CN101560329B - Coal-dust-modified soybean protein plastic and preparation method thereof - Google Patents
Coal-dust-modified soybean protein plastic and preparation method thereof Download PDFInfo
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- CN101560329B CN101560329B CN2009100227550A CN200910022755A CN101560329B CN 101560329 B CN101560329 B CN 101560329B CN 2009100227550 A CN2009100227550 A CN 2009100227550A CN 200910022755 A CN200910022755 A CN 200910022755A CN 101560329 B CN101560329 B CN 101560329B
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Abstract
The invention discloses coal-dust-modified soybean protein plastic and a preparation method thereof. The prepared coal-dust-modified soybean protein plastic consists of soybean protein powder, coal dust, plasticizer and interface modifier, wherein, mass percentages of the components are as follows: 30%-74% of soybean protein powder, 1%-45% of coal dust, 25%-40% of plasticizer and 0-9% of interfacemodifier. The preparation method comprises the steps as follows: first, the soybean protein powder and the coal dust are fully stirred and mixed according to proportion by a high-speed mixer; second, the plasticizer is added into the mixture according to proportion and is fully mixed; third, standing is carried out on the mixture at 2-6 DEG C for 19-29 hours, thereby realizing evenness; and fourt h, moulding is carried out by die pressing. The preparation method of the invention has simple preparation process, convenient operation and low cost. The prepared coal-dust-modified soybean protein plastic has excellent quality and relatively good mechanical property and water resistance.
Description
Technical field
The invention belongs to natural multi-component multiphase polymer material technical field, especially relate to a kind of coal-dust-modified soybean protein plastic and preparation method thereof.
Background technology
The natural reproducible macromolecular material as the potential substitute of petroleum base industrial chemicals macromolecular material, when being used to prepare plastics, can effectively reduce environmental pollution, its wide material sources and with low cost.The defatted soyflour (DSF), soybean protein concentrate (SPC) and the soybean protein isolate (SPI) that utilize dregs of beans to purify in recent years receive much concern for the plastic of soybean protein of raw material.Though pure plastic of soybean protein intensity is higher, can directly use as engineering plastics; But its processing difficulties need to add softening agent, causes the strength of materials sharply to descend thereupon, and its mechanical property and volume stability be subjected to the influence of moisture very big, and this also is the major cause that the puzzlement plastic of soybean protein is used.At plastic of soybean protein; the method of having attempted multiple physics and chemical modification is improved the processing characteristics of plastic of soybean protein, mechanical property and water tolerance, for example aldehydes is cross-linking modified, sodium lauryl sulphate modification, Guanidinium hydrochloride modification, acetylize modification, with other natural Biodegradable material blending and modifying, GMA graft modification, methacrylic acid graft modification, with methods such as coal, poly-phosphate or xylogen are filling-modified.Wherein, can effectively improve the water tolerance and the mechanical property of soy protein plastic with rigid-particle filled modification.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of quality good at above-mentioned deficiency of the prior art, has mechanical property and water-proof coal-dust-modified soybean protein plastic preferably.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of coal-dust-modified soybean protein plastic, it is characterized in that: form by soybean protein powder, coal dust, softening agent and interface modifier, and the mass percent of each component is respectively: soybean protein powder 30～74%, coal dust 1～45%, softening agent 25～40%, interface modifier 0～9%; Described soybean protein powder is that defatted soyflour, the concentrated albumen-powder of soybeans or soybean isolate protein powder and its granularity are 200～500 orders, and the water content of described soybean protein powder is lower than 10wt%; Described coal dust is that brown coal, bituminous coal or weathered coal and its particle diameter are D
505～7 μ m, the water content of described coal dust is lower than wt5%; Described softening agent is that polyvalent alcohol and its water content are lower than 1wt%; Described interface modifier is that intramolecule contains two keys and one or more end group is the improving agent of epoxy group(ing).
Described polyvalent alcohol is that the purity of glycerine and described glycerine is analytical pure.
Described interface modifier is a glycidyl methacrylate.
The present invention also provides the preparation method of a kind of technology coal-dust-modified soybean protein plastic simple, easy to operate and with low cost, it is characterized in that this method may further comprise the steps:
Step 1, after thorough mixing stirs in proportion with described soybean protein powder and coal dust with homogenizer, make powder mix one;
Step 2, described powder mix one is being continued in the high-speed stirring process with described homogenizer, in described powder mix one, add polyvalent alcohol in proportion, and will make mixture one after described polyvalent alcohol and the powder mix one full and uniform mixing as softening agent;
Step 3, described mixture one is left standstill 24 ± 5h under 4 ± 2 ℃ of temperature condition, make its homogenization;
Step 4, compression molding: after adopting hot-press equipment that the mixture after leaving standstill is carried out compression molding, obtain the finished product sheet material, the pressure of its compression molding is 13～20MPa, and temperature is 130～155 ℃, and the time is 3～20min;
The stirring velocity of homogenizer described in above-mentioned steps one and the step 2 is 600～1000rpm.
Described in the above-mentioned steps two in described powder mix one, add polyvalent alcohol in proportion the time, should guarantee that the temperature of described powder mix one is lower than 25 ℃.
Described in the above-mentioned steps one before thorough mixing stirs in proportion with described soybean protein powder and coal dust with homogenizer, earlier described interface modifier is added in the described coal dust in proportion, and with making the modification coal dust after the stirring of homogenizer thorough mixing; Again described soybean protein powder is added in the described modification coal dust in proportion, and after the homogenizer thorough mixing stirs, makes powder mix one.
Described in the above-mentioned steps one after thorough mixing stirs in proportion with described soybean protein powder and coal dust with homogenizer, also need to add described interface modifier in proportion in the powder mix after thorough mixing stirs, and after the homogenizer thorough mixing stirs, make powder mix one.
The best stirring velocity of homogenizer described in above-mentioned steps one and the step 2 is 1000rpm.
Hot-press equipment described in the above-mentioned steps four is the lithographic plate vulcanizer.
In the compression molding process described in the above-mentioned steps four, earlier under 3～5MPa pressure to described mixture one preheating 4～6min after leaving standstill after, again with exert pressure to 13～20MPa and at 145～155 ℃ of following mold pressing 4～6min.
The present invention compared with prior art has the following advantages: 1, preparation technology is simple and easy to operate, implements easily.2, reasonable in design, workable, flexible operation mode, in the concrete preparation process, coal that can be by regulating coal dust and the usage quantity that addition, interface improving agent are glycidyl methacrylate and with the ratio of glycerine, the physicals of regulating coal-dust-modified soybean protein matter plastics.3, low production cost and environmental friendliness, environment does not cause other detrimentally affect to external world.4, prepared coal-dust-modified soybean protein plastic quality is good, has mechanical property and water tolerance preferably.5, can improve soy protein products and the difficult added value of utilizing coal, have important social benefit and environmental benefit.In sum, preparation technology of the present invention is simple, easy to operate and with low cost, and prepared coal-dust-modified soybean protein plastic quality is good, has mechanical property and water tolerance preferably.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Coal-dust-modified soybean protein plastic of the present invention is made up of soybean protein powder, coal dust, softening agent and interface modifier, and the mass percent of each component is respectively: soybean protein powder 30～74%, coal dust 1～45%, softening agent 25～40%, interface modifier 0～9%.
Described soybean protein powder is that defatted soyflour, the concentrated albumen-powder of soybeans or soybean isolate protein powder and its granularity are 200～500 orders, and the water content of described soybean protein powder is lower than 10wt%.Described coal dust is that brown coal, bituminous coal or weathered coal and its particle diameter are D
505～7 μ m, the water content of described coal dust is lower than wt5%.Described softening agent is that polyvalent alcohol and its water content are lower than 1wt%.Described interface modifier is that intramolecule contains two keys and one or more end group is the improving agent of epoxy group(ing).Described brown coal and bituminous coal are two coals of defined among " Chinese Coal Classification " standard GB5751-86.
As shown in Figure 1, the preparation method of coal-dust-modified soybean protein plastic of the present invention may further comprise the steps:
Step 1, with homogenizer with described soybean protein powder and coal dust in proportion thorough mixing make powder mix one after stirring.The stirring velocity of described homogenizer is 600～1000rpm.
Step 2, described powder mix one is being continued in the high-speed stirring process with described homogenizer, in described powder mix one, add polyvalent alcohol in proportion, and will make mixture one after described polyvalent alcohol and the powder mix one full and uniform mixing as softening agent.In this step, the stirring velocity of described homogenizer is 600～1000rpm, when adding an amount of polyvalent alcohol as softening agent in proportion in described powder mix one, should guarantee that the temperature of described powder mix one is lower than 25 ℃.
When adding interface modifier, described interface modifier can add in the coal dust coal dust mixes stirring with soybean protein powder before; Also can mixing stirring with soybean protein powder after, add in the powder mix of soybean protein powder and coal dust coal dust.
Step 3, described mixture one is left standstill 24 ± 5h under 4 ± 2 ℃ of temperature condition, make its homogenization.
Step 4, compression molding: after adopting hot-press equipment that the mixture after leaving standstill is carried out compression molding, obtain the finished product sheet material, the pressure of its compression molding is 13～20MPa, and temperature is 130～155 ℃, and the time is 3～20min.
Embodiment 1
The raw material of present embodiment consists of: soybean protein powder 74g, coal dust 1g, softening agent 25g.In the present embodiment, do not add interface modifier.Described soybean protein powder is that its granularity of soybean isolate protein powder is 200～500 orders, is specially cockchafer 2000 type food level soybean protein powders, and wherein protein content is 83.14wt%, and moisture content is 6.12wt%.Described coal dust is brown coal, and the particle diameter that is specially Yunnan Roots's brown coal and described coal dust is D
506.88 μ m.Described softening agent is that polyvalent alcohol is that the purity of glycerine and described glycerine is analytical pure.During actual processing and fabricating, described soybean protein powder can also be defatted soyflour or the concentrated albumen-powder of soybeans, and the particle diameter of described coal dust can be at D
50Adjust accordingly between 5～7 μ m.
The preparation method of present embodiment is: step 1, earlier take by weighing 74g soybean isolate protein powder and 1g coal dust respectively, afterwards 74g soybean isolate protein powder and 1g coal dust are put into described homogenizer and carried out thorough mixing and stir, make powder mix one; The stirring velocity of described homogenizer is that 1000rpm and mixing churning time are 10min.
Step 2, take by weighing 25g glycerine, with described homogenizer described powder mix one is continued in the high-speed stirring process, in described powder mix one, dropwise add 25g glycerine with dropper, and glycerine and the described powder mix that is added made mixture one after the full and uniform mixing of high speed; The stirring velocity of described homogenizer is 1000rpm.
Step 3, with described mixture one under 4 ℃ of temperature condition, leave standstill 24h and make its homogenization.In the actual fabrication process, can adopt refrigeration equipment that the temperature of described mixture one is remained on 4 ℃.
Step 4, employing hot-press equipment carry out compression molding to the mixture after leaving standstill and obtain the finished product sheet material.In the compression molding process, earlier under 3～5MPa pressure to described mixture one preheating 4～6min after leaving standstill after, again with exert pressure to 13～20MPa and at 145～155 ℃ of following mold pressing 4～6min.Specifically be earlier behind preheating 5min under 3～5MPa pressure, be forced into 14MPa again and under 150 ℃ of temperature condition mold pressing 5min, shed pressure afterwards, after in air, cooling off 3min, open mould, take out sample, promptly make the finished product sheet material of coal-dust-modified soybean protein plastic; Described hot-press equipment is the lithographic plate vulcanizer.
Embodiment 2
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 72g, coal dust 3g, softening agent 25g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 3
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 70g, coal dust 5g, softening agent 25g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 4
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 65g, coal dust 10g, softening agent 25g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 5
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 55g, coal dust 20g, softening agent 25g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 6
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 45g, coal dust 30g, softening agent 25g.
The preparation method of present embodiment is identical with embodiment 1.
The performance perameter of prepared coal-dust-modified soybean protein plastic is as shown in table 1 among the embodiment 1 to embodiment 6:
The performance perameter of table 1 coal-dust-modified soybean protein plastic
In the table 1, mechanical property test to coal-dust-modified soybean protein plastic is carried out on KD-50 type electronic universal experimental machine and XJ-40A plastic shock-testing machine, and, and before test, carry out status adjustment according to the sample of plastics mechanical test method general provisions (GB/T 1039-92) regulation preparation test.Wherein tensile strength and elongation at break carry out according to plastic tensile method for testing performance (GB/T 1040-92), and sample is the II type, and rate of extension is 50mm/min.Flexural strength is carried out according to plastics bending property test method (GB/T 9341-2000), standard test specimen (length * wide * thick=80 * 10 * 4), and span 64mm, pressure head speed is 2mm/min.Shock strength is carried out according to rigid plastics charpy impact test method (GB/T 1043-93), with non-notch sample (length * wide * thick=50 * 6 * 4), supports wire spacing 40mm.In addition, every test of each sample, equal parallel testings more than 6 times, the make even arithmetical av of capable test value of test result.Water-intake rate test is the water content that leaves standstill sheet material behind the 24h ratio with the initial state dry mass.
Embodiment 7
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 30g, coal dust 45g, softening agent 25g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 8
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 45g, coal dust 20g, softening agent 35g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 9
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 42g, coal dust 18g, softening agent 40g.
The preparation method of present embodiment is identical with embodiment 1.
Embodiment 10
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 64g, coal dust 10g, softening agent 25g, interface modifier 1g.Described softening agent is a glycerine, and described interface modifier is glycidyl methacrylate (GMA, an analytical pure).
The preparation method of present embodiment is: step 1: take by weighing earlier 10g coal dust and 1g interface modifier respectively, and be added to the 1g interface modifier in the 10g coal dust and with after the described homogenizer thorough mixing stirring, make the modification coal dust; Afterwards, take by weighing the 64g soybean protein powder again and be added in the described modification coal dust, stir 15min with homogenizer under the 1000rpm stirring velocity, thorough mixing makes powder mix one after evenly.
Step 2, described powder mix one is continued in the high-speed stirring process with described homogenizer, in described powder mix one, dropwise add 25g glycerine with dropper, and glycerine and the described powder mix that is added made mixture one after the full and uniform mixing of high speed; The stirring velocity of described homogenizer is 1000rpm.
Step 3, with described mixture one under 4 ℃ of temperature condition, leave standstill 24h and make its homogenization.
Step 4, employing lithographic plate vulcanizer carry out compression molding to the mixture after leaving standstill and obtain the finished product sheet material.In the compression molding process, behind preheating 5min under 3～5MPa pressure, be forced into 14MPa again and mold pressing 5min under 150 ℃ of temperature condition earlier, shed pressure afterwards, in air, behind the cooling 3min, open mould, take out sample, promptly make the finished product sheet material of coal-dust-modified soybean protein plastic.
Embodiment 11
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 62g, coal dust 10g, softening agent 25g, interface modifier 3g.
The preparation method of present embodiment is identical with embodiment 10.
Embodiment 12
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 60g, coal dust 10g, softening agent 25g, interface modifier 5g.
The preparation method of present embodiment is identical with embodiment 10.
Embodiment 13
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 58g, coal dust 10g, softening agent 25g, interface modifier 7g.
The preparation method of present embodiment is identical with embodiment 10.
Embodiment 14
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 56g, coal dust 10g, softening agent 25g, interface modifier 9g.
The preparation method of present embodiment is identical with embodiment 10.
The performance perameter of prepared coal-dust-modified soybean protein plastic is as shown in table 2 among the embodiment 10 to embodiment 14:
The performance perameter of table 2 coal-dust-modified soybean protein plastic
In the table 2, mechanical property test to coal-dust-modified soybean protein plastic is carried out on KD-50 type electronic universal experimental machine and XJ-40A plastic shock-testing machine equally, and, and before test, carry out status adjustment according to the sample of plastics mechanical test method general provisions (GB/T 1039-92) regulation preparation test.Wherein tensile strength and elongation at break carry out according to plastic tensile method for testing performance (GB/T 1040-92), and sample is the II type, and rate of extension is 50mm/min.Flexural strength is carried out according to plastics bending property test method (GB/T 9341-2000), standard test specimen (length * wide * thick=80 * 10 * 4), and span 64mm, pressure head speed is 2mm/min.Shock strength is carried out according to rigid plastics charpy impact test method (GB/T 1043-93), with non-notch sample (length * wide * thick=50 * 6 * 4), supports wire spacing 40mm.In addition, every test of each sample, equal parallel testings more than 6 times, the make even arithmetical av of capable test value of test result.Water-intake rate test is the water content that leaves standstill sheet material behind the 24h ratio with the initial state dry mass.
Embodiment 15
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 45g, coal dust 20g, softening agent 30g, interface modifier 5g.
The preparation method of present embodiment is identical with embodiment 10.
Embodiment 16
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 30g, coal dust 23g, softening agent 38g, interface modifier 9g.
The preparation method of present embodiment is identical with embodiment 10.
Embodiment 17
Present embodiment is as different from Example 10: the present embodiment raw material consists of: soybean protein powder 30g, coal dust 23g, softening agent 38g, interface modifier 9g.
The preparation method of present embodiment is identical with embodiment 10.
Embodiment 18
Present embodiment is as different from Example 1: the present embodiment raw material consists of: soybean protein powder 65g, coal dust 10g, softening agent 20g, interface modifier 5g.Described coal dust is that the coal sample of picking up from Yunnan Roots is Roots's brown coal, and the particle diameter of described coal dust is D
90≤ 12 μ m, described interface modifier are glycidyl methacrylate (GMA, analytical pure), and described softening agent is a glycerine.
The preparation method of present embodiment is: step 1: take by weighing earlier 65g soybean protein powder and 10g coal dust respectively, and the two is carried out thorough mixing with homogenizer with the stirring velocity of 1000rpm stir, churning time is 15min; Afterwards, the corresponding again 5g of taking by weighing glycidyl methacrylate is also added it in powder mix of soybean protein powder and coal dust to, and make powder mix one after the homogenizer thorough mixing stirs, this moment, the stirring velocity of described homogenizer was that 1000rpm and churning time are 10min.
Step 2, described powder mix one is continued in the high-speed stirring process with described homogenizer, in described powder mix one, dropwise add 20g glycerine with dropper, and glycerine and the described powder mix that is added made mixture one after the full and uniform mixing of high speed; The stirring velocity of described homogenizer is 1000rpm.
Step 3, with described mixture one under 4 ℃ of temperature condition, leave standstill 24h and make its homogenization.
Step 4, employing lithographic plate vulcanizer carry out compression molding to the mixture after leaving standstill and obtain the finished product sheet material.In the compression molding process, behind preheating 5min under 3～5MPa pressure, be forced into 14MPa again and mold pressing 5min under 150 ℃ of temperature condition earlier, shed pressure afterwards, in air, behind the cooling 3min, open mould, take out sample, promptly make the finished product sheet material of coal-dust-modified soybean protein plastic.
Embodiment 19
Present embodiment is as different from Example 18: described coal dust is that the coal sample of picking up from Qufu, Shandong is Qufu coal, and the particle diameter of described coal dust is D
90≤ 12 μ m.
The preparation method of present embodiment is identical with embodiment 10, embodiment 18.
Embodiment 20
Present embodiment is as different from Example 18: described coal dust is that the coal sample of picking up from four ditches in Shenmu County, Shaanxi is a shenfu coal, and the particle diameter of described coal dust is D
90≤ 12 μ m.
The preparation method of present embodiment is identical with embodiment 10, embodiment 18.
Embodiment 21
Present embodiment is as different from Example 18: described coal dust is that the coal sample of picking up from four ditches in Shenmu County, Shaanxi is a shenfu coal, and the particle diameter of described coal dust is D
90≤ 12 μ m.
The preparation method of present embodiment is identical with embodiment 10, embodiment 18.
Embodiment 22
Present embodiment is as different from Example 18: described coal dust is that the coal sample of picking up from Huaying hill clear water hole, Sichuan is the Huaying hill coal, and the particle diameter of described coal dust is D
90≤ 12 μ m.
The preparation method of present embodiment is identical with embodiment 10, embodiment 18.
Embodiment 23
Present embodiment is as different from Example 18: described coal dust is that the coal sample of picking up from Tongchuan, Shaanxi Xu Jiagou is Tongchuan coal, and the particle diameter of described coal dust is D
90≤ 12 μ m.
The preparation method of present embodiment is identical with embodiment 10, embodiment 18.
Embodiment 24
Present embodiment is as different from Example 18: described coal dust is that the coal sample of picking up from Hancheng, Shaanxi horse irrigation canals and ditches is the Hancheng coal, and the particle diameter of described coal dust is D
90≤ 12 μ m.
The preparation method of present embodiment is identical with embodiment 10, embodiment 18.
Among the embodiment 18 to embodiment 24, the technical analysis and the results of elemental analyses of the coal sample that adopts see Table 3:
The technical analysis of the former coal sample of table 3 and ultimate analysis (wt%)
Among the embodiment 18 to embodiment 24, the performance perameter of prepared coal-dust-modified soybean protein plastic is as shown in table 4:
The performance perameter of table 4 coal-dust-modified soybean protein plastic
In the table 4, mechanical property test to coal-dust-modified soybean protein plastic is carried out on KD-50 type electronic universal experimental machine and XJ-40A plastic shock-testing machine equally, and, and before test, carry out status adjustment according to the sample of plastics mechanical test method general provisions (GB/T 1039-92) regulation preparation test.Tensile strength and elongation at break carry out according to plastic tensile method for testing performance (GB/T 1040-92), and sample is the II type, and rate of extension is 50mm/min.Flexural strength is carried out according to plastics bending property test method (GB/T 9341-2000), standard test specimen (length * wide * thick=80 * 10 * 4), and span 64mm, pressure head speed is 2mm/min.Shock strength is carried out according to rigid plastics charpy impact test method (GB/T 1043-93), with non-notch sample (length * wide * thick=50 * 6 * 4), supports wire spacing 40mm.In addition, every test of each sample, equal parallel testings more than 6 times, the make even arithmetical av of capable test value of test result.The water-intake rate test is the water content of sheet material behind the 24h and the ratio of initial state dry mass.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (8)
1. coal-dust-modified soybean protein plastic, it is characterized in that: form by soybean protein powder, coal dust, softening agent and interface modifier, and the mass percent of each component is respectively: soybean protein powder 30～64%, coal dust 1～45%, softening agent 25～40%, interface modifier 1～9%, each component concentration sum is 100%; Described soybean protein powder is that defatted soyflour, the concentrated albumen-powder of soybeans or soybean isolate protein powder and its granularity are 200～500 orders, and the water content of described soybean protein powder is lower than 10wt%; Described coal dust is that brown coal, bituminous coal or weathered coal and its particle diameter are D
505～7 μ m, the water content of described coal dust is lower than 5wt%; Described softening agent is that polyvalent alcohol and its water content are lower than 1wt%; Described interface modifier is that intramolecule contains two keys and one or more end group is the improving agent of epoxy group(ing).
2. according to the described coal-dust-modified soybean protein plastic of claim 1, it is characterized in that: described polyvalent alcohol is that the purity of glycerine and described glycerine is analytical pure.
3. according to claim 1 or 2 described coal-dust-modified soybean protein plastics, it is characterized in that: described interface modifier is a glycidyl methacrylate.
4. one kind prepares the method for coal-dust-modified soybean protein plastic according to claim 1, it is characterized in that this method may further comprise the steps:
Step 1, after thorough mixing stirs in proportion with described soybean protein powder and coal dust with homogenizer, make powder mix one;
Described in the step 1 before thorough mixing stirs in proportion with described soybean protein powder and coal dust with homogenizer, earlier described interface modifier is added in the described coal dust in proportion, and with making the modification coal dust after the stirring of homogenizer thorough mixing; Again described soybean protein powder is added in the described modification coal dust in proportion, and after the homogenizer thorough mixing stirs, makes powder mix one; After perhaps thorough mixing stirs in proportion with described soybean protein powder and coal dust with homogenizer, also need add described interface modifier in proportion in the powder mix after thorough mixing stirs, and after the homogenizer thorough mixing stirs, make powder mix one;
Step 2, described powder mix one is being continued in the high-speed stirring process with described homogenizer, in described powder mix one, add polyvalent alcohol in proportion, and will make mixture one after described polyvalent alcohol and the powder mix one full and uniform mixing as softening agent;
Step 3, described mixture one is left standstill 24 ± 5h under 4 ± 2 ℃ of temperature condition, make its homogenization;
Step 4, compression molding: after adopting hot-press equipment that the mixture after leaving standstill is carried out compression molding, obtain the finished product sheet material, the pressure of its compression molding is 13～20MPa, and temperature is 130～155 ℃, and the time is 3～20min;
The stirring velocity of homogenizer described in step 1 and the step 2 is 600～1000rpm.
5. according to the preparation method of the described coal-dust-modified soybean protein plastic of claim 4, it is characterized in that: described in the step 2 in described powder mix one, add polyvalent alcohol in proportion the time, should guarantee that the temperature of described powder mix one is lower than 25 ℃.
6. according to the preparation method of claim 4 or 5 described coal-dust-modified soybean protein plastics, it is characterized in that: the stirring velocity of homogenizer described in step 1 and the step 2 is 1000rpm.
7. according to the preparation method of claim 4 or 5 described coal-dust-modified soybean protein plastics, it is characterized in that: the hot-press equipment described in the step 4 is the lithographic plate vulcanizer.
8. according to the preparation method of claim 4 or 5 described coal-dust-modified soybean protein plastics, it is characterized in that: in the compression molding process described in the step 4, earlier under 3～5MPa pressure to described mixture one preheating 4～6min after leaving standstill after, again with exert pressure to 13～20MPa and at 145～155 ℃ of following mold pressing 4～6min.
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