Full biodegradation plastic for starch ester and preparation method

Abstract

A starch ester completely biodegradable plastic and a preparation method thereof. It is characterized in that it is a fully esterified starch ester biodegradable plastic, and its raw materials are composed of 85-95 parts by weight of starch, 3-5 parts of flexible agent, 2-3 parts of esterifying agent, and 0.1 parts of crosslinking agent. -0.3 parts, 0.05-0.1 parts of hydrolase, 200 parts of water. The present invention uses hydrolysis, high-pressure esterification, and polycondensation to completely esterify starch to obtain long-chain starch ester colloids, and further obtain complete biodegradation of starch esters by shearing, mixing, cross-linking, and devolatilization in a screw extruder. Plastics have realized the complete use of starch to prepare biodegradable plastics.

Description

technical field

[0001] The invention relates to the field of biodegradable plastics. Specifically relates to a starch ester complete biodegradable plastic prepared by complete esterification treatment. The material has the characteristics of plastic and complete degradation function, and realizes the preparation of bioplastics by completely utilizing starch. The source of raw materials is sufficient, the quality is stable, and the process control is simple. It can replace the existing biodegradable plastics fermented by microorganisms and chemically synthesized to get rid of bioplastics. Dependence on petroleum resources and chemical raw materials. Background technique

[0002] Biodegradable plastic is a new energy-saving and environmentally friendly material. Because it contains active groups such as hydroxyl, ester, and carboxyl that are easily decomposed by microorganisms, when placed in a natural environment under certain temperature and humidity conditions, due to th...

Examples

Embodiment 1

[0033] 85 parts of tapioca starch, 5 parts of monopropyl maleate, 2 parts of succinic acid, 0.1 part of sodium tripolyphosphate, 0.05 part of lipase, and 200 parts of water were weighed for later use.

[0034] 1) Mix starch, water and lipase, raise the temperature in the reactor to 80°C, and stir at a constant speed for hydrolysis reaction for 30 minutes.

[0035] 2) The esterification agent succinic acid was added to the reaction kettle, the pressure of the reaction kettle was raised to 1.6Mpa, the temperature was raised to 120°C, and the esterification reaction was carried out under nitrogen protection for 30 minutes to obtain a liquid waxy starch ester.

[0036] 3) Add monopropyl maleate to the reaction kettle, the pressure of the reaction kettle rises to 1.6Mpa, the temperature rises to 120°C, and the polycondensation reaction occurs under nitrogen protection conditions to gradually form colloids. The reaction time is about 20 minutes, and the reaction is complete Finally,...

Embodiment 2

[0041] 90 parts of potato starch, 5 parts of ethyl dilactate, 2 parts of formic acid, 0.2 part of calcium maleate, 0.1 part of high-temperature α-amylase, and 200 parts of water were weighed for later use.

[0042] 1) Mix starch, water, and high-temperature α-starch in a reaction kettle at a temperature of 80°C, and stir at a constant speed for a hydrolysis reaction for 30 minutes.

[0043] 2) Formic acid was added to the reaction kettle, the pressure of the reaction kettle was raised to 2.0Mpa, the temperature was raised to 120°C, and the esterification reaction was carried out under nitrogen protection for 30 minutes to obtain a liquid waxy starch ester.

[0044] 3) Add ethyl dilactate into the reaction kettle, the pressure of the reaction kettle rises to 2.0Mpa, the temperature rises to 120°C, and the polycondensation reaction occurs under nitrogen protection conditions to gradually form colloids. The reaction time is about 20 minutes. After the reaction is complete, Add ca...

Embodiment 3

[0050] 95 parts of corn starch, 4 parts of hydroxybutyraldehyde, 3 parts of acetic anhydride, 0.2 part of epichlorohydrin, 0.1 part of high-temperature α-amylase, and 200 parts of water were weighed for later use.

[0051] 1) Combine starch, water, and high-temperature α-starch in a reaction kettle at a temperature of 80°C, and stir at a constant speed for a hydrolysis reaction for 40 minutes.

[0052] 2) Add acetic anhydride to the reactor, the pressure of the reactor is raised to 2.0Mpa, the temperature is raised to 120°C, and the esterification reaction is carried out under nitrogen protection for 30 minutes to obtain a liquid waxy starch ester.

[0053] 3) Add hydroxybutyraldehyde to the reaction kettle, the pressure of the reaction kettle rises to 2.0Mpa, and the temperature rises to 120°C. Under the condition of nitrogen protection, the polycondensation reaction gradually forms colloids. The reaction time is about 20 minutes. After the reaction is complete, add The epich...

technical field

[0001] The invention relates to the field of biodegradable plastics. Specifically relates to a starch ester complete biodegradable plastic prepared by complete esterification treatment. The material has the characteristics of plastic and complete degradation function, and realizes the preparation of bioplastics by completely utilizing starch. The source of raw materials is sufficient, the quality is stable, and the process control is simple. It can replace the existing biodegradable plastics fermented by microorganisms and chemically synthesized to get rid of bioplastics. Dependence on petroleum resources and chemical raw materials. Background technique

[0002] Biodegradable plastic is a new energy-saving and environmentally friendly material. Because it contains active groups such as hydroxyl, ester, and carboxyl that are easily decomposed by microorganisms, when placed in a natural environment under certain temperature and humidity conditions, due to th...

Examples

Embodiment 1

[0033] 85 parts of tapioca starch, 5 parts of monopropyl maleate, 2 parts of succinic acid, 0.1 part of sodium tripolyphosphate, 0.05 part of lipase, and 200 parts of water were weighed for later use.

[0034] 1) Mix starch, water and lipase, raise the temperature in the reactor to 80°C, and stir at a constant speed for hydrolysis reaction for 30 minutes.

[0035] 2) The esterification agent succinic acid was added to the reaction kettle, the pressure of the reaction kettle was raised to 1.6Mpa, the temperature was raised to 120°C, and the esterification reaction was carried out under nitrogen protection for 30 minutes to obtain a liquid waxy starch ester.

[0036] 3) Add monopropyl maleate to the reaction kettle, the pressure of the reaction kettle rises to 1.6Mpa, the temperature rises to 120°C, and the polycondensation reaction occurs under nitrogen protection conditions to gradually form colloids. The reaction time is about 20 minutes, and the reaction is complete Finally,...

Embodiment 2

[0041] 90 parts of potato starch, 5 parts of ethyl dilactate, 2 parts of formic acid, 0.2 part of calcium maleate, 0.1 part of high-temperature α-amylase, and 200 parts of water were weighed for later use.

[0042] 1) Mix starch, water, and high-temperature α-starch in a reaction kettle at a temperature of 80°C, and stir at a constant speed for a hydrolysis reaction for 30 minutes.

[0043] 2) Formic acid was added to the reaction kettle, the pressure of the reaction kettle was raised to 2.0Mpa, the temperature was raised to 120°C, and the esterification reaction was carried out under nitrogen protection for 30 minutes to obtain a liquid waxy starch ester.

[0044] 3) Add ethyl dilactate into the reaction kettle, the pressure of the reaction kettle rises to 2.0Mpa, the temperature rises to 120°C, and the polycondensation reaction occurs under nitrogen protection conditions to gradually form colloids. The reaction time is about 20 minutes. After the reaction is complete, Add ca...

Embodiment 3

[0050] 95 parts of corn starch, 4 parts of hydroxybutyraldehyde, 3 parts of acetic anhydride, 0.2 part of epichlorohydrin, 0.1 part of high-temperature α-amylase, and 200 parts of water were weighed for later use.

[0051] 1) Combine starch, water, and high-temperature α-starch in a reaction kettle at a temperature of 80°C, and stir at a constant speed for a hydrolysis reaction for 40 minutes.

[0052] 2) Add acetic anhydride to the reactor, the pressure of the reactor is raised to 2.0Mpa, the temperature is raised to 120°C, and the esterification reaction is carried out under nitrogen protection for 30 minutes to obtain a liquid waxy starch ester.

[0053] 3) Add hydroxybutyraldehyde to the reaction kettle, the pressure of the reaction kettle rises to 2.0Mpa, and the temperature rises to 120°C. Under the condition of nitrogen protection, the polycondensation reaction gradually forms colloids. The reaction time is about 20 minutes. After the reaction is complete, add The epich...