阅读说明：本技术 一种用于高强度螺母的表面处理剂及其制备方法 (Surface treating agent for high-strength nut and preparation method thereof ) 是由 汪豪豪 曾晖 张楠楠 陈元 杨照军 于 2020-04-21 设计创作，主要内容包括：本发明公开了一种用于高强度螺母的表面处理剂,其原料按重量份包括：三聚磷酸铝2-5份,有机硅4-8份,表面去污剂2-4份,酸洗钝化剂6-12份,消泡剂0.2-1份,表面活化剂0.2-1份,固化剂0.2-0.6份,助剂2-4份,有机溶剂20-30份,去离子水5-15份。本发明公开了上述用于高强度螺母的表面处理剂制备方法。本发明公开了上述用于高强度螺母的表面处理剂使用方法。本发明稳定性好,使用方便,同时可除去高强度螺母表面杂质,环保、安全、有效地对螺母进行表面处理,可在螺母表面形成光亮表面,经过磷化与固化成膜后,附着强度极高,相较于镀锌处理,浸涂工艺更加简单,可有效降低生产成本。(The invention discloses a surface treating agent for a high-strength nut, which comprises the following raw materials in parts by weight: 2-5 parts of aluminum tripolyphosphate, 4-8 parts of organic silicon, 2-4 parts of a surface detergent, 6-12 parts of an acid pickling passivator, 0.2-1 part of a defoaming agent, 0.2-1 part of a surfactant, 0.2-0.6 part of a curing agent, 2-4 parts of an auxiliary agent, 20-30 parts of an organic solvent and 5-15 parts of deionized water. The invention discloses a preparation method of the surface treating agent for the high-strength nut. The invention discloses a use method of the surface treatment agent for the high-strength nut. The invention has good stability and convenient use, can remove impurities on the surface of the high-strength nut, is environment-friendly, safe and effective in surface treatment of the nut, can form a bright surface on the surface of the nut, has extremely high adhesive strength after phosphorization and curing film formation, is simpler in dip-coating process compared with galvanizing treatment, and can effectively reduce the production cost.)

1. A surface treating agent for a high-strength nut is characterized by comprising the following raw materials in parts by weight: 2-5 parts of aluminum tripolyphosphate, 4-8 parts of organic silicon, 2-4 parts of a surface detergent, 6-12 parts of an acid pickling passivator, 0.2-1 part of a defoaming agent, 0.2-1 part of a surfactant, 0.2-0.6 part of a curing agent, 2-4 parts of an auxiliary agent, 20-30 parts of an organic solvent and 5-15 parts of deionized water.

2. The surface treatment agent for high-strength nuts according to claim 1, wherein the silicone is γ -aminopropyltriethoxysilane and/or silica sol.

3. The surface treatment agent for a high-strength nut as claimed in claim 1, wherein the silicone comprises: gamma-aminopropyltriethoxysilane and silica sol, wherein the mass ratio of the gamma-aminopropyltriethoxysilane to the silica sol is 2-6: 1-2.

4. The surface treatment agent for high-strength nuts according to claim 1, characterized in that the surface decontaminating agent comprises: sodium dodecyl sulfate and sodium lauryl sulfate.

5. The surface treatment agent for high-strength nuts according to claim 4, wherein the mass ratio of sodium dodecyl sulfate to sodium lauryl sulfate is 1-2: 1-2.

6. The surface treatment agent for high-strength nuts according to claim 1, characterized in that the acid pickling passivation agent is composed of sodium chlorate and fluorozirconic acid in a mass ratio of 0.4-1: 5-10.

7. The preparation method of the surface treating agent for the high-strength nut as claimed in any one of claims 1 to 6, wherein the gamma-aminopropyltriethoxysilane, the deionized water and the aluminum tripolyphosphate are uniformly stirred to obtain a premix α, the surface detergent, the acid pickling passivator, the defoamer, the surfactant, the silica sol, the curing agent, the auxiliary agent and the organic solvent are uniformly stirred to obtain a premix β, and the premix α and the premix β are respectively packaged to obtain the surface treating agent for the high-strength nut.

8. The use method of the surface treatment agent for the high-strength nut, obtained in claim 7, is characterized in that the premix α and the premix β are uniformly mixed, stirred at 40-50 ℃ for 2-4h, and dip-coated on the high-strength nut for 20-40min, wherein the dip-coating temperature is 40-50 ℃, and cured at 120-130 ℃ for 4-6 min.

Technical Field

The invention relates to the technical field of nut surface treatment, in particular to a surface treating agent for a high-strength nut and preparation and use methods thereof.

Background

The metal is often oxidized, corroded and the like in different degrees in the processing, treatment and use processes, so that the service life of metal materials or metal equipment is shortened, and therefore, the metal surface needs to be treated, the oxidation resistance and corrosion resistance of the metal surface are improved, and the service life of the metal surface is prolonged.

In the production process of the bolt, the surface of the nut needs to be properly treated to enhance the performances of corrosion resistance, light resistance, ageing resistance and the like, and the conventional treatment methods comprise black phosphating and galvanizing methods, wherein the black phosphating can cause the surface of the nut to discolor, the application range of the nut is limited to a certain extent, the waste liquid after phosphating can pollute the environment, and the galvanizing can obtain a good treatment effect, but the process is complex and the cost is high.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a surface treating agent for a high-strength nut and a preparation method and a use method thereof.

A surface treating agent for a high-strength nut comprises the following raw materials in parts by weight: 2-5 parts of aluminum tripolyphosphate, 4-8 parts of organic silicon, 2-4 parts of a surface detergent, 6-12 parts of an acid pickling passivator, 0.2-1 part of a defoaming agent, 0.2-1 part of a surfactant, 0.2-0.6 part of a curing agent, 2-4 parts of an auxiliary agent, 20-30 parts of an organic solvent and 5-15 parts of deionized water.

Preferably, the organosilicon is gamma-aminopropyltriethoxysilane and/or silica sol.

Preferably, the silicone comprises: gamma-aminopropyltriethoxysilane and silica sol, wherein the mass ratio of the gamma-aminopropyltriethoxysilane to the silica sol is 2-6: 1-2.

Preferably, the surface detergent comprises: sodium dodecyl sulfate and sodium lauryl sulfate.

Preferably, the mass ratio of the sodium dodecyl sulfate to the sodium lauryl sulfate is 1-2: 1-2.

Preferably, the acid-washing passivating agent is prepared from sodium chlorate and fluorozirconic acid in a mass ratio of 0.4-1: 5-10.

The preparation method of the surface treating agent for the high-strength nut comprises the steps of uniformly stirring gamma-aminopropyltriethoxysilane, deionized water and aluminum tripolyphosphate to obtain a premix α, uniformly stirring a surface detergent, an acid pickling passivator, a defoaming agent, a surfactant, silica sol, a curing agent, an auxiliary agent and an organic solvent to obtain a premix β, and respectively packaging the premix α and the premix β to obtain the surface treating agent for the high-strength nut.

The application method of the obtained surface treating agent for the high-strength nut comprises the steps of uniformly mixing the premix α and the premix β, stirring for 2-4h at 40-50 ℃, dip-coating the high-strength nut for 20-40min, wherein the dip-coating temperature is 40-50 ℃, and curing for 4-6min at 120-130 ℃.

The technical effects of the invention are as follows:

(1) the invention has good stability and convenient use, can remove impurities on the surface of the high-strength nut, is environment-friendly, safe and effective in surface treatment of the nut, can form a bright surface on the surface of the nut, has extremely high adhesive strength after phosphorization and curing film formation, is simpler in dip-coating process compared with galvanizing treatment, and can effectively reduce the production cost;

(2) the surface treating agent is matched with sodium dodecyl sulfate and sodium lauryl sulfate, so that the decontamination effect on the high-strength nut is excellent, the phosphating temperature is 40-50 ℃, a compact phosphating layer is formed on the surface of the high-strength nut, and the surface treating agent has good synergistic effect by matching with the action of sodium chlorate, so that the phosphating process is rapidly finished, and then gamma-aminopropyltriethoxysilane and silica sol are cured for 4-6min at the temperature of 120-130 ℃, so that the bonding force between a phosphating film and a formed silane film is good in the high-strength nut after surface treatment;

(3) the surface treating agent obtained by the invention can not cause the surface of the nut to discolor, the process is simple, the adhesive force Baige test reaches level 1, the comprehensive impact resistance reaches 50cm/kg, the bending resistance is less than 1mm, and the salt spray resistance test is more than or equal to 500 h.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.