阅读说明：本技术 一种易清洗丙烯酸面漆在冷藏集装箱中的应用 (Application of easy-to-clean acrylic finish paint in refrigeration container ) 是由 王位 杨蕾芳 王正纯 顾凤胜 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种易清洗丙烯酸面漆在冷藏集装箱中的应用,所述易清洗丙烯酸面漆由40～60份聚氨酯改性丙烯酸乳液、0.1～1份硅烷偶联剂、0.1～1份气相二氧化硅、0.1～2份润湿剂、0.2～3份消泡剂、0.1～1防霉剂等原料通过混合、搅拌等步骤制得,制备工艺简单。本发明提供的易清洗丙烯酸面漆,采用水性聚氨酯改性丙烯酸乳液改进现有技术中常使用的丙烯酸树脂,克服了丙烯酸树脂本身存在的冷脆热黏特性,同时还提高了面漆的耐沾污性能；同时,制得的面漆与常见的封闭底漆和中涂漆配合即可起到好的作用效果,涂膜厚度薄,涂层体系耐酸、耐碱、耐盐雾、耐玷污,色泽好、色差低等,在保证易清洗特性的基础上,也满足其他相关使用性能指标,具有良好的应用前景。(The invention discloses an application of an easy-to-clean acrylic finish paint in a refrigerated container, wherein the easy-to-clean acrylic finish paint is prepared from 40-60 parts of polyurethane modified acrylic emulsion, 0.1-1 part of silane coupling agent, 0.1-1 part of fumed silica, 0.1-2 parts of wetting agent, 0.2-3 parts of defoaming agent, 0.1-1 part of mildew preventive and the like through steps of mixing, stirring and the like, and the preparation process is simple. According to the easy-to-clean acrylic finish paint provided by the invention, the acrylic resin commonly used in the prior art is improved by adopting the waterborne polyurethane modified acrylic emulsion, so that the cold, brittle and hot adhesion characteristics of the acrylic resin are overcome, and the stain resistance of the finish paint is improved; meanwhile, the prepared finish paint can play a good role in matching with common seal primer and middle paint, has the advantages of thin film thickness, acid resistance, alkali resistance, salt mist resistance, pollution resistance, good color and luster, low color difference and the like, meets other related service performance indexes on the basis of ensuring the characteristic of easy cleaning, and has good application prospect.)

1. The application of the easy-to-clean acrylic finish paint in the refrigerated container is characterized in that the easy-to-clean acrylic finish paint is prepared from the following raw materials in parts by weight:

2. the use of the easy-to-clean acrylic finish paint in a refrigerated container as claimed in claim 1, wherein the easy-to-clean acrylic finish paint is prepared from the following raw materials in parts by weight:

3. the use of an easy-clean acrylic topcoat in a refrigerated container as recited in claim 1, wherein the preparation of the easy-clean acrylic topcoat comprises the steps of:

(1) adding deionized water into a container, respectively adding DMEA, fumed silica, a dispersing agent, a wetting agent, a defoaming agent and a mildew preventive according to a proportion under the stirring condition, and continuously stirring for 5min at the rotating speed of 500-800 r/min to obtain a mixture 1;

(2) adding the filler and the titanium dioxide into the mixture 1 under the stirring condition, stirring for 15min at the rotating speed of 500-800 r/min, and then grinding until the fineness is not more than 40 mu m to obtain a mixture 2;

(3) under the stirring condition, adding the polyurethane modified acrylic emulsion, the base material wetting agent, the defoaming agent, the silane coupling agent, the alcohol ester-12, the DPNB and the iron oxide yellow paste into the mixture 2, and stirring for 15min to obtain a mixture 3;

(4) and adding a polyurethane thickener into the mixture 3, and adjusting the viscosity and solid parts of the system to obtain the acrylic finish paint easy to clean.

4. Use of an easy-clean acrylic topcoat in a refrigerated container as claimed in claim 1 wherein the fumed silica is R974.

5. The use of an easily cleanable acrylic finish in a refrigerated container as claimed in claim 3 wherein said iron white is Tetrachuan python 996.

6. According to any one of claims 1 to 5The application of the easy-to-clean acrylic finish paint in the refrigerated container is characterized in that the polyurethane modified acrylic emulsion is a Tantamiwawa emulsion4219。

7. The use of an easy-clean acrylic topcoat in a refrigerated container as claimed in any one of claims 1 to 6, wherein the use comprises the steps of:

s1, polishing and cleaning the refrigerated container to be processed;

s2, coating a seal primer;

s3, painting in painting;

s4, coating acrylic acid finish paint which is easy to clean;

and S5, after finishing coating, standing for more than 7 days to finish spraying.

8. The use of an easy-clean acrylic topcoat in a refrigerated container as recited in claim 1, wherein the spray interval of the sealer, midcoat and easy-clean acrylic topcoat is not less than 1 hour.

9. The use of an easy-to-clean acrylic topcoat in a refrigerated container as claimed in any one of claims 1 to 8, wherein the primer coating thickness is 30 to 40 μm, the intercoat coating thickness is 40 to 50 μm, and the easy-to-clean acrylic topcoat coating thickness is 50 to 60 μm.

Technical Field

The invention relates to the technical field of water-based coatings, in particular to application of an easily-cleaned acrylic finish in a refrigerated container.

Background

A container (container) is a kind of grouping tool which can be loaded with packaged or unpackaged goods for transportation and is convenient for loading, unloading and carrying by mechanical equipment. Containers are now playing an increasingly important role in global trade and modern logistics, being able to be transported by either sea or land. Container transportation, which typically exposes the container to the elements, is subject to harsh climatic conditions, such as high temperature, high humidity, wind and sun. Therefore, the paint for the container has higher performance requirements than the paint for the ship body and the common structural steel, and the aging of the paint film required by the box body can be 3-5 years.

The refrigerated container (Reefer container) is a special container which has good heat insulation and can maintain a certain low temperature requirement and is suitable for the transportation and storage of various perishable foods. Compared with the use of a common container, when the refrigerated container is transported, the common paint coating can not effectively prevent heat from entering the refrigerated container, so that the refrigerating effect of the container is reduced, and the refrigerated objects are affected.

In the prior art, the coating film of the refrigerated container is concerned about performances such as corrosion prevention and refrigeration (see patent documents CN111748259A and CN 111548703A), and whether the outer surface of the refrigerated container is easy to clean is not concerned much. In fact, whether the refrigerated container is stored in a storage yard or transported, the refrigerated container can be subjected to wind and rain, the outer surface of the refrigerated container is extremely easy to become dirty, secondary sales of the refrigerated container is influenced, and the appearance is also influenced. At present, many researches have been made on a coating film using an acrylic emulsion as a main film forming material in a refrigerated container, but the coating film has obvious defects: such as easy cold, crisp and hot sticking, and easy pollution by rain water and pollutants in the air to form rain marks which affect the appearance, and cause more complaints of customers. In addition, the topcoats currently available in the specialty box are based on solvent-based acrylic topcoats, which suffer from high VOC levels (typically greater than 500 g/L). Therefore, the development of a refrigerated container finish with low VOC content and easy cleaning is needed in the market.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the application of the easy-to-clean acrylic finish paint in the refrigerated container, and the prepared acrylic finish paint is water-based paint and has low VOC content by reasonably selecting the raw material components and the content of each substance; meanwhile, the refrigerated container using the acrylic finish paint is easy to clean.

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

the application of the easy-to-clean acrylic finish paint in the refrigeration container comprises the following raw materials in parts by weight:

as a further preferable technical scheme of the invention, the easy-to-clean acrylic finish paint is prepared from the following raw materials in parts by weight:

preferably, the preparation of the easy-cleaning acrylic finish paint comprises the following steps:

(1) adding deionized water into a container, respectively adding DMEA, fumed silica, a dispersing agent, a wetting agent, a defoaming agent and a mildew preventive according to a proportion under the stirring condition, and continuously stirring for 5min at the rotating speed of 500-800 r/min to obtain a mixture 1;

(2) adding the filler and the titanium dioxide into the mixture 1 under the stirring condition, stirring for 15min at the rotating speed of 500-800 r/min, and then grinding until the fineness is not more than 40 mu m to obtain a mixture 2;

(3) under the stirring condition, adding the polyurethane modified acrylic emulsion, the base material wetting agent, the defoaming agent, the silane coupling agent, the alcohol ester-12, the DPNB and the iron oxide yellow paste into the mixture 2, and stirring for 15min to obtain a mixture 3;

(4) and adding a polyurethane thickener into the mixture 3, and adjusting the viscosity and solid parts of the system to obtain the acrylic finish paint easy to clean.

In a preferred embodiment of the invention, the fumed silica is R974.

In a preferred embodiment of the invention said iron white powder is python 996 from Sichuan.

In a preferred embodiment of the present invention, the urethane-modified acrylic emulsion is Nitidowana Lacper

In a preferred embodiment of the invention, the application comprises the following steps:

s1, polishing and cleaning the refrigerated container to be processed;

s2, coating a seal primer;

s3, painting in painting;

s4, coating acrylic acid finish paint which is easy to clean;

and S5, after finishing coating, standing for more than 7 days to finish spraying.

In a further preferred embodiment of the invention, the spray intervals of the sealer, midcoat and easy-clean acrylic topcoat are not less than 1 hour.

Preferably, the thicknesses of the seal coat, the middle coat and the easy-cleaning acrylic finish paint in the invention meet the relevant regulations, and the specific thicknesses can be determined by actual requirements.

In a further preferred embodiment of the invention, the coating thickness of the primer is 30-40 μm, the coating thickness of the intermediate coating is 40-50 μm, and the coating thickness of the easy-cleaning acrylic finish is 50-60 μm.

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

(1) aiming at the characteristic that the refrigerated container is easy to dirty after being exposed for a long time, the invention provides the acrylic finish paint which is suitable for the refrigerated container and easy to clean for the first time based on the actual requirement of easy cleaning; the finish paint is water-based paint, and has low VOC content and good color.

(2) The easy-to-clean acrylic finish provided by the invention adopts the waterborne polyurethane modified acrylic emulsion to improve the acrylic resin commonly used in the prior art, overcomes the cold, brittle and hot adhesion characteristics of the acrylic resin, and simultaneously improves the stain resistance of the finish.

(3) The easy-to-clean acrylic finish paint provided by the invention is simple in components, wide in source of used raw materials and easy to obtain, and has the advantages of good luster, short drying time, good appearance, small color difference and good scratch resistance through reasonable collocation of components and scientific control of the using amount, and meets the actual using requirements. The silane coupling agent is used in a small amount, so that the easy-to-clean performance of the coating is improved, pollutants are not easy to adhere, and the cleanliness of the refrigerated container is kept by multidimensional operation.

(4) The easy-to-clean acrylic finish paint provided by the invention can play a good role and effect by being matched with common seal primer and middle paint, has the advantages of simple application method, thin coating thickness, acid resistance, alkali resistance, salt mist resistance, pollution resistance, good color, low color difference and the like, meets other related service performance indexes on the basis of ensuring the easy-to-clean characteristic, and has good application prospect.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly illustrated, the present invention will be further explained in detail with reference to the following examples.

It should be noted that the raw materials used in the present invention are purchased from the outside unless otherwise specified. Wherein the fumed silica is R974 of EVONIK, the titanium dioxide is 996 of Szechwan python, the filler is purchased from Jiangxi Guanghua chemical industry Limited liability company, the polyurethane modified acrylic emulsion is purchased from Wanhua chemical, the DPNB is purchased from Dow chemical, the alcohol ester-12 is purchased from Wanhua Tong City break Tai chemical industry Limited company, and the polyurethane thickener is purchased from Wanhua Tong City breakChemically, the polyurethane modified acrylic emulsion is a Tantaowawa Lacper

Example 1

An acrylic finish easy to clean is prepared from the following raw materials:

in this embodiment, the preparation method of the easy-to-clean acrylic finish paint is as follows:

(1) adding deionized water into a container, respectively adding DMEA, fumed silica, a dispersing agent, a wetting agent, a defoaming agent (0.2g, wherein the content of the organic silicon defoaming agent is 0.1g) and a mildew preventive in proportion under the stirring condition, and continuously stirring for 5min at the rotation speed of 550r/min to obtain a mixture 1;

(2) adding the filler and the titanium dioxide into the mixture 1 under the stirring condition, stirring for 15min at the rotating speed of 600r/min, and then grinding until the fineness is not more than 40 mu m to obtain a mixture 2;

(3) under the stirring condition, adding the polyurethane modified acrylic emulsion, the base material wetting agent, 0.1g of defoaming agent, the silane coupling agent, the alcohol ester-12, the DPNB and the iron yellow paste into the mixture 2, and stirring for 15min to obtain a mixture 3;

(4) and adding a polyurethane thickener into the mixture 3, and adjusting the viscosity and solid parts of the system to obtain the acrylic finish paint easy to clean.

In the embodiment, the easy-to-clean acrylic finish paint prepared by the method is used for a film coating of a refrigerated container, and comprises the following steps:

s1, polishing and cleaning the refrigerated container to be processed;

s2, coating sealing primer with the thickness of 30 mu m;

s3, after 1.5h, painting the intermediate coat with the thickness of 40 μm;

s4, after 1.5h, coating acrylic finish paint which is easy to clean and has the thickness of 50 mu m;

and S5, after finishing coating, standing for more than 7 days to finish spraying.

Examples 2 to 4

In examples 2 to 4, the easy-to-clean acrylic finish is prepared from the following raw materials:

TABLE 1 preparation of raw materials (unit: g) of examples 2 to 4

Raw materials	Example 2	Example 3	Example 4
				Deionized water	3	4	5
DMEA	0.2	0.2	0.3
				Fumed silica	0.6	0.7	0.8
Dispersing agent	1.3	1.5	1.6
				Wetting agent	0.4	0.6	0.8
Defoaming agent	0.5	0.7	0.9
				Mildew preventive	0.3	0.4	0.5
Filler material	4	5	6
				Iron white powder	16	17	18
Polyurethane modified acrylic emulsion	45	50	55
				Substrate wetting agent	0.2	0.3	0.4
Silane coupling agent	0.2	0.3	0.4
				Alcohol ester-12	1.8	2	2.4
DPNB	1.4	1.6	1.8
				Iron oxide yellow color paste	0.2	0.3	0.4
Polyurethane thickener	0.2	0.3	0.3

The preparation methods of the easy-to-clean acrylic acid finish paints in the embodiments 2 to 4 are the same except for different use amounts.

Particularly, the amount of the defoaming agent in the step (1) in examples 2 to 4 is 0.2g, 0.4g and 0.6g, wherein the amount of the silicone defoaming agent is 0.1g, and the other preparation steps are the same.

In examples 2-4, the treatment steps of applying the prepared easy-to-clean acrylic finish paint to a film of a refrigerated container are the same as in example 1.

Comparative example 1

In comparative example 1, the urethane-modified acrylic emulsion was replaced with an acrylic emulsion, and the remaining raw materials, the preparation method and the application steps were the same as in example 2.

Comparative example 2

In comparative example 2, no silane coupling agent was used, and the remaining raw materials, the production method and the application steps were the same as in example 2.

The easy-to-clean acrylic finishes prepared in examples 2 and 3 and comparative examples 1 and 3 were subjected to performance tests, and the results are shown in table 2.

The plate manufacturing method comprises the following steps: according to the regulation of GB/T1727, a test plate is polished by sand paper (600 meshes), and is coated after cleaning treatment, and the dry film thickness of a paint film is (50-60) mu m. And (3) placing the coated test plate after the acrylic finish paint is sprayed for 20 min, drying the coated test plate for 40min at the temperature of 70 +/-2 ℃, taking out the coated test plate, and testing the coating performance after the coated test plate is placed for 7 d.

TABLE 2 product test results for topcoats in examples and comparative examples

As can be seen from Table 2, the performance of the topcoats prepared in examples 2 and 3 are superior in all respects to those of comparative examples 1 and 2.

Next, the performance test was performed on the refrigerated container coating systems (coating implementation method the same as that in the examples) sprayed with the easy-to-clean acrylic topcoats prepared in examples 2 and 3 and comparative examples 1 and 3, and the results are shown in table 3.

TABLE 3 coating System test results

As can be seen from Table 3, the performance of the coating system containing the top coats obtained in the examples is superior to that of the coating systems containing the top coats obtained in comparative examples 1 and 2, and the coating system containing the top coat obtained in comparative example 1 is poor in heat resistance and humidity resistance; particularly, the test result shows that the stain resistance grade of the finish paint prepared by the method is 0 grade, no pollution is caused, no perceptible color difference is caused, and the stain resistance is strong; the finish paint in comparative example 1 had a stain resistance rating of 3, a moderate degree of staining and a very significant color difference, and the finish paint in comparative example 2 had a stain resistance rating of 2, a slight degree of staining and a relatively significant color difference. Meanwhile, in practical application tests, after the refrigerated container sprayed with the coating system is placed for several months, the surface pollutants are obviously less, and the refrigerated container can be bright as new through simple treatment.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.