CN105869711A - Insulating layer material of iron disk electric heating element and preparation method of insulating layer material - Google Patents

Insulating layer material of iron disk electric heating element and preparation method of insulating layer material Download PDF

Info

Publication number
CN105869711A
CN105869711A CN201610438850.9A CN201610438850A CN105869711A CN 105869711 A CN105869711 A CN 105869711A CN 201610438850 A CN201610438850 A CN 201610438850A CN 105869711 A CN105869711 A CN 105869711A
Authority
CN
China
Prior art keywords
insulating layer
layer material
iron pan
class heating
pan class
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610438850.9A
Other languages
Chinese (zh)
Other versions
CN105869711B (en
Inventor
倪忠伟
史生川
高斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liaoning Jiashun Technology Co.,Ltd.
Original Assignee
Liaoning Jiashun Chemical Science And Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liaoning Jiashun Chemical Science And Technology Co Ltd filed Critical Liaoning Jiashun Chemical Science And Technology Co Ltd
Priority to CN201610438850.9A priority Critical patent/CN105869711B/en
Publication of CN105869711A publication Critical patent/CN105869711A/en
Application granted granted Critical
Publication of CN105869711B publication Critical patent/CN105869711B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/126—Preparation of silica of undetermined type
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/181—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process
    • C01B33/183—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/80—Constructional details

Abstract

The invention provides an insulating layer material of an iron disk electric heating element and a preparation method of the insulating layer material. The insulating layer material of the iron disk electric heating element is prepared from the following ingredients in parts by weight: 60-80 parts of highest crystallizing fused magnesia, 5 parts of calcined kaolin, 0.4-1 part of aluminium oxide fine power, 0.2-0.5 part of methyl silicone resin, and 5-10 parts of amorphous SiO2 fine power. The insulating layer material of the iron disk electric heating element is scientific and reasonable in formula, has favorable plasticity, dampproof insulativity and crack resistance, and can be widely applied to electric heating elements such as electric heating iron disks.

Description

Insulating layer material of iron pan class heating and preparation method thereof
Technical field
The present invention relates to material technology, particularly relate to insulating layer material and the system thereof of a kind of iron pan class heating Preparation Method.
Background technology
Fused magnesium oxide is a kind of topmost insulation high-temperature-resistant packing material, and it has superior insulating properties Can be widely used in various electrical heating elements with high-termal conductivity.But have a disadvantage in that electrician's level aoxidizes The plasticity of magnesium own is poor, needs kalamein parts when generally using, after bigger undergauge, and just meeting Possesses certain hardness.When being applied to iron pan class heating, after oil pressure molding, its hardness is undesirable, Easily cracking, poor plasticity, constrain fused magnesium oxide application in this series products significantly.
Summary of the invention
It is an object of the invention to, apply at iron pan class heating for above-mentioned existing fused magnesium oxide Time, after oil pressure molding, its hardness is undesirable, easy to crack, the problem of poor plasticity, proposes a kind of iron pan The insulating layer material of class heating, this material prescription science, rationally, there is excellent physicochemical property, Can be as the insulant needing oil pressure to shape, as wrapped up the insulant of heating wire in electric heating iron pan groove.
For achieving the above object, the technical solution used in the present invention is: a kind of iron pan class heating exhausted Edge layer material (is called for short: iron pan powder), including each component that weight proportion is following:
Further, the insulating layer material of described iron pan class heating, including following each of weight proportion Component:
Further, described calcined kaolin, is a kind of nonmetallic minerals, is a kind of viscous with kaolinite race Soil mineral are main clay and clay rock.Because of white and fine and smooth, also known as white clouds soil.
Further, described aluminium oxide is micron order aluminium oxide, possesses excellent dispersibility, excellent suction Attached property.
Further, described methyl silicon resin is a kind of methyl silicon resin being dissolved in toluene.Methyl silicon SiO in resin2Content is the highest (about contains the SiO of 80%wt after complete oxidation2, contain according to hard resin Amount calculates [DSC]) it is the perfect binding agent for 300 DEG C of environment above, and there is good electric draw last breath Edge performance.
Further, described amorphous Si O2Powder particle size is less than 250-325 mesh, be a kind of high-performance, Volume stable anti-cracking agent.Amorphous Si O of the present invention2After fine powder mixes according to proportioning, have the most micro- Expand, high effect leakage proof, high-durability, high cracking resistance..
Another object of the present invention also discloses the preparation of the insulating layer material of a kind of iron pan class heating Method, comprises the following steps: after weighing each component according to weight proportion, and blender mix homogeneously obtains ferrum The insulating layer material of dish class heating.
Further, described amorphous Si O2The preparation of fine powder comprises the following steps: with Silicon chloride., hydrogen Gas, air (with oxymeter) are as raw material, and wherein Silicon chloride., hydrogen, the amount ratio of air can use often Rule ratio, by Silicon chloride., hydrogen, air mixing, and with 0.3-0.5m3The ratio of/Kg puts into water Solving the reaction that is hydrolyzed in stove, reaction temperature is 900-1100 DEG C, and reaction generates silicon dioxide primary particle； The aggregated device of this reactant is gathered into state of aggregation particle, through cyclonic separation, two-stage air injection deacidification, boiling Rise bed screening and obtain amorphous Si O2Fine powder.
Another object of the present invention additionally provides a kind of iron pan class heating, by above-mentioned iron pan class electric heating The insulating layer material of element is wrapped up in heating wire oil pressure and is shaped or by the insulating barrier material of above-mentioned iron pan class heating Expect that direct oil pressure, in metallic channel, is dried at 200～400 DEG C after molding and obtains iron pan class in 2～4 hours Heating.
Further, described oil pressure pressure is 300-600kg/cm2。
The insulating layer material scientific formulation of iron pan class heating of the present invention, rationally, its preparation method is simple, Easy, have the advantage that compared with prior art
The present invention is with high activity amorphous Si O2Fine powder is raw material, improves fused magnesium oxide powder plasticity Performance so that it is possess higher room temperature hardness, excellent line degeneration energy.Have more excellent after its molding High-temperature insulation performance, excellent damp proof insulation performance, excellent anti-crack performance, can be widely used in In the heating of electric heating iron pan class.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described:
Embodiment 1
Present embodiment discloses the insulating layer material of a kind of iron pan class heating, as follows including weight proportion Each component:
Described aluminium oxide is micron order aluminium oxide, possesses excellent dispersibility, excellent adsorptivity.Described Methyl silicon resin is a kind of methyl silicon resin being dissolved in toluene.SiO in methyl silicon resin2Content is the highest (after complete oxidation, about contain the SiO of 80%wt2, calculating [DSC] according to solid resin content) and it is to use In the perfect binding agent of 300 DEG C of environment above, and there are superior electrical insulating properties.Described amorphous SiO2Powder particle size is less than 250 mesh, is a kind of high-performance, volume stable anti-cracking agent.Nothing in the present embodiment Setting SiO2After fine powder mixes according to proportioning, grinding forms, and is that one has efficient microdilatancy, Effective Anti Ooze, high-durability, high cracking resistance
The preparation method of the insulating layer material of iron pan class heating, comprises the following steps: join according to weight After weighing each component, mix homogeneously obtains the insulating layer material of iron pan class heating.The most amorphous SiO2The preparation of fine powder comprises the following steps: with Silicon chloride., hydrogen, air (with oxymeter) as raw material, By Silicon chloride., hydrogen, air mixing, and with 0.3-0.5m3The ratio of/Kg is put in hydrolysis stove Row hydrolysis, this input process is uninterrupted continuously, and reaction temperature is 900-1100 DEG C, reacts generation two Silicon oxide primary particle；The aggregated device of this reactant is gathered into state of aggregation particle, through cyclonic separation, twin-stage Air injection deacidification, ebullated bed screening obtain amorphous Si O2Fine powder.
The performance parameter of the insulating layer material of the present embodiment iron pan class heating is as follows after testing:
Bulk density: 2.8-2.9g/cm3
Compressive resistance (800 DEG C of Χ 3h): >=60Mpa
Mar proof :≤6cc
Line change after burning: (800 DEG C of Χ 3h) :≤1%.
Electrical insulation properties :≤0.5mA
High-Voltage Insulation: 1500V/1mA.s
The insulating layer material using iron pan class heating of the present invention prepares iron pan class heating, by iron pan The direct oil pressure of insulating layer material of class heating in metallic channel, oil pressure pressure: 300kg/cm2Heat treatment Dry temperature: be dried at 450 DEG C and prepare iron pan powder in 3 hours.
Embodiment 2
Present embodiment discloses the insulating layer material of a kind of iron pan class heating, as follows including weight proportion Each component:
Described aluminium oxide is micron order aluminium oxide, possesses excellent dispersibility, excellent adsorptivity.Described Methyl silicon resin is a kind of methyl silicon resin being dissolved in toluene.SiO in methyl silicon resin2Content is the highest (after complete oxidation, about contain the SiO of 80%wt2, calculating [DSC] according to solid resin content) and it is to use In the perfect binding agent of 300 DEG C of environment above, and there are superior electrical insulating properties.Described amorphous SiO2Powder particle size is less than 250 mesh, is a kind of high-performance, volume stable anti-cracking agent.Nothing in the present embodiment Setting SiO2After fine powder mixes according to proportioning, grinding forms, and is that one has efficient microdilatancy, Effective Anti Ooze, high-durability, high cracking resistance.
The preparation method of the insulating layer material of iron pan class heating, comprises the following steps: join according to weight After weighing each component, mix homogeneously obtains the insulating layer material of iron pan class heating.The most amorphous SiO2The preparation of fine powder comprises the following steps: with Silicon chloride., hydrogen, air (with oxymeter) as raw material, By Silicon chloride., hydrogen, air mixing, and with 0.3-0.5m3The ratio of/Kg is put in hydrolysis stove Row hydrolysis, reaction temperature is 900-1100 DEG C, and reaction generates silicon dioxide primary particle；This reaction The aggregated device of thing is gathered into state of aggregation particle, through cyclonic separation, two-stage air injection deacidification, ebullated bed sieve Choosing obtains amorphous Si O2Fine powder.
The performance parameter of the insulating layer material of the present embodiment iron pan class heating is as follows after testing:
Bulk density: 2.32-2.34g/cm3
Compressive resistance (800 DEG C of Χ 3h): >=40Mpa
Mar proof :≤5cc
Line change after burning: (800 DEG C of Χ 3h) :≤0.5%.
Electrical insulation properties :≤0.5mA
High-Voltage Insulation: 1500V/1mA.s
The insulating layer material using iron pan class heating of the present invention prepares iron pan class heating, by iron pan The direct oil pressure of insulating layer material of class heating in metallic channel, oil pressure pressure: 600kg/cm2Heat treatment Dry temperature: be dried at 270 DEG C and prepare iron pan powder in 15 hours.
Embodiment 3
Present embodiment discloses the insulating layer material of a kind of iron pan class heating, as follows including weight proportion Each component:
Described aluminium oxide is micron order aluminium oxide, possesses excellent dispersibility, excellent adsorptivity.Described Methyl silicon resin is a kind of methyl silicon resin being dissolved in toluene.SiO in methyl silicon resin2Content is the highest (after complete oxidation, about contain the SiO of 80%wt2, calculating [DSC] according to solid resin content) and it is to use In the perfect binding agent of 300 DEG C of environment above, and there are superior electrical insulating properties.Described amorphous SiO2Powder particle size is less than 250 mesh, is a kind of high-performance, volume stable anti-cracking agent.Nothing in the present embodiment Setting SiO2After fine powder mixes according to proportioning, grinding forms, and is that one has efficient microdilatancy, Effective Anti Ooze, high-durability, high cracking resistance.
The preparation method of the insulating layer material of iron pan class heating, comprises the following steps: join according to weight After weighing each component, mix homogeneously obtains the insulating layer material of iron pan class heating.The most amorphous SiO2The preparation of fine powder comprises the following steps: with Silicon chloride., hydrogen, air (with oxymeter) as raw material, By Silicon chloride., hydrogen, air mixing, and with 0.3-0.5m3The ratio of/Kg puts into hydrolysis continuously Be hydrolyzed in stove reaction, and reaction temperature is 900-1100 DEG C, and reaction generates silicon dioxide primary particle； The aggregated device of this reactant is gathered into state of aggregation particle, through cyclonic separation, two-stage air injection deacidification, boiling Rise bed screening and obtain amorphous Si O2Fine powder.
The performance parameter of the insulating layer material of the present embodiment iron pan class heating is as follows after testing:
Bulk density: 2.30-2.32g/cm3
Compressive resistance (800 DEG C of Χ 3h): >=50Mpa
Mar proof :≤6cc
Line change after burning: (800 DEG C of Χ 3h) :≤0.8%.
Electrical insulation properties :≤0.5mA
High-Voltage Insulation: 1500V/1mA.s
The insulating layer material using iron pan class heating of the present invention prepares iron pan class heating, by iron pan The direct oil pressure of insulating layer material of class heating in metallic channel, oil pressure pressure: 500kg/cm2Heat treatment Dry temperature: be dried at 320 DEG C and prepare iron pan powder in 8 hours.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, rather than to it Limit；Although the present invention being described in detail with reference to foregoing embodiments, the ordinary skill of this area Personnel it is understood that the technical scheme described in foregoing embodiments still can be modified by it, or The most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, do not make phase The essence answering technical scheme departs from the scope of various embodiments of the present invention technical scheme.

Claims (9)

1. the insulating layer material of an iron pan class heating, it is characterised in that include that weight proportion is as follows Each component:
The insulating layer material of iron pan class heating the most according to claim 1, it is characterised in that bag Include each component that weight proportion is following:
The insulating layer material of iron pan class heating the most according to claim 1 or claim 2, it is characterised in that Described aluminium oxide is micron order aluminium oxide.
The insulating layer material of iron pan class heating the most according to claim 1 or claim 2, it is characterised in that Described methyl silicon resin is a kind of methyl silicon resin being dissolved in toluene.
The insulating layer material of iron pan class heating the most according to claim 1 or claim 2, it is characterised in that Described amorphous Si O2Powder particle size is less than 250-325 mesh.
6. the preparation of the insulating layer material of iron pan class heating described in a claim 1-5 any one Method, it is characterised in that comprise the following steps: after weighing each component according to weight proportion, blender mixes Close the insulating layer material uniformly obtaining iron pan class heating.
The most according to claim 6, the preparation method of the insulating layer material of iron pan class heating, it is special Levy and be, described amorphous Si O2The preparation of fine powder comprises the following steps: by Silicon chloride., hydrogen, sky Gas mixes, and with 0.3-0.5m3The ratio of/Kg puts into the reaction that is hydrolyzed in hydrolysis stove, reaction temperature For 900-1100 DEG C, reaction generates silicon dioxide primary particle；The aggregated device of this reactant is gathered into gathering State particle, obtains amorphous Si O through cyclonic separation, two-stage air injection deacidification, ebullated bed screening2Fine powder.
8. an iron pan class heating, it is characterised in that by ferrum described in claim 1-5 any one The insulating layer material of dish class heating is wrapped up in heating wire oil pressure and is shaped or by claim 1-6 any one The direct oil pressure of insulating layer material of described iron pan class heating in metallic channel, after molding 200～ It is dried at 400 DEG C and within 2～4 hours, obtains iron pan class heating.
Iron pan class heating the most according to claim 8, it is characterised in that described oil pressure pressure is 300-600kg/cm2。
CN201610438850.9A 2016-06-17 2016-06-17 Insulating layer material of iron pan class electric heating element and preparation method thereof Active CN105869711B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610438850.9A CN105869711B (en) 2016-06-17 2016-06-17 Insulating layer material of iron pan class electric heating element and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610438850.9A CN105869711B (en) 2016-06-17 2016-06-17 Insulating layer material of iron pan class electric heating element and preparation method thereof

Publications (2)

Publication Number Publication Date
CN105869711A true CN105869711A (en) 2016-08-17
CN105869711B CN105869711B (en) 2017-11-24

Family

ID=56650821

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610438850.9A Active CN105869711B (en) 2016-06-17 2016-06-17 Insulating layer material of iron pan class electric heating element and preparation method thereof

Country Status (1)

Country Link
CN (1) CN105869711B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110945965A (en) * 2017-06-01 2020-03-31 金叡院 Radiator with heating device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1208016A (en) * 1998-08-27 1999-02-17 沈阳化工股份有限公司 Gas phase process preparing white carbon
CN1923750A (en) * 2006-09-28 2007-03-07 庄伟� Preparation method of high temperature resisting electrothermal insulating magnesia material
US20080258270A1 (en) * 2004-10-13 2008-10-23 Commissariat A L'energie Atomique Mgo-Based Coating for Electrically Insulating Semiconductive Substrates and Production Method Thereof
CN102254652A (en) * 2011-04-20 2011-11-23 荆巍 Preparation method of magnesia heat-conducting insulating material for electric heating tube
CN103971786A (en) * 2013-12-27 2014-08-06 上海实业振泰化工有限公司 Electric-grade organic coating high-temperature-resistant insulating magnesia powder for electric ovens and production method of electric-grade organic coating high-temperature-resistant insulating magnesia powder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1208016A (en) * 1998-08-27 1999-02-17 沈阳化工股份有限公司 Gas phase process preparing white carbon
US20080258270A1 (en) * 2004-10-13 2008-10-23 Commissariat A L'energie Atomique Mgo-Based Coating for Electrically Insulating Semiconductive Substrates and Production Method Thereof
CN1923750A (en) * 2006-09-28 2007-03-07 庄伟� Preparation method of high temperature resisting electrothermal insulating magnesia material
CN102254652A (en) * 2011-04-20 2011-11-23 荆巍 Preparation method of magnesia heat-conducting insulating material for electric heating tube
CN103971786A (en) * 2013-12-27 2014-08-06 上海实业振泰化工有限公司 Electric-grade organic coating high-temperature-resistant insulating magnesia powder for electric ovens and production method of electric-grade organic coating high-temperature-resistant insulating magnesia powder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110945965A (en) * 2017-06-01 2020-03-31 金叡院 Radiator with heating device
CN110945965B (en) * 2017-06-01 2022-02-15 金叡院 Radiator with heating device

Also Published As

Publication number Publication date
CN105869711B (en) 2017-11-24

Similar Documents

Publication Publication Date Title
CN105733265B (en) A kind of preparation method of heat-conducting silicone grease
EP3490954A1 (en) Method for producing hydrophobic heat insulation material
JP2010532075A5 (en)
CN103865496B (en) A kind of insulating heat-conductive powder, material and preparation method thereof
CN106905698A (en) Insulating radiation sheet material
CN101928145A (en) Preparation method of superfine and high-purity gamma-ALON transparent ceramics powder
JP2019531247A (en) Method for producing spherical aluminum nitride powder
Chen et al. Large-scale and low-cost synthesis of in situ generated SiC/C nano-composites from rice husks for advanced electromagnetic wave absorption applications
CN105293499B (en) A kind of preparation method of B, N codope nanometer silicon carbide absorbing material
CN102024505A (en) Silicone oil electric force compound grease and preparation method thereof
CN100467424C (en) Powder body of solid solution among interlayer of titanium, silicon, aluminum, carbon, and preparation method
CN105869711A (en) Insulating layer material of iron disk electric heating element and preparation method of insulating layer material
CN104072102A (en) Red porcelain ceramic product
CN104119037A (en) High-strength thermal insulation mortar and preparation method thereof
CN109133952A (en) High-temperature-resandant andant cracking-resistant type abrasion-proof fire-resistant moldable refractory
Wang et al. Preparation of dense spherical AlN fillers by aqueous granulation and post-sintering process
CN103936423B (en) A kind of silicon carbide-based microwave absorbing composite material
JP2786191B2 (en) Method for producing magnesium oxide powder
CN106317964A (en) Submicron composite sphere and preparation method thereof, and application of submicron composite sphere as silicone rubber ceramic-forming filling material
JP2005527460A (en) Silicone composition
CN106916357A (en) A kind of cross-linked poly-ethylene cable material and preparation method thereof
CN104556002B (en) Method for preparing high-purity graphene
CN110256766A (en) A kind of preparation method of insulating heat-conductive cable cover(ing)
CN103524894B (en) A kind of probing exploration cable rubber sheath material and preparation method thereof
CN108467676A (en) A kind of graphene silicon rubber waterproof coating

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP03 Change of name, title or address
CP03 Change of name, title or address

Address after: 115000 huizhuang village, Yong'an Town, Dashiqiao City, Yingkou City, Liaoning Province

Patentee after: Liaoning Jiashun Technology Co.,Ltd.

Address before: 115109 huizhuang village, Yong'an Town, Dashiqiao City, Yingkou City, Liaoning Province

Patentee before: LIAONING JIASHUN CHEMICAL SCIENCE AND TECHNOLOGY Co.,Ltd.