Grafted nano ambary fiber crystal whisker modified urea formaldehyde resin adhesive and preparation method thereof
A technology of kenaf fiber and urea-formaldehyde resin, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor water resistance, reduced bonding strength, increased product cost, etc., to reduce The amount of formaldehyde released, the effect of increasing the content of the crystalline region, and reducing the viscosity of the resin
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0025] Example 1
[0026] A grafted nano-kenaf fiber whisker modified urea-formaldehyde resin adhesive is prepared from formaldehyde, urea, polyvinyl alcohol and a reaction enhancer, wherein the molar ratio of formaldehyde to urea is 1.07:1, and each raw material is formulated For comparison, see Table 1:
[0027] Table 1 The molar ratio of formaldehyde to urea is 1.07:1 urea-formaldehyde resin raw material ratio
[0028]
[0029] Wherein, the reaction enhancer (ie, crosslinking enhancer) is acrylic acid grafted nano-kenaf fiber whiskers;
[0030] The solid content of the reaction enhancer is 100%.
[0031] A preparation method of the grafted nano-kenaf fiber whisker modified urea-formaldehyde resin adhesive includes the following steps:
[0032] 1) Put 591.2 parts by weight of 37% industrial formaldehyde into the reactor, adjust the pH to 7.0 with lye, add 5 parts by weight of reaction enhancer, heat up to 50°C, add 30 parts by weight of polyvinyl alcohol solution, and keep it warm for...
Example Embodiment
[0050] Example 2
[0051] A grafted nano-kenaf fiber whisker modified urea-formaldehyde resin adhesive is prepared from formaldehyde, urea, polyvinyl alcohol and a reaction enhancer, wherein the molar ratio of formaldehyde to urea is 1:0.98, and each raw material is formulated For comparison, see Table 3 below:
[0052] raw material Moles content,% Weight fraction Remarks formaldehyde7.1237569.8 Response enhancer 10010 Polyvinyl alcohol 1050 Urea7.0499.8430.2 U1=210.8 copies U2=140.5 copies U3=78.9 copies Acid solution (formic acid + ammonium chloride) 30 Right amount 50% each Lye (sodium hydroxide + triethanolamine) 30 Right amount 50% each
[0053] Prepare materials according to the molar ratio of formaldehyde to urea of 1:0.98, and the reaction steps include:
[0054] 1) Put 569.8 parts by weight of 37% industrial formaldehyde into the reactor, adjust the pH to 7.0 with lye, add 10 parts by weight of reaction enhancer, heat up to 50°C, add 50 parts by wei...
Example Embodiment
[0068] Experimental example
[0069] Add 0.5% ammonium chloride and 0.3% citric acid to the urea-formaldehyde resins of Example 1-2 and Comparative Example 1-2, and then add 30% flour to make a three-layer 400×400 mm plywood.
[0070] Poplar veneer: moisture content is dried to 6-10%; thickness 1.5mm;
[0071] The veneer adhesive used the product of Example 1-2 of the present invention and the product of Comparative Example 1-2.
[0072] Prepare plywood according to the following normal process:
[0073] (1) Gluing: double-sided sizing of the core board, the amount of glue is 320-360g / m 2 ;
[0074] (2) Aging method and time: closed aging, 20-30 minutes;
[0075] (3) Preload pressure and time: 40 minutes of preload, pressure 0.9MPa;
[0076] (4) Hot pressing pressure: 1.0MPa, hot pressing temperature is 120-130oC, hot pressing time is high pressure 90s / mm.
[0077] According to GB / T17657-1999 "Experimental method of physical and chemical properties of wood-based panels and decorative wood-...
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.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap