CN101230154A - A kind of konjac glucomannan/polyester composite material and preparation method thereof - Google Patents

Abstract

The invention relates to a konjac glucomannan/polyester composite material and a preparation method thereof, which belongs to the field of polymer material science and also belongs to the field of natural polymers. A konjac glucomannan/polyester composite material is characterized in that it is prepared from konjac glucomannan and polyester raw materials, and the percentage by weight of each raw material is: konjac glucomannan 1-65%, polyester Esters 35-99%. The polyester is polylactic acid, polycaprolactone or polyhydroxyalkyl ester. The invention utilizes biodegradable polyester and konjac glucomannan to melt and blend to prepare a composite material that is hydrophobic, thermoplastic and fully biodegradable; it has the characteristics of low cost, environmental protection and simple process.

Description

A kind of konjac glucomannan/polyester composite material and preparation method thereof

technical field

The invention relates to a konjac glucomannan/polyester composite material and a preparation method thereof, which belongs to the field of polymer material science and also belongs to the field of natural polymers.

Background technique

Due to the increasing consumption of petroleum resources and the environmental pollution caused by its manufactured products, the research on new materials based on renewable biomass resources has attracted increasing attention, among which natural polymers are an important type of biomass resources. New materials mainly refer to materials that meet the requirements of not only having good mechanical properties during use, meeting various needs, but also degrading into small molecular substances such as water and carbon dioxide after use. Degradable materials degrade through photodegradation, chemical degradation, biodegradation, etc., and usually contain hydrolyzable functional groups (such as ester bonds, urea bonds, amide bonds, ether bonds, etc.), including synthetic materials and natural materials. Synthetic degradation materials include polylactic acid, polycaprolactone, polyhydroxyalkyl ester, etc. Natural polysaccharides are important sugars that exist in nature, including cellulose, starch, etc. At present, the natural polysaccharide nano-whiskers and lamellae prepared by them have successfully enhanced modified rubber (Biomacromolecules 2006, 6, 612; Biomacromolecules 2003, 4, 1835; Macromolecules 2005, 38, 3783), starch plastics (Biomacromolecules 2006, 7, 531), polylactic acid plastic (Biomacromolecules 2005, 6, 3160), polycaprolactone (Macromolecules 2002, 35, 2190), polyvinyl alcohol (Polymer 2005, 46, 5637), polypropylene, polyvinyl chloride , soybean protein plastics, etc. It is particularly worth mentioning that starch nanoplatelets extracted from starch also show obvious strengthening effects when combined with starch plastics. As people continue to pay attention to their own health and the natural environment, the research, development and utilization of biomass materials and their derivatives and composite materials have attracted more and more attention.

Konjac is a characteristic resource of our country. Hubei is a large province of konjac planting, with many konjac planting bases and konjac powder processing enterprises. With the adoption of the United Nations Food Hygiene Organization's adoption of the free sale of konjac as a qualified food in the world, the US and European markets have successively opened up to it, and the international market for konjac products has continued to expand. Related basic and applied research has gradually attracted attention abroad in the past 10 years. . my country's konjac export is now limited to raw materials, the profit is meager, and the added value of the product is low. The main component of konjac powder is konjac glucomannan (KGM), which is a natural polysaccharide whose main chain is composed of glucose and mannose linked by β-1,4 pyranosidic bonds. So far, the research on KGM has mostly focused on the extraction, structural analysis and characterization of KGM, food properties (such as rheology, gelling, thickening, etc.), physicochemical properties, processing methods as food, medicinal and health care. Function, general physical or chemical modification, etc., the products developed are few and low-grade, and the application and transformation of research results are very limited. The in-depth development of KGM and the expansion of application fields still need a lot of work.

Contents of the invention

The object of the present invention is to provide a hydrophobic, thermoplastic and biodegradable konjac glucomannan/polyester composite material and a preparation method thereof.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows: a konjac glucomannan/polyester composite material is characterized in that it is prepared from konjac glucomannan and polyester raw materials, and the weight of each raw material is The percentages are: konjac glucomannan 1-65%, polyester 35-99%.

The polyester includes: polylactic acid, polycaprolactone or polyhydroxyalkyl ester.

The polylactic acid is poly D-lactic acid (PDLA), poly L-lactic acid (PLLA) or poly DL-lactic acid (PDLLA).

The polyhydroxyalkyl ester is polyhydroxybutyrate or polyhydroxyvalerate.

The preparation method of above-mentioned a kind of konjac glucomannan/polyester composite material is characterized in that it comprises the steps:

1). According to the percentage by weight of each raw material: konjac glucomannan 1-65%, polyester 35-99%, select konjac glucomannan and polyester for use; 2). Extrude with internal mixer or screw Konjac glucomannan and polyester are melted and blended out of the machine, and shaped to obtain konjac glucomannan/polyester composite material.

The temperature range of the melt blending is 60-200°C (the blending temperature is higher than the melting temperature of the polyester, which is different due to the type of polyester), the speed of the melt blending is 50-200rpm, and the time of the melt blending is 5-30min.

The molding is injection molding, extrusion or thermocompression molding. The temperature range of the hot pressing or injection molding is 60-200° C. (varies with the type of polyester), the pressure of hot pressing or injection molding is 20-80 MPa, and the time of hot pressing or injection molding is 5-20 minutes.

The invention utilizes biodegradable polyester and konjac glucomannan to melt and blend to prepare a hydrophobic, thermoplastic and fully biodegradable (biodegradable) composite material. The invention has the characteristics of low cost, environmental protection and simple process, and the prepared konjac glucomannan/polyester composite material has the characteristics of hydrophobicity, thermoplasticity and biodegradability.

Detailed ways

In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples.

Example 1:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 30%, polycaprolactone 70% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. Take the blend and put it on an experimental hot press (S-5001, Wuhan Tianmu Science and Technology Development Co., Ltd.) at 90°C and 20MPa, and hot press it for 5 minutes to prepare a sheet sample (a kind of konjac glucomannan/ polyester composite).

Example 2:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 10%, polycaprolactone 90% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. Take the blend and put it on an experimental hot press (S-5001, Wuhan Tianmu Science and Technology Development Co., Ltd.) at 90°C and 20MPa, and hot press it for 5 minutes to prepare a sheet sample (a kind of konjac glucomannan/ polyester composite).

Example 3:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 5%, polycaprolactone 95% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. Take the blend and put it on an experimental hot press (S-5001, Wuhan Tianmu Science and Technology Development Co., Ltd.) at 90°C and 20MPa, and hot press it for 5 minutes to prepare a sheet sample (a kind of konjac glucomannan/ polyester composite).

Example 4:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 20%, polycaprolactone 80% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after banburying at 80° C. and 100 rpm for 15 minutes, the blend was taken out. Take the blend and put it on an experimental hot press (S-5001, Wuhan Tianmu Science and Technology Development Co., Ltd.) at 80°C and 20MPa, and hot press it for 5 minutes to prepare a sheet sample (a kind of konjac glucomannan/ polyester composite).

Example 5:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 20%, polycaprolactone 80% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after banburying at 100° C. and 50 rpm for 15 minutes, the blend was taken out. The blend was taken on an experimental hot press (S-5001, Wuhan Tianmu Science and Technology Development Co., Ltd.) at 80°C and 20 MPa, and hot pressed for 5 minutes to prepare a sheet sample.

Embodiment 6:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polylactic acid {Shenzhen Guanghua Weiye Industrial Co., Ltd., poly L-lactic acid (PLLA)} and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan Add 40% sugar and 60% polylactic acid into a twin-screw extruder for mixing. The feed rate is 150g min ^-1 , the screw speed is 80rpm, the temperature range is 170-180°C, and the extrusion temperature is 180°C. get a blend. The blend was taken on an injection molding machine at 180° C. and 60 MPa, and injected for 10 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Embodiment 7:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polylactic acid {Shenzhen Guanghua Weiye Industrial Co., Ltd., poly L-lactic acid (PLLA)} and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan Add 20% sugar and 80% polylactic acid into a twin-screw extruder for mixing. The feed rate is 150g min ^-1 , the screw speed is 80rpm, the temperature range is 170-180°C, and the extrusion temperature is 180°C. get a blend. The blend was taken on an injection molding machine at 180° C. and 60 MPa, and injected for 10 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Embodiment 8:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polylactic acid {Shenzhen Guanghua Weiye Industrial Co., Ltd., poly L-lactic acid (PLLA)} and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan Add 10% sugar and 90% polylactic acid into a twin-screw extruder for mixing. The feed rate is 100g min ^-1 , the screw speed is 80rpm, the temperature range is 170-180°C, and the extrusion temperature is 180°C. get a blend. The blend was taken on an injection molding machine at 180° C. and 60 MPa, and injected for 10 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Embodiment 9:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polylactic acid {Shenzhen Guanghua Weiye Industrial Co., Ltd., poly L-lactic acid (PLLA)} and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan Add 10% sugar and 90% polylactic acid into a twin-screw extruder for mixing. The feed rate is 100g min ^-1 , the screw speed is 80rpm, the temperature range is 170-190°C, and the extrusion temperature is 190°C. get a blend. The blend was taken on an injection molding machine at 190° C. and 60 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 10:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polylactic acid {Shenzhen Guanghua Weiye Industrial Co., Ltd., poly L-lactic acid (PLLA)} and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 10% sugar and 90% polylactic acid are added to a twin-screw extruder for mixing, the feed rate is 100g min ^-1 , the screw speed is 80rpm, the temperature is 170°C, and the extrusion temperature is 170°C. thing. The blend was taken on an injection molding machine at 170° C. and 60 MPa, and injected for 15 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 11:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxybutyrate (Jiangsu Nantian Group Co., Ltd.) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 25%, polyhydroxy Add 75% butyrate into the extruder, mix and extrude. The feed rate is 80g min ^-1 , the screw speed is 60rpm, the temperature range is 170-190°C, and the extrusion temperature is 190°C, and the sheet is obtained by direct extrusion molding (a konjac glucomannan/polyester composite material) .

Example 12:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxybutyrate (Jiangsu Nantian Group Co., Ltd.) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 15%, polyhydroxy Add 85% butyrate into the extruder, mix and extrude. The feed rate is 80g min ^-1 , the screw speed is 60rpm, the temperature range is 170-190°C, and the extrusion temperature is 190°C, and the sheet is obtained by direct extrusion molding (a konjac glucomannan/polyester composite material) .

Example 13:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxybutyrate (Jiangsu Nantian Group Co., Ltd.) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 5%, polyhydroxy Add 95% butyrate into the extruder, mix and extrude. The feed rate is 80g min ^-1 , the screw speed is 60rpm, the temperature range is 170-190°C, and the extrusion temperature is 190°C, and the sheet is obtained by direct extrusion molding (a konjac glucomannan/polyester composite material) .

Example 14:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxybutyrate (Jiangsu Nantian Group Co., Ltd.) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 15%, polyhydroxy Add 85% butyrate into the extruder, mix and extrude. The feed rate was 80gmin ^-1 , the screw speed was 60rpm, the temperature range was 170-180°C, and the extrusion temperature was 180°C, and a sheet (a konjac glucomannan/polyester composite material) was obtained by direct extrusion molding.

Example 15:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxybutyrate (Jiangsu Nantian Group Co., Ltd.) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 15%, polyhydroxy Add 85% butyrate into the extruder, mix and extrude. The feed rate is 80g min ^-1 , the screw speed is 100rpm, the temperature range is 170-190°C, and the extrusion temperature is 190°C, and the sheet is obtained by direct extrusion molding (a konjac glucomannan/polyester composite material) .

Example 16:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 50%, polycaprolactone 50% , into SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 80° C. and 120 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 80° C. and 40 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 17:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 30%, polycaprolactone 70% , into SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 80° C. and 120 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 80° C. and 40 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 18:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 10%, polycaprolactone 90% , into SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 80° C. and 120 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 80° C. and 40 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 19:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 10%, polycaprolactone 90% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 90° C. and 40 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 20:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 25%, polycaprolactone 75% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 90° C. and 40 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 21:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 25%, polycaprolactone 75% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 90° C. and 80 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 22:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polycaprolactone (Germany, BASF) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 25%, polycaprolactone 75% , into the SU-70 internal mixer (Changzhou Suyan Technology Co., Ltd.), and after internal mixing at 90° C. and 80 rpm for 10 minutes, the blend was taken out. The blend was taken on an injection molding machine at 90° C. and 20 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 23:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxyvalerate and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) according to the percentage by weight of each raw material: konjac glucomannan 1%, polyhydroxyvalerate 99%, adding SU -70 internal mixer (Changzhou Suyan Technology Co., Ltd.), after internal mixing at 200° C. and 50 rpm for 5 minutes, the blend was taken out. The blend was taken on an injection molding machine at 200° C. and 20 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 24:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Polyhydroxyvalerate and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) according to the percentage by weight of each raw material: konjac glucomannan 65%, polyhydroxyvalerate 35%, adding SU -70 internal mixer (Changzhou Suyan Technology Co., Ltd.), after internal mixing at 200° C. and 200 rpm for 30 minutes, the blend was taken out. The blend was taken on an injection molding machine at 200° C. and 40 MPa, and injected for 5 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 25:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Poly D-lactic acid (PDLA) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: konjac glucomannan 40%, polylactic acid 60%, add twin-screw Mixing was carried out in an extruder, the feed rate was 150 g min ⁻¹ , the screw speed was 80 rpm, the temperature range was 170-180° C., the extrusion temperature was 180° C., and the blend was granulated. The blend was taken on an injection molding machine at 180° C. and 60 MPa, and injected for 10 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Example 26:

A kind of preparation method of konjac glucomannan/polyester composite material, it comprises the steps:

Poly DL-lactic acid (PDLLA) and konjac glucomannan powder (Wuhan Johnson Konjac Products Co., Ltd.) are according to the percentage by weight of each raw material: 20% of konjac glucomannan, 80% of polylactic acid, add twin-screw Mixing was carried out in an extruder, the feed rate was 150 g min ⁻¹ , the screw speed was 80 rpm, the temperature range was 170-180° C., the extrusion temperature was 180° C., and the blend was granulated. The blend was taken on an injection molding machine at 180° C. and 60 MPa, and injected for 10 minutes to obtain a sheet sample (a konjac glucomannan/polyester composite material).

Claims (8)

1. A konjac glucomannan/polyester composite material is characterized in that it is prepared from konjac glucomannan and polyester raw materials, and the percentage by weight of each raw material is: konjac glucomannan 1-65% , Polyester 35-99%. 2. a kind of konjac glucomannan/polyester composite material according to claim 1, is characterized in that: described polyester is polylactic acid, polycaprolactone or polyhydroxyalkyl ester. 3. A kind of konjac glucomannan/polyester composite material according to claim 2, characterized in that: said polylactic acid is poly D-lactic acid, poly L-lactic acid or poly DL-lactic acid. 4. A kind of konjac glucomannan/polyester composite material according to claim 2, characterized in that: the polyhydroxyalkyl ester is polyhydroxybutyrate or polyhydroxyvalerate. 5. the preparation method of a kind of konjac glucomannan/polyester composite material as claimed in claim 1, is characterized in that it comprises the steps: 1). According to the percentage by weight of each raw material: konjac glucomannan 1-65%, polyester 35-99%, select konjac glucomannan and polyester for use; 2). Extrude with internal mixer or screw Konjac glucomannan and polyester are melted and blended out of the machine, and shaped to obtain konjac glucomannan/polyester composite material. 6. the preparation method of a kind of konjac glucomannan/polyester composite material according to claim 5, is characterized in that: the temperature range of described melt blending is 60-200 ℃, and the rotating speed of melt blending is 50 -200rpm, the time of melt blending is 5-30min. 7. The preparation method of a kind of konjac glucomannan/polyester composite material according to claim 5, characterized in that: said molding is injection molding, extrusion or thermocompression molding. 8. the preparation method of a kind of konjac glucomannan/polyester composite material according to claim 7, is characterized in that: the temperature range of described hot pressing or injection molding is 60-200 ℃, hot pressing or injection molding The pressure is 20-80MPa, and the time for hot pressing or injection molding is 5-20min.