Inorganic coating composition which can be cured at low temperature and a preparation method thereof

• US 10,081,731 B2
• Filed: 07/05/2016
• Issued: 09/25/2018
• Est. Priority Date: 07/08/2015
• Status: Active Grant

• Current Assignee: Xiaodong Liu
• Original Assignee: Xiaodong Liu
• Inventors: Liu, Xiaodong
• Primary Examiner(s): Qian, Yun
• Application Number:
  US15/202,238
• Publication Number:
  US 20170009079A1
• Time in Patent Office: 812 Days
• Field of Search: None
• CPC Class Codes: C08G 77/18 to alkoxy or aryloxy groups
• CPC Class Codes: C08K 3/10 Metal compounds
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: C09D 1/02 alkali metal silicates
• CPC Class Codes: C09D 1/04 with organic additives
• CPC Class Codes: C09D 183/00 Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09D 183/02 Polysilicates
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes

Abstract

The present invention relates to coating composition. And in particular, to an inorganic coating composition which can be cured at low temperature and a preparation method thereof. In order to solve the problems that the organic coating is harmful for the environment, the inorganic coating has bad flexibility, and the traditional ceramic coatings need heat and is inconvenient for curing in prior art, the present invention provide an inorganic coating composition which can be cured at low temperature and a preparation method thereof. The inorganic coating composition comprises the ingredient as below: 70-80 wt % of inorganic solution; 5-10 wt % of functional additives, which are potassium titanate, alumina, or a compound thereof; 10-20 wt % of inorganic pigment; 0.5-2.0 wt % of other functional additives. The said inorganic solution comprises the following ingredients: 30-40 wt % of organic alkoxy-silane, 15-20 wt % of organic solvent, and 25-30 wt % of silica sol. The inorganic coating composition is able to be cured at low temperature, the film formed by it has excellent flexibility, and the film will not release harmful organic gases, and is beneficial to the environmental.

Claims

1. An inorganic coating composition which is curable at low temperature,

wherein the inorganic coating composition comprises:

70-80 wt % inorganic solution, wherein the inorganic solution comprises 30-40 wt % organic alkoxy-silane, 15-20 wt % organic solvent, and 25-30 wt % silica sol;

5-10 wt % first functional additive selected from potassium titanate, alumina, or mixture thereof;

10-20 wt % inorganic pigment; and

0.5-2.0 wt % other functional additive selected from tourmaline, rare-earth ore, or a mixture thereof;

wherein

the organic alkoxy-silane is represented by formula R¹_mSi(OR²)_4-m, where R¹ and R² represent a substituted or non-substituted alkyl group or aryl group comprising 1-10 carbon atoms, where m is 0-3;

R¹ or R² are at least one selected from the group including methyl, ethyl, phenyl, CF₃CH₂CH₂, CF₃(CF₂)₅CH₂CH₂, and CF₃(CF₂)₇CH₂CH₂, and alternatively wherein

R¹ and R² are at least one of selected from the group including methyl, ethyl, phenyl, CF₃CH₂CH₂, CF₃(CF₂)₅CH₂CH₂, and CF₃(CF₂)₇CH₂CH₂.

2. The inorganic coating composition of claim 1, wherein the silica sol comprises 20-40 wt % silica (SO₂) particles, a size of the silica particle is from nanometer-size to micron-size.

3. The inorganic coating composition of claim 1, wherein the first functional additive comprises 3-5 wt % potassium titanate, the potassium titanate is needle-shaped with a particle size of 1-100 nm.

4. The inorganic coating composition of claim 1, wherein the organic alkoxy-silane is methyl trimethoxy silane, tetraethoxysilane, phenyl, trimethoxy silane or a mixture thereof;

and the organic solvent is methanol, ethanol, isopropanol or a mixture thereof.

5. The inorganic coating composition of claim 1, wherein the ingredients of the inorganic coating composition are treated by ultrasonic waves.

6. The inorganic coating composition of claim 5, wherein, a frequency of the ultrasonic waves is equal or more than 20 KHz, and the time for treating is 30-40 minutes.

7. The inorganic coating composition of claim 5, wherein the ultrasonic waves are used to treat the mixture of the organic alkoxy-silane and the silica sol during a mixing and reacting step of the organic alkoxy-silane and the silica sol.

8. The method for preparing the inorganic coating composition of claim 1, wherein the method comprises the following steps:

(1) preparing the inorganic solution;

mixing the 30-40 wt % organic alkoxy-silane, with the 15-20 wt % organic solvent, and 25-30% silica sol; and

stirring the mixture at 40-50 degrees Celsius for 5-10 minutes to get inorganic solution in sol state;

(2) preparing the inorganic coating mixture;

putting 70-80 wt % the inorganic solution generated in step (1), 5-10 wt % functional additives, 10-20 wt % inorganic pigment, and 0.5-2.0 wt % other functional additives together; and

stirring the mixture to get the inorganic coating mixture;

(3) placing the inorganic coating mixture generated in step (2) in a homogenizer; and

stirring it at a speed sufficient for homogenization for 1-2 hours to make the particles homogenized; and

(4) filtering the homogenized matter generated in step (3) pass through a 325-1000 mesh net to remove bigger particles; and

obtaining the inorganic coating composition which is curable at a temperature between 10-40 degrees Celsius.