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Biodegradable protein/starch-based thermoplastic composition

A thermoplastic composition and protein technology, applied in the directions of protein food ingredients, protein food processing, baking mixtures, etc., can solve problems such as harmful soil ecological environment, and achieve the effect of improving soil

Inactive Publication Date: 2001-06-13
NATURAL POLYMER INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large amount of inorganic materials in land fills is harmful to soil ecology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The mechanical properties of low rate expansion foams prepared from protein / starch / native cellulose compositions were tested according to the American Standard Method for Testing Materials (ASTM). The tensile strength of foamed plastics was tested according to ASTM standard method D3574. The density of foamed plastics was tested according to ASTM standard method D1622. The compressive strength of foamed plastics was tested according to ASTM standard method D1621. The resilience of foamed plastics was tested according to ASTM standard method D3574. The mechanical properties of the low-magnification expansion foam of embodiment 1 protein / starch composition

[0055] Low-magnification expansion foams are prepared from protein / starch thermoplastic compositions as shown in Table 1 including soy protein isolates, or wheat gluten proteins including corn starch, tapioca starch (including hydroxypropylated tapioca Starch and cross-linked tapioca starch), hydroxypropylated high...

Embodiment 2

[0070] Low expansion expansion foams of protein / starch compositions containing variable amounts of natural cellulose fibers

[0071] The low-magnification expansion foam is composed of a protein / starch composition containing natural cellulose, which is composed of soybean protein isolates shown in Table 2, corn starch, 10-40% by weight based on the protein / starch composition Natural wood fiber, glycerin, water, foaming agent (BIF), nucleating agent (talc, calcium carbonate) and lubricant (lecithin). The components were premixed as in Example 1 above. Pellets of the components were processed by a Leistritz Micro-18 extruder. The temperature range is: Zone 1 / Zone 2 / Zone 3 / Zone 4 / Zone 5 / Zone 6=100 / 110 / 115 / 120 / 110 / 100°C, die head temperature is 92-100°C, screw speed is 60rpm, die Head pressure is 180-360psi. The moisture content of the particles was measured by a moisture content analyzer.

[0072] There was a Brabender Model PL2100 with a foam die head 1 mm to process the pel...

Embodiment 3

[0079] Low expansion expansion foams of protein / starch compositions containing various natural cellulose fibers

[0080] The low-magnification expansion foam is composed of soybean protein isolate, corn starch, glycerin, water, chemical foaming agent (BIF), nucleating agent (talcum powder, calcium carbonate), lubricant (lecithin) and each as shown in Table 3. It consists of a protein / starch composition formed from natural cellulose fibers (beet pulp, crushed cereal grass, shredded grass, wood fiber, glass fiber).

[0081] The components were premixed as in Example 1 above. The particle temperature range is: Zone 1 / Zone 2 / Zone 3 / Zone 4 / Zone 5 / Zone 6=100 / 110 / 115 / 120 / 110 / 95°C, the die head temperature is about 95°C, the screw speed is 60rpm, the die Head pressure is 400-600psi. The moisture content of the particles was measured by a moisture content analyzer. The water content is about 15.0-18.0% by weight. The pellets were processed into low rate expansion foams as described...

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PUM

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Abstract

The invention provides a biodegradable protein / starch-based thermoplastic composition. The composition is particularly useful in preparing low ratio expanded foams. Natural cellulosic fibers such as grass fiber, wood fiber, chopped straw, bagasse, etc. function as reinforcement filler. A metallic salt hydrate is added to improve mechanical properties of the protein / starch-based thermoplastic. The composition is processed by conventional methods, such as extrusion and injection molding, into packaging material or articles that are low density, high compressive strength, tensile strength, and good resilience.

Description

Background of the invention [0001] 1. field of invention [0002] The present invention relates to a biodegradable protein and starch based thermoplastic composition containing natural cellulose fibers. The composition can be made into biodegradable low-expansion foam plastics, and the foam plastics can be used as low-density foam packaging materials or food containers. [0003] 2. technical background [0004] There is a continuing need in the field of food packaging to provide disposable, fully biodegradable materials and articles that are not only inexpensive, environmentally friendly but also possess good mechanical properties. [0005] In recent years, people have become more and more aware of the environmental pollution caused by plastics. Efforts have been made to develop biodegradable plastics such as protein-based and starch-based plastics. These biodegradable thermoplastic compositions were developed in an attempt to replace non-degradable petroleum-based therm...

Claims

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Application Information

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IPC IPC(8): B65D1/00A23J3/26A23L1/00A23L1/0522A23L13/00A23L29/20A23L29/262A23P1/08A23P1/14C08L3/00C08L89/00
CPCA23L1/0522A23L1/0088C08L3/00C08L89/00A23P1/086A23L1/0067A23P1/144A23L1/0534A23J3/26A23P20/20A23P30/34A23L29/212A23L29/262B29B9/12B29B7/007B29B7/726B29B7/92B29B9/16C08L2666/02
Inventor 王树桓
Owner NATURAL POLYMER INT CORP
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