Composition for wood-polymer composite and wood-polymer composite made from the composition
a technology of composition and composite, which is applied in the field of composition of wood-polymer composites, can solve the problems that none of the proposed methods has succeeded in producing a wood-polymer composite showing and achieves the effect of well-balanced mechanical strength and processability
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example 1
(1) Preparation of Polyglycerol Derivative PG-1
[0040] Into a reaction flask equipped with a thermometer, a mixer, a nitrogen inlet and a reflux tube were charged 50.0 parts by weight of stearic acid (NAA180, manufactured by NOF Corporation), 87.88 parts by weight of polyglycerol (polyglycerol #500, manufactured by Sakamoto Yakuhin Kogyo Co., Ltd., degree of condensation: 6.7, number of hydroxyl groups: 8.7), and 0.01 part by weight of tetrabutyl titanate (manufactured by Junsei Chemical Co., Ltd., reagent special grade) and the temperature was raised to 160° C. over 4 hr under a nitrogen stream. The mixture was heated at 160° C. for 2 hr and heated until the reaction mixture had an acid value of about 1 (mg KOH / g). The mixture was cooled to room temperature to give a reaction mixture of a polyglycerol derivative.
[0041] Hereinafter, the obtained polyglycerol derivative is referred to as polyglycerol derivative PG-1. The polyglycerol derivative PG-1 had an acid value of 0.5 and the...
example 2
(1) Preparation of Polyglycerol Derivative PG-2
[0044] In the same manner as in Example 1(1) except that the polyglycerol was charged in an amount of 29.5 parts by weight, a reaction mixture of polyglycerol derivative was prepared.
[0045] Hereinafter, the obtained polyglycerol derivative is referred to as polyglycerol derivative PG-2. The polyglycerol derivative PG-2 had an acid value of 0.8 and the degree of esterification as calculated from the weight ratio of the starting materials of 35%.
(2) Production of Composition for Wood-Polymer Composites
[0046] Polyglycerol derivative PG-2 obtained in the above-mentioned (1), wood flour (derived from hemlock, Cellulosin #100 manufactured by Kajino Seizo Co., Inc., 100 mesh pass), and an ethylene-propylene copolymer (BC-1B manufactured by Japan Polychem Corporation) preliminarily dried at 110° C. for 5 hr were mixed at the following compounding ratio in a henschel mixer (1720 rpm, 5 min), admixed in a single screw kneader and pelletized...
example 3
[0048] In the same manner as in Example 2 except that the compounded amount of the ethylene-propylene copolymer was 74.0 parts by weight and the compounded amount of the polyglycerol derivative PG-2 was 1.0 part by weight, pellets of a composition for wood-polymer composites were obtained.
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