KR100262386B1 - Thermosetting anti-corrosion paint recycled waste paint - Google Patents

Abstract

PURPOSE: A thermosetting anti-corrosive paint obtained from recycling of waste paint is provided to use for preventing generation of rust in the lower part of automobile, container, an iron plate, machine parts, have good thermosetting, water resistance, chemical resistance, impact resistance properties and the like, cause no atmosphere pollution, and prevent or reduce environmental pollution and the squandering of resource. CONSTITUTION: The thermosetting anti-corrosive paint comprises polyvinylchloride resin, plasticizer, filler, stabilizing agent, polyamide resin and other additives, and waste paint. The components are added to dryness unit. Then water and solvent of at least 95% is removed from the mixture by radiating electromagnetic wave of 915-2450MHz for 10-30min. After removing vapor phase, plasticizer of 10-30% by weight is added and sprayed to form liquid resin(BHO-500) having 25,000-30,000cps. The weight ratio of polyvinylchloride resin and BHO-500 should be 1:0.4-2.5, and total amount of polyvinylchloride resin and BHO-500 is in the range of 18-45% by weight based on the composition. Alternatively, the paint can comprise grinded powder(BHO-300) in place of the liquid resin.

Description

Thermosetting Antirust Paint Recycling Waste Paint

The present invention relates to an anticorrosive paint that recycles waste paint having excellent thermosetting, water resistance, chemical resistance, impact resistance, and shear adhesion strength. More specifically, a plasticizer is added to a paste resin according to the degree of curing and contamination of the waste paint. Dispersed into resins or finely divided powders with a viscosity of 30,000 cps or more, and then recycled as a substitute for polyvinyl chloride resins and / or fillers in rust-preventive paints to prevent environmental pollution and waste of resources, while reducing costs The present invention relates to a thermosetting rust preventive paint in which waste paint can be recycled.

At present, global concern about water quality and air pollution is intensified, and as the regulations are tightened, interest in the environmental field is increasing, and related industries are also developing. Therefore, while recycling waste paints, efforts have been made to efficiently prevent environmental pollution and waste of resources, and to develop their uses. As part of this effort, Korean Patent Application Publication No. 98-2158 (published date: 98.3.30) and Korean Patent Application Publication No. 98-2123 (published date: 98.3.30) for the applicant, respectively, The present invention proposes a soundproof dustproof plate that recycles waste paint and a method and apparatus for recycling waste paint.

In line with such efforts, the present applicant has completed the present invention regarding the above-mentioned thermosetting rust preventive paint, and the present application is disclosed in Korean Patent Application Publication No. 98-2123 (98.3) by the present applicant. The invention relates to the method and apparatus for recycling waste paint.

Korean Patent Application Publication No. 98-2123 according to the present applicant is a liquid treatment process for processing the pre-treated waste paint in which the collected waste paint is allowed to stand in a collecting tank and subjected to phase separation through a reaction tank and a dispersion tank, a grinder, a cooling device, Disclosed are a recycling method and an apparatus for recycling waste paint each composed of a powdery processing step treated with a coarse mill and a fine mill.

Accordingly, the first object of the present invention is to prevent or reduce environmental pollution and waste of resources by industrially recycling the waste paint without simply incineration the waste paint to cause air pollution.

A second object of the present invention is to reduce the production cost of the rust preventive paint by recycling the waste paint treatment as a replacement for some of the components of the rust preventive paint.

According to one preferred aspect for achieving the first and second objects of the present invention, in the rust-preventive paint comprising a polyvinyl chloride resin, a plasticizer, a filler, a safety agent, a polyamide resin and an additive, 10 to 25 wt% polyvinyl chloride resin, 15 to 25 wt% plasticizer, 25 to 45 wt% filler, 2 to 8 wt% stabilizer, 2 to 8 wt% polyamide resin, 4 to 6 wt% additive, and waste paint 10 to 30% by weight of a plasticizer based on the weight of the paste resin obtained by removing the vapor phase with a deaerator by irradiating electromagnetic waves at 915 to 2450 MHz for 10 to 30 minutes in a drying apparatus. It is composed of 8 to 25% by weight of a liquid resin obtained by adding and dispersing (brand name 'BHO-500'), wherein the polyvinyl chloride resin: BHO-500 = 1: 0.4 to 2.5 by weight and the polyvinyl chloride resin and BHO- The total amount of 500 is 18 to 45 weight based on the total weight of the composition. A thermosetting rust preventive paint is provided which simultaneously meets two requirements in the range of amount%.

According to another preferred aspect for achieving the first and second objects of the present invention, in the rust-preventive paint comprising a polyvinyl chloride resin, a plasticizer, a filler, a stabilizer, a polyamide resin and an additive, 10 to 25 wt% polyvinyl chloride resin, 15 to 25 wt% plasticizer, 7 to 15 wt% filler, 2 to 8 wt% stabilizer, 2 to 8 wt% polyamide resin, 4 to 6 wt% additive, and waste paint Irradiated with electromagnetic waves of 915 to 2450 MHz in a drying apparatus for 10 to 90 minutes, and 18 to 35% by weight of a powder (trade name 'BHO-300') having a water content of 0.01% or less pulverized to 100 mesh or more. BHO-300 = 1: 0.2 to 5, and the thermosetting rust-preventive paint, characterized in that both the filler and the BHO-300 total content meets both requirements in the range of 25 to 45% by weight based on the total weight of the composition. Is provided.

According to another preferred aspect for achieving the first and second objects of the present invention described above, in the rust-resistant pate containing polyvinyl chloride resin, plasticizer, filler, stabilizer, polyamide resin and additives And a polyvinyl chloride resin: BHO-500 = 1: 0.4 to 2.5 by weight, and filler: BHO-300 = 1: 0.2 to 5 by weight.

The above-described Patent Application Publication No. 98-2123 by the present applicant, the drying apparatus for drying the waste paint phase separated in the water collecting tank by electromagnetic waves, primary and secondary reactors, primary and secondary reaction of the dried waste paint A waste paint liquid treatment step of treating in an apparatus composed of a tea dispersion tank; Each of the waste paint powder processing process includes a drying apparatus for drying the waste paint powder separated from the sump by an electromagnetic wave, and processing the dried waste paint powder in a device consisting of a primary crusher, a cooling device, a coarse pulverizer, and a fine pulverizer. Waste paint treatment methods and apparatus are disclosed.

The above application discloses a method for preparing primer paints, replacement resins, powdered waste paints, liquid paints for paints, and the like, by adding various additives to the paste-like resin passed through the first reactor in the secondary reactor. However, here it will be briefly described to the extent necessary to understand the present invention related to the present invention.

The present invention utilizes a liquid resin for painting and / or powdered waste paint, which are prepared by the liquid treatment process and the powdery process of Patent Application Publication No. 98-2123, respectively.

As described in detail in the above application, the above-described method for preparing a liquid resin for paint is performed by applying waste paint in a drying apparatus to irradiate electromagnetic waves of 915 to 2450 MHz for 10 to 30 minutes to remove more than 95% of water and solvents. After removing the vapor phase with a deaerator in the reaction tank, 10-30% by weight of the plasticizer was added to the paste resin through the reaction tank at room temperature under the weight of the paste resin, followed by sufficient reaction, and then dispersed in a dispersion tank. Resin (brand name 'BHO-500') is obtained.

In addition, the method for producing the powdery paint is a waste paint is irradiated with electromagnetic waves of 915-2450MHz for 10 to 90 minutes in a drying apparatus, then pulverized with a primary pulverizer and then cured in a cooling apparatus, then coarse crusher and fine pulverizer A powder (trade name 'BHO-300') having a water content of 0.01% or less finely pulverized to 100 mesh or more, preferably 180 mesh or more, is obtained.

The present invention applies the above-mentioned liquid resin for paints (BHO-500) and / or powdered waste paint (BHO-300) to antirust paint.

Antirust paints generally consist of polyvinyl chloride resins, plasticizers, fillers, stabilizers, polyamide resins and other additives.

The antirust paint recycled waste paint according to the present invention is 8 to 25% by weight of BHO-500 (preferably 10 to 20% by weight), 10 to 20% by weight polyvinyl chloride resin, 2 to 8% by weight stabilizer, Viscosity obtained by reacting 25 to 45% by weight of filler, 2 to 8% by weight of polyamide resin, 15 to 25% by weight of plasticizer and 4 to 6% by weight of additive for 1 to 2 hours at room temperature, and then dispersing it thoroughly in a dispersing tank. It is a liquid rust preventive paint of 25,000-30,000cps. Here, the total amount of polyvinyl chloride resin and BHO-500 is in the range of 18 to 45% by weight based on the weight of the composition and polyvinyl chloride resin: BHO-500 = 1: 0.4 to 2.5, which satisfies both requirements simultaneously. It is preferable to express the physical properties required for the composition of the present invention.

In addition, the anti-corrosive paint recycled waste paint according to the present invention is 18 to 35% by weight of BHO-300 (preferably 20 to 30% by weight), 10 to 20% by weight of polyvinyl chloride resin, and 2 to 8% by weight of stabilizer. %, 7 to 15% by weight of filler, 2 to 8% by weight of polyamide resin, 15 to 25% by weight of plasticizer and 4 to 6% by weight of additives are obtained by mixing and dispersing thoroughly. Wherein the total amount of filler and BHO-300 is in the range of 25 to 45% by weight based on the total weight of the composition and simultaneously satisfies the two requirements of the weight ratio of filler: BHO-300 = 1: 0.2 to 5 It is preferable in expressing the physical properties required by.

Preferred examples of the plasticizer used in the rust preventive paint recycled waste paint according to the present invention include, but are not limited to, dioctyl phthalate, diisononyl phthalate, dinormal octyl phthalate, dibutyl phthalate, dimethyl phthalate, and the like. . In addition, preferred examples of the fillers include calcium carbonate, mica, and the like, which are not limiting and optional. As the liquid rubber, styrene butadiene rubber is most preferred. On the other hand, polyamide resin can be preferably used as a tackifier. In addition, the stabilizer serves to stabilize the components, particularly the tackifier in the composition, and particularly preferred examples thereof include lauric acid and barium. On the other hand, the additive used in the present invention is for increasing the compatibility between the components of the composition, and particularly preferred examples include diethylene glycol dibenzoate.

The present invention relates to polychlorinated chlorinated paint constituents described above under the trade names 'BHO-500' and / or 'BHO-300' as defined above, which are prepared by the above-described Applicant Publication No. 98-2123. By using each of the plastic resin and filler as a partial replacement, it is possible to reduce pollution and resource waste caused by simple incineration of the waste paint, and to reduce the cost of the rust-preventive paint produced. On the other hand, the rust preventive paint according to the present invention may partially replace only polyvinyl chloride resin with BHO-500, may also partially replace only the filler with BHO-300, or may simultaneously partially replace both of the above. However, the entire replacement of polyvinyl chloride resin with BHO-500 is not preferable because it leads to a decrease in viscosity of the rust-preventive paint, deterioration of workability, and impact resistance and hardness reduction of the coating film. It is also undesirable to replace the entire surface with 300 because it causes a decrease in the viscosity of the rust preventive paint and degrades workability.

Anti-corrosive paint recycled waste paint according to the present invention can be suitably used for rust prevention to prevent outgoing of the lower body of the vehicle, container, steel plate base, mechanical parts and the like.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the following Examples are only intended to illustrate the present invention and should not be understood as limiting the present invention.

EXAMPLE

Example 1

As described above, the polyvinyl chloride resin was partially replaced with BHO-500 to prepare an antirust paint recycled waste paint according to the present invention. The brand name BK-04 was used as a stabilizer, and the brand name SS-800, a British ICI company, was used as an additive as a compatibilizer.

Example 2

As described above, a part of the filler was replaced with BHO-300 to prepare an rust preventive paint recycled waste paint according to the present invention.

Example 3

As described above, the polyvinyl chloride resin and the filler were partially replaced with BHO-500 and BHO-300, respectively, to prepare rust preventive paints recycled waste paint according to the present invention.

Example 4

As described above, the polyvinyl chloride resin and the filler were partially replaced with BHO-500 and BHO-300, respectively, to prepare rust preventive paints recycled waste paint according to the present invention.

Comparative Example 1

As described above, anti-rust paint was prepared by replacing the entire polyvinyl chloride resin with BHO-500.

Comparative Example 2

As described above, anti-rust paint was prepared by replacing the entire amount of the filler with BHO-300.

Each of the antirust paints prepared in Examples and Comparative Examples was subjected to the following performance evaluation test, and the results are shown in Table 1.

[Performance Evaluation Test]

[Visual inspection]

10 g of each sample was placed on a clean glass plate and lightly coated with a spatula or glass rod, and then homogeneity and presence of foreign matters were observed. The judgment was as follows.

○: No foreign matter and homogeneous ×: Rough surface and not homogeneous

[Solid content test]

The mass of the sample after drying 10g of each sample at 150 degreeC for 1 hour was measured, and the quantity of solid content in a sample was measured. The solid content of 95% or more was excellent in adhesiveness and workability, and the lower one was inferior in workability by the flow phenomenon. The judgment was as follows.

○: 95% or more ×: 95% or less

[Weight test]

Specific gravity was measured with specific gravity cups according to Clause 5 of KSM 2095. The lower the specific gravity of the rust preventive paint, the better the weight of the product. The break was as follows.

○: 1.45 or less ×: 1.45 or more

[Viscosity measurement test]

Viscosity was measured using a BH viscometer in accordance with clause 7 of KSM 2095. If the viscosity is less than 25,000 cps, the workability deteriorates due to the flow characteristics, while if the viscosity is more than 35,000 cps, the workability is inferior. The judgment was as follows.

○: 25,000 to 35,000 △: 35,000 or more ×: 25,000 or less

[Impact Resistance Test]

The sample was applied to a prescribed test specimen at room temperature (or -30 ° C) at 0.8 mm or less and left for about 3 hours, and then impacted by dropping a weight of 500 g at a height of 50 cm. Then, the state of the sample was observed. The judgment was as follows.

○: good ×: crack or peeling

[Alkali Resistance Test]

The sample was immersed in a 5% caustic soda solution for 24 hours, and the discoloration state of the sample was observed at room temperature. The judgment was as follows.

○: Good ×: discoloration or peeling

[Acid resistance test]

The sample was immersed in a 5% sulfuric acid solution at room temperature for 24 hours, and the discoloration state of the sample was observed at room temperature. The judgment was as follows.

○: Good ×: discoloration or peeling

[Heat resistance test]

The test piece to which the sample was apply | coated was put into the dryer of about 140 degreeC, and heated for 2 hours, and what was cooled was compared with the thing before heating. The judgment was as follows.

○: good ×: swelling or peeling

[Water Resistance Test]

The test piece coated with the sample was immersed in water for 240 hours, and then swelling, peeling, and softening of the coating film were observed. The judgment was as follows.

○: Good ×: swelling, peeling or discoloration

[Salt Resistance Test]

Salt water was sprayed on the test piece to which the sample was applied, and it was observed whether or not it was after 240 hours. The judgment was as follows.

○: Good ×: Rust generation

[Hardness Test]

The sample was applied to the specimen with a thickness of 0.8 mm or less, dried in a 180 ° C. dryer for 10 minutes, left at room temperature for 24 hours, and the hardness was measured three times or more with a Shore hardness tester. The judgment was as follows.

○: 70 h or more ×: 70 h or less

[Adhesive Strength Measurement]

The sample was applied to the thickness of the test piece between two test pieces about 25 mm apart and dried in a dryer. Thereafter, the tensile strength was measured at 50 mm / min on both sides to measure the maximum shear stress. The judgment was as follows.

○: 7 kg / cm 2 or more ×: 7 kg / cm 2 or less

As is clearly appreciated from Table 1 above, the present invention has abrasion resistance, chipping resistance and cold resistance by partially replacing polyvinyl chloride resin with BHO-500, and fluidity and hardness by partially replacing filler with BHO-300. It is possible to improve the workability by adjusting the weight of the film produced and the physical properties of the coating film are also satisfactory.

Claims (3)

In rust preventive paints comprising polyvinyl chloride resin, plasticizer, filler, safety agent, polyamide resin and additives, polyvinyl chloride resin 10-25% by weight, plasticizer 15-25% by weight, filler 25-45% by weight, stabilizer 2 to 8% by weight, 2 to 8% by weight of polyamide resin, 4 to 6% by weight of additive, and waste paint were irradiated with electromagnetic waves of 915 to 2450 MHz for 10 to 30 minutes in a drying apparatus to remove more than 95% of water and solvent. Next, a liquid resin (trade name 'BHO-500') having a viscosity of 25,000 to 30,000 cps obtained by adding and dispersing 10 to 30% by weight of a plasticizer based on the weight of paste resin obtained by removing the vapor phase with a deaerator. It is composed of weight percent, wherein the polyvinyl chloride resin: BHO-500 = 1: 0.4 to 2.5 by weight ratio and the total amount of polyvinyl chloride resin and BHO-500 is in the range of 18 to 45% by weight based on the total weight of the composition. Characterized by meeting both requirements simultaneously Thermosetting rust preventive paint with recycled waste paint. The method of claim 1, wherein the filler is included in the range of 7 to 15% by weight, and after the waste paint is irradiated with electromagnetic waves of 915 to 2450 MHz for 10 to 90 minutes in a drying apparatus, the water is pulverized to 100 mesh or more. A thermosetting rust preventive paint in which waste paint containing 18 to 35% by weight of powder having a content of 0.01% or less (brand name 'BHO-300') is also recycled. In rust-preventive paints containing polyvinyl chloride resin, plasticizer, filler, stabilizer, polyamide resin and additives, polyvinyl chloride resin 10-25% by weight, plasticizer 15-25% by weight, filler 7-15% by weight, stabilizer 2 -8% by weight, polyamide resin 2-8% by weight, additives 4-6% by weight, and moisture content pulverized to 100 mesh or more after irradiation of 915-2450 MHz electromagnetic wave for 10 to 90 minutes in an amount of 0.01% or less Powder (brand name 'BHO-300') is composed of 18 to 35% by weight, wherein the filler: BHO-300 = 1: 0.2 to 5 weight ratio and the total amount of filler and BHO-300 25 to 45 based on the total weight of the composition A thermoset rust preventive paint with recycled waste paint characterized by simultaneously meeting two requirements in the range of% by weight.