Resin composition and its forming product

Abstract

The present invention provides a resin composition comprising polylactic acid and aliphatic polyester carbonate, which has practically adequate heat-resistance temperature, moldability, thermostability, solvent resistance and high mechanical strength, as well as a molded article thereof. In the resin composition, the Vicat softening point is 60 DEG C. or more, the tensile modulus of elasticity is 0.9 GPa or more, the modulus in flexure is 0.6 GPa or more, and the mixing ratio of polylactic acid (A) and aliphatic polyester carbonate (B), in terms of the ratio of (A) / (B) by weight, is 95 / 5 to 5 / 95. Further, the present invention provides a biodegradable injection-molded article having improvements in mechanical characteristics and impact resistance and superior disposal properties, particularly having strength enough to make it usable as a headgear material for use in helmets. The biodegradable injection-molded article is excellent in impact resistance, comprising mainly polylactic acid (A) and aliphatic polyester (E) and / or aliphatic polyester carbonate (B). This injection-molded article has a flexural strength of 30 MPa or more and an Izod impact strength of 3 kJ / m2 or more, and it is used as helmet headgear.

Description

technical field

[0001] The present invention relates to a resin composition mainly composed of polylactic acid and aliphatic polyester carbonate and its molded article.

[0002] The resin composition mainly composed of polylactic acid and aliphatic polyester carbonate of the present invention has excellent fluidity and formability, and is suitable for obtaining injection molded products, extrusion molded products, vacuum hollow molded products, blow molded products, fiber , multifilament, monofilament, rope, net, fabric, braid, non-woven fabric, film, sheet, laminate, container, foam and various parts and other molded products. The obtained molded product has sufficient mechanical strength and heat resistance, and is easily degraded by microorganisms in soil, activated sludge, and warm fertilizer. Therefore, it can be widely used in packaging materials, agriculture, fishery, food fields, and other applications where recycling is difficult.

[0003] For example, in the field ...

Examples

Embodiment 1

[0067] Example 1. Production of polylactic acid

[0068] L-lactide (manufactured by Shimadzu Corporation) and tin octoate as a ring-opening polymerization catalyst of 0.001 wt% to L-lactide were put into the reactor, and the average residence time in the reactor was 18 hours at a reaction temperature of 180°C. A continuous polymerization reaction is carried out. And it is introduced into the twin-screw extruder from the outlet of the reactor, and kneaded at a temperature of 180 ° C, a pressure of 5 mmHg, and an average residence time of 10 minutes, while removing unreacted lactide. Polylactic acid polymer (A-1).

Embodiment 2

[0070] 18,740 g (158.7 moles) of succinic acid, 21,430 g (237.8 moles) of 1,4-butanediol, 745 mg of zirconium acetylacetonate, and Zinc acetate 1.40g was reacted at 150-220°C for 2 hours under a nitrogen atmosphere, and water was fractionally distilled off. Then, it was aged for 3 hours under a vacuum degree of 150-80mmHg, and dehydration reaction was carried out, and then the vacuum degree was gradually increased so that the final vacuum degree was below 2mmHg, and water and 1,4-butanediol were further fractionated, and the total amount of fractionation reached 10,460 g to stop the reaction. The obtained oligomer (B-1) had a number average molecular weight of 1,780, a terminal hydroxyl group value of 102 KOHmg / g, and an acid value of 0.51 KOHmg / g.

[0071] Then, 24,000 g of the obtained oligomer (B-1) was placed in a 50-liter reaction vessel equipped with a stirrer, a fractional condenser, a thermometer, and a gas introduction tube, and 4,680 g of diphenyl carbonate was adde...

Embodiment 3

[0073] Dry the particles of the polylactic acid (A-1) obtained in Example 1 and the aliphatic polyester carbonate (B-2) obtained in Example 2 at 90° C. by a vacuum dryer for 10 hours, and in a V-type mixer A- The mixing ratio of 1 and B-2 is 10 / 90 by weight to mix, and supply twin-screw extruder (screw diameter 25mm, L / D=30) monofilament continuously, obtains pelletized resin mixture (C- 1).

[0074] After drying the pellets of C-1 at a temperature of 90° C. for 5 hours or more, they were supplied to an injection molding machine (molding pressure: 100 tons) to mold test pieces for physical property tests. As a result of evaluation of the obtained test piece, the Vicat softening point was 83° C., the tensile strength modulus was 1 GPa, and the flexural modulus was 0.8 GPa. The results are shown in Table 1.

technical field

[0001] The present invention relates to a resin composition mainly composed of polylactic acid and aliphatic polyester carbonate and its molded article.

[0002] The resin composition mainly composed of polylactic acid and aliphatic polyester carbonate of the present invention has excellent fluidity and formability, and is suitable for obtaining injection molded products, extrusion molded products, vacuum hollow molded products, blow molded products, fiber , multifilament, monofilament, rope, net, fabric, braid, non-woven fabric, film, sheet, laminate, container, foam and various parts and other molded products. The obtained molded product has sufficient mechanical strength and heat resistance, and is easily degraded by microorganisms in soil, activated sludge, and warm fertilizer. Therefore, it can be widely used in packaging materials, agriculture, fishery, food fields, and other applications where recycling is difficult.

[0003] For example, in the field ...

Examples

Embodiment 1

[0067] Example 1. Production of polylactic acid

[0068] L-lactide (manufactured by Shimadzu Corporation) and tin octoate as a ring-opening polymerization catalyst of 0.001 wt% to L-lactide were put into the reactor, and the average residence time in the reactor was 18 hours at a reaction temperature of 180°C. A continuous polymerization reaction is carried out. And it is introduced into the twin-screw extruder from the outlet of the reactor, and kneaded at a temperature of 180 ° C, a pressure of 5 mmHg, and an average residence time of 10 minutes, while removing unreacted lactide. Polylactic acid polymer (A-1).

Embodiment 2

[0070] 18,740 g (158.7 moles) of succinic acid, 21,430 g (237.8 moles) of 1,4-butanediol, 745 mg of zirconium acetylacetonate, and Zinc acetate 1.40g was reacted at 150-220°C for 2 hours under a nitrogen atmosphere, and water was fractionally distilled off. Then, it was aged for 3 hours under a vacuum degree of 150-80mmHg, and dehydration reaction was carried out, and then the vacuum degree was gradually increased so that the final vacuum degree was below 2mmHg, and water and 1,4-butanediol were further fractionated, and the total amount of fractionation reached 10,460 g to stop the reaction. The obtained oligomer (B-1) had a number average molecular weight of 1,780, a terminal hydroxyl group value of 102 KOHmg / g, and an acid value of 0.51 KOHmg / g.

[0071] Then, 24,000 g of the obtained oligomer (B-1) was placed in a 50-liter reaction vessel equipped with a stirrer, a fractional condenser, a thermometer, and a gas introduction tube, and 4,680 g of diphenyl carbonate was adde...

Embodiment 3

[0073] Dry the particles of the polylactic acid (A-1) obtained in Example 1 and the aliphatic polyester carbonate (B-2) obtained in Example 2 at 90° C. by a vacuum dryer for 10 hours, and in a V-type mixer A- The mixing ratio of 1 and B-2 is 10 / 90 by weight to mix, and supply twin-screw extruder (screw diameter 25mm, L / D=30) monofilament continuously, obtains pelletized resin mixture (C- 1).

[0074] After drying the pellets of C-1 at a temperature of 90° C. for 5 hours or more, they were supplied to an injection molding machine (molding pressure: 100 tons) to mold test pieces for physical property tests. As a result of evaluation of the obtained test piece, the Vicat softening point was 83° C., the tensile strength modulus was 1 GPa, and the flexural modulus was 0.8 GPa. The results are shown in Table 1.