Ningbo DSS Intelligent Technology Co., Ltd , https://www.dsscosmetics.com
The method of manufacturing the acrylic nanoemulsion of Example 4 includes the following steps:
1. Add the first mixture of unsaturated monomer, solvent and initiator in the No. 1 reaction vessel, stir, pass nitrogen, heat to 80~110°C for 1.5~2h; the first unsaturated monomer contains Methyl methacrylate, butyl acrylate, butyl methacrylate, methacrylic acid, their weights (g) are: 100, 200, 100, and 8 solvents are n-butanol, weight is 7g, and the initiator is used Benzoyl oxide, weight 1.0 g;
2. The second mixture of unsaturated monomer, solvent and initiator is added dropwise into the reaction vessel I. The dropping time is 0.5~1h, and the temperature is kept between 80~110°C for 1~1.5h; The unsaturated monomers include methyl methacrylate, butyl acrylate, butyl methacrylate, and methacrylic acid. Their weights (g) are: 75, 150, 75, and 12 in order; the solvent is n-butanol, and the weight is For 8g, the initiator used benzyl peroxide and weighed 0.5g.
3. The third mixture of unsaturated monomer, solvent and initiator is added dropwise into the reaction vessel I. The dropping time is 0.5~1h, and the incubation time is 80~110°C for 1.5~2h; the third part is not The saturated monomers include methyl methacrylate, butyl acrylate, butyl methacrylate, acrylic acid, maleic anhydride, and their weights (g) are: 75, 150, 75, 10, 10; n-Butanol, weight 10 g, initiator used benzyl peroxide, weight 0.5 g.
4. Add the PH regulator and demineralized water to the No. 2 reaction vessel, stir, and transfer the material in the No. 1 reaction vessel to No. 2 reaction vessel and stir and emulsify for 1 to 2 hours; wherein: the pH adjuster uses triethylamine And N, N dimethyl ethanolamine, their weight are 3g, the weight of softened water is 150g;
5. The material obtained in step D is evacuated to remove solvent, vacuum degree of vacuum is 500-700 mmHg, and 120 mesh copper filter is used to filter out larger particles to obtain acrylic nanoemulsion.
The properties of the six acrylic nanoemulsions of Examples 1 to 6 described above are shown in Table 3.
(6) Mechanism of action:
The mechanism of nano-TiOx on the coating: nano-TiOx particles are small, large specific surface area, many surface atoms, high surface energy, surface atoms are insufficiently coordinated, have a strong surface activity and super-adsorption capacity, added in the coating, Easily cooperates with the oxygen in the resin to increase the bond strength between the molecules and the coating performance and the bonding strength between the coating and the substrate; nano-TiOx has special optical characteristics that are not available in conventional materials, and it is ubiquitous The “blue shift†phenomenon has a reflectivity of more than 85% for long-wave, mid-wave, and infrared wavelengths of ultraviolet rays, and the nano-TiOx optical reflection spectrum has good repeatability. Therefore, it can achieve the purpose of shielding ultraviolet rays in coatings (see Fig. 1). The anti-aging properties of the coating and the small size effect of nano-TiOx make it produce a wetting action, forming a dense "nano-coating film" at the interface of the coating layer, greatly improving the washability of the coating and the self-cleaning properties of the coating surface; nano-TiOx Due to the unique spatial network structure, there are a large number of unsaturated residual bonds and hydroxyl groups in different bonding states on the surface, which can produce good affinity with the coating system. In order to improve the suspension stability of the coating. After the coating dried, the nanoparticles were tightly arranged to form a complete air insulation layer (Figure 3).
(7) Application:
1. Nano-environmental insulation coating material is a special emulsion paint developed and produced using advanced nanotechnology. It has excellent ability to reflect infrared rays and its unique micro-porous structure, constitute a heat insulation layer, and can reduce the temperature in summer. In winter, heat loss can be reduced. “Winter warm and cool in summer†can save energy. Using international standard colors can achieve any color. And with good adhesion, high elasticity and compactness, waterproof, anti-corrosion, sound insulation and other functions. Painted in wet and wet surfaces, the product's life span can be as long as 10 years. After more than two years of product coating on the roof of the plant, external walls, petrochemical equipment, storage tanks, storage tanks, pipelines, trunks, containers, ships, movable board rooms, warehouses, cold storage, etc., it has a very good effect and achieves better results. The social benefits and considerable economic benefits. It is an environmentally friendly green packaging material.
2, product performance indicators:
Project indicator table dry ≤30min
Drying time (dry) ≤24h
Contrast ratio ≥ 0.93
Alkali resistance (24h) No abnormal water resistance (48h) No abnormal wash resistance >2000 times
3, the operating requirements density: about 1.3g/cm3
Dry film thickness: ≥30um/pass wet film thickness: 60~80um/channel Theoretical usage: 110~140g/m2
Drying time: (standard environment) surface dry ≤ 1h hard dry ≤ 24h
Coating interval:
Coating number: 2 tracks, dry film thickness ≥ 60um
Surface treatment: scrape acrylic putty.
Substrate treatment: Flat and no attachments are required. No emptying, moisture content less than 10%. Before spraying, different materials (metals, plates, cements, etc.) are used and special primers are used for treatment.
Nano thermal insulation coating material research (2)
The manufacturing method of the acrylic nanoemulsion of Examples 1 to 6 described above is only explained by the manufacturing method of Example 4 as follows:
table 3
project
Example
1
2
3
4
5
6
Self-emulsification
excellent
good
excellent
good
excellent
good
Thermal stability
excellent
good
excellent
good
excellent
good
Mechanical stability
excellent
good
excellent
good
excellent
good
Grinding efficiency
good
excellent
good
excellent
good
excellent
Film water resistance (h)
120
168
96
120
96
168
Ambient temperature
5°C20°C0 Shortest
24h12h8h longest
not limited