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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

Inactive Publication Date: 2005-08-04
AJINOMOTO CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to produce a wood-polymer composite with well-balanced mechanical strength and processability. The inventors found that adding a specific polyol ester compound to a composition for wood-polymer composites significantly improves impact strength and tensile strength, and the resulting composite has improved processability. The composition includes a thermoplastic resin, wood flour, and a polyol ester compound with at least one hydroxyl group esterified with fatty acid. The polyol ester compound can be a polyglycerol derivative or a dibasic acid ester of a polyol or polyol condensate. The resulting wood-polymer composite has good mechanical strength and can be made from various thermoplastic resins.

Problems solved by technology

Nevertheless, none of the proposed methods has succeeded in producing a wood-polymer composite showing well-balanced mechanical strength and processability as compared to products made from lumber alone and products made from thermoplastic resin alone.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The present invention provides a composition for wood-polymer composites containing a thermoplastic resin, wood flour and a polyol ester compound having not less than one hydroxyl group esterified with fatty acid, and a wood-polymer composite made from this composition. According to the present invention, a wood-polymer composite having well-balanced mechanical strength and processability, as compared to products made from lumber alone and products made from thermoplastic resin alone, and a composition for wood-polymer composites therefor can be provided.

Description

TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to a composition for wood-polymer composites, which composition containing a thermoplastic resin, wood flour and a specific polyol ester compound, and a wood-polymer composite having markedly improved mechanical strength and processability, which is made from this composition. BACKGROUND OF THE INVENTION [0002] Wood-polymer composites comprising a thermoplastic resin and wood flour have been conventionally known. Wood-polymer composites are thermoplastic as compared to products made from lumber alone, and advantageously processed into various shapes. Accordingly, they are widely used for house construction members, building materials and the like, besides lacquer wares, doors, frames and the like. A wood-polymer composite, when seen as a thermoplastic resin, is advantageous in that it affords woody texture, such as appearance (e.g., color tone, gloss etc.), a touch (e.g., thermal conduction, surface roughness) and...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L101/00C08L97/02
CPCC08L97/02C08L2666/18C08L2666/06C08L2666/20C08L2666/02
Inventor YASUDA, NAOKINEMOTO, HARUO
Owner AJINOMOTO CO INC
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