The effects of some flame retardant chemicals used in surface coating on the burning properties of MDF (Medium density fiberboard)

Most of the medium-density fiberboard (MDF) as an engineered woods need surface coating process before entering final products, such as furniture and building materials. The wood surface should be covered for surface protection from damage during service life as well as to enhance its appearance. Surface coating of MDF was conducted using epoxy acrylate resin either for clear and pigmented coatings. Titanium dioxide was used for white pigmented coatings. Coating was conducted at variation thickness level of 30 to 150 μm. Curing was carried out by using 350 kV electron beam accelerator at 1.35 mA current and 1.6 m/min conveyor speed to get the absorbed dose of 3 Mrad. Effect of coating thickness was evaluated by measuring the physical, mechanical and chemical properties of cured samples, i.e., hardness, gloss, transparency, adhesion, abrasion resistance, and chemical, solvent and stain resistance. Experimental results showed that pendulum hardness and abrasion resistance slightly increased whereas gloss, transparency and adhesion resistance decreased with increasing coating thickness, while chemical, solvent and stain resistance remains similar. In general, clear coating provides better properties than pigmented coating. Keywords: electron-beam; coating; epoxy-acrylate; pigment; medium-density fiberboard

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Facile surface hydrophobization of medium-density fiberboard (MDF) by silver deposition

Holzforschung ◽

10.1515/hf-2016-0106 ◽

2017 ◽

Vol 71 (4) ◽

pp. 337-340 ◽

Cited By ~ 6

Author(s):

Xiaodi Ji ◽

Minghui Guo

Keyword(s):

Crystal Structure ◽

Surface Coating ◽

Medium Density Fiberboard ◽

Water Repellent ◽

Medium Density ◽

X Ray Diffraction ◽

Silver Deposition ◽

X Ray ◽

Ag Particles ◽

Scanning Electron

Abstract A facile and effective method for the surface hydrophobization of medium-density fiberboards (MDFs) via the silver (Ag) mirror reaction has been investigated. The pristine MDF surface was treated with silver nitrate (AgNO3) and subsequently with glucose to reduce Ag ions into Ag particles, which led to dual-size surface roughness. The roughness and morphology of the Ag-coated MDF surface were characterized by scanning electron microscopy (SEM), and the elemental composition and the crystal structure of the surface were determined via energy-dispersive X-ray spectroscopy (EDXS) and X-ray diffraction (XRD) analyses. The wettability of the MDF surface was measured by contact angle (CA) measurements. The results indicated that pure Ag particles were successfully deposited onto the MDF surface without any impurities. The Ag surface coating was water repellent as indicated by a CA of 136°, which slightly decreased with time. The hydrophobicity was derived from the air trapped in the surface cavities and the dual-size roughness.

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Calcium carbonate modified urea–formaldehyde resin adhesive for strength enhanced medium density fiberboard production

RSC Advances ◽

10.1039/d1ra04316a ◽

2021 ◽

Vol 11 (40) ◽

pp. 25010-25017

Author(s):

Li Lu ◽

Yan Wang ◽

Tianhua Li ◽

Supeng Wang ◽

Shoulu Yang ◽

...

Keyword(s):

Calcium Carbonate ◽

Urea Formaldehyde ◽

Medium Density Fiberboard ◽

Urea Formaldehyde Resin ◽

Formaldehyde Resin ◽

Medium Density ◽

Ionic Bond ◽

Resin Adhesive ◽

Uf Resin ◽

Modified Urea

Reactions between CaCO3 and CH2O2 during polycondensation of UF resin produce Ca2+. Ionic bond complexation binds Ca2+ with UF resin. The UF resin crystalline percentage decreases from 26.86% to 22.71%. IB strength of resin bonded fiberboard increases from 0.75 to 0.94 MPa.

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