Silicone oligomer

Japan Shin-Etsu Silicone Oligomer Type A

Silicone oligomer

Silicone oligomer is a relatively low molecular weight silicone resin. Due to its structural characteristics, it plays a great role as a resin monomer, as a modifier of organic resin, and as an interface modifier. is a very unique product.

(1) As a resin monomer

Main features: water resistance, weather resistance, high hardness

Applications: Body Coatings, Floor Coatings, Hydrophobicity

(2) As an organic resin modifier

Main features: adhesion, weather resistance, water resistance

Applications: substrates, sealing materials, adhesives, adhesives, coatings for building materials

Type A product

Type A products, although containing alkoxysilyl groups, do not contain reactive functional groups, and are composed of a single methyl group or a methyl group and a phenyl group. It can be said that this is a structure similar to that of silicone resin.

Methyl type: Methyl type organosilicon oligomers have excellent water-decomposability, and if a catalyst is used in combination, a room temperature moisture-curable coating agent can be produced. In addition, a coating with high hardness and high water repellency can be formed.

Methyl/phenyl type: Because of its good compatibility with organic resins, it can be used as organic resin modifier and reactive diluent. In addition, flexibility can be imparted to room temperature moisture-curable coating agents composed of methyl-based oligomers and catalysts

	organic substituent	alkoxy	viscosity 25°C mm2/s	refractive index 25°C	Alkoxy content Wt%	Features
KC-89S	methyl	Methoxy	5	1.394	45	low polymer
KR-515	methyl	Methoxy	7	1.397	40	medium polymer
KR-500	methyl	Methoxy	25	1.403	28	medium polymer
X-40-9225	methyl	Methoxy	100	1.407	24	high polymer
X-40-9246	methyl	Methoxy	80	1.407	12	give flexibility
X-40-9250	methyl	Methoxy	80	1.407	25	Provide flexibility and thick film
KR-401N	Methyl/phenyl	Methoxy	20	1.432	33	Contains low phenyl type
X-40-9227	Methyl/phenyl	Methoxy	15	1.460	15	give flexibility
KR-510	Methyl/phenyl	Methoxy	100	1.509	17	Forms a high hardness coating
KR-9218	Methyl/phenyl	Methoxy	40	1.529	15	Forms medium-hard coatings
KR-213	Methyl/phenyl	Methoxy	16	1.525	20	High phenyl type

application

(1) Organic resin modifier: The silanol group generated by hydrolysis of alkoxysilane or alkoxysilyl group is used to denature other organic resins into silicone, which can improve heat resistance and weather resistance. The reaction mechanism includes "dealcoholization condensation" of an alcoholic hydroxyl group contained in an organic resin and an alkoxysilyl group, and "dehydration condensation" with a silanol group. In addition, in general, methyl-based oligomers are used for water-based organic resins, and phenyl-based oligomers are used for solvent-based organic resins.

(2) Room temperature moisture curing coating agent

Two-component: A-type oligomer, which can be made into a room temperature moisture-curing coating agent by using a catalyst in combination, and is used in a wide range of fields such as automobile body coating and floor coating agent.

	Curing catalyst (addition amount)%	thickness μm	no stickiness 25°C min	pencil hardness	Flex/Shock Resistance
KR-500	D-20（2）	25	40	H	△
KR-500	D-20（4）	25	25	2H	△~X
KR-500	DX-9740（5）	25	100	5H	X
X-40-9225	D-20（3）	30	60	H	〇
KR-500/X-40-9250（=80/20）	D-20（2）	80	75	F	〇

〇：Excellent△：Slightly poor X：Poor

One-component (with catalyst type)

	organic substituent	Viscosity 25°C mm2/s	refractive index 25°C	no stickiness 25°C min	Pencil Hardness/Cure Days	Features
KR-400	methyl	1.2	1.390	30-60	5H/2→8H/7	Forms a high hardness coating
X-40-2327	methyl	0.9	1.382	5-10	5H/1	Fast-curing, recoatable coatings
KR-401	Methyl/phenyl	20	1.435	30-60	3H/7	Excellent bending resistance and impact resistance