阅读说明：本技术 一种耐高低温水性可剥离防护涂料及其制备方法 (High-low temperature resistant water-based strippable protective coating and preparation method thereof ) 是由 丁嘉欣 黄鑫 张刚 阳区 李著初 袁欢欢 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种耐高低温水性可剥离防护涂料,其组分按重量份计包括水性阴离子脂肪族聚醚聚氨酯分散体60～85份、丙烯酸乳液3～10份、防粘增滑剂1～6份、消泡剂0.1～0.8份、流平剂0.1～0.5份、增稠剂0.2～1份、成膜助剂1～10份,制备的耐高低温水性可剥离防护涂料为热塑性单组分常温固化成膜涂料,不仅可涂装在各种金属板上而且可涂装在环氧类涂层、聚氨酯涂层、丙烯酸等有机涂层上,可剥离防护涂层既能在60℃条件下具有长期完整可剥离性,又能在-20℃条件下漆膜柔韧性良好不发脆,具备长期完整可剥离性,且耐水性能、耐候性能好。(The invention discloses a high and low temperature resistant water-based strippable protective coating which comprises, by weight, 60-85 parts of a water-based anionic aliphatic polyether polyurethane dispersoid, 3-10 parts of acrylic emulsion, 1-6 parts of an anti-sticking slipping agent, 0.1-0.8 part of a defoaming agent, 0.1-0.5 part of a leveling agent, 0.2-1 part of a thickening agent and 1-10 parts of a film forming aid, wherein the prepared high and low temperature resistant water-based strippable protective coating is a thermoplastic single-component normal-temperature cured film forming coating, can be coated on various metal plates, epoxy coatings, polyurethane coatings, acrylic acid and other organic coatings, and can have long-term complete strippability at the temperature of 60 ℃, and a paint film with good flexibility and no brittleness at the temperature of-20 ℃, and has long-term complete strippability, water resistance and good weather resistance.)

1. A high and low temperature resistant water-based strippable protective coating: the paint is characterized by comprising the following components in parts by weight:

wherein, the anionic aliphatic polyether polyurethane dispersoid is specially named Tesmann E251 resin.

2. The high and low temperature resistant water-based peelable protective coating according to claim 1, wherein the acrylic emulsion has a glass transition temperature Tg of 60 ℃ or higher.

3. The high and low temperature resistant water-based peelable protective coating according to claim 1, wherein the anti-sticking slip agent is one or more of organic ester type, water-based silicone oil type and water-based silicone fluorine modified type.

4. The high and low temperature resistant aqueous peelable protective coating composition according to claim 1, wherein the defoamer is a polyether siloxane copolymer.

5. The high and low temperature resistant aqueous peelable protective coating composition according to claim 1, wherein the leveling agent is a polyether siloxane copolymer.

6. The high and low temperature resistant aqueous peelable protective coating according to claim 1, wherein the thickener is one or more of a polyether polyurethane associative type or a cellulose type thickener.

7. The high and low temperature resistant aqueous peelable protective coating according to claim 1, wherein the film forming aid is an alcohol ether film forming aid.

8. The high and low temperature resistant water-based peelable protective coating according to claim 1, wherein the film forming agent is one of dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, and tripropylene glycol n-butyl ether.

9. The high and low temperature resistant water-based peelable protective coating according to any one of claims 1-8, further characterized by being prepared by:

firstly adding an anionic aliphatic polyether polyurethane dispersoid, sequentially adding an acrylic emulsion, an anti-sticking slipping agent, a defoaming agent, a leveling agent, a thickening agent and a film-forming aid under a stirring state, controlling the stirring speed at 1000 ion/min, wherein the feeding time of each raw material is 3-5 min, stirring for 8-15 min after adding, then adding the next raw material, stirring for 20-30 min at the speed of 1000 ion/min after adding all the raw materials, filtering and subpackaging.

Technical Field

The invention relates to the technical field of coatings, in particular to a high-low temperature resistant water-based strippable protective coating.

Technical Field

The strippable paint is a functional special paint for temporary protection of the surface of a substrate. During the construction process of relevant parts of a large ship, the construction period is long, the relevant parts are difficult to be polluted by dust, rainwater, oil stains, welding slag, scrap iron and the like, the subsequent maintenance cost is increased, and manpower, material resources and financial resources are wasted. The traditional solution is to wrap canvas or aluminum foil paper on the surface of the protected object, but the temporary protection effect is not ideal, and the problems of large cleaning and repairing workload still exist in the follow-up process. Currently, there are more and more solutions for temporary protection with peelable coatings. The construction period of a large ship is generally more than one year, the adhesive force between the coated strippable paint and the organic primer is increased along with the time extension, and therefore the strippable paint needs to have the complete strippable performance of more than one year. As the common water-based strippable coating is formed by thermoplastic resin, the water resistance is poor, the coating is easy to foam and wrinkle or even peel off when meeting rain, and the water resistance is required to be improved. In the actual use process, the time span is large, and hot summer and cold winter are needed. Under the condition of high temperature, a paint film of the thermoplastic water-based strippable paint is softened, even when the temperature is higher than the glass transition temperature of the paint, the strength of the paint film is reduced, the performance is poor, and the stripping process is easy to break; in cold winter, especially in northern China, the brittleness of a part of a paint film is increased below zero, the paint film has no extensibility and has no strippability at all.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects and shortcomings in the background technology and providing the water-based strippable coating which is good in water resistance, good in flexibility and good in strippable performance under high and low temperature conditions.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the high and low temperature resistant water-based strippable protective coating comprises the following components in parts by weight:

wherein, the anionic aliphatic polyether polyurethane dispersoid is specially named Tesmann E251 resin.

Furthermore, the glass transition temperature Tg of the acrylic emulsion is more than or equal to 60 ℃.

Further, the anti-sticking and slip agent is one or more of organic ester type, water-based silicone oil type and water-based silicon fluorine modified type.

Further, the defoamer is a polyether siloxane copolymer.

Further, the leveling agent is a polyether siloxane copolymer.

Further, the thickening agent is one or more of polyether polyurethane associative type or cellulose type thickening agent.

Further, the film-forming assistant is an alcohol ether film-forming assistant.

Preferably, the film-forming assistant is one of dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether and tripropylene glycol n-butyl ether.

The invention also provides a preparation method of the high and low temperature resistant water-based strippable protective coating, which comprises the following specific steps: firstly adding an anionic aliphatic polyether polyurethane dispersoid, sequentially adding an acrylic emulsion, an anti-sticking slipping agent, a defoaming agent, a leveling agent, a thickening agent and a film-forming auxiliary agent under a stirring state, controlling the stirring speed to be 500 plus materials at 1000r/min, wherein the feeding time of each raw material is 3-5 min, stirring for 8-15 min after adding, then adding the next raw material, stirring for 20-30 min at the speed of 500 plus materials at 1000r/min, filtering and subpackaging.

Compared with the prior art, the invention has the following advantages:

(1) the anionic aliphatic polyether polyurethane dispersoid and the acrylic emulsion are selected as film forming substances, water is used as a dispersing medium, the price is low, the smell is small, no pollution is caused, the storage, the transportation and the use processes are safe and environment-friendly, the application performance is good, the construction process is simple, and the construction tools can be directly washed by water;

(2) the acrylic resin with higher glass transition temperature is selected to improve the hardness of a thermoplastic paint film at higher temperature in summer, so that the strength of the paint film is not reduced due to too soft, and the complete stripping performance of the paint film at higher temperature is improved;

(3) the special modified resin Tesmann E251 is selected to improve the long-acting complete stripping performance and water resistance of the paint film under the conditions of higher temperature (60 ℃) and low temperature (-20 ℃).

Generally speaking, the high and low temperature resistant water-based strippable protective coating prepared by the invention is a thermoplastic single-component normal temperature curing film-forming coating, and can be coated on various metal plates, various metal plates and organic coatings such as epoxy coatings, polyurethane coatings, acrylic acid and the like. The peelable protective coating not only can be completely peeled for a long time at the temperature of 60 ℃, but also has good paint film flexibility and no brittleness at the temperature of-20 ℃, and is completely peeled for a long time, and compared with the common water-based peelable coating, the water resistance and the weather resistance of the peelable protective coating are greatly improved.

Detailed Description

In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.

Unless otherwise specifically stated, various raw materials, reagents, instruments and the like used in the present invention are commercially available or may be self-prepared by existing methods.

Example 1:

an embodiment of the high and low temperature resistant water-based strippable protective coating comprises the steps of weighing 60g of E251 type anionic aliphatic polyether polyurethane dispersoid, uniformly dispersing the dispersoid at a stirring speed of 500r/min by using a stirring disperser, sequentially adding 10gYT2700 acrylic emulsion, 2g82W anti-sticking and slipping agent, 0.3g902W defoaming agent, 0.2g TEGO450 leveling agent, 0.5g299 thickening agent and 5g DPnB film forming auxiliary agent, stirring and feeding each raw material, feeding each raw material for 3min, stirring for 8min after the feeding, adding the next raw material, stirring for 20min at 1000r/min after all the raw materials are added, uniformly mixing, coating a strippable coating at the bottom of intergard5555 under the room temperature condition to prepare a test sample, and testing the performance after curing for 24h at normal temperature.

Example 2:

the invention relates to an embodiment of a high and low temperature resistant water-based strippable protective coating, which is characterized in that 85g E251 type anionic aliphatic polyether polyurethane dispersoid is weighed, a stirring disperser is used for uniformly dispersing at a stirring speed of 800r/min, 6g Lubo 980 acrylic emulsion, 6g9137W anti-sticking lubricant, 0.2g TEGO810 defoaming agent, 0.4g TEGO4100 leveling agent, 0.3g299 thickening agent and 3g DPM film forming aid are sequentially added, each raw material is stirred and fed in a simultaneous manner, each raw material feeding process is 4min, after the raw materials are added, the next raw material is added after the raw materials are stirred for 11min, the raw materials are stirred at 800r/min for 25min and mixed uniformly, a strippable coating is coated on an intergard5555 bottom under the condition of room temperature to prepare a test sample, and the performance is tested after the raw materials are cured for 24h at the normal temperature.

Example 3:

the invention relates to an embodiment of a high and low temperature resistant water-based strippable protective coating, which is characterized in that 70g of E251 type anionic aliphatic polyether polyurethane dispersoid is weighed, a stirring disperser is used for uniformly dispersing at a stirring speed of 1000r/min, 5g of DS-7250H acrylic emulsion, 6g of 737 anti-sticking slip agent, 0.3g of TEGO810 defoaming agent, 0.2g of TEGO4100 leveling agent, 0.6g of 299 thickening agent and 8g of DPM film forming additive are sequentially added, each raw material is stirred and fed in at the same time, each raw material is fed in the process of 5min, the next raw material is added after the raw material is stirred for 15min, all the raw materials are added, the mixture is stirred for 30min at 1000r/min and mixed uniformly, a strippable coating is coated at the bottom of intergard5555 under the room temperature condition to prepare a test sample, and the performance is tested after the room temperature curing is carried out for 24H.

Example 4:

the invention relates to an embodiment of a high and low temperature resistant water-based strippable protective coating, which is characterized in that 65g E251 type anionic aliphatic polyether polyurethane dispersoid is weighed, a stirring disperser is used for uniformly dispersing at a stirring speed of 1000r/min, 3g DS-7250H acrylic emulsion, 6g737 anti-sticking slip agent, 0.8g TEGO810 defoaming agent, 0.2g TEGO4100 leveling agent, 0.6g299 thickening agent and 8g DPnP film forming auxiliary agent are sequentially added, each raw material is stirred and fed in the feeding process for 5min, the next raw material is added after the raw materials are added, the raw materials are stirred for 10min and then mixed uniformly at 600r/min after all the raw materials are added, a strippable coating is coated on the bottom of intergard5555 under the condition at room temperature to prepare a test sample, and the performance is tested after the raw materials are cured for 24H at room temperature.

Example 5:

the invention relates to an embodiment of a high and low temperature resistant water-based strippable protective coating, which is characterized in that 78g E251 type anionic aliphatic polyether polyurethane dispersoid is weighed, a stirring disperser is used for uniformly dispersing at a stirring speed of 700r/min, 7g DS-7250H acrylic emulsion, 5g737 anti-sticking slip agent, 0.6g TEGO810 defoaming agent, 0.5g TEGO4100 flatting agent, 1g299 thickening agent and 9g TPnB film forming auxiliary agent are sequentially added, each raw material is stirred and fed in at the same time, each raw material is fed in 5min, after the feeding is finished, the next raw material is added after stirring for 10min, all the raw materials are added, the mixture is stirred at 900r/min for 22min and mixed uniformly, a strippable coating is coated at the bottom of intergard5555 under the condition to prepare a test sample, and after the normal temperature curing is carried out for 24H, and the performance is tested.

Comparative example 1:

the invention relates to a comparative example of a high and low temperature resistant water-based strippable protective coating, which is prepared by weighing 70g of a fumitory 4220 water-based polyurethane dispersion, uniformly dispersing at a stirring speed of 800r/min by using a stirring disperser, sequentially adding 5g of DS-7250H acrylic emulsion, 3g of 737 anti-sticking and slipping agent, 0.8g of TEGO810 defoaming agent, 0.5g of TEGO4100 leveling agent, 1g of 299 thickening agent and 10g of DPM film forming aid, stirring each raw material while feeding, feeding each raw material for 5min, stirring for 15min after the feeding, adding the next raw material, stirring for 25min at 800r/min after all the raw materials are added, uniformly mixing, coating a strippable coating at the bottom of intergard5555 under the condition of room temperature to prepare a test sample, and testing the performance after curing for 24H at room temperature.

Comparative example 2:

the invention relates to a comparative example of a high and low temperature resistant water-based strippable protective coating, which is prepared by weighing 70g of obvious chemical engineering EM102 water-based polyurethane dispersoid, uniformly dispersing the dispersoid at a stirring speed of 800r/min by a stirring disperser, sequentially adding 5g of DS-7250H acrylic emulsion, 6g of 737 anti-sticking and slip agent, 0.3g of TEGO810 defoaming agent, 0.2g of TEGO4100 leveling agent, 0.6g of 299 thickening agent and 8g of DPM film forming aid, stirring each raw material while feeding, feeding each raw material for 4min, stirring for 10min after the feeding, adding the next raw material, stirring for 25min at 800r/min after all the raw materials are added, uniformly mixing, coating a strippable coating at the bottom of intergard5555 under the condition of room temperature to prepare a test sample, and testing the performance after curing for 24H at room temperature.

Comparative example 3:

the invention relates to a comparative example of a high and low temperature resistant water-based strippable protective coating, which is prepared by weighing 70g of 3240 g of water-based polyurethane dispersoid, uniformly dispersing the mixture by a stirring disperser at a stirring speed of 800r/min, sequentially adding 5g of DS-7250H acrylic emulsion, 6g of 737 anti-sticking and slip agent, 0.3g of TEGO810 defoaming agent, 0.2g of TEGO4100 leveling agent, 0.6g of 299 thickening agent and 8g of DPM film-forming auxiliary agent, stirring and feeding each raw material simultaneously, feeding each raw material for 5min, stirring for 10min after the feeding, adding the next raw material, stirring for 25min at 800r/min after all the raw materials are added, uniformly mixing, coating a strippable coating at the bottom of Intergard5555 under the room temperature condition to prepare a test sample, and testing the performance after curing for 24H at normal temperature.

Comparative example 4:

the invention relates to a comparative example of a high and low temperature resistant water-based strippable protective coating, which is prepared by weighing 70g of Dow PC25 water-based acrylic resin, uniformly dispersing the mixture by a stirring disperser at a stirring speed of 800r/min, sequentially adding 5g of DS-7250H acrylic emulsion, 6g of 737 anti-sticking and slipping agent, 0.3g of TEGO810 defoaming agent, 0.2g of TEGO4100 leveling agent, 0.6g of 299 thickening agent and 8g of DPM film forming aid, stirring each raw material while feeding, feeding each raw material for 2min, stirring for 10min after the feeding, adding the next raw material, stirring for 25min at 800r/min after all the raw materials are added, uniformly mixing, coating a strippable coating at the bottom of intergard5555 under a room temperature condition to prepare a test sample, and testing the performance after curing for 24H at normal temperature.

The data of the performance test of each of the above examples and comparative examples are shown in Table 1

TABLE 1

As can be seen from the test results in Table 1, compared with the common water-based strippable coating, the strippable protective coating provided by the invention has greatly improved water resistance, is easy to completely strip at-20 ℃ to 60 ℃, has no residue and no damage to the primer, has long-term complete strippability, and is particularly suitable for temporarily protecting the surfaces of various metal plates and organic coating matrixes such as epoxy coatings, polyurethane coatings and acrylic acid.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, the implementation steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.