阅读说明：本技术 余热发黑剂、制备方法及使用方法 (Residual heat blackening agent, preparation method and use method ) 是由 桂成方 桂林 刘春花 于 2019-10-30 设计创作，主要内容包括：本发明提供一种余热发黑剂,其特征在于以重量百分比计,由以下成分制成：聚碳酸酯树脂13.3-16.8％,乙烯基树脂8.6-10.3％,炭黑6.6-9.1％,烷基酚甲醛树脂聚氧乙烯醚2.2-3.2％,聚丙烯酸钠1.8-2.8％,十二烷基硫酸钠0.8-1.2％,余量为水。该余热发黑剂能在钢铁及不锈钢表面进行微粗化处理,经微粗化的表面可明显提高金属表面的真实表面积,进而提高钢铁及不锈钢表面对防蚀层、隔震降噪材料的粘附性能。(The invention provides a waste heat blackening agent which is characterized by comprising the following components in percentage by weight: 13.3 to 16.8 percent of polycarbonate resin, 8.6 to 10.3 percent of vinyl resin, 6.6 to 9.1 percent of carbon black, 2.2 to 3.2 percent of alkylphenol formaldehyde resin polyoxyethylene ether, 1.8 to 2.8 percent of sodium polyacrylate, 0.8 to 1.2 percent of sodium dodecyl sulfate and the balance of water. The waste heat blackening agent can be used for carrying out micro-roughening treatment on the surfaces of steel and stainless steel, the micro-roughened surface can obviously improve the real surface area of the metal surface, and further the adhesion performance of the steel and stainless steel surface to an anti-corrosion layer and a shock insulation and noise reduction material is improved.)

1. The waste heat blackening agent is characterized by being prepared from the following components in percentage by weight:

2. the residual heat blackening agent according to claim 1, characterized in that the polycarbonate resin is an aqueous polycarbonate resin, and the number average molecular weight is 40000-50000.

3. The residual heat blackening agent according to claim 1, wherein said vinyl resin is 901 vinyl resin from Torricella Willd anticorrosive materials.

4. The residual heat blackening agent of claim 1, wherein the alkylphenol-formaldehyde resin polyoxyethylene ether is Nongru No. 700.

5. The method for preparing the residual heat blackening agent according to claim 1, characterized by comprising the steps of: weighing the components, blending, stirring and dissolving uniformly.

6. The use method of the residual heat blackening agent according to claim 1, characterized by comprising the steps of:

preparing a working solution: when in use, the blackening agent stock solution is diluted by adding tap water, and the water dilution ratio is 1: 9-15, stirring uniformly before diluting, and stirring uniformly after diluting and putting into production;

blackening process: the tempering waste heat of the workpiece is utilized or heated to more than 200 ℃, the temperature is kept for more than 30 minutes, the workpiece is immersed in the blackening working solution after being taken out of the furnace, the workpiece after being blackened is directly dried without being washed, the drying temperature is 100-150 ℃, the oil is applied after being dried or is applied after being naturally dried, and the workpiece is packaged after being cooled to the room temperature.

Technical Field

The invention relates to a blackening agent, in particular to a residual heat blackening agent and a preparation method thereof.

Background

In order to prevent the corrosion and the rust of steel parts and increase the beautiful appearance of the surfaces of the parts, the traditional method always uses a low-temperature alkaline black boiling process, and the process has the defects of complex operation, high labor intensity, high production cost, serious environmental pollution and the like although the process is widely applied for years. The residual heat blackening agent is characterized in that the surface of metal is cleaned at the moment when the blackening agent is contacted with the metal, and simultaneously, tempering residual heat existing on a workpiece is utilized to enable an organic compound film-forming material in the blackening agent to react and deposit on the surface of the metal to form a layer of protective film containing a coloring matter polymer material, so that an effective anti-corrosion and anti-rust effect is achieved through the adhesion and sealing effect of the organic matter coating film. The waste heat blackening agent can utilize the tempering waste heat of the workpiece to blacken various metal workpieces, such as: the advantages of the process effectively overcome three problems of high energy consumption, low efficiency and environmental pollution of the traditional blackening (bluing) process, and can save energy, reduce consumption and increase the benefit of enterprises. Is very popular with factories, especially large and medium-sized enterprises.

Chinese patent CN201810121194.9 provides a low-temperature waste heat blackening agent for steel surfaces and a preparation and application method thereof, wherein the low-temperature waste heat blackening agent for steel surfaces is prepared by mixing and stirring the following components in percentage by mass: 25-60 parts of film-forming resin, 2-10 parts of water-based pigment, water-based antirust agent, wetting dispersant, water-based defoaming agent, 1-5 parts of water-based preservative and the balance of water. The preparation method comprises the following steps: adding the required water, film-forming resin and wetting dispersant into a stirring kettle, and uniformly dispersing the resin into the water at a stirring speed of 30-100 revolutions per minute; adding the water-based pigment and the water-based antirust agent into the mixture obtained in the first step while stirring, and uniformly dispersing the mixture into water at the stirring speed of 30-100 revolutions per minute; and (5) adding a defoaming agent into the mixture obtained in the step two, uniformly dispersing the mixture into water at a stirring speed of 20-50 revolutions per minute, standing, packaging and sealing. The blackening agent has the advantages of water-based environmental protection, water saving, electricity saving, no discharge in the production and use processes, belongs to a clean production technology, and has simple process, low energy consumption and low cost. However, the blackening film is easy to generate bubbles after being used, and the adhesion is poor.

Chinese patent CN201510590467.0 provides an organic-inorganic residual heat blackening agent, which is prepared by mixing and stirring the following components in parts by weight: 6-23 parts of inorganic film forming agent, 1-3 parts of complexing agent, 3-6 parts of film forming auxiliary agent, 30-60 parts of water-based resin, 3-10 parts of water-based color paste and 5-55 parts of water. The invention also discloses a preparation method of the organic-inorganic waste heat blackening agent. The blackening agent can form a compact double-layer blackening film on the surface of a workpiece, and the double-layer blackening film has high corrosion resistance, so that the corrosion resistance of the workpiece is greatly improved; in addition, the inorganic components and the organic components used in the blackening agent do not pollute the environment; the preparation method of the blackening agent has the advantages of simple process, low energy consumption and low cost. The neutral salt spray test time of the patent after use is only 48 hours, which is far lower than 168 hours required by some customers.

Disclosure of Invention

In order to overcome the defects in the prior art, one of the objectives of the present invention is to provide a waste heat blackening agent, which can be used for micro-roughening the surfaces of steel and stainless steel, wherein the micro-roughened surface can significantly increase the real surface area of the metal surface, thereby improving the adhesion of the steel and stainless steel surfaces to an anti-corrosion layer and a vibration-isolating and noise-reducing material.

The second purpose of the invention is to provide a preparation method of the residual heat blackening agent.

The invention also aims to provide a using method of the residual heat blackening agent.

The waste heat blackening agent is prepared from the following components in percentage by weight:

wherein the polycarbonate resin is water-based polycarbonate resin, the number average molecular weight is 40000-50000, and the brand is preferably as follows: wacky, specification: the molecular weight is 45000.

The vinyl resin is also called vinyl ester resin, preferably 901 vinyl resin of Tokuwa West anticorrosive materials Co.

The alkylphenol formaldehyde resin polyoxyethylene ether is Nongru No. 700.

The principle is as follows: the polycarbonate resin is a main film forming resin, the vinyl resin can fill gaps to assist in film forming and enhance corrosion resistance, the carbon black provides black color for a blackening film, the alkylphenol formaldehyde resin polyoxyethylene ether improves wettability of the resin and a base material, the sodium polyacrylate is a film forming cross-linking agent, and the sodium dodecyl sulfate is a thickening agent and a brightening agent.

The preparation method of the waste heat blackening agent comprises the following steps:

weighing the components, blending, stirring and dissolving uniformly.

The use method of the waste heat blackening agent comprises the following steps:

preparing a working solution: when in use, the blackening agent stock solution is diluted by adding tap water, and the water dilution ratio is generally 1: 9-15 (namely adding 9-15 times of water), uniformly stirring before diluting, uniformly stirring after diluting, and putting into production, wherein the dilution principle is as follows: the temperature is high and the concentration is low, and the temperature is low and the concentration is high; the large concentration of the workpiece is low, and the small concentration of the workpiece is high.

Blackening process: the tempering waste heat of the workpiece is utilized or heated to more than 200 ℃, the temperature is kept for more than 30 minutes (the workpiece is heated uniformly to ensure the binding force of the blackening film and the matrix), the workpiece is immediately immersed into the blackening working solution after being taken out of the furnace, the workpiece after blackening is directly dried without being washed, the drying temperature is 100-150 ℃, the oil is applied after drying (the oil can be applied after naturally drying), and the workpiece is packaged (can not be packaged) after being cooled to room temperature.

Maintenance of working fluid: (1) the blackening working solution is cooled during continuous production, and the temperature of the working solution is preferably kept between 30 and 60 percent; (2) the working solution is kept circulating for a long time without standing for a long time; (3) other substances such as acid and alkali and the like are not required to be mixed so as to avoid damaging the blackening working solution, and if the liquid is not poisoned, the liquid can be used for a long time; (4) depending on the production amount, the addition of the stock solution or the addition of water was carefully performed to maintain an appropriate concentration.

The waste heat blackening agent has the beneficial effects that: the neutral salt spray test is more than 16 h; the adhesive force is 0 grade; the film layer is continuous, uniform and smooth, and has no bad flaws such as bubbles.

Detailed Description

The present invention is further illustrated by the following examples, which are not intended to be limiting.

Table 1 shows the formulations of examples 1 to 5 and comparative examples 1 to 2 in wt%.