Water-based three-proofing coating containing Teflon and preparation method of water-based three-proofing coating

Abstract

The invention provides a teflon-containing water-based three-proofing coating and a preparation method thereof, and relates to the technical field of building waterproof materials. The water-based three-proofing coating containing Teflon is prepared from the following raw materials in percentage by mass: 40 to 50 percent of water-based acrylic resin, 10 to 15 percent of modified Teflon nano slurry, 5 to 8 percent of nano silicon dioxide, 1 to 2 percent of a silane coupling agent, 0.3 to 0.5 percent of a de-foaming agent, 0.5 to 1 percent of a wetting agent, 0.1 to 0.2 percent of a preservative and the balance of de-ionized water, the defoaming agent is an organic silicon defoaming agent, the wetting agent is a nonionic wetting agent, and the preservative is a BIT preservative. According to the invention, the water-based acrylic resin is taken as a base material, the modified Teflon PTFE nano-particles are added, the three-proofing coating with high weather resistance and low surface energy, namely the waterproof, anticorrosive and antifouling coating is realized, PTFE is stably dispersed in a water-based system through a nano-dispersion technology and modification of the silane coupling agent, and then the long-acting three-proofing function is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building waterproof materials, in particular to a three-proofing coating with high weather resistance and low surface energy, and a preparation method thereof, which is based on water-based acrylic resin and realizes high weather resistance and low surface energy by adding modified Teflon nanoparticles. BACKGROUND

[0002] During the use of electronic devices, mechanical parts and many other products, various challenges from the environment are often faced, such as humid air, corrosive chemicals and dust, etc. These factors can seriously affect the performance and service life of the products. To deal with such problems, three-proofing coatings have emerged. Three-proofing coatings can form a protective film on the surface of the object, which can prevent moisture, salt spray, mold and other protective effects, and are widely used in many fields such as electronics, aerospace, ships and automobiles, significantly improving the reliability and stability of products in harsh environments.

[0003] Traditional waterproof coatings have problems of easy aging, poor stain resistance and insufficient chemical corrosion resistance. Teflon (PTFE) has extremely low surface energy (≤18 mN / m) and excellent chemical inertness, but it is difficult to be compatible with water-based systems and is difficult to disperse uniformly during the preparation of the coating, which can easily lead to unstable coating performance, such as local decline in protective performance, coating peeling and other phenomena. And the existing preparation method is relatively complex in process control, requires high equipment, and the prepared coating needs to be improved in terms of drying speed, film quality, etc., which limits its large-scale production and application.

[0004] Therefore, the skilled person in the art provides a water-based three-proofing coating containing Teflon and a preparation method thereof to solve the problems raised in the background art. SUMMARY

[0005] (I) Technical problems to be solved

[0006] In view of the deficiencies of the prior art, the present application provides a water-based three-proofing coating containing Teflon and a preparation method thereof, which realizes long-acting three-proofing function by stabilizing the dispersion of PTFE in the water-based system through nano-dispersion technology and silane coupling agent modification, and solves the problems of easy aging, poor stain resistance and insufficient chemical corrosion resistance of traditional waterproof coatings.

[0007] (II) Technical solutions

[0008] To achieve the above purpose, the present application is realized by the following technical solutions:

[0009] A Teflon-containing water-based three-proofing paint is composed of the following raw materials in mass percentage: water-based acrylic resin 40-50%, modified Teflon nano slurry 10-15%, nano-silicon dioxide 5-8%, silane coupling agent 1-2%, defoaming agent 0.3-0.5%, wetting agent 0.5-1%, preservative 0.1-0.2%, and the rest is deionized water.

[0010] Further, it is composed of the following raw materials in mass percentage: water-based acrylic resin 40%, modified Teflon nano slurry 10%, nano-silicon dioxide 5%, silane coupling agent 1%, defoaming agent 0.3%, wetting agent 0.5%, preservative 0.1%, and the rest is deionized water.

[0011] Further, it is composed of the following raw materials in mass percentage: water-based acrylic resin 45%, modified Teflon nano slurry 13%, nano-silicon dioxide 6.5%, silane coupling agent 1.5%, defoaming agent 0.4%, wetting agent 0.8%, preservative 0.2%, and the rest is deionized water.

[0012] Further, it is composed of the following raw materials in mass percentage: water-based acrylic resin 50%, modified Teflon nano slurry 15%, nano-silicon dioxide 8%, silane coupling agent 2%, defoaming agent 0.5%, wetting agent 1%, preservative 0.2%, and the rest is deionized water.

[0013] Further, the preparation process of the modified Teflon nano slurry is as follows:

[0014] 1) Mix PTFE powder with a particle size of 100-200 nm and silane coupling agent at a ratio of 10:1, and ultrasonically disperse for 30 min;

[0015] 2) Then add deionized water and dispersant to prepare a stable slurry with a solid content of 20%, and obtain the modified Teflon nano slurry.

[0016] Further, the silane coupling agent is selected from KH-550 coupling agent, the defoaming agent is selected from silicone-based defoaming agent, the wetting agent is selected from non-ionic wetting agent, and the preservative is selected from BIT preservative.

[0017] Further, a preparation method of a Teflon-containing water-based three-proofing paint comprises the following steps:

[0018] S1. Pre-dispersion

[0019] According to the raw material ratio, the water-based acrylic resin, deionized water, and wetting agent are added into a high-speed dispersion kettle for dispersion mixing;

[0020] S2. Nano-component addition

[0021] Then, the modified PTFE slurry and nano-SiO2 are sequentially added into the high-speed dispersion kettle, and the rotation speed is increased for dispersion mixing.

[0022] S3. Additive mixing

[0023] Then, the defoaming agent and the preservative are added into the high-speed dispersion kettle, and low-speed stirring mixing is performed to obtain a slurry.

[0024] S4. Filtration and packaging

[0025] The slurry is filtered through a 200-mesh screen, and the viscosity and the solid content are detected to be greater than or equal to 80 KU and greater than or equal to 45%, respectively. After the detection is qualified, the slurry is filled to obtain the water-based three-protection coating.

[0026] Further, the dispersion rotation speed in step S1 is 500 rpm, and the dispersion time is 10 min.

[0027] Further, the rotation speed in step S2 is increased to 1500 rpm, and the dispersion time is 30 min.

[0028] Further, the low-speed stirring rotation speed in step S3 is 300 rpm, and the stirring time is 15 min.

[0029] (Three) beneficial effects

[0030] The application provides a water-based three-protection coating containing Teflon and a preparation method thereof.

[0031] 1. The application provides a water-based three-protection coating containing Teflon and a preparation method thereof. The water-based three-protection coating is prepared by using water-based acrylic resin as a base material and adding modified Teflon PTFE nanoparticles, so that the three-protection coating with high weather resistance and low surface energy, i.e., the coating with water resistance, corrosion resistance and stain resistance, is realized.

[0032] 2. The application provides a water-based three-protection coating containing Teflon and a preparation method thereof. The PTFE is stably dispersed in the water-based system by using the nano-dispersion technology and the silane coupling agent modification, so that the long-acting three-protection function is realized. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0034] Embodiment 1:

[0035] The embodiment provides a Teflon-containing water-based three-protection coating, which is composed of the following raw materials in percentage by mass: 40% of water-based acrylic resin, 10% of modified Teflon nano slurry, 5% of nano silicon dioxide, 1% of silane coupling agent, 0.3% of defoaming agent, 0.5% of wetting agent, 0.1% of preservative, and the rest of deionized water.

[0036] The preparation process of the modified Teflon nano slurry is as follows:

[0037] 1) The PTFE powder with a particle size of 150 nm is mixed with the silane coupling agent at a ratio of 10:1, and ultrasonic dispersion is performed for 30 min;

[0038] 2) Then, deionized water and a dispersant are added to prepare a stable slurry with a solid content of 20%, and the modified Teflon nano slurry is obtained.

[0039] The silane coupling agent is selected from KH-550 coupling agent, the defoaming agent is selected from a silicone-based defoaming agent, the wetting agent is selected from a non-ionic wetting agent, and the preservative is selected from a BIT preservative.

[0040] The preparation method of the Teflon-containing water-based three-protection coating comprises the following steps:

[0041] S1. Pre-dispersion

[0042] The water-based acrylic resin, deionized water and wetting agent are added into a high-speed dispersion kettle according to the raw material ratio for dispersion mixing, the rotating speed is 500 rpm, and the dispersion time is 10 min;

[0043] S2. Nano component addition

[0044] The modified PTFE slurry and nano SiO2 are sequentially added into the high-speed dispersion kettle, and the dispersion mixing is performed by increasing the rotating speed, the rotating speed is increased to 1500 rpm, and the dispersion time is 30 min;

[0045] S3. Additive mixing

[0046] The defoaming agent and preservative are added into the high-speed dispersion kettle, and the mixing is performed by low-speed stirring, the rotating speed is 300 rpm, the stirring time is 15 min, and the slurry is obtained;

[0047] S4. Filtration and packaging

[0048] The slurry is filtered through a 200-mesh screen, and whether the viscosity is greater than or equal to 80 KU and the solid content is greater than or equal to 45% is detected, the filling is performed after the detection is qualified, and the water-based three-protection coating is obtained.

[0049] Example 2:

[0050] The embodiment provides a Teflon-containing water-based three-protection coating, which is composed of the following raw materials in percentage by mass: water-based acrylic resin 45%, modified Teflon nano slurry 13%, nano silicon dioxide 6.5%, silane coupling agent 1.5%, defoaming agent 0.4%, wetting agent 0.8%, preservative 0.2%, and the rest is deionized water.

[0051] The preparation process of the modified Teflon nano slurry is as follows:

[0052] 1) The PTFE powder with a particle size of 150 nm is mixed with the silane coupling agent at a ratio of 10:1, and ultrasonic dispersion is performed for 30 min;

[0053] 2) Then, deionized water and a dispersant are added to prepare a stable slurry with a solid content of 20%, and the modified Teflon nano slurry is obtained.

[0054] The preparation method of the Teflon-containing water-based three-protection coating comprises the following steps:

[0055] S1. Pre-dispersion

[0056] The water-based acrylic resin, deionized water and wetting agent are added into a high-speed dispersion kettle according to the raw material ratio for dispersion mixing, the rotation speed is 500 rpm, and the dispersion time is 10 min;

[0057] S2. Nano component addition

[0058] The modified PTFE slurry and nano SiO2 are sequentially added into the high-speed dispersion kettle, and the dispersion mixing is performed by increasing the rotation speed, the rotation speed is increased to 1500 rpm, and the dispersion time is 30 min;

[0059] S3. Additive mixing

[0060] The defoaming agent and preservative are added into the high-speed dispersion kettle, and low-speed stirring mixing is performed, the rotation speed is 300 rpm, the stirring time is 15 min, and the slurry is obtained;

[0061] S4. Filtration and packaging

[0062] The slurry is filtered through a 200-mesh screen, and whether the viscosity is greater than or equal to 80 KU and the solid content is greater than or equal to 45% is detected, the filling is performed after the detection is qualified, and the water-based three-protection coating is obtained.

[0063] Embodiment 3:

[0064] The embodiment provides a Teflon-containing water-based three-protection coating, which is composed of the following raw materials in percentage by mass: water-based acrylic resin 45%, modified Teflon nano slurry 13%, nano silicon dioxide 6.5%, silane coupling agent 1.5%, defoaming agent 0.4%, wetting agent 0.8%, preservative 0.2%, and the rest is deionized water.

[0065] The preparation process of modified Teflon nanoparticles is as follows:

[0066] 1) PTFE powder (150 nm in particle size) was mixed with silane coupling agent at a ratio of 10:1 and ultrasonically dispersed for 30 min;

[0067] 2) Deionized water and a dispersant were then added to prepare a stable slurry with a solid content of 20%, thereby obtaining a modified Teflon nano-slurry.

[0068] The preparation method of the water-based three-proof coating containing Teflon comprises the following steps:

[0069] S1. Pre-dispersion

[0070] Add water-based acrylic resin, deionized water and wetting agent into the high-speed dispersing kettle according to the raw material ratio and disperse and mix them at a speed of 500 rpm and a dispersing time of 10 minutes;

[0071] S2. Addition of nano components

[0072] Then, add modified PTFE slurry and nano-SiO2 into the high-speed dispersing kettle in sequence, increase the speed to 1500 rpm for dispersion mixing, and the dispersion time is 30 minutes;

[0073] S3. Additive mixing

[0074] Then add defoamer and preservative into the high-speed dispersing kettle, stir and mix at low speed, rotation speed 300 rpm, stirring time 15 min, to obtain slurry;

[0075] S4. Filter packaging

[0076] The slurry is passed through a 200-mesh sieve and tested to see whether the viscosity is ≥80KU and the solid content is ≥45%. After passing the test, the slurry is filled to obtain the water-based three-proof coating.

[0077] In the present invention, the raw material water-based acrylic resin serves as a base material to provide film-forming properties, the modified Teflon nano-paste has anti-fouling and corrosion-resistant functions, the nano-silica enhances wear resistance, the silane coupling agent modifies the surface of Teflon PTFE, the defoaming agent can eliminate bubbles, the wetting agent improves spreadability, the preservative can make the water-based three-proof coating mildew-proof, and deionized water adjusts the viscosity of the coating.

[0078] The technical parameters of the water-based three-proof coating containing Teflon are shown in Table 1 below:

[0079] Table 1 Technical parameters of water-based conformal coatings

[0080] Item Parameter Execution Standard Solid Content ≥45％ GB / T1725-2007 Tack Free Time (25℃) ≤1h GB / T16777-2008 Through Dry Time (25℃) ≤4h GB / T16777-2008 Contact Angle (Water) ≥110° (PTFE Modification Effect) GB / T30693-2014 Alkali Resistance (5% NaOH, 168h) No Blistering, Peeling GB / T9265-2009 Stain Resistance (Ink Rubbing) No Residue JG / T304-2011

[0081] The construction requirements for re-coating the water-based three-proof coating containing Teflon are as follows:

[0082] Base surface treatment: base layer moisture content ≤8%, no oil stains, loose materials;

[0083] Brushing process: rolling or spraying, recommended 2 times (interval 2h), dosage 1.5-2kg / m 2 ;

[0084] Environmental conditions: temperature 5-35℃, humidity ≤80%.

[0085] Industry standards should meet the following standards:

[0086] Waterproof performance: in line with GB / T 23445-2009 (type I) tensile strength ≥1.8MPa;

[0087] Preservation: pass GB 18582-2020, VOC ≤50g / L;

[0088] Weather resistance: pass GB / T 1865-2009, QUV aging 1000h without powdering.

[0089] In this paper, the following points need attention:

[0090] 1. The embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures can refer to general design.

[0091] 2. In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0092] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

Claims

1. A water-based three-proof coating containing Teflon, characterized in that: The invention is composed of the following raw materials in percentage by mass: 40-50% of waterborne acrylic resin, 10-15% of modified Teflon nano-paste, 5-8% of nano-silicon dioxide, 1-2% of silane coupling agent, 0.3-0.5% of defoaming agent, 0.5-1% of wetting agent, 0.1-0.2% of preservative, and the rest of deionized water.

2. The water-based three-proof coating containing Teflon according to claim 1, characterized in that: The invention is composed of the following raw materials in percentage by mass: 40% of water-based acrylic resin, 10% of modified Teflon nano-paste, 5% of nano-silica, 1% of silane coupling agent, 0.3% of defoaming agent, 0.5% of wetting agent, 0.1% of preservative, and the rest of deionized water.

3. The water-based three-proof coating containing Teflon according to claim 1, characterized in that: The invention is composed of the following raw materials in percentage by mass: 45% of water-based acrylic resin, 13% of modified Teflon nano-paste, 6.5% of nano-silica, 1.5% of silane coupling agent, 0.4% of defoaming agent, 0.8% of wetting agent, 0.2% of preservative, and the rest of deionized water.

4. The water-based three-proof coating containing Teflon according to claim 1, characterized in that: The invention is composed of the following raw materials in percentage by mass: 50% of water-based acrylic resin, 15% of modified Teflon nano-paste, 8% of nano-silica, 2% of silane coupling agent, 0.5% of defoaming agent, 1% of wetting agent, 0.2% of preservative, and the rest of deionized water.

5. The water-based three-proof coating containing Teflon according to claim 1, characterized in that: The preparation process of the modified Teflon nanoparticles is as follows: 1) PTFE powder (particle size 100-200 nm) was mixed with silane coupling agent at a ratio of 10:1 and ultrasonically dispersed for 30 min; 2) Deionized water and a dispersant were then added to prepare a stable slurry with a solid content of 20%, thereby obtaining a modified Teflon nano-slurry.

6. The water-based conformal coating containing Teflon according to claim 1, characterized in that: The silane coupling agent is KH-550 coupling agent, the defoaming agent is an organic silicon defoaming agent, the wetting agent is a non-ionic wetting agent, and the preservative is a BIT preservative.

7. A method for preparing a water-based three-proof coating containing Teflon, characterized in that: The following steps are involved: S1. Pre-dispersion Add water-based acrylic resin, deionized water and wetting agent into the high-speed dispersing kettle according to the raw material ratio and disperse and mix them; S2. Nanocomponent addition Then add modified PTFE slurry and nano-SiO2 into the high-speed dispersing kettle in sequence, and increase the speed to disperse and mix; S3. Additive mixing Then add defoamer and preservative into the high-speed dispersing kettle, stir and mix at low speed to obtain slurry; S4. Filter packaging The slurry is passed through a 200-mesh sieve and tested to see whether the viscosity is ≥80KU and the solid content is ≥45%. After passing the test, the slurry is filled to obtain the water-based three-proof coating.

8. The method for preparing a water-based conformal coating containing Teflon according to claim 7, characterized in that: In step S1, the dispersion speed is 500 rpm and the dispersion time is 10 min.

9. The method for preparing a water-based conformal coating containing Teflon according to claim 7, wherein: The rotation speed in step S2 is increased to 1500 rpm, and the dispersion time is 30 min.

10. The method for preparing a water-based conformal coating containing Teflon according to claim 7, characterized in that: The low-speed stirring speed in step S3 is 300 rpm, and the stirring time is 15 min.