CN112831207A - Single-component transparent hydrophobic protective coating and preparation method thereof - Google Patents

Abstract

The invention discloses a single-component transparent hydrophobic protective coating and a preparation method thereof, relating to the technical field of coatings. The single-component transparent hydrophobic protective coating provided by the invention comprises silicon resin, A171 vinyl trimethoxy silane, A151 vinyl triethoxy silane and isobutylene triethoxy silane. The single-component transparent hydrophobic protective coating provided by the invention is suitable for surfaces of public facilities and industrial devices, so that the surfaces of the public facilities and the industrial devices are prevented from being adhered by dust and oil stains in the environment, corroded by wind and rain, artificially polluted and the like, and the coating is transparent and does not change the surface appearance of the facilities. The single-component transparent hydrophobic protective coating provided by the invention has excellent heat resistance, cold resistance, moisture resistance, weather resistance, stain resistance, chemical corrosion resistance and other performances. The single-component transparent hydrophobic protective coating provided by the invention is a single-component system, is simple and feasible in preparation process, easy in raw material obtaining, beneficial to field construction, high in curing speed and free from surface sealing treatment.

Description

Single-component transparent hydrophobic protective coating and preparation method thereof

Technical Field

The invention relates to the technical field of coatings, in particular to a single-component transparent hydrophobic protective coating and a preparation method thereof.

Background

In recent years, with the development of economy, the progress of social infrastructure, municipal construction and the like is continuously accelerated, and the social and living environment of people is greatly improved. But at the same time, the ecological environment is seriously influenced by the environmental pollution caused by human activities such as industrial production, urban traffic and the like. Surfaces such as road facilities, traffic lights, city furniture, and building exterior walls are subject to dust and oil adhesion, weather erosion, and artificial pollution. According to statistics of relevant departments, nearly 50 parts of cities in China have more than moderate pollution, and 18 parts of cities have severe pollution. The investment of China in the aspect of urban appearance environmental sanitation is up to 1735 million yuan in 2017. Therefore, how to effectively solve the surface protection of public facilities and industrial devices becomes one of the major problems facing people. The surface coating of protective coatings is a method which is generally adopted at present, and particularly, silicone resin is one of protective coatings which are developed more rapidly in recent years. The Si-O bond energy in the organic silicon resin is also larger, and the organic silicon resin has the characteristics of small surface tension, low surface energy and the like, so that the coating has excellent hydrophobicity, and also has excellent heat resistance, cold resistance, moisture resistance, weather resistance, stain resistance, chemical corrosion resistance and the like.

However, the film forming property of the silicone resin is relatively poor, the curing temperature is relatively high, the adhesion to a substrate is poor, and the durability of the coating is poor. And the common protective film forming system can seal the surface of the substrate and make water vapor not penetrate through the substrate. Water in a humid environment for a long time may penetrate the damaged area, easily causing further damage.

Disclosure of Invention

The invention aims to provide a single-component transparent hydrophobic protective coating and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:

a one-component transparent hydrophobic protective coating comprising silicone, a171 vinyltrimethoxysilane, a151 vinyltriethoxysilane, and isobutylene triethoxysilane.

Preferably, the coating comprises the following components in parts by weight: 72-78 parts of silicone resin, 12-15 parts of A171 vinyltrimethoxysilane, 3-5 parts of A151 vinyltriethoxysilane and 5-6 parts of isobutene triethoxysilane.

Preferably, the coating further comprises a rare earth composite drier, a defoaming agent and a silane diluent.

Preferably, the coating further comprises the following components in parts by weight: 4-6 parts of rare earth composite drier, 0.2-0.4 part of defoaming agent and 5-10 parts of diluent.

The embodiment of the invention also provides a preparation method of the single-component transparent hydrophobic protective coating, which comprises the following steps:

s10, weighing 72-78 parts of silicone resin, 12-15 parts of A171 vinyltrimethoxysilane, 3-5 parts of A151 vinyltriethoxysilane and 5-6 parts of isobutene triethoxysilane according to parts by weight;

and S20, adding the mixture into a dispersing container, stirring and filtering to obtain the single-component transparent hydrophobic protective coating.

Preferably, step S20 is preceded by:

s11, weighing 4-6 parts of rare earth composite drier, 0.2-0.4 part of defoaming agent and 5-10 parts of diluent according to parts by weight.

Preferably, step S20 includes: dispersing for 15-25 minutes at the speed of 200-.

Compared with the prior art, the invention has the following beneficial effects:

(1) the single-component transparent hydrophobic protective coating provided by the invention is suitable for surfaces of public facilities and industrial devices, so that the surfaces of the public facilities and the industrial devices are prevented from being adhered by dust and oil stains in the environment, corroded by wind and rain, artificially polluted and the like, and the coating is transparent and does not change the surface appearance of the facilities.

(2) The single-component transparent hydrophobic protective coating provided by the invention has excellent heat resistance, cold resistance, moisture resistance, weather resistance, stain resistance, chemical corrosion resistance and other performances.

(3) The single-component transparent hydrophobic protective coating provided by the invention is a single-component system, is simple and feasible in preparation process, easy in raw material obtaining, beneficial to field construction, high in curing speed and free from surface sealing treatment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In specific examples, the starting materials are all commercially available.

The silicone resin is a thermosetting polysiloxane polymer with a highly cross-linked structure, has the dual characteristics of organic resin and inorganic materials, has unique physical and chemical properties, and has good electrical insulation property, temperature resistance and waterproof effect. The silicon resin has better weather resistance than common organic resin. Therefore, it is an ideal material for coating a surface layer protected by heat-resistant, heat-resistant and moisture-proof treatment. In the present example, BS290 silicone, wacker, germany, was used. Further, the defoamer and silane diluent used in the examples of the present invention were 102F defoamer and 1701 silane diluent, respectively. Among them, 102F defoamer is a defoamer model of dow corning corporation, which has the main components of methyl ethyl ketone and n-propyl acetate, and is used as a high-efficiency foam control agent for solvent-based coating systems. 1701 silane diluent is a silane model number from wacker, germany, is a mixture of octyltriethoxysilane isomers, has isooctyltriethoxysilane as the main component, and can be used in hydrophobic coatings to improve durability.

The vinyl trimethoxy silane is a silane coupling agent with wide application, has a molecular structure comprising one vinyl functional group with an unsaturated double bond structure and three hydrolyzable methoxyl groups, and has slightly good stability and difficult volatilization in a system. Can improve the mechanical property of the resin-based composite material and improve the bonding strength, water resistance and other properties of the resin coating.

A151 vinyl triethoxysilane, having the formula: CH (CH)₂＝CHSi(OC₂H₅)₃. Has the functions of both coupling agent and cross-linking agent, and is suitable for use in glass fiber, plastic, glass, cable, ceramic, rubber, etc.

A171 vinyltrimethoxysilane of the formula: CH (CH)₂＝CHSi(OCH₃)₃. The polyethylene and the copolymer are suitable for polyethylene and copolymers with various complex shapes and all densities, are suitable for composite materials with larger processing technology latitude and filling, and have higher use temperature, excellent pressure cracking resistance, memory, wear resistance and impact resistance. The silane coupling agent A171 can be grafted to the main chain of the polymer so as to modify polyethylene and other polymers, and the side chain of the polymer is provided with the lactone group which is used as an active point for warm water crosslinking. The grafted polyethylene can be made into shaped products such as cable jacketing and insulation, tubing or other extruded and molded articles, and the like.

It should be noted that: the single-component transparent hydrophobic protective coating provided by the invention can generate a small amount of low molecular alcohol in the reaction, and a proper ventilation system is considered to be used for treatment in the production process. The product container must be sealed to avoid long-term contact with air.

Example 1

Weighing 72 parts of BS290 silicon resin, 14 parts of A171 vinyltrimethoxysilane, 4 parts of A151 vinyltriethoxysilane, 5.5 parts of isobutylene triethoxysilane, 0.3 part of 102F defoaming agent, 4.7 parts of rare earth composite drier and 5 parts of 1701 silane diluent according to parts by weight, adding into a dispersing container, dispersing for 15 minutes at the speed of 200 revolutions per minute, and filtering by using a 150-mesh filter screen to obtain the single-component transparent hydrophobic protective coating.

Example 2

Weighing 76 parts by weight of BS290 silicon resin, 15 parts by weight of A171 vinyltrimethoxysilane, 5 parts by weight of A151 vinyltriethoxysilane, 6 parts by weight of isobutylene triethoxysilane, 0.4 part by weight of 102F defoamer, 6 parts by weight of rare earth composite drier and 8 parts by weight of 1701 silane diluent, adding into a dispersing container, dispersing for 20 minutes at the speed of 500 revolutions per minute, and filtering by using a 200-mesh filter screen to obtain the single-component transparent hydrophobic protective coating.

Example 3

Weighing 74 parts by weight of BS290 silicon resin, 12 parts by weight of A171 vinyltrimethoxysilane, 3 parts by weight of A151 vinyltriethoxysilane, 5 parts by weight of isobutylene triethoxysilane, 0.4 part by weight of 102F defoamer, 5 parts by weight of rare earth composite drier and 10 parts by weight of 1701 silane diluent, adding into a dispersing container, dispersing for 25 minutes at the speed of 400 revolutions per minute, and filtering by using a 100-mesh filter screen to obtain the single-component transparent hydrophobic protective coating.

The coating formulation was tested for properties and the specific properties of the coating are shown in table 1.

Table 1 paint performance test tables formulated in examples 1-3

The results show that the single-component transparent hydrophobic protective coating prepared in the embodiments 1 to 3 has excellent heat resistance, cold resistance, humidity resistance, weather resistance, stain resistance, chemical corrosion resistance and other performances, is high in curing speed, is suitable for surfaces of public facilities and industrial devices, prevents dust and oil stain adhesion in the environment, erosion of wind and rain, artificial stains and the like, is transparent, and does not change the surface appearance of the facilities.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (7)

1. A single-component transparent hydrophobic protective coating is characterized by comprising silicon resin, A171 vinyl trimethoxy silane, A151 vinyl triethoxy silane and isobutylene triethoxy silane.

2. The one-component transparent hydrophobic protective coating of claim 1, comprising the following components in parts by weight: 72-78 parts of silicone resin, 12-15 parts of A171 vinyltrimethoxysilane, 3-5 parts of A151 vinyltriethoxysilane and 5-6 parts of isobutene triethoxysilane.

3. The one-component transparent hydrophobic protective coating of claim 1, further comprising a rare earth complex drier, a defoamer, and a silane diluent.

4. The one-component transparent hydrophobic protective coating of claim 1, further comprising the following components in parts by weight: 4-6 parts of rare earth composite drier, 0.2-0.4 part of defoaming agent and 5-10 parts of diluent.

5. A preparation method of a single-component transparent hydrophobic protective coating is characterized by comprising the following steps:

s10, weighing 72-78 parts of silicone resin, 12-15 parts of A171 vinyltrimethoxysilane, 3-5 parts of A151 vinyltriethoxysilane and 5-6 parts of isobutene triethoxysilane according to parts by weight;

and S20, adding the mixture into a dispersing container, stirring and filtering to obtain the single-component transparent hydrophobic protective coating.

6. The method of claim 5, further comprising the step of prior to step S20:

s11, weighing 4-6 parts of rare earth composite drier, 0.2-0.4 part of defoaming agent and 5-10 parts of diluent according to parts by weight.

7. The method of claim 5, wherein step S20 includes: dispersing for 15-25 minutes at the speed of 200-.