Low formaldehyde melamine adhesive with expanding characteristic and preparation method
A technology of melamine and low free formaldehyde, applied in the field of preparation of water-based low free formaldehyde melamine resin, can solve the problems of increasing the cost of resin, affecting the mechanical properties and service performance of adhesives and their products, and achieving the effect of excellent storage performance
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0012] Add appropriate proportions of formaldehyde, melamine and water into the reactor, and the molar ratio of formaldehyde / melamine is 1.5-2.5. Adjust pH with Lewis base or acid, in the range of 8-12. After the mixture is reacted at 50°C-80°C for 1-2 hours, 1%-10% of organic substances are added. Continue the reaction at 50°C to 100°C for 2-4 hours. When the viscosity reached 30-60 cps, the mixture was cooled slowly. If necessary, the pH value can be adjusted to between 8.5 and 10 to obtain melamine resin.
[0013] The obtained melamine resin has the following typical properties:
[0014] Solid content 50%
[0015] Viscosity 30-60cps
[0016] PH value 9.2-9.7
[0017] Specific gravity 1.22g / ml
[0018] Free formaldehyde 0.1%
[0019] Storage period 14 days
Embodiment 2
[0021] The melamine resin in Example 1 is sent into the feeding tank of the spray dryer, and the liquid glue is sent into the high-speed centrifugal atomizer by the speed-regulating feed pump, and the misty glue enters the drying main tower and is heated by the hot air from the heating furnace. When heated (180°C), the moisture in the glue liquid evaporates quickly, and part of the powdered glue falls into the lower part of the drying tower (100°C), and the residence time is about 10 seconds. The prepared powder melamine formaldehyde adhesive has the following characteristics:
[0022] Appearance white powder
[0023] Particle size <80 mesh
[0024] Moisture content 3%
[0025] Apparent density 0.6-0.8
[0026] Formaldehyde content 0.3%
[0027] Storage period 1 year
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com