有机硅涂料(silicone coating)

有机硅涂料（

silicone coating

）

Research progress of organosilicon coatings

Silicone is the first widely used elements of the organic

polymer

compound,

has

excellent

performances

due

to

its

unique

chemical structure, widely used in various fields of national

economy,

but

also

plays

an

important

role

in

the

paint

industry.

Silicone coatings are organosilicon polymer and silicone

modified polymer as main film coating material, it has

excellent heat resistance, electrical insulation, corona

resistance, radiation resistance, moisture resistance and

weather

resistance,

stain resistance,

monk

water

and

chemical

corrosion resistance and other properties, in recent years in

the improvement and application performance of the products

have been the rapid development of.

1 silicone resin coating made of organic silicon resin film

material, mainly heat-resistant, weather resistant silicone

anti- corrosion coating, scratch resistant transparent

silicone coating, release and moisture- proof coatings and

radiation resistant coatings and other varieties.

Coating

with

silicone

resin

with

three

methyl

chlorosilane

(CH3

SiCl3), two methyl two chloro silane [(CH3) 2SiCl2], three

(C6H5SiCL3) phenyl chlorosilane, two phenyl chlorosilane two

[(C6H5) 2SiCl2] and methyl phenyl chlorosilane CHO two (C6H5)

SiCl2 as raw materials for hydrolysis polycondensation

prepared. The effect of monomer structure, number and

proportion of functional groups on properties of coatings is

very important. The types of organic groups connected on

silicon atoms also affect the properties of resins. Different

organic

groups

can

make

organosilicon

resins

exhibit

different

properties. For example, when the organic group is methyl

silicone resin, with thermal stability, releasability,

hydrophobicity and arc resistance; for phenyl, given the

oxidation

stability

of

silicone

resin,

crystalline

polymer

can

be destroyed in a certain range;

As

the

vinyl

group,

the

curing

property

of

organosilicon

resin

can be improved, and coupling property is brought into being;

when phenyl ethyl is used, the compatibility of organosilicon

resin and organic substance can be improved. The base can be

introduced in the siloxane backbone, increase its

compatibility with alkyd resin and polyester resin;

introducing phenylene and two phenyl ether subunit, biphenyl

subunit

of

aromatic

subunit

and

silicon

carbon

boron

polymers,

radiation

resistance,

the

temperature

can

reach

300

to

500

DEG

C;

the

backbone

structure

for

the

Si-N

bond

is

silicone

polymer,

its thermal stability at 400 deg. In practical application,

different organosilicon monomers

can

be

selected

according

to

the requirements, and different organic groups are induced in

the organosilicon resin.

Chenguang Research Institute of chemical industry with a

viscosity of 20 ~ s, 40mPa - hydroxy silicone oil (CH3) and

2SiCl2 methyl triethoxysilane as raw material, control of nR

/ NSI is 1.3 ~ 1.4, the quality of 2SiCl2 (CH3) and hydroxyl

silicone oil ratio was 7O:3O, and the drop of water way at the

temperature

of

50

1H

hydrolysis.

Get

the

methyl

silicone

resin

has good hardness and elasticity, can be used for flame

retardant coatings were prepared by metal film resistors.

Chinese

Academy

of

sciences

so

CH3SiCl3

as

the

main

raw

material,

acetone and xylene as the solvent, soluble trapezoid with

narrow molar mass distribution of poly methyl silicone resin

was synthesized by the high temperature coating resin with a

certain

amount

of

aluminum

powder,

RTV

silicone

rubber

prepared

by 250 DEG C, old 1000 h, its flexibility, oil resistance and

resistance

have

good

corrosion

resistance.

HeFei

University

of

Technology

siloxane

silicate

four

functional

groups

with

three

functional

groups,

through

strict

control of

total

hydrolysis

reaction, the base material is prepared with silicate and

silicone polymer properties, the binder and filler and other

auxiliary materials according to a certain proportion of

organic silicon heat-resisting coating made of.

2

modified

silicone

resin

coating

while

the

silicone

resin

has

many excellent properties, but also has some problems: the

general need for high temperature (150 ~ 200 DEG C) curing,

curing

time,

the

construction

of

large

area

is

not

convenient;

adhesion to the substrate, organic solvent resistance, high

temperature mechanical strength of the film is not good, the

price more expensive etc.. In order to overcome these

shortcomings, organic silicone resin was used to modify the

organic resin. Modified silicone resin usually has the

advantages of two resins, which can make up for some

deficiencies in the performance of the two resins, thereby

improving

performance

and

expanding

application

fields.

There

are two kinds of modification methods, physical mixing and

chemical

modification.

The

effect

of

chemical

modification

is

better than that of physical blending. Chemical modification

is mainly on the end or side chain of polysiloxane chain, and

then react with other polymers to produce block, graft or

interpenetrating polymer networks, thus obtaining new

properties. In the coatings industry, silicone modified

organic resins are mainly alkyd resins. Acrylic resin, epoxy

resin, etc..

2.1 silicone modified alkyd resin coating

Silicone modified alkyd resin coatings is not only an alkyd

resin paint film curing at room temperature and physical and

mechanical properties, and has the advantages of good heat

resistant silicone resin, UV aging resistance and good water

resistance characteristics, coating is an excellent

comprehensive performance. The first modification was to add

the silicone resin directly to the alkyd reaction kettle that

reached the end point,

The

weatherability

of

alkyd

resin

is

improved

greatly.

Another

modification

is

to

prepare

reactive

organosilicon

oligomers

to

react with free hydroxyl groups on alkyd resins, and also to

use organosilicon oligomers as polyols and alkyd resins for

polycondensation. The alkyd resin modified by chemical

reaction

has

better

weatherability.

Hunan

University

prepared

by

alcoholysis

hydroxyl

alkyd

prepolymer

and

end

to

hydrolysis

or different functional silicone prepolymer prepared by

polycondensation

reaction

synthesis

(A

B)

silicone

alkyd

type

n block copolymer, and the copolymer as base material made of

varnish; comprehensive performance of the varnish excellent,

not only has the alkyd resin varnish film flexibility, room

temperature curing, impact strength and advantages of good

adhesion,

but

also

greatly

improve

the

heat

resistance,

ageing

resistance and anti corrosion properties of water medium.

2.2 silicone modified acrylic resin coating

Silicone modified acrylic resin coating has excellent

weatherability.

It

has

the

advantages

of

light

retention,

color

retention,

easy

powdering

and

good

gloss.

It

is

widely

used

for

pre

coating

of

metal

sheets,

painting

of

machine

equipment

and

weatherproof decoration and decoration of interior and

exterior walls of buildings. Silicone modified acrylic resin

has

two

types,

solvent

and

emulsion,

of

which

silicone

acrylic

latex

coating

has

excellent

weatherability,

stain

resistance,

chemical resistance, is an environmentally friendly green

paint.

Hubei

University

uses

a

water- soluble

radical

initiator,

with

hydrogen

containing

silicone

oil

and

butyl

acrylate

as

raw

material, the excellent performance of silicone / acrylic

emulsion was synthesized by emulsion polymerization method;

the

emulsion

has

good

acid

and

alkali.

High

and

low

temperature

resistance and electrolyte stability, the coatings prepared

with it have good weatherability and stain resistance. Ji'nan

Chemical Research of acrylate monomer and D4 and vinyl seven

methyl

siloxane

ring

four

as

raw

material,

by

adding

a

certain

amount

of

grafting

agent,

using

a

batch

of

polyacrylate

stable

synthesis

of

polysiloxane

emulsion.

Sichuan

Province

Building

Materials Industry Research Institute by pre emulsification

process, the activity of silicone and acrylate monomer by

emulsion copolymerization by organosilicon modified acrylic

emulsion

coating

prepared

with

the

emulsion

of

stain

resistance,

excellent comprehensive performance.

Fudan University with vinyl silicone monomer and acrylate,

methyl acrylate and acrylic acid hydroxy ester monomer

polymerization by seed emulsion was stable with excellent

properties of silicone modified acrylate emulsion. Acrylic

silicone resin was modified by organosilicon monomer in

Zhejiang

University,

and

silicone

acrylic

emulsion

coating

was

prepared. Polysiloxane polyacrylate interpenetrating network

coating synthesis of Chongqing University, the coating is

colorless and transparent, high hardness, strong adhesion,

acid deposition, heat aging and has good permeability, can be

used as anti weathering materials of rock friction moment.

HH silicone acrylic resin developed by Shanghai Academy of

building research is suitable for the preparation of weather

resistant coatings with high weatherability for more than 15

years. HeFei University of Technology with TEOS hydrolysis

condensation part

to

polysiloxane

with

hydroxyl acrylic

resin

was prepared by organic silicone modified acrylic resin; the

resin in acid and alkali resistance, salt resistance, solvent

resistance and impact strength has significantly improved

compared with that of pure polysiloxane, and high temperature

resistance is obviously improved acrylic resin. Jiangsu

architectural materials research and Design Institute

introduced

a

certain

amount

of

organosilicon

functional

group

in the synthesis of acrylic resin, and prepared the solvent

modified

silicone

resin

coating

with high weatherability. The

Chinese Academy of Sciences of Lanzhou Institute of Chemical

Physics with hydroxyl terminated poly two methyl siloxane, in

two under the action of azo isobutyronitrile, and methacrylic

acid (ester) monomers by solution copolymerization, silicon

rubber modified acrylic resin, the resin has good heat

resistance.

2.3 silicone modified epoxy resin coating