Special resin with high melt strength for foaming of polylactic acid and preparation method thereof

Abstract

The invention relates to special resin with high melt strength for foaming of polylactic acid and a preparation method thereof, and belongs to the technical field of macromolecules. The special resin is prepared from the following raw materials in parts by weight: 60 to 95 parts of polylactic acid, 1 to 20 parts of biodegradable copolymer, 0.1 to 1 part of chain expander, 1 to 5 parts of melt enhancer, 0.1 to 5 parts of nucleating agent, and 0.5 to 2 parts of lubricant. The special resin has the advantages and beneficial effects that by improving the melt strength of the polylactic acid and enhancing the adsorbing ability of polylactic acid on CO2 (carbon dioxide), the foaming property of the polylactic acid is enhanced. The used devices are universal devices in the technical field of macromolecules, such as a double-screw extruder, a crystallizing drier and a plastic extrusion foaming machine. The special resin has the advantages that the operation is simple and convenient, the control is easy, the industrialized implementing is easy, and the economic benefit is high.

Description

technical field

[0001] The invention belongs to the technical field of macromolecules, and in particular refers to a polylactic acid foamed resin and a preparation method thereof, which are applied to 2 It is the field of polylactic acid foam sheet processed by foaming agent and extrusion foaming. Background technique

[0002] Foam plastic has many excellent properties such as light weight, high impact strength, high specific strength, good heat and sound insulation, and has been widely used in packaging, construction, transportation and other departments. Traditional foam plastics such as polyethylene (PE), polypropylene (PP), polystyrene (PS), etc. are made of non-renewable petroleum resources. After use, they can hardly be decomposed in the natural environment. Contains a large amount of toxic substances such as nitrogen, sulfur, phosphorus, and halogen, which seriously pollutes the natural environment on which human beings depend.

[0003] The new environmentally frien...

Examples

Embodiment 1

[0034] Made from the following raw materials in parts by weight:

[0035] Polylactic acid: 60 parts,

[0036] Biodegradable copolymer: 1 part of polyadipate-terephthalate-butylene glycol ester,

[0037] Chain extender: 0.1 part of 1-4 butanediol,

[0038] Melt Enhancer: PARALOID from The Dow Chemical Company TM BPMS-250, 1 part,

[0039] Nucleating agent: 0.1 part of talcum powder,

[0040] Lubricant: 0.5 parts of PE wax;

[0041] Include the following steps:

[0042] (1) Mix polylactic acid, biodegradable copolymer, chain extender, melt enhancer, nucleating agent, and lubricant evenly; among them, polylactic acid and biodegradable copolymer need to be crystallized and dried before use, and their moisture The weight percentage is within 250ppm;

[0043] (2) The mixture prepared in step (1) is added to a twin-screw extruder, extruded and pelletized to obtain a polylactic acid modified resin, and after drying, a special resin for polylactic acid foaming is obtained;

[0...

Embodiment 2

[0048] Made from the following raw materials in parts by weight:

[0049] 80 parts of polylactic acid,

[0050] Biodegradable copolymer: 10 parts of polycaprolactone,

[0051] 0.5 part of chain extender 1-4 butane diisocyanate,

[0052] Melt Enhancer PARALOID from The Dow Chemical Company TM BPMS-255, 3 copies,

[0053] Nucleating agent: 2.5 parts of calcium carbonate,

[0054] Lubricant: 1.2 parts of calcium stearate.

[0055] The preparation method is the same as in Example 1.

Embodiment 3

[0057] Made from the following raw materials in parts by weight:

[0058] 95 parts of polylactic acid,

[0059] Biodegradable copolymer: polyethylene glycol 20 parts,

[0060] Chain extender: 1 part of toluene diisocyanate,

[0061] Melt Enhancer: PARALOID from The Dow Chemical Company TM BPMS-265, 5 copies,

[0062] Nucleating agent: 5 parts of titanium dioxide,

[0063] Lubricant: 2 parts of glyceryl monostearate stearic acid.

[0064] The preparation method is the same as in Example 1.

[0065] The effect of the present invention is further illustrated by the following experimental examples.

technical field

[0001] The invention belongs to the technical field of macromolecules, and in particular refers to a polylactic acid foamed resin and a preparation method thereof, which are applied to 2 It is the field of polylactic acid foam sheet processed by foaming agent and extrusion foaming. Background technique

[0002] Foam plastic has many excellent properties such as light weight, high impact strength, high specific strength, good heat and sound insulation, and has been widely used in packaging, construction, transportation and other departments. Traditional foam plastics such as polyethylene (PE), polypropylene (PP), polystyrene (PS), etc. are made of non-renewable petroleum resources. After use, they can hardly be decomposed in the natural environment. Contains a large amount of toxic substances such as nitrogen, sulfur, phosphorus, and halogen, which seriously pollutes the natural environment on which human beings depend.

[0003] The new environmentally frien...

Examples

Embodiment 1

[0034] Made from the following raw materials in parts by weight:

[0035] Polylactic acid: 60 parts,

[0036] Biodegradable copolymer: 1 part of polyadipate-terephthalate-butylene glycol ester,

[0037] Chain extender: 0.1 part of 1-4 butanediol,

[0038] Melt Enhancer: PARALOID from The Dow Chemical Company TM BPMS-250, 1 part,

[0039] Nucleating agent: 0.1 part of talcum powder,

[0040] Lubricant: 0.5 parts of PE wax;

[0041] Include the following steps:

[0042] (1) Mix polylactic acid, biodegradable copolymer, chain extender, melt enhancer, nucleating agent, and lubricant evenly; among them, polylactic acid and biodegradable copolymer need to be crystallized and dried before use, and their moisture The weight percentage is within 250ppm;

[0043] (2) The mixture prepared in step (1) is added to a twin-screw extruder, extruded and pelletized to obtain a polylactic acid modified resin, and after drying, a special resin for polylactic acid foaming is obtained;

[0...

Embodiment 2

[0048] Made from the following raw materials in parts by weight:

[0049] 80 parts of polylactic acid,

[0050] Biodegradable copolymer: 10 parts of polycaprolactone,

[0051] 0.5 part of chain extender 1-4 butane diisocyanate,

[0052] Melt Enhancer PARALOID from The Dow Chemical Company TM BPMS-255, 3 copies,

[0053] Nucleating agent: 2.5 parts of calcium carbonate,

[0054] Lubricant: 1.2 parts of calcium stearate.

[0055] The preparation method is the same as in Example 1.

Embodiment 3

[0057] Made from the following raw materials in parts by weight:

[0058] 95 parts of polylactic acid,

[0059] Biodegradable copolymer: polyethylene glycol 20 parts,

[0060] Chain extender: 1 part of toluene diisocyanate,

[0061] Melt Enhancer: PARALOID from The Dow Chemical Company TM BPMS-265, 5 copies,

[0062] Nucleating agent: 5 parts of titanium dioxide,

[0063] Lubricant: 2 parts of glyceryl monostearate stearic acid.

[0064] The preparation method is the same as in Example 1.

[0065] The effect of the present invention is further illustrated by the following experimental examples.

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