X-48-1800 is a silicone oligomer for cold blending with acrylic resins.
X-48-1800 can be cold blended with silicone modified acrylic polymers to further improve the silicone concentration in the coating.
The addition of X-48-1800 improves various coating performances, especially weatherability, heat resistance, and anti-marking pen fouling properties.
The recommended additive amount is 10 to 50 parts by weight for 100 parts by weight of the base acrylic resin. For details, please refer to the paint formulation examples.
The applicable resins are silicone-modified acrylic polymers, polyesters, and alkyds.
It can be applied to room temperature curing and forced drying paints for metals, woods and plastics.
And it can also be applied to inks and other coatings.

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Frequently Asked Questions about X-48-1800

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Paint Formulation Example

Mill Base Process (PWC* : 70%)

Formulation	Content	Formulation amount (parts)
Acrylic silicone polymer	Made by Kaneka Corporation ZEMLAC AM-1532	60
Titanium dioxide white pigment	Made by Ishihara Sangyo Co. TIPAQUE CR-90	70
Dilution solvent	Thinner	10

*PWC : Pigment Weight Concentration

Pigmentation Process

Formulation	Content	Blank	X-48-1800 (30%)
Mill base	Mill base above	70	70
Acrylic silicone-based polymer	ZEMLAC YC-5920 (NV.50%)	100	60
Silicone oligomer	X-48-1800 made by Shin-Etsu Chemical Co., Ltd.	–	20
Curing agent for ZEMLAC	BT-120S* made by Kaneka Corporation	20	20
Leveling agent	Leveling Agent A made by Shin-Etsu Chemical Co., Ltd.	0.2	0.2
Dilution solvent	Thinner	10	10
	Total	200	180
	PWC (pigment weight concentration) %	35	35
	Acrylic/X-48-1800 (solids weight)	100/0	70/30

*Other catalysts (e.g. organotin-based) can also be used.

Characteristics of the Cured Coating Films

Curing conditions: room temperature x 1 week, film thickness 30 μm

Item	Blank	X-48-1800(30%)
PWC(Pigment Weight Concentration)%	35	35
■Mechanical properties
Gloss 60° *1	90	90
Pencil hardness *2	2H	2H
Adhesion (grid test) polished steel plate *2	100 / 100	100 / 100
Impact resistance 500g・cm *2	15	15
Flexibility mm *2	10<	10<
■Warm water resistance 40°C x 5days *1
Appearance	Excellent	Excellent
■Oil repellency 23°C×3h *1
Red	Good	Excellent
Blue	Good	Excellent
Black	Good	Excellent
■Acid and alkali resistance 23°C×5days *1
5% NaOH	Poor	Excellent
5% HCl	Poor	Excellent
■Heat resistance 200°C×4h. *1
Gloss retention ratio % 60°	84	88
Yellowing degree(ΔYI)	17	12
■Weather resistance SUV 30 cycle *3
Gloss retention ratio %	70(Cracking)	70
Xenon weather meter(500 h)	80(Peeling)	90

*1: Schott D263 glass sheet, *2: JIS,G,3141(SPCC-SD)PB-N144 zinc phosphate treated steel sheet, *3: Polyester coated steel sheet

Acid and Alkali Resistance Test

A spot test was conducted using a 5% hydrochloric acid solution and a 5% NaOH solution.
The appearance of the films was visually evaluated after standing for 5 days respectively.
It can be seen that the addition of X-48-1800 improves both the acid resistance and alkali resistance.

Formulation: P.W.C 35% (CR-90), Coating: film thickness 30μm, Substrate: glass

Anti-marking Pen Fouling Properties

After drawing a line with an oil-based pen and leaving it for 3 hours, the stain was removed with
Then, we evaluated whether it can be wiped off with Bencot M-3II (Asahi Kasei Corporation) soaked in a mixture of ethanol and toluene (1:1). The results were evaluated to see if they could be wiped off.
It can be seen that the addition of X-48-1800 sufficiently wipes off the ink compared to the blank.

Formulation: P.W.C 35% (CR-90), Coating: Film thickness 30μm, Substrate: Glass

Heat Resistance

Heat resistance tests were conducted under heating conditions of 200°C.
The film thickness was approximately 30 μm, and a glass plate was used as the test specimen, and the gloss and color difference at each heating time were evaluated.
It can be seen that the addition of X-48-1800 increases the gloss retention rate and suppresses yellowing.

Formulation: P.W.C. 35% (CR-90), Coating: Film thickness 30μm, Substrate: Glass, Temperature: 200°C

Coating Film Appearance after 200°C x 20 Hours

Weather Resistance

Accelerated weathering tests were conducted using a super accelerated weathering tester (Eye Super UV Tester SUV-W151 made by Iwasaki Electric Co., Ltd.) and a xenon weather meter (Q-SUN Xe-3 Xenon Test Chamber made by Q-Lab. Corporation).
After each accelerated test, the gloss and appearance of the coating film were evaluated.　
It can be seen that the addition of X-48-1800 increases the gloss retention rate and suppresses cracking and flaking.

SUV Test (10cycle = 1 Year Equivalent)

Thickness: 30 μm, Substrate: Polyester coated steel sheet

*1 cycle: UV (90mW) irradiation for 4 hours → dark for 4 hours → condensation for 4 hours

Xenon Weather Meter Test (Equivalent to 1000h=1 Year)

	Gloss retention ratio %
X-48-1800(30%)	90
Blank	80

Thickness: 30μm, Substrate: Polyester coated steel sheet

Xenon weather meter 500h later

*1h (irradiation) -> 1h (condensation/irradiation) -> 1h (condensation)

Thickness: 30μm, Substrate: polyester coated steel plate, Appearance after 1000h in xenon weather meter

Frequently Asked Questions

Question: About X-48-1800	Answer
1.What is X-48-1800?	It is a silicone oligomer with excellent compatibility with organic resins and reactivity in resins.
2.How to use?	Cold blending will modify the resin. It is especially effective for silicone modified resins. We recommend cold blending with silicone-modified acrylic resins as shown in the Paint Formulation Example on this webpage.
3.What is the curing mechanism?	A hydrolysis reaction with the alkoxysilane in the acrylic resin forms a siloxane bond.
4.What should I pay attention to when blending?	Make sure that the product is compatible with the resin. If the paint film becomes slightly cloudy or whitish, it will be difficult to get good performance.
5.Does it have water repellency?	It is slightly inferior to silicone fluid, but it will maintain its water repellency.
6.What if the water repellency is insufficient?	It is possible to improve the water repellency by adding 1000ppm to several percent of carbinol-modified fluorine-containing silicone(i.e. X-48-7014), or modified silicone fluid.
7.What should I do for the actual formulation?	Please refer to the Paint Formulation Example on this web page.
8.What is the storage stability of X-48-1800?	Seal container tightly and store in a cool, dark place (25℃ or below, out of direct sunlight) with good ventilation. Keep away from heat and flame. After use, be sure to seal tightly to prevent moisture and humidity from entering the product.
Question: About compatibility	Answer
1.What are the acrylic resins that are easily compatible?	Silicone modified resins are easily compatible with each other. Even unmodified resins can be used to the extent that they are compatible.
2.What is the compatibility with resins other than acrylics?	Silicone modified resins such as silicone modified alkyd resins and silicone modified polyester resins are more compatible. The same effect can be expected with unmodified silicone resins if they are compatible.
Question: About compounding	Answer
1.What kind of resin do you recommend to use for mill base (MB)?	The Gemlac AM-1532 (made by Kaneka corporation) which is a pigment dispersion resin is recommended. Also, any other resins with good dispersibility can be used.
2.In the example of paint formulation, pigments are used, but what is the recommended formulation for clear paints?	Mix resin/X-48-1800 (solids weight ratio) = 70/30, add reaction catalyst and leveling agent if necessary. For the reaction catalyst, a general condensation curing catalyst (e.g. organotin) can be added at 0.05-2% to provide good curing properties.
3.Is it possible to increase the dosage of X-48-1800?	If it is compatible, it is possible.
4.What will be changed by increasing X-48-1800?	The more it is increased, the better the weatherability, heat resistance and anti-marking pen fouling properties.
5.What is the minimum amount of X-48-1800 that will be effective?	The minimum amount is about resin/X-48-1800 (solids weight ratio) = 80/20. It depends on the type and structure of the resin.
6.What is the recommended dilution solvent?	Single or multiple mixed solvents such as butyl acetate, ethyl acetate, MEK, MIBK, toluene, xylene, and alcohols.
7. Does it need a catalyst?	Yes, it is necessary.
8.Which catalyst can be recommended except organo-tin catalyst ?	DX-9740 (aluminum catalyst made by Shin-Etsu Chemical Co., Ltd.), etc.
9.What is the stability of the blended paint?	If the catalyst is not included, it is relatively stable. Also, depending on the type of resin, it can be applied within a day or two after the catalyst is added.
Question: About coating	Answer
1.What are the drying conditions?	Dry at room temperature (20℃~25℃) for 1 week. Or, forced drying (80℃ x 20 minutes) + 1 day of drying at room temperature is the guideline.
2.What if uncured components remain on the surface of the cured film?	It is possible that the catalyst amount is too high. The problem may be solved by examining the amount of catalyst. In addition, forced drying by heating is likely to cause this kind of issue, and it may be solved by using room temperature curing.
3.Which coating methods are possible?	You can follow the normal coating methods such as spray, roll coater, flow coater, etc.
4.What are the precautions for paint storage?	Please refer to answer 8 about X-48-1800
5.What is the film thickness?	Not specific, but in the range 5μm to 100μm.
6.What substrates can be coated?	Metals, non-ferrous metals, glass, inorganic materials, plastics, and wood. The surface of the substrate should be degreased or otherwise cleaned before application.
Question: About the application	Answer
What are the expected uses?	・Top coat for woods ・Top coat for plastics ・Topcoat for inorganic construction materials ・Elastic top coat ・Topcoat for waterproof materials ・Top coat for metals (iron, aluminum, stainless steel) ・Primer for photocatalytic layer