Effects of alkali pretreatment on sodium silicate bonding of rice hulls in particleboard

Date

3-1940

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Ernesto J Del Rosario

Abstract

REYES, VICENTE MESINA, College of Arts and Sciences, University of the Philippines at Los Banos, March, 1980. Effect of Alkali Pretreatment on Sodium Silicate Bonding of Rice Hulls in Particleboard.

Adviser: Dr. Ernesto J. del Rosario

Partially milled rice hulls of 3-4 mm. long particles were boiled with 1% sodium hydroxide solution for an hour and after cooling, the pH of the mixture was adjusted to the desired level. The particles were then pressed into composite boards at 140°C and 24.2 kg./cm.2 pressure for seven minutes, with consequent heating for another 10 minutes at zero pressure, using sodium silicate as binder and ZnO as hardener. The resulting composite boards at pH 9, with preset mean den-sity of 841 kg/m3, containing 10% sodium silicate and 1% ZnO, were found to have a static bending strength comparable to boards made from rice hulls and straws (1:1 by weight) which were subjected to the same conditions. The hot alkali pretreatment enhanced water absorption and thickness swelling of all boards. Acidification of particles did not quite impart water repellency on the particleboards, and instead swelling of two to three times the size of the dry board was noted. All boards failed the standards set by PHILSA on bending strength, water absorption, and thickness swelling.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1980 C4 R69

Document Type

Thesis

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