阅读说明：本技术 一种用于铝模板的表面涂料及其制备方法与应用方法 (Surface coating for aluminum template and preparation method and application method thereof ) 是由 唐华强 于 2020-12-11 设计创作，主要内容包括：本发明涉及铝模板表面涂料技术领域,尤其涉及一种用于铝模板的表面涂料及其制备方法与应用方法,包括以下重量份数的原料：包括以下重量份数的原料：乙酸乙酯100-200份、改性环氧树脂100-200份、有机硅树脂50-100份、氧化铝粉20-40份、分散剂10-30份、流平剂10-15份、硅油10-20份、有机硅消泡剂5-10份、二丙二醇丁醚5-10份、固化剂10-20份。本发明表面涂料可以隔绝混凝土与铝模板发生化学反应,对铝模板表面起到很好的保护效果,可提高墙面的光滑度,易于铝模板的清洗和重复利用提高了铝模板的使用次数。(The invention relates to the technical field of surface coatings of aluminum templates, in particular to a surface coating for an aluminum template, a preparation method and an application method thereof, wherein the surface coating comprises the following raw materials in parts by weight: the composite material comprises the following raw materials in parts by weight: 100-200 parts of ethyl acetate, 100-200 parts of modified epoxy resin, 50-100 parts of organic silicon resin, 20-40 parts of alumina powder, 10-30 parts of dispersing agent, 10-15 parts of flatting agent, 10-20 parts of silicone oil, 5-10 parts of organic silicon defoamer, 5-10 parts of dipropylene glycol butyl ether and 10-20 parts of curing agent. The surface coating disclosed by the invention can isolate the chemical reaction between concrete and the aluminum template, has a good protection effect on the surface of the aluminum template, can improve the smoothness of the wall surface, is easy to clean and recycle the aluminum template, and improves the use times of the aluminum template.)

1. The surface coating for the aluminum template is characterized by comprising the following raw materials in parts by weight: 100-200 parts of ethyl acetate, 100-200 parts of modified epoxy resin, 50-100 parts of organic silicon resin, 20-40 parts of alumina powder, 10-30 parts of dispersing agent, 10-15 parts of flatting agent, 10-20 parts of silicone oil, 5-10 parts of organic silicon defoamer, 5-10 parts of dipropylene glycol butyl ether and 10-20 parts of curing agent.

2. The surface coating for the aluminum template as recited in claim 1, wherein the dispersant is one of ethanol, ethylene glycol and polyethylene glycol.

3. The surface coating for the aluminum template as recited in claim 2, wherein the alumina powder has an average particle diameter of 10-20nm, a specific surface area of 5-30m2/g, and a crystal form of spherical.

4. The surface coating for the aluminum template as recited in claim 3, wherein the leveling agent is one of polydimethylsiloxane, polyether polyester modified organosiloxane and alkyl modified organosiloxane.

5. The surface coating for the aluminum template as recited in claim 4, wherein the silicone oil is one of methyl silicone oil, ethyl silicone oil, phenyl silicone oil and hydroxyl hydrogen-containing silicone oil.

6. The surface coating for the aluminum template as recited in claim 5, wherein the curing agent is an epoxy curing agent.

7. The method for preparing the surface coating for the aluminum template according to claim 6, characterized by comprising the following steps:

pouring ethyl acetate into a reaction kettle, starting a stirring device, adding the modified epoxy resin, the organic silicon resin, the silicone oil, the alumina powder and the dispersing agent into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the materials are completely dissolved; and adjusting the temperature of the reaction kettle to 35-50 ℃, adding the flatting agent, the organic silicon defoamer, the dipropylene glycol butyl ether and the curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain the surface coating.

8. The method for preparing the surface coating for the aluminum template according to claim 7, wherein the modified epoxy resin is prepared by the following steps: adding silica nanoparticles into an acetone solution, adding a coupling agent, carrying out ultrasonic treatment for 20min, then uniformly stirring and mixing the solution and epoxy resin, then heating to 120 ℃, reacting the coupling agent with the epoxy resin and the silica nanoparticles for 60min, cooling, and adding a curing agent to obtain the modified epoxy resin.

9. The method for preparing the surface coating for the aluminum template according to claim 8, wherein the dispersing agent is polyethylene glycol, the leveling agent is polydimethylsiloxane, and the silicone oil is methyl silicone oil.

10. The method for applying the surface coating to the aluminum template as claimed in claim 9, wherein the aluminum template is pre-treated when the surface coating is applied to the aluminum template, the surface coating is uniformly attached to the aluminum template by spraying or roll coating, the aluminum template is kept still for 10-30min so that the surface coating is automatically leveled on the surface of the aluminum template, and then the aluminum template coated with the surface coating is dried at 60-80 ℃ so that the surface coating is cured and a protective coating is formed on the surface of the aluminum template.

Technical Field

The invention relates to the technical field of surface coatings of aluminum templates, in particular to a surface coating for an aluminum template and a preparation method and an application method thereof.

Background

In recent years, aluminum templates are widely used, the aluminum templates are all called as building aluminum alloy template systems, the aluminum templates are the next-generation novel template supporting systems appearing after the bamboo templates and the steel templates, and the aluminum templates have the following advantages: (1) the construction period is short: one set of template can reach one layer in four or five days in normal construction. (2) The repeated use times are many, and the average use cost is low. (3) The concrete surface after the form removal is effectual: after the aluminum alloy building template is demolded, the surface of the concrete is flat and smooth, and the requirements of a veneer and fair-faced concrete can be basically met. (4) The recovery value is high: after the aluminum alloy building template is scrapped, the waste treatment residue is high. (5) The method conforms to the national industrial policy of replacing steel with aluminum and replacing wood with aluminum.

However, in the actual use process, some challenges are brought, because the concrete has extremely strong alkalinity, the part of the aluminum template, which is in contact with the concrete, is easily corroded by the concrete, after the concrete is used for several times, the formed wall surface has serious roughness, the appearance of the wall body is influenced, the wall body needs to be repaired for the second time when the wall body is serious, and meanwhile, the aluminum template is not beneficial to being detached from the formed wall body. In addition, with the use of the aluminum template, the corrosion position of the part of the aluminum template contacted with the concrete can be increased, and the corroded area can be larger and larger, so that the recycling of the aluminum template is influenced. Therefore, the surface of the aluminum template must be protected by coating, the isolation concrete and the aluminum template are subjected to chemical reaction, and the smoothness of the wall surface and the use times of the aluminum template are improved.

Disclosure of Invention

In view of the above, the present invention provides a surface coating for an aluminum formwork, a preparation method and an application method thereof, wherein the surface coating can isolate chemical reaction between concrete and the aluminum formwork, has a good protection effect on the surface of the aluminum formwork, and can improve smoothness of a wall surface and use times of the aluminum formwork.

The invention solves the technical problems by the following technical means:

the surface coating for the aluminum template comprises the following raw materials in parts by weight:

100-200 parts of ethyl acetate, 100-200 parts of modified epoxy resin, 50-100 parts of organic silicon resin, 20-40 parts of alumina powder, 10-30 parts of dispersing agent, 10-15 parts of flatting agent, 10-20 parts of silicone oil, 5-10 parts of organic silicon defoamer, 5-10 parts of dipropylene glycol butyl ether and 10-20 parts of curing agent.

Further, the dispersant is one of ethanol, ethylene glycol and polyethylene glycol.

Further, the average particle diameter of the alumina powder is 10-20nm, and the specific surface areaIs 5-30m²The crystal form is spherical, and the silicon oil is difficult to disperse in the raw material, while the aluminum oxide powder can better disperse the silicon oil, so that the silicon oil can embody the performance in the surface coating.

Further, the leveling agent is one of polydimethylsiloxane, polyether polyester modified organic siloxane and alkyl modified organic siloxane.

Further, the silicone oil is one of methyl silicone oil, ethyl silicone oil, phenyl silicone oil and hydroxyl hydrogen-containing silicone oil.

Further, the curing agent is an epoxy curing agent.

The invention also discloses a preparation method of the surface coating for the aluminum template, which comprises the following preparation steps:

pouring ethyl acetate into a reaction kettle, starting a stirring device, adding the modified epoxy resin, the organic silicon resin, the silicone oil, the alumina powder and the dispersing agent into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the materials are completely dissolved; and adjusting the temperature of the reaction kettle to 35-50 ℃, adding the flatting agent, the organic silicon defoamer, the dipropylene glycol butyl ether and the curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain a mixed solution of the surface coating.

Further, the preparation method of the modified epoxy resin comprises the following steps: adding silica nanoparticles into an acetone solution, adding a coupling agent, carrying out ultrasonic treatment for 20min, then uniformly stirring and mixing the solution and epoxy resin, then heating to 120 ℃, reacting the coupling agent with the epoxy resin and the silica nanoparticles for 60min, cooling, and adding a curing agent to obtain the modified epoxy resin.

Further, when the surface coating is prepared, the dispersing agent is polyethylene glycol, the flatting agent is polydimethylsiloxane, and the silicone oil is methyl silicone oil.

Further, when the surface coating is applied to the aluminum template, the aluminum template needs to be pretreated, then the surface coating is uniformly attached to the aluminum template in a spraying or rolling coating mode, standing is carried out for 10-30min to enable the surface coating to be automatically leveled on the surface of the aluminum template, and then the aluminum template coated with the surface coating is dried at the temperature of 60-80 ℃, so that the surface coating is cured and a protective coating is formed on the surface of the aluminum template.

The invention has the beneficial effects that:

1. the modified epoxy resin adopted by the invention is silicon dioxide nano particle toughened epoxy resin, the silicon dioxide nano particles have extremely high specific surface area, when the particle toughened epoxy resin is utilized, an epoxy group and the nano particles form a force far greater than the action force of Van der Waals force on an interface, and the bonding performance of the epoxy group and the nano particles is good, so that the epoxy resin can play a role in absorbing impact energy when impacted, thereby achieving the purpose of toughening.

2. The organic silicon resin has excellent water resistance and low surface tension, the water resistance of the surface coating is improved, a coating layer which is contacted with water for a long time is prevented from being permeated into the coating layer by water, and the damage of the coating layer by water is avoided; meanwhile, the surface tension of the coating is reduced, so that the concrete is not easy to adhere to the surface of the coating, the aluminum template is easy to clean and reuse, and the smoothness of the wall surface and the use times of the aluminum template are improved.

3. The silicon oil has good hydrophobic property and low surface tension, reduces the adhesion of water on the surface of the coating, avoids the damage of the coating by water, is difficult to disperse in raw materials, and in order to ensure that the silicon oil can be fully dispersed, the invention uses the alumina with the median particle size of 10-15nm, and aims to disperse the silicon oil, the uniformly dispersed silicon oil reduces the surface tension of the coating, and can ensure that the coating is cleaner and smoother, so that concrete is difficult to adhere to the surface of the coating, the aluminum template is easy to clean and recycle, and the use times of the aluminum template are improved.

4. The dipropylene glycol butyl ether has two functional groups of alcohol and ether at the same time, can be coupled with different phases, can be mixed and dissolved with a plurality of hydrophilic and hydrophobic solvents, is a good film-forming aid, has unique hydrophilic and lipophilic balance to improve the film-forming effect of the alcohol ether by 20 to 30 percent, and has good synergistic effect with the leveling agent.

Detailed Description

The present invention will be described in detail with reference to specific examples below:

the first embodiment is as follows: preparation of modified epoxy resin

Adding silica nanoparticles into an acetone solution, adding a coupling agent, carrying out ultrasonic treatment for 20min, then uniformly stirring and mixing the solution and epoxy resin, then heating to 120 ℃, reacting the coupling agent with the epoxy resin and the silica nanoparticles for 60min, cooling, and adding a curing agent to obtain the modified epoxy resin.

Example two: preparation of surface coating

100 parts of ethyl acetate, 100 parts of modified epoxy resin, 50 parts of organic silicon resin, 20 parts of alumina powder, 10 parts of polyethylene glycol, 10 parts of polydimethylsiloxane, 10 parts of methyl silicone oil, 5 parts of organic silicon defoamer, 5 parts of dipropylene glycol butyl ether and 20 parts of epoxy curing agent, wherein the average particle size of the alumina powder is 10nm, and the specific surface area is 5m²The crystal form is spherical.

Pouring ethyl acetate into a reaction kettle, starting a stirring device, adding modified epoxy resin, organic silicon resin, methyl silicone oil, alumina powder and polyethylene glycol into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the ethyl acetate is completely dissolved; adjusting the temperature of the reaction kettle to 35-50 ℃, adding polydimethylsiloxane, an organic silicon defoamer, dipropylene glycol butyl ether and an epoxy curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain the surface coating.

Example three: preparation of surface coating

100 parts of ethyl acetate, 150 parts of modified epoxy resin, 50 parts of organic silicon resin, 20 parts of alumina powder, 20 parts of polyethylene glycol, 15 parts of polydimethylsiloxane, 10 parts of methyl silicone oil, 5 parts of organic silicon defoamer, 10 parts of dipropylene glycol butyl ether and 10 parts of epoxy curing agent, wherein the average particle size of the alumina powder is 10nm, and the specific surface area is 5m²The crystal form is spherical.

Pouring ethyl acetate into a reaction kettle, starting a stirring device, adding modified epoxy resin, organic silicon resin, methyl silicone oil, alumina powder and polyethylene glycol into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the ethyl acetate is completely dissolved; adjusting the temperature of the reaction kettle to 35-50 ℃, adding polydimethylsiloxane, an organic silicon defoamer, dipropylene glycol butyl ether and an epoxy curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain the surface coating.

Example four: preparation of surface coating

150 parts of ethyl acetate, 100 parts of modified epoxy resin, 75 parts of organic silicon resin, 20 parts of alumina powder, 20 parts of polyethylene glycol, 10 parts of polydimethylsiloxane, 15 parts of methyl silicone oil, 8 parts of organic silicon defoamer, 5 parts of dipropylene glycol butyl ether and 10 parts of epoxy curing agent, wherein the average particle size of the alumina powder is 15nm, and the specific surface area is 20m²The crystal form is spherical.

Pouring ethyl acetate into a reaction kettle, starting a stirring device, adding modified epoxy resin, organic silicon resin, methyl silicone oil, alumina powder and polyethylene glycol into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the ethyl acetate is completely dissolved; adjusting the temperature of the reaction kettle to 35-50 ℃, adding polydimethylsiloxane, an organic silicon defoamer, dipropylene glycol butyl ether and an epoxy curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain the surface coating.

Example five: preparation of surface coating

150 parts of ethyl acetate, 200 parts of modified epoxy resin, 100 parts of organic silicon resin, 30 parts of alumina powder, 20 parts of polyethylene glycol, 10 parts of polydimethylsiloxane, 15 parts of methyl silicone oil, 10 parts of organic silicon defoamer, 5 parts of dipropylene glycol butyl ether and 15 parts of epoxy curing agent, wherein the average particle size of the alumina powder is 15nm, and the specific surface area is 20m²The crystal form is spherical.

Pouring ethyl acetate into a reaction kettle, starting a stirring device, adding modified epoxy resin, organic silicon resin, methyl silicone oil, alumina powder and polyethylene glycol into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the ethyl acetate is completely dissolved; adjusting the temperature of the reaction kettle to 35-50 ℃, adding polydimethylsiloxane, an organic silicon defoamer, dipropylene glycol butyl ether and an epoxy curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain the surface coating.

Example six: preparation of the surface coating composition

200 parts of ethyl acetate, 2000 parts of modified epoxy resin, 100 parts of organic silicon resin, 40 parts of alumina powder, 30 parts of polyethylene glycol, 10 parts of polydimethylsiloxane, 10 parts of methyl silicone oil, 10 parts of organic silicon defoamer, 5 parts of dipropylene glycol butyl ether and 10 parts of epoxy curing agent, wherein the average particle size of the alumina powder is 15nm, and the specific surface area is 30m²The crystal form is spherical.

Pouring ethyl acetate into a reaction kettle, starting a stirring device, adding modified epoxy resin, organic silicon resin, methyl silicone oil, alumina powder and polyethylene glycol into the reaction kettle at a stirring speed of 100r/min for 5min, adjusting the stirring speed to 450r/min, and stirring for 10min until the ethyl acetate is completely dissolved; adjusting the temperature of the reaction kettle to 35-50 ℃, adding polydimethylsiloxane, an organic silicon defoamer, dipropylene glycol butyl ether and an epoxy curing agent, and stirring at the rotating speed of 300r/min for 10-15min to obtain the surface coating.

Example seven: method for applying surface coating

The method comprises the steps of pretreating an aluminum template, uniformly attaching a surface coating to the aluminum template in a roll coating mode, standing for 10-30min to enable the surface coating to be automatically leveled on the surface of the aluminum template, and drying the aluminum template coated with the surface coating at the temperature of 60-80 ℃ to enable the surface coating to be cured and form a protective coating on the surface of the aluminum template.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.