regulation
Modification, and the present invention is revised in without departing substantially from scope and spirit of the present invention.Although the present invention described in it relates to
And specific method, material and embodiment, it is not intended that the present invention is limited to particular case disclosed in it, on the contrary, this hair
It is bright to can be extended to other all methods and applications with the same function.
Claims (12)
1. crisp toughening material drops in a kind of hardened oilwell cement, which is characterized in that the material is with the flyash of 600-1000 mesh numbers
Spheric granules as core, using high molecular polymer of grain size in the range of 0.8-1.2 μm as surface coated elastomer
The composite particles of the nucleocapsid of shell, and the thickness of the shell of the composite particles of the nucleocapsid is 1.5-3 μm.
2. material according to claim 1, which is characterized in that the material is made with the flyash spheric granules of 800 mesh numbers
For core.
3. material according to claim 1 or 2, which is characterized in that the high molecular polymer that the material is 1 μm with grain size
Shell as surface coated elastomer.
4. material according to claim 1 or 2, which is characterized in that the thickness of the shell of the composite particles of the nucleocapsid is 2
μm。
5. material according to claim 1 or 2, which is characterized in that the flyash spheric granules is coal-burning power plant from coal
The fly ash grain that catching is got off in flue gas after burning, the high molecular polymer are that polymer particles are dispersed in water to be formed
Colloid emulsion form.
6. material according to claim 1 or 2, which is characterized in that the material is by made from spray drying technology.
7. a kind of oil well cement paste, which is characterized in that include the hardened oilwell cement according to any one of claim 1-6
Crisp toughening material drops.
8. cement mortar according to claim 7, which is characterized in that under the conditions of 40-140 DEG C, 60MPa, the cement mortar
Density be 1.65-2.25g/cm3, more than 18cm, condensate rate is less than 0.5%, difference of densities and is less than the fluidity of cement mortar
0.02g/cm3。
9. cement mortar according to claim 7 or 8, which is characterized in that after maintenance 24-96 hours, in the cement mortar
Behavior of Hardened Cement Paste elasticity modulus in the range of 6-9GPa, Behavior of Hardened Cement Paste compression strength be more than 14MPa.
10. cement mortar according to claim 9, which is characterized in that after maintenance 48 hours, the cement in the cement mortar
For the elasticity modulus of stone in the range of 6-9GPa, Behavior of Hardened Cement Paste compression strength is more than 14MPa.
11. the preparation method of the material according to any one of claim 1-6, includes the following steps：With 600-1000
The flyash spheric granules of mesh number is core, is surface coated with high molecular polymer of grain size in the range of 0.8-1.2 μm
Elastomer is shell, and by spray drying technology, the high molecular polymers such as latex, system are coated on rigid solid particle flyash surface
Standby to obtain the composite particles of nucleocapsid, the thickness of the shell of the composite particles is preferably 1.5-3.0 μm.
12. according to the method for claim 11, including the following steps：Using the flyash spheric granules of 800 mesh numbers as core, with
It is surface coated elastomer is shell that grain size, which is 1 μm of high molecular polymer, by spray drying technology, in rigid solid particle
Fine coal gray surface coats the high molecular polymers such as latex, and the composite particles of nucleocapsid, the shell of the composite particles is prepared
Thickness is 2 μm.
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| CN107814503A (en) * | 2017-10-26 | 2018-03-20 | 贵州中建建筑科研设计院有限公司 | A kind of spacetabs type complex mineral blending material |
| CN112608080B (en) * | 2020-12-08 | 2023-02-03 | 广东省福美材料科学技术有限公司 | Color active mixed material and preparation method and application thereof |
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