道康宁有机硅基础培训教程

道康宁有机硅基础培训教程

Silicone ChemistryDow Corning . . . We Help You Invent The Future.1

道康宁有机硅基础培训教程

CONTENTCHEMISTRY OF SILICONES. SILICONE PHYSICO-CHEMICAL PROPERTIES NOMENCLATURE

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道康宁有机硅基础培训教程

The Chemistry of silicones

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道康宁有机硅基础培训教程

-Silicones are organic-inorganic polymers consist of

What are Silicones

silicon, carbon,

oxygen and hydrogen

- Silicon The pure element Si, 28% of earth’s crust - Silica Sand, naturally occurring SiO2 - Silicate Si& O and other metals - Silicone A polymer - Silicone exist as: linear or branched fluids, cyclics, gums, resins, elastomers - There are 1000’s of different products, for 1000’s of different applications Dow Corning . . . We Help You Invent The Future.4

道康宁有机硅基础培训教程

Applications for SiliconesDow Corning’s products and specialty materials are used by customers in virtually every major industry. Aerospace Automotive Chemicals/ Petrochemicals Construction Consumer Products Electrical/Electronics Food Processing Industrial Maintenance Production Medical Products Paints& Coatings Personal, Household& Automotive Care Pharmaceuticals Plastics Pressure-Sensitive Adhesives Textiles& Leather 5

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道康宁有机硅基础培训教程

Making Silicones: Overview

Polymerization Compounding Emulsification etc. etc

CuSeparation

MeCl

Commercial Products

Hydrolyzates:(Linear+ Cyclics)

H2O

ChloroSilanesMe(n)SiCl(4-n)

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From sand to Silicones: 1The two starting materials for our processes are silicon metal and methyl chloride

Reduction of sand into silicon metal:SiO2+ 2 C=> Si+ 2 COSand (silica) Carbon Silicon Carbon monoxide

Methyl chloride production:CH3OH Methanol+ HCl=> CH3Cl+ H2OMethyl Chloride Water Hydrochloric acid

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道康宁有机硅基础培训教程

From sand to Silicones: 2 Direct Process (Rochow): Chlorosilanes(CH3)2 Si Cl2 Silicon Methyl chloride+ CH3 Si Cl3+ (CH3)3 Si Cl+ CH3 H Si Cl2+ other silanes ... Si+ CH3Cl=>%>50 10 - 30<10<5

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道康宁有机硅基础培训教程

From sand to Silicones: 3 Hydrolysis of Chlorosilanes:Me2 Si Cl2+ H2O=> HO(Me2 Si O)nH (linears), n= 20-50+ (Me2SiO)m (cyclics), m= 3,4,5+ HCl (Hydrochloric Acid) Hydrochloric Acid is recovered and used to make Methyl Chloride for the Direct ProcessDow Corning . . . We Help You Invent The Future.9

道康宁有机硅基础培训教程

From sand to Silicones: 4 Polymerisation of cyclicsCyclics+ Me3Si-O-SiMe3=> Me3Si-O-[Me2Si-O]x-SiMe3 endblocker B polydimethysiloxanes

Condensation of linearsLinear+ acid or base=>HOSiMe2-O-[Me2Si-O]y-SiMe2OH

catalyst

Silicone Polymer+ H2O Water

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Polydimethylsiloxane (the simplest silicone)

Repeat Unit

R| -[Si - O]n| R

R= - CH3 (Me) or Organic function n= number of repeat units

Polydimethylsiloxane

Dow Cornin

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How can Silicone Molecular be Changed?Mwt Gum Viscous Fluid Non-Volatile Viscous Fluid Fluid Volatile Fluid Dimethyl Cyclo Linear Polyether Amino Alkyl

X-L

Molecular Structure

Resinous

Organo FunctionalityDow Corning . . . We Help You Invent The Future.12

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Different Molecular Structures/ Physical FormsRing Polymer (Cyclomethicone) Liquid, solidH3 C CH3 H3 C

Silicone Chemistry

Si O

O

Linear Polymer (Dimethicone) Liquid, gumCH3 CH3 CH3 CH3

Si O SiCH3

CH3

(D4)Si O

SiCH3

Si OCH3

Si On CH3

CH3

H3 C

CH3

CH3

Crosslinked Polymer (Gel, Rubber)R Si O

R Si O O O Si O O Si O Si O O Si

R

R Dow Corning . . . We Help You Invent The Future.13

O Resin: Solid, Si LiquidR

O Si O

R

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Organofunctional Silicones Can replace some of the methyl groups withalternative organic groups Me Me Me3SiO(SiO)x(SiO)ySiMe3 Me R

These organosilicones have additional interesting

properties and applications compared to the simple polydimethylsiloxanesDow Corning . . . We Help You Invent The Future.14

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Adding Organic FunctionalityRI gh Hi der y roa tibilit B a p om C

Linear PDMSstan tivi t ynic ga t y Or abili p Ca

Pol

O

O

O

arit y

Phenyl Siloxane

Cr

li ss o

B

c an r

n hi

Sub

n

g in k

gA

PE

PE

A Alkyl Alkyl

Trimethylsilyl Amodimethicone BranchingA A A

Dimethicone Copolyol Alkyl Methyl Siloxanes

Emulsifiers

Silsesquioxane& Silicates

A

PE

Alkyl

PE

Amodimethicone

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道康宁有机硅基础培训教程

Silicone Physico-Chemical properties

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