CN108676200A - Biodegradable plastic base material and preparation method thereof - Google Patents
Biodegradable plastic base material and preparation method thereof Download PDFInfo
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- CN108676200A CN108676200A CN201810578164.0A CN201810578164A CN108676200A CN 108676200 A CN108676200 A CN 108676200A CN 201810578164 A CN201810578164 A CN 201810578164A CN 108676200 A CN108676200 A CN 108676200A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
- C08L3/02—Starch; Degradation products thereof, e.g. dextrin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The present invention relates to a kind of biodegradable plastic base material and preparation method thereof, which includes the following raw material：Starch, poly (propylene carbonate), polyhydroxybutyrate valeric acid copolyesters, magnesium stearate, epoxidized soybean oil, glycerine, hexamethylene diisocyanate, 2 phenyl, 2 oxazoline, lubricant, styrene butadiene styrene block copolymer, 1, 3 dimethyl, 6 semicarbazides pyrimidine, N, N ' two (2, 6 diisopropyl phenyls) carbodiimide, distearyl pentaerythritol diphosphite, cerium stearate, phenyl bis- (2, 4, 6 trimethylbenzoyls) phosphine oxide, potassium chloride, lauric acid diethyl amide borate, the masterbatch is a kind of biodegradable plastic, product is after using discarding made of masterbatch using the present invention, it can absolutely be degraded rapidly by the enzyme of microorganism secretion in a short time, it is completely converted into water and carbon dioxide, " white pollution " is eliminated to really realize.
Description
Technical field
The present invention relates to a kind of biodegradable plastic base materials and preparation method thereof.
Background technology
Plastics since the advent of the world has more than 100 years developing history, superior with high intensity, lightweight, corrosion-resistant etc.
Performance, so plastic products have become the substitute of metal, cement, ceramics, timber etc. in many occasions.It is various in recent years
Synthesis polymer plastic material products bring many convenience to our life, but increasing rapidly with plastics yield is pressed
Volume calculates plastic products and has leapt to the first in the world, and discarded plastics, i.e. white pollution bring great harm to environment；
Meanwhile the threat of increasingly depleted is faced with for synthesizing the petroleum resources of high molecular material.
In order to which controlling"white pollution" is endangered caused by environment, many countries have put into a large amount of man power and material and have endeavoured
It in the burning disposal of " white pollution ", landfill and recycling, but burns waste plastic and will produce pernicious gas, these have
Evil gas can cause secondary pollution；Landfill waste plastic can not only influence the gas permeability of soil, can also hinder water flow and work
The growth and development of object root system, and degradation speed is extremely slow；Recycling is only suitable for the few special modeling of those higher prices, yield
Material.Therefore, it is a huge engineering to administer " white pollution ", and for being difficult to recycle, quantity is big, widespread plastic products are adopted
It is manufactured with degradation plastic, it is made to be easy to be digested in the natural environment, be the important measures for eliminating " white pollution ", exploitation
Degradation plastic has become one of the research hotspot in Polymeric Industry field.
Invention content
The purpose of the present invention is to provide a kind of biodegradable plastic base materials with good mechanical properties and degradation property
And preparation method thereof.
The purpose of the present invention is achieved through the following technical solutions：A kind of biodegradable plastic base material, it includes by weight
The following raw material of the number than calculating：55-60 parts of starch, 25-30 parts of poly (propylene carbonate), 5-6 parts of polyhydroxybutyrate valeric acid copolyesters,
5-7 parts of magnesium stearate, 3-5 parts of epoxidized soybean oil, 2-5 parts of glycerine, 5-8 parts of hexamethylene diisocyanate, 2- phenyl -2- oxazoles
1-2 parts of quinoline, 1-3 parts of lubricant, 3-5 parts of Styrene-Butadiene-Styrene Block Copolymer, 1,3- dimethyl -6- semicarbazides are phonetic
2-3 parts of pyridine, N, 3-5 parts of N '-two (2,6- diisopropyl phenyl) carbodiimide, distearyl pentaerythritol diphosphite 1-
3 parts, 2-5 parts of cerium stearate, bis- 0.2-0.3 parts of (2,4,6- trimethylbenzoyls) phosphine oxides of phenyl, 5-7 parts of potassium chloride, the moon
5-8 parts of cinnamic acid diglycollic amide borate.
The preparation method of the biodegradable plastic base material, it is comprised the following steps that：
(1) after starch being uniformly mixed and dried with magnesium stearate, it is milled into the miniaturization that starch granules grain size is 2-5 μm
Starch；
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
After base -2- oxazoline immixtures, auxiliary material mixture A is obtained；
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is stirred mixing, obtains auxiliary material mixture B；
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), lubricant, styrene-
Butadiene-styrene block copolymer (SBS) and poly (propylene carbonate) are stirred mixing, obtain just mixed object；
(5) by the first mixed object obtained by step (4), the auxiliary material mixture B and lauric acid diethyl amide obtained by step (3)
Borate is stirred mixing, obtains blend；
(6) by obtained by step (5) blend move into double screw extruder in, carry out extruding pelletization, postcooling to get
The biodegradable plastic base material.
For the prior art, the advantage of the invention is that：
1. auxiliary material mixture A produced by the present invention can with Styrene-Butadiene-Styrene Block Copolymer collective effect
The compatibility of starch and poly (propylene carbonate) is substantially improved, the present invention carries out miniaturization after mixing starch with magnesium stearate in addition
Very fine starch, the very fine starch in other raw materials have fabulous dispersibility and solubility, very fine starch with it is auxiliary
Expect mixture A, Styrene-Butadiene-Styrene Block Copolymer, poly (propylene carbonate), auxiliary material mixture B and lauric acid two
Glycollic amide borate interaction masterbatch obtained has good mechanical property.
2. auxiliary material mixture B produced by the present invention can make the masterbatch of the present invention have good biodegradable performance.
Using product made of masterbatch of the present invention after using discarding, it can be dropped rapidly by the enzyme of microorganism secretion in a short time
Solution eliminates " white pollution " to really realize.
3. the primary raw material of the masterbatch is starch, and starch is cheap, is that the synthesis cost of the masterbatch is low；Again because forming sediment
Powder is fast-growing, renewable resource, resourceful, so preparing the masterbatch has significant economic benefit and ecological benefits.
Specific implementation mode
The content of present invention is described in detail with reference to embodiment：
A kind of biodegradable plastic base material, it includes the following raw material calculated by ratio of weight and the number of copies：55-60 parts of starch gathers
It is 25-30 parts of propylene carbonate, 5-6 parts of polyhydroxybutyrate valeric acid copolyesters, 5-7 parts of magnesium stearate, 3-5 parts of epoxidized soybean oil, sweet
2-5 parts oily, 5-8 parts of hexamethylene diisocyanate, 1-2 parts of 2- phenyl -2- oxazolines, 1-3 parts of lubricant, styrene-fourth two
Alkene -3-5 parts of styrene block copolymer, 2-3 parts of 1,3- dimethyl -6- semicarbazides pyrimidines, N, (2, the 6- diisopropyl benzenes of N '-two
Base) 3-5 parts of carbodiimide, 1-3 parts of distearyl pentaerythritol diphosphite, 2-5 parts of cerium stearate, phenyl it is bis- (2,4,
6- trimethylbenzoyls) 0.2-0.3 parts of phosphine oxide, 5-7 parts of potassium chloride, 5-8 parts of lauric acid diethyl amide borate.
Wherein, the starch be wheaten starch, cornstarch, tapioca, one or both of potato starch with
On mixture, preferably tapioca.
The lubricant is one or more of stearic acid, butyl stearate, oleamide, ethylene bis stearamide
Mixture, preferably ethylene bis stearamide.
The biodegradable plastic, it preferably includes the following raw material calculated by ratio of weight and the number of copies：58 parts of starch, poly- carbon
Sour 27 parts of the propyl ester in Asia, 5.5 parts of polyhydroxybutyrate valeric acid copolyesters, 6 parts of magnesium stearate, 4 parts of epoxidized soybean oil, 3 parts of glycerine, six Asias
6 parts of methyl diisocyanate, 1.5 parts of 2- phenyl -2- oxazolines, 2 parts of lubricant, s-B-S block copolymerization
4 parts of object, 2.5 parts of 1,3- dimethyl -6- semicarbazides pyrimidine, N, 4 parts of N '-two (2,6- diisopropyl phenyl) carbodiimide, double ten
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of eight 2 parts of alkyl pentaerythritol bis-phosphites, 4 parts of cerium stearate, phenyl
0.25 part, 6 parts of potassium chloride, 6 parts of lauric acid diethyl amide borate.
The preparation method of the biodegradable plastic base material, it is comprised the following steps that：
(1) after starch being uniformly mixed and dried with magnesium stearate, it is milled into the miniaturization that starch granules grain size is 2-5 μm
Starch；
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
After base -2- oxazoline immixtures, auxiliary material mixture A is obtained；
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is stirred mixing, obtains auxiliary material mixture B；
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), lubricant, styrene-
Butadiene-styrene block copolymer and poly (propylene carbonate) are stirred mixing, obtain just mixed object；
(5) by the first mixed object obtained by step (4), the auxiliary material mixture B and lauric acid diethyl amide obtained by step (3)
Borate is stirred mixing, obtains blend；
(6) by obtained by step (5) blend move into double screw extruder in, carry out extruding pelletization, postcooling to get
The biodegradable plastic base material；
Wherein, the concrete operation method of step (1) is：
A. after mixing by starch and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；By starch
The volume ratio of mixture and ball-milling medium is 1:The ratio of 2-3 measures ball-milling medium, then by starch mixture and ball-milling medium
It pours into ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:The ratio of 1-1.2 measures absolute ethyl alcohol
And pour into ball grinder, ball grinder is sealed；Wherein, the ball-milling medium is diameter Ceramic Balls or agate within the scope of 10-12mm
Nao balls；
B. ball grinder is placed in the ball milling rack that rotating speed is 250-300rpm and carries out ball milling, after ball milling 90-100h, stopped
Only ball milling obtains starch milk；Wherein, it in mechanical milling process, shuts down observation once at interval of 15-20h, and add absolute ethyl alcohol, mends
The volume ratio for the absolute ethyl alcohol being added before ball milling in the absolute ethyl alcohol and ball grinder that add is 1:20-25；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by nothing
After water-ethanol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 50-60 DEG C, it is ground later, crosses 200 mesh sieve, obtain micro-
Refine starch；
The very fine starch is compared with initial starch, and the strand and molecular weight distribution of starch are changed, portion
Long-chain and branched structure is divided to be broken, chain content of starch increases in starch, and macromolecular quantity is reduced, and small molecule quantity increases so that
The very fine starch can be preferably scattered in other components, increase its compatibility with poly (propylene carbonate)；
The concrete operation method of step (2) is：By polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, six methylenes
Group diisocyanate and 2- phenyl -2- oxazolines be put into be preheated to 50~80 DEG C, rotating speed be 80~90r/min mixed at high speed
In machine, it is stirred 5~8min；High-speed mixer heating temperature is adjusted 100~120 DEG C later, rotating speed control for 160~
180r/min mixes 45~60min, cooling auxiliary material mixture A with this condition；
The concrete operation method of step (3) is：By 1,3- dimethyl -6- semicarbazides pyrimidine, N, (2, the 6- diisopropyls of N '-two
Base phenyl) carbodiimide, distearyl pentaerythritol diphosphite, cerium stearate, bis- (the 2,4,6- trimethylbenzene first of phenyl
Acyl group) phosphine oxide and potassium chloride is put into and is preheated to 30~50 DEG C, in the high-speed mixer that rotating speed is 80~90r/min, be protected from light
It is stirred 20~25min；High-speed mixer heating temperature is adjusted 100~120 DEG C later, rotating speed control is 160~180r/
Min, is protected from light mixing 10~15min with this condition, cooling auxiliary material mixture B.
The concrete operation method of step (4) is：Very fine starch obtained by step (1), the auxiliary material obtained by step (2) is mixed
It closes object A, Styrene-Butadiene-Styrene Block Copolymer and poly (propylene carbonate) to be added in high-speed mixer, is in temperature
150~180 DEG C, rotating speed be 300-500r/min under stir 20~30min, lubricant is added later, continues at the same temperature
It is stirred 5~8min, it is so cooling that just to mix object.
Auxiliary material mixture A interacts with Styrene-Butadiene-Styrene Block Copolymer, can increase polymerized thylene carbonate
The compatibility of propyl ester and very fine starch allows masterbatch obtained to have better mechanical property, disclosure satisfy that the need of different products
It asks.
The concrete operation method of step (5) is：First mixed object obtained by step (4) and the auxiliary material obtained by step (3) is mixed
It closes object B to be added in high-speed mixer, 15~20min is stirred in the case where temperature is 80~100 DEG C, rotating speed is 300-500r/min, it
Lauric acid diethyl amide borate is added afterwards, and high-speed mixer heating temperature is adjusted to 120~150 DEG C, in this temperature
Under be stirred 20~30min, cooling blend.
Auxiliary material mixture B can assign the fabulous biology of the masterbatch with the interaction of lauric acid diethyl amide borate and drop
Performance is solved, the problem of effective solution white pollution.
The concrete operation method of step (6) is：Blend obtained by step (5) is moved into draw ratio and is more than 48:1 it is in the same direction
In double screw extruder feed bin, the technological temperature of double screw extruder is set, it is permanent after temperature reaches the technological temperature of requirement
Warm 30-35min opens double screw extruder, controls the Absolute truth reciprocal of duty cycle of double screw extruder less than 10000Pa, main-machine screw
Rotating speed is 300-500rpm, extruding pelletization, postcooling to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
Finer explanation is made to the present invention with reference to embodiment 1- embodiments 6：
Embodiment 1：
A kind of biodegradable plastic base material, it includes the following raw material calculated by ratio of weight and the number of copies：55 parts of starch, poly- carbonic acid
Sub- propyl ester 25kg, polyhydroxybutyrate valeric acid copolyesters 5kg, magnesium stearate 5kg, epoxidized soybean oil 3kg, glycerine 2kg, hexa-methylene
Diisocyanate 5kg, 2- phenyl -2- oxazolines 1kg, lubricant 1kg, Styrene-Butadiene-Styrene Block Copolymer 3kg,
1,3- dimethyl -6- semicarbazides pyrimidines 2kg, N, N '-two (2,6- diisopropyl phenyl) carbodiimide 3kg, double octadecyl seasons
Bis- (2,4,6- trimethylbenzoyls) the phosphine oxide 0.2kg of penta tetrol bis-phosphite 1kg, cerium stearate 2kg, phenyl, chlorination
Potassium 5kg, lauric acid diethyl amide borate 5kg.
Wherein, the starch is tapioca；
The lubricant is ethylene bis stearamide.
The preparation method of the biodegradable plastic base material, it is comprised the following steps that：
(1) it after starch being uniformly mixed and dried with magnesium stearate, is milled into the miniaturization that starch granules grain size is 3 μm and forms sediment
Powder, concrete operation method are：
A. after mixing by tapioca and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；It presses
The volume ratio of starch mixture and ball-milling medium is 1:2 ratio measures ball-milling medium, and then starch mixture and ball milling are situated between
Matter is poured into ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:1 ratio measures absolute ethyl alcohol simultaneously
It pours into ball grinder, ball grinder is sealed；
Wherein, the ball-milling medium selects a diameter of 10mm Ceramic Balls；
B. ball grinder is placed in the ball milling rack that rotating speed is 250rpm and carries out ball milling, after ball milling 90h, stop ball milling,
Obtain starch milk；Wherein, in mechanical milling process, observation is shut down once at interval of 15h, and add absolute ethyl alcohol, the anhydrous second added
The volume ratio for the absolute ethyl alcohol being added before alcohol and ball milling in ball grinder is 1:20；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by nothing
After water-ethanol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 50 DEG C, it is ground later, crosses 200 mesh sieve, obtain miniaturization
Starch.
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
Base -2- oxazolines are put into and are preheated to 50 DEG C, in the high-speed mixer that rotating speed is 80r/min, are stirred 5min；It later will high speed
Mixing machine heating temperature adjusts 100 DEG C, and rotating speed control is 160r/min, mixes 45min with this condition, cooling that auxiliary material mixes
Object A.
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is put into and is preheated to 30 DEG C, in the high-speed mixer that rotating speed is 80r/min, be protected from light and be stirred 20min；Later by high-speed mixer
Heating temperature adjusts 100 DEG C, and rotating speed control is 160r/min, is protected from light mixing 10min, cooling auxiliary material mixture with this condition
B。
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), styrene-butadiene-
Styrene block copolymer and poly (propylene carbonate) are added in high-speed mixer, temperature be 150 DEG C, rotating speed 300r/min
Lower stirring 20min, is added ethylene bis stearamide later, continues to be stirred 5min at the same temperature, so cooling that just to mix object.
(5) the first mixed object obtained by step (4) and the auxiliary material mixture B obtained by step (3) are added in high-speed mixer,
15min is stirred in the case where temperature is 80 DEG C, rotating speed is 300r/min, lauric acid diethyl amide borate is added later, and will be high
Fast mixing machine heating temperature is adjusted to 120 DEG C, is stirred 20min at this temperature, cooling blend.
(6) blend obtained by step (5) is moved into draw ratio and is more than 48:In 1 parallel dual-screw extruding machine feed bin, if
The technological temperature for having set double screw extruder, after temperature reaches the technological temperature of requirement, constant temperature 30min opens twin-screw and squeezes
Go out machine, it is 300rpm to control the Absolute truth reciprocal of duty cycle of double screw extruder less than 10000Pa, main-machine screw rotating speed, extruding pelletization, it
Postcooling is to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
Embodiment 2：
A kind of biodegradable plastic base material, it includes the following raw material calculated by ratio of weight and the number of copies：Starch 60kg, poly- carbonic acid
Sub- propyl ester 30kg, polyhydroxybutyrate valeric acid copolyesters 6kg, magnesium stearate 7kg, epoxidized soybean oil 5kg, glycerine 5kg, hexa-methylene
Diisocyanate 8kg, 2- phenyl -2- oxazolines 2kg, lubricant 3kg, Styrene-Butadiene-Styrene Block Copolymer 5kg,
1,3- dimethyl -6- semicarbazides pyrimidines 3kg, N, N '-two (2,6- diisopropyl phenyl) carbodiimide 5kg, double octadecyl seasons
Bis- (2,4,6- trimethylbenzoyls) the phosphine oxide 0.3kg of penta tetrol bis-phosphite 3kg, cerium stearate 5kg, phenyl, chlorination
8 parts of potassium 7kg, lauric acid diethyl amide borate.
Wherein, the starch is cornstarch；
The lubricant is oleamide.
The preparation method of the biodegradable plastic base material, it is comprised the following steps that：
(1) after cornstarch being uniformly mixed and dried with magnesium stearate, it is 5 μm fine to be milled into starch granules grain size
Change starch；Its concrete operation method is：
A. after mixing by cornstarch and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；It presses
The volume ratio of starch mixture and ball-milling medium is 1:3 ratio measures ball-milling medium, and then starch mixture and ball milling are situated between
Matter is poured into ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:1.2 ratio measures absolute ethyl alcohol
And pour into ball grinder, ball grinder is sealed；Wherein, the ball-milling medium selects a diameter of 11mm agate balls；
B. ball grinder is placed in the ball milling rack that rotating speed is 300rpm and carries out ball milling, after ball milling 100h, stop ball milling,
Obtain starch milk；Wherein, in mechanical milling process, observation is shut down once at interval of 20h, and add absolute ethyl alcohol, the anhydrous second added
The volume ratio for the absolute ethyl alcohol being added before alcohol and ball milling in ball grinder is 1:25；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by nothing
After water-ethanol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 60 DEG C, it is ground later, crosses 200 mesh sieve, obtain miniaturization
Starch.
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
Base -2- oxazolines are put into and are preheated to 80 DEG C, in the high-speed mixer that rotating speed is 90r/min, are stirred 8min；It later will high speed
Mixing machine heating temperature adjusts 120 DEG C, and rotating speed control is 180r/min, mixes 60min with this condition, cooling that auxiliary material mixes
Object A.
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is put into and is preheated to 50 DEG C, in the high-speed mixer that rotating speed is 90r/min, be protected from light and be stirred 25min；Later by high-speed mixer
Heating temperature adjusts 120 DEG C, and rotating speed control is 180r/min, is protected from light mixing 15min, cooling auxiliary material mixture with this condition
B。
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), styrene-butadiene-
Styrene block copolymer and poly (propylene carbonate) are added in high-speed mixer, temperature be 180 DEG C, rotating speed 500r/min
Lower stirring 30min, is added oleamide later, continues to be stirred 8min at the same temperature, so cooling that just to mix object.
(5) the first mixed object obtained by step (4) and the auxiliary material mixture B obtained by step (3) are added in high-speed mixer,
20min is stirred in the case where temperature is 100 DEG C, rotating speed is 500r/min, lauric acid diethyl amide borate is added later, and will be high
Fast mixing machine heating temperature is adjusted to 150 DEG C, is stirred 30min at this temperature, cooling blend.
(6) blend obtained by step (5) is moved into draw ratio and is more than 48:In 1 parallel dual-screw extruding machine feed bin, if
The technological temperature for having set double screw extruder, after temperature reaches the technological temperature of requirement, constant temperature 35min opens twin-screw and squeezes
Go out machine, it is 500rpm to control the Absolute truth reciprocal of duty cycle of double screw extruder less than 10000Pa, main-machine screw rotating speed, extruding pelletization, it
Postcooling is to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
Embodiment 3：
A kind of biodegradable plastic base material, it includes the following raw material calculated by ratio of weight and the number of copies：Starch 58kg, poly- carbonic acid
Sub- propyl ester 27kg, polyhydroxybutyrate valeric acid copolyesters 5.5kg, magnesium stearate 6kg, epoxidized soybean oil 4kg, glycerine 3kg, six methylenes
Group diisocyanate 6kg, 2- phenyl -2- oxazolines 1.5kg, lubricant 2kg, Styrene-Butadiene-Styrene Block Copolymer
4kg, 1,3- dimethyl -6- semicarbazides pyrimidines 2.5kg, N, N '-two (2,6- diisopropyl phenyl) carbodiimide 4kg, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite 2kg, cerium stearate 4kg, phenyl
0.25kg, potassium chloride 6kg, lauric acid diethyl amide borate 6kg.
Wherein, the starch is tapioca.
The lubricant is ethylene bis stearamide.
The preparation method of the biodegradable plastic base material, it is characterised in that：It is comprised the following steps that：
(1) after tapioca being uniformly mixed and dried with magnesium stearate, it is 2 μm fine to be milled into starch granules grain size
Change starch；Its concrete operation method is：
A. after mixing by tapioca and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；It presses
The volume ratio of starch mixture and ball-milling medium is 1:2.5 ratio measures ball-milling medium, then by starch mixture and ball milling
Medium pours into ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:1 ratio measures absolute ethyl alcohol
And pour into ball grinder, ball grinder is sealed；Wherein, the ball-milling medium selects a diameter of 12mm Ceramic Balls；
B. ball grinder is placed in the ball milling rack that rotating speed is 280rpm and carries out ball milling, after ball milling 100h, stop ball milling,
Obtain starch milk；Wherein, in mechanical milling process, observation is shut down once at interval of 20h, and add absolute ethyl alcohol, the anhydrous second added
The volume ratio for the absolute ethyl alcohol being added before alcohol and ball milling in ball grinder is 1:20；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by nothing
After water-ethanol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 55 DEG C, it is ground later, crosses 200 mesh sieve, obtain miniaturization
Starch.
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
Base -2- oxazolines are put into and are preheated to 60 DEG C, in the high-speed mixer that rotating speed is 85r/min, are stirred 6min；It later will high speed
Mixing machine heating temperature adjusts 110 DEG C, and rotating speed control is 170r/min, mixes 50min with this condition, cooling that auxiliary material mixes
Object A.
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is put into and is preheated to 40 DEG C, in the high-speed mixer that rotating speed is 85r/min, be protected from light and be stirred 22min；Later by high-speed mixer
Heating temperature adjusts 110 DEG C, and rotating speed control is 170r/min, is protected from light mixing 12min, cooling auxiliary material mixture with this condition
B。
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), styrene-butadiene-
Styrene block copolymer and poly (propylene carbonate) are added in high-speed mixer, temperature be 160 DEG C, rotating speed 400r/min
Lower stirring 25min, is added ethylene bis stearamide later, continues to be stirred 6min at the same temperature, so cooling that just to mix object.
(5) the first mixed object obtained by step (4) and the auxiliary material mixture B obtained by step (3) are added in high-speed mixer,
18min is stirred in the case where temperature is 95 DEG C, rotating speed is 350r/min, lauric acid diethyl amide borate is added later, and will be high
Fast mixing machine heating temperature is adjusted to 140 DEG C, is stirred 25min at this temperature, cooling blend.
(6) blend obtained by step (5) is moved into draw ratio and is more than 48:In 1 parallel dual-screw extruding machine feed bin, if
The technological temperature for having set double screw extruder, after temperature reaches the technological temperature of requirement, constant temperature 33min opens twin-screw and squeezes
Go out machine, it is 400rpm to control the Absolute truth reciprocal of duty cycle of double screw extruder less than 10000Pa, main-machine screw rotating speed, extruding pelletization, it
Postcooling is to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
Embodiment 4：
A kind of biodegradable plastic base material, it includes kg numbers by weight than the following raw material of calculating：Starch 58kg, poly- carbonic acid
Sub- propyl ester 27kg, polyhydroxybutyrate valeric acid copolyesters 5.5kg, magnesium stearate 6kg, epoxidized soybean oil 4kg, glycerine 3kg, six methylenes
Group diisocyanate 6kg, 2- phenyl -2- oxazolines 1.5kg, lubricant 2kg, Styrene-Butadiene-Styrene Block Copolymer
4kg, 1,3- dimethyl -6- semicarbazides pyrimidines 2.5kg, N, N '-two (2,6- diisopropyl phenyl) carbodiimide 4kg, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite 2kg, cerium stearate 4kg, phenyl
0.25kg, potassium chloride 6kg, lauric acid diethyl amide borate 6kg.
Wherein, the starch is potato starch.
The lubricant is ethylene bis stearamide.
The preparation method of the biodegradable plastic base material, it is characterised in that：It is comprised the following steps that：
(1) after potato starch being uniformly mixed and dried with magnesium stearate, it is 2 μm micro- to be milled into starch granules grain size
Refine starch；Its concrete operation method is：
A. after mixing by potato starch and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；
It is 1 by the volume ratio of starch mixture and ball-milling medium:2.5 ratio measures ball-milling medium, then by starch mixture and ball
Grinding media pours into ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:1 ratio measures anhydrous second
Alcohol simultaneously pours into ball grinder, and ball grinder is sealed；Wherein, the ball-milling medium selects a diameter of 12mm Ceramic Balls；
B. ball grinder is placed in the ball milling rack that rotating speed is 280rpm and carries out ball milling, after ball milling 100h, stop ball milling,
Obtain starch milk；Wherein, in mechanical milling process, observation is shut down once at interval of 20h, and add absolute ethyl alcohol, the anhydrous second added
The volume ratio for the absolute ethyl alcohol being added before alcohol and ball milling in ball grinder is 1:20；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by nothing
After water-ethanol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 55 DEG C, it is ground later, crosses 200 mesh sieve, obtain miniaturization
Starch.
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
Base -2- oxazolines are put into and are preheated to 60 DEG C, in the high-speed mixer that rotating speed is 85r/min, are stirred 6min；It later will high speed
Mixing machine heating temperature adjusts 110 DEG C, and rotating speed control is 170r/min, mixes 50min with this condition, cooling that auxiliary material mixes
Object A.
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is put into and is preheated to 40 DEG C, in the high-speed mixer that rotating speed is 85r/min, be protected from light and be stirred 22min；Later by high-speed mixer
Heating temperature adjusts 110 DEG C, and rotating speed control is 170r/min, is protected from light mixing 12min, cooling auxiliary material mixture with this condition
B。
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), styrene-butadiene-
Styrene block copolymer and poly (propylene carbonate) are added in high-speed mixer, temperature be 160 DEG C, rotating speed 400r/min
Lower stirring 25min, is added ethylene bis stearamide later, continues to be stirred 6min at the same temperature, so cooling that just to mix object.
(5) the first mixed object obtained by step (4) and the auxiliary material mixture B obtained by step (3) are added in high-speed mixer,
18min is stirred in the case where temperature is 95 DEG C, rotating speed is 350r/min, lauric acid diethyl amide borate is added later, and will be high
Fast mixing machine heating temperature is adjusted to 140 DEG C, is stirred 25min at this temperature, cooling blend.
(6) blend obtained by step (5) is moved into draw ratio and is more than 48:In 1 parallel dual-screw extruding machine feed bin, if
The technological temperature for having set double screw extruder, after temperature reaches the technological temperature of requirement, constant temperature 33min opens twin-screw and squeezes
Go out machine, it is 400rpm to control the Absolute truth reciprocal of duty cycle of double screw extruder less than 10000Pa, main-machine screw rotating speed, extruding pelletization, it
Postcooling is to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
Embodiment 5：
A kind of biodegradable plastic base material, it includes kg numbers by weight than the following raw material of calculating：Starch 58kg, poly- carbonic acid
Sub- propyl ester 27kg, polyhydroxybutyrate valeric acid copolyesters 5.5kg, magnesium stearate 6kg, epoxidized soybean oil 4kg, glycerine 3kg, six methylenes
Group diisocyanate 6kg, 2- phenyl -2- oxazolines 1.5kg, lubricant 2kg, Styrene-Butadiene-Styrene Block Copolymer
4kg, 1,3- dimethyl -6- semicarbazides pyrimidines 2.5kg, N, N '-two (2,6- diisopropyl phenyl) carbodiimide 4kg, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite 2kg, cerium stearate 4kg, phenyl
0.25kg, potassium chloride 6kg, lauric acid diethyl amide borate 6kg.
Wherein, the starch is tapioca.
The lubricant is stearic acid.
The preparation method of the biodegradable plastic base material, it is characterised in that：It is comprised the following steps that：
(1) after tapioca being uniformly mixed and dried with magnesium stearate, it is 2 μm fine to be milled into starch granules grain size
Change starch；Its concrete operation method is：
A. after mixing by tapioca and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；It presses
The volume ratio of starch mixture and ball-milling medium is 1:2.5 ratio measures ball-milling medium, then by starch mixture and ball milling
Medium pours into ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:1 ratio measures absolute ethyl alcohol
And pour into ball grinder, ball grinder is sealed；Wherein, the ball-milling medium selects a diameter of 12mm Ceramic Balls；
B. ball grinder is placed in the ball milling rack that rotating speed is 280rpm and carries out ball milling, after ball milling 100h, stop ball milling,
Obtain starch milk；Wherein, in mechanical milling process, observation is shut down once at interval of 20h, and add absolute ethyl alcohol, the anhydrous second added
The volume ratio for the absolute ethyl alcohol being added before alcohol and ball milling in ball grinder is 1:20；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by nothing
After water-ethanol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 55 DEG C, it is ground later, crosses 200 mesh sieve, obtain miniaturization
Starch.
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
Base -2- oxazolines are put into and are preheated to 60 DEG C, in the high-speed mixer that rotating speed is 85r/min, are stirred 6min；It later will high speed
Mixing machine heating temperature adjusts 110 DEG C, and rotating speed control is 170r/min, mixes 50min with this condition, cooling that auxiliary material mixes
Object A.
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is put into and is preheated to 40 DEG C, in the high-speed mixer that rotating speed is 85r/min, be protected from light and be stirred 22min；Later by high-speed mixer
Heating temperature adjusts 110 DEG C, and rotating speed control is 170r/min, is protected from light mixing 12min, cooling auxiliary material mixture with this condition
B。
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), styrene-butadiene-
Styrene block copolymer and poly (propylene carbonate) are added in high-speed mixer, temperature be 160 DEG C, rotating speed 400r/min
Lower stirring 25min, is added stearic acid later, continues to be stirred 6min at the same temperature, so cooling that just to mix object.
(5) the first mixed object obtained by step (4) and the auxiliary material mixture B obtained by step (3) are added in high-speed mixer,
18min is stirred in the case where temperature is 95 DEG C, rotating speed is 350r/min, lauric acid diethyl amide borate is added later, and will be high
Fast mixing machine heating temperature is adjusted to 140 DEG C, is stirred 25min at this temperature, cooling blend.
(6) blend obtained by step (5) is moved into draw ratio and is more than 48:In 1 parallel dual-screw extruding machine feed bin, if
The technological temperature for having set double screw extruder, after temperature reaches the technological temperature of requirement, constant temperature 33min opens twin-screw and squeezes
Go out machine, it is 400rpm to control the Absolute truth reciprocal of duty cycle of double screw extruder less than 10000Pa, main-machine screw rotating speed, extruding pelletization, it
Postcooling is to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
Embodiment 6：Biodegradable plastic base material prepared by Examples 1 to 5 carries out elongation at break according to GB1040-79
With the test of tensile strength, test result is shown in Table 1；Life life prepared by Examples 1 to 5 is measured using the detection method of ISO14855
The degree of degradation of object degradable plastics mother material, test result are shown in Table 1.
Biological degradation rate is measured using the detection method of ISO14855：Measure need of the plastic material under controllable composting conditions
Oxygen biodegradability and structure crumble experimental method-Analysis for CO of performance2The method of yield.It is provided in ISO14855：With
Reference material of the cellulose of energy complete biodegradable as test plastic material degradation rate, test experiments are after 85 days, reference
The biological degradation rate of material is as degradable more than 80%.
The degradation rate of existing starch type biodegradable plastic material is relatively low, national sector standard QB/T2461-1999 (packagings
With degrading polyethylene film) for regulation degradation rate not less than 20%, environmental labelling product technology requires HJBI12-2000 (packing articles)
Provide that degradation rate is not less than 15%.Therefore from the data in above table can be seen that the present invention plastic matrix be can be complete
Degradation.
Table 1
| Embodiment | 1 | 2 | 3 | 4 | 5 |
| Elongation at break (%) | 560 | 555 | 579 | 576 | 573 |
| Tensile strength (MPa) | 15 | 16 | 20 | 15 | 18 |
| Biological degradation rate (%) | 92.1 | 91.3 | 95.3 | 93.3 | 93.2 |
Claims (10)
1. a kind of biodegradable plastic base material, it is characterised in that：It includes the following raw material calculated by ratio of weight and the number of copies：Starch
55-60 parts, 25-30 parts of poly (propylene carbonate), 5-6 parts of polyhydroxybutyrate valeric acid copolyesters, 5-7 parts of magnesium stearate, epoxy soybean
3-5 parts oily, 2-5 parts of glycerine, 5-8 parts of hexamethylene diisocyanate, 1-2 parts of 2- phenyl -2- oxazolines, 1-3 parts of lubricant, benzene
3-5 parts of ethylene-butadiene-styrene block copolymer, 2-3 parts of 1,3- dimethyl -6- semicarbazides pyrimidines, N, N '-two (2,6- bis-
Isopropyl phenyl) 3-5 parts of carbodiimide, 1-3 parts of distearyl pentaerythritol diphosphite, 2-5 parts of cerium stearate, phenyl
Bis- 0.2-0.3 parts of (2,4,6- trimethylbenzoyls) phosphine oxides, 5-7 parts of potassium chloride, lauric acid diethyl amide borate 5-8
Part.
2. biodegradable plastic base material according to claim 1, it is characterised in that：The starch is wheaten starch, corn
The mixture of one or more of starch, tapioca, potato starch.
3. biodegradable plastic according to claim 1, it is characterised in that：It include calculate by ratio of weight and the number of copies it is as follows
Raw material：58 parts of starch, 27 parts of poly (propylene carbonate), 5.5 parts of polyhydroxybutyrate valeric acid copolyesters, 6 parts of magnesium stearate, epoxy soybean
4 parts of oil, 3 parts of glycerine, 6 parts of hexamethylene diisocyanate, 1.5 parts of 2- phenyl -2- oxazolines, 2 parts of lubricant, styrene-fourth
4 parts of styrene block copolymer, 2.5 parts of 1,3- dimethyl -6- semicarbazides pyrimidine, N, (2, the 6- diisopropyl benzenes of N '-two
Base) 4 parts of carbodiimide, 2 parts of distearyl pentaerythritol diphosphite, 4 parts of cerium stearate, bis- (the 2,4,6- front threes of phenyl
Base benzoyl) 0.25 part of phosphine oxide, 6 parts of potassium chloride, 6 parts of lauric acid diethyl amide borate.
4. the preparation method of the biodegradable plastic base material according to claim 1-3 any one, it is characterised in that：It is wrapped
Include following processing step：
(1) it after starch being uniformly mixed and dried with magnesium stearate, is milled into the miniaturization that starch granules grain size is 2-5 μm and forms sediment
Powder；
(2) by polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- phenyl-
After 2- oxazoline immixtures, auxiliary material mixture A is obtained；
(3) by 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double octadecyls
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride carry out
It is stirred, obtains auxiliary material mixture B；
(4) by the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), lubricant, styrene-fourth two
Alkene-styrene block copolymer and poly (propylene carbonate) are stirred mixing, obtain just mixed object；
(5) by the first mixed object obtained by step (4), the auxiliary material mixture B obtained by step (3) and lauric acid diethyl amide boric acid
Ester is stirred mixing, obtains blend；
(6) by obtained by step (5) blend move into double screw extruder in, carry out extruding pelletization, postcooling to get described
Biodegradable plastic base material.
5. the preparation method of biodegradable plastic base material according to claim 4, it is characterised in that：Step (1) it is specific
Operating method is：
A. after mixing by starch and magnesium stearate, dry to be less than 10% to water content, obtain starch mixture；It is mixed by starch
The volume ratio of object and ball-milling medium is 1:The ratio of 2-3 measures ball-milling medium, then pours into starch mixture and ball-milling medium
In ball grinder；Later, it is 1 by the volume ratio of starch mixture and absolute ethyl alcohol:The ratio of 1-1.2 measures absolute ethyl alcohol and falls
Enter in ball grinder, ball grinder is sealed；Wherein, the ball-milling medium is Ceramic Balls or agate of the diameter within the scope of 10-12mm
Ball；
B. ball grinder is placed in the ball milling rack that rotating speed is 250-300rpm and carries out ball milling, after ball milling 90-100h, stop ball
Mill, obtains starch milk；Wherein, it in mechanical milling process, shuts down observation once at interval of 15-20h, and add absolute ethyl alcohol, adds
The volume ratio for the absolute ethyl alcohol being added before absolute ethyl alcohol and ball milling in ball grinder is 1:20-25；
C. stop ball milling, the taking-up of the starch milk of gained is placed in container, vacuum, which inhales to consider, sloughs absolute ethyl alcohol and by anhydrous second
After alcohol is recycled, the wet product of starch is obtained；
D. the wet product of starch obtained by step c is dry at 50-60 DEG C, it is ground later, crosses 200 mesh sieve, obtain miniaturization
Starch.
6. the preparation method of biodegradable plastic base material according to claim 4, it is characterised in that：Step (2) it is specific
Operating method is：By polyhydroxybutyrate valeric acid copolyesters, epoxidized soybean oil, glycerine, hexamethylene diisocyanate and 2- benzene
Base -2- oxazolines are put into and are preheated to 50~80 DEG C, in the high-speed mixer that rotating speed is 80~90r/min, it is stirred 5~
8min；High-speed mixer heating temperature is adjusted 100~120 DEG C later, rotating speed control is 160~180r/min, in this condition
Lower mixing 45~60min, cooling auxiliary material mixture A.
7. the preparation method of biodegradable plastic base material according to claim 4, it is characterised in that：Step (3) it is specific
Operating method is：By 1,3- dimethyl -6- semicarbazides pyrimidine, N, N '-two (2,6- diisopropyl phenyl) carbodiimide, double 18
Bis- (2,4,6- trimethylbenzoyls) phosphine oxides of alkyl pentaerythritol bis-phosphite, cerium stearate, phenyl and potassium chloride
It is put into and is preheated to 30~50 DEG C, in the high-speed mixer that rotating speed is 80~90r/min, be protected from light and be stirred 20~25min；Later
High-speed mixer heating temperature is adjusted 100~120 DEG C, rotating speed control is 160~180r/min, is protected from light mixing with this condition
10~15min, cooling auxiliary material mixture B.
8. the preparation of biodegradable plastic base material according to claim 4, it is characterised in that：The concrete operations of step (4)
Method is：By the very fine starch obtained by step (1), the auxiliary material mixture A obtained by step (2), styrene-butadiene-benzene second
Alkene block copolymer and poly (propylene carbonate) are added in high-speed mixer, temperature be 150~180 DEG C, rotating speed 300-
20~30min is stirred under 500r/min, lubricant is added later, continues to be stirred 5~8min at the same temperature, cooling
Just mixed object.
9. the preparation method of biodegradable plastic base material according to claim 4, it is characterised in that：Step (5) it is specific
Operating method is：First mixed object obtained by step (4) and the auxiliary material mixture B obtained by step (3) are added in high-speed mixer,
15~20min is stirred in the case where temperature is 80~100 DEG C, rotating speed is 300-500r/min, and lauric acid diethyl amide is added later
Borate, and high-speed mixer heating temperature is adjusted to 120~150 DEG C, it is stirred 20~30min at this temperature, it is cold
But blend is obtained.
10. the preparation method of biodegradable plastic base material according to claim 4, it is characterised in that：Step (6) it is specific
Operating method is：Blend obtained by step (5) is moved into draw ratio and is more than 48:In 1 parallel dual-screw extruding machine feed bin, if
The technological temperature for having set double screw extruder, after temperature reaches the technological temperature of requirement, constant temperature 30-35min opens twin-screw
Extruder, the Absolute truth reciprocal of duty cycle for controlling double screw extruder is less than 10000Pa, main-machine screw rotating speed is 300-500rpm, squeezes out
Be granulated, postcooling to get the biodegradable plastic base material；
Wherein, the technological temperature of double screw extruder such as following table：
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