Edge sealing coating adhesive capable of being cured at normal temperature and formed by self-leveling and preparation method of edge sealing coating adhesive

Abstract

The invention discloses a preparation method of an edge sealing coating adhesive capable of being cured at normal temperature and formed by self-leveling. Relates to the technical field of decorative materials, furniture production and whole house customized plate edge sealing. The existing mechanical edge sealing process has the problems of high equipment investment, high energy consumption, complicated operation and the like, limitation on special-shaped materials and VOC pollution. In the prior art, an edge sealing material which simultaneously meets the requirements of normal-temperature curing, self-leveling, no need of mechanical construction, special-shaped material edge sealing, environmental protection and the like is not seen. The invention provides the preparation method and the construction process of the edge sealing material which does not need mechanical equipment, is simple and convenient to operate and has excellent environment-friendly performance. The technical innovation points of the invention are as follows: a normal temperature curing technology (without heating equipment and large-scale machinery construction), a self-leveling molding characteristic (adaptive to special-shaped complex curved surfaces), low VOC emission (a water-based system and a solvent-free formula) and a dual-curing mechanism (light curing and moisture curing) are adopted, and any color can be modulated, so that the effect of a finished product is more perfect.

Description

Technical Field

[0001] The invention relates to the technical field of building decoration, furniture production and whole-house customized materials, and in particular to an environmentally friendly coating adhesive for plate edge sealing and a preparation method thereof. Background Art

[0002] 1. The traditional hot melt adhesive edge sealing process has problems such as large equipment investment, high energy consumption, and complex operation. The equipment cost is more than 500,000 yuan and the floor area is more than 20 square meters. Energy consumption>15kW / h, 2. The existing edge banding technology has limitations for special-shaped materials, and the qualified rate of special-shaped corner edge banding is less than 65%.

[0003] 3. The traditional process has VOC pollution problems, VOC emissions> 200mg / m³.

[0004] 4. There is no existing edge sealing material that can simultaneously meet the requirements of room temperature curing, self-leveling, no mechanical construction required, and environmental protection. Summary of the invention 1. Purpose of the invention: To provide an edge sealing material and construction process that does not require mechanical equipment, is easy to operate, and has excellent environmental performance 2. Technical solution: - Raw material composition (by weight): • 30-50 parts of waterborne polyurethane resin • Epoxy resin 10-20 parts • 5-10 parts of nano silicon dioxide • 3-8 parts of active diluent • Photoinitiator 0.5-2 parts • Leveling agent 0.1-0.5 parts • Deionized water balance Preparation method: (1) Mix waterborne polyurethane resin and epoxy resin at 50-70°C (2) Add nano-silicon dioxide for ultrasonic dispersion (3) Add active diluent, photoinitiator and leveling agent in sequence (4) After high-speed stirring for 30 minutes, add deionized water to adjust the viscosity 3. Innovation of the invention: - Room temperature curing technology (no heating equipment and large-scale mechanical construction required) - Self-leveling molding properties (adaptable to special-shaped and complex curved surfaces) - Low VOC emissions (water-based system + solvent-free formula) - Dual curing mechanism (light curing + moisture curing) Implementation Example

[0005] Raw material ratio: 1: 40 parts of waterborne polyurethane, specific model of raw materials (waterborne polyurethane resin brand) - RL-7500: Aliphatic waterborne polyurethane resin, solid content 55%±2, average particle size 153-197nm, suitable for textile, shoe printing and coating.

[0006] - Dispercoll U XP 2682: Anionic waterborne polyurethane dispersion with a solid content of 49-51% and a viscosity of <1000 mPa·s. It is used for footwear, packaging and low activation temperature bonding.

[0007] - UC-177: Light-curing aliphatic polyurethane acrylate, solid content 39-41%, viscosity 55 CPS, suitable for wood coatings and radiation curing scenarios.

[0008] 2: Nanosilica particle size parameters - Common particle size range: 7-15 nm (such as aqueous dispersion XD-S07S) or 7-40 nm (such as fumed silica CAB-O-SIL M-5).

[0009] - Modification type: hydrophilic (such as CAB-O-SIL M-5) or hydrophobic (such as SPC nano silica powder), which needs to be selected according to the compatibility of the resin.

[0010] Epoxy resin 15 parts, nano-SiO 2 8 parts, active diluent 5 parts, photoinitiator 1 part, leveling agent 0.3 parts, deionized water 30.7 parts Preparation steps: Prepare according to the above method to obtain edge sealing glue with a viscosity of 2000-3000mPa·s 3. Mechanical properties after curing - Tensile strength: 9.7-25 MPa (depending on the formulation).

[0011] - Elongation at break: 845% (typical value).

[0012] - Hardness: Pencil hardness 5H or above, friction coefficient ≥ 0.70.

[0013] - Wear resistance: wear loss <10 mg (CS17 / 750g / 500r).

[0014] - Resistance to hydrostatic pressure: ≥8.0 kPa (coated fabric).

[0015] 4. Environmental certification related data - Formaldehyde emission: in compliance with GB 18580-2017 standard (≤0.050 mg / m³). Some products have passed EU REACH and SGS certification.

[0016] - VOC content: The VOC content of water-based systems is extremely low (usually <50 g / L), meeting the requirements of green building material certification (such as GB / T22374, HG / T 5057).

[0017] - Heavy metals: The content of heavy metals such as lead and cadmium is lower than the limit of EU RoHS Directive.

[0018] 5. Construction environment parameters - Temperature: 5-35℃ is recommended. Avoid low temperature (<5℃) or high temperature (>35℃) that may affect the curing effect.

[0019] - Humidity: The construction environment humidity should be ≤85%, and the substrate should be dry (moisture content <10%).

[0020] - Ventilation: Maintain good ventilation during construction to ensure that the solvent evaporates and the curing reaction proceeds normally.

[0021] Note: For specific parameters, please refer to the technical documentation of the selected resin grade.

[0022] The amount of nano-silicon dioxide added is usually 1-5% (by weight), and the formula needs to be optimized through experiments.

Claims

1. A room temperature curable, self-leveling edge sealing coating adhesive and a preparation method thereof, characterized in that The following steps are involved: (1) Mixing waterborne polyurethane resin and epoxy resin at 50-70°C; (2) adding nano-silicon dioxide for ultrasonic dispersion; (3) Adding reactive diluent, photoinitiator and leveling agent in sequence; (4) Add deionized water to adjust the system viscosity to 1500-4000 mPa·s.

2. The preparation method according to claim 1, characterized in that The raw materials include by weight: 30-50 parts of waterborne polyurethane resin, 10-20 parts of epoxy resin, 5-10 parts of nano-silicon dioxide, 3-8 parts of active diluent, 0.5-2 parts of photoinitiator, 0.1-0.5 parts of leveling agent, and the balance of deionized water.

3. The preparation method according to claim 1, characterized in that The mixing time of step (1) is 10-30 minutes.

4. The preparation method according to claim 1, characterized in that The ultrasonic dispersion power of step (2) is 200-500W, and the time is 5-15 minutes.

5. The preparation method according to claim 1, characterized in that The active diluent is ethylene glycol diglycidyl ether or propylene glycol methyl ether acetate.

6. The preparation method according to claim 1, characterized in that The photoinitiator is 2-hydroxy-2-methylpropiophenone or 1-hydroxycyclohexyl phenyl ketone.

7. An edge sealing coating adhesive prepared by the method according to any one of claims 1 to 6, characterized in that: - Solid content 50-70%, surface drying time ≤30 minutes (25°C, 50%RH) Shore hardness A 60-80 VOC content ≤50g / L.

8. The application method of the edge sealing coating adhesive according to claim 7, characterized in that include: (1) Substrate surface pretreatment; (2) Apply glue by brushing / spraying. 9.(3) Allow to level naturally for 5-10 minutes; (4) UV curing for 10-30 seconds (wavelength 365nm, energy 500-1000mJ / cm²); (5) Cure at room temperature for 24 hours.