The specific embodiment
The present invention is described in detail below in conjunction with drawings and Examples:
Consult Fig. 1, be first preferred embodiment of the manufacture method of bio-based macromolecule footwear material of the present invention, it comprises the following step:
Step 101 provides a mixture, and it carries out 6~15 minutes hot melt and mixing by a mixer 100 ℃~130 ℃ of temperature, to form footwear material batching.Wherein this mixer can select for use ten thousand horsepowers, profit internal mixture such as to take, and also can use the twin-screw extruder.This mixture comprises the starch ingredients of the modification of 5~50 weight portions, ethylene-vinyl acetate copolymer (EVA) component of 95~50 weight portions, the filler component of 5~30 weight portions, the polyolefin component of 0~50 weight portion, the blowing agent component of 2.0~8.0 weight portions, the blowing promotor component of 0.5~3.0 weight portion, the lubricant composition of 0.5~2.0 weight portion and the bridging agent component of 0.4~1.2 weight portion.Wherein, the gross weight after the starch ingredients of the modification in this mixture and the addition of ethylene-vinyl acetate copolymer component is 100 weight portions.
The starch ingredients of this modification is the starch material by scheduled volume, and behind hydrolysis, esterification formation esterification starch, drying is handled and made again.Wherein, this starch material is the inorganic acid solution with concentration 0.5~2.0N, from mean molecule quantity 〉=10
8The starch of larger molecular weight be hydrolyzed to average molecular weight range 10
4~10
7Hydrolyzed starch, carry out esterification with after forming esterification starch with acid anhydrides or organic acid again, last spray-dried mode is made the starch ingredients of this modification.At this, be to use acetic anhydride and hydrolyzed starch to carry out esterification, to utilize the carboxylic acid group in its molecule and the part alcohol radical effect on starch molecule surface, form the ester group structure, reach the effect of the starch of esterification modification.
Preferably, the particle diameter of the starch ingredients of formed this modification of spray-dried processing is 10~50 μ m, and its moisture content is 2~8% (w/w).
Preferably, this filler component is selected from calcium carbonate, talcum powder, magnesium carbonate, kaolin and their combination.This bridging agent component is cumyl peroxide (dicumyl peroxide abbreviates DCP as).This lubricant composition is hard ester acid.This blowing promotor component is a Zinc Oxide.
Step 102 is this footwear material batching to be made the expanded material of sheet form.Promptly this footwear material batching is after 101 steps are mixing, with a pair of scroll wheel device slice, to make several pieces expanded materials in the form of sheets.
The prepared sheet expanded material of step 102 can use for step 103 or step 104 respectively, to make multi-form footwear material finished product.
Step 103 is that the expanded material of getting sheet is made this footwear material finished product (shoe-pad) by the mode of oil pressure foaming.When making this footwear material finished product in the mode of oil pressure foaming, it is the expanded material of this footwear material batching being made sheet, after again several pieces sheet expanded material being stacked to a predetermined weight, inserting in the oil pressure platform mould of a preheating and carry out foaming to make foaming plate earlier.Wherein, described sheet expanded material is preferably 20~50 minutes the action time in this oil pressure platform mould, and the temperature of this oil pressure platform mould is set at 165 ℃~175 ℃, and its pressure is set at 160~200kg/cm
2Prepared foaming plate just can further be made the footwear material finished product of shoe-pad form again after suitably cutting.
Step 104 is that the expanded material of getting sheet is made foaming plate earlier by the mode of oil pressure foaming, uses for follow-up preparation process step, and the method for making of its foaming plate is identical with step 103, repeats no more.
Step 105 is that the prepared foaming plate of step 104 is carried out the processing and forming second time, cooperates mould therefor further to make the footwear material finished product of reservation shape, is mainly the end or the big end of footwear in the footwear according to the prepared footwear material of this process finished product.
Consult Fig. 2, be second preferred embodiment of the manufacture method of bio-based macromolecule footwear material of the present invention, its step 201 is identical with the step 101 of first preferred embodiment, so repeat no more.
Step 202 is that this footwear material batching is made granular expanded material.Mainly be that the batching that step 201 is finished is done the expanded material that granulates by a Granulation Equipments in the granulation mode, use for follow-up shot foamed moulding step.The granulation mode is identical with existing general plastic granulating mode, belongs to those skilled in the art's known technology, no longer describes in detail.
The prepared granular expanded material of step 202 can use for step 203 or 204 respectively, further to make desired footwear material finished product.
Step 203 be in the shot foamed moulding mode with the prepared granular expanded material of step 202, directly make the footwear material finished product of the end in the footwear or form of the big end of footwear.Mainly be described granular expanded material directly to be penetrated to a molding tool, be shaped to predetermined footwear material finished product by a shot foamed moulding machine.Be mainly the end or the big end of footwear in the footwear at this footwear material finished product of making.Wherein, be 6~15 minutes the action time of this forming method, and the mould temperature of mould is preferably set to 165 ℃~180 ℃, and its pressure is set at 160~200kg/cm
2
Step 204 item is in the shot foamed moulding mode the prepared granular expanded material of step 202 to be made the thick embryo in the end or the big end of footwear in the footwear earlier, further makes footwear material finished product through subsequent step again.The mould temperature of the mode of its ejection formation, action time, mould is identical with step 203 with the pressure setting, does not repeat them here.
Step 205 is the thick embryo in the end in the prepared footwear of step 204 or the big end of footwear to be inserted carry out the processing and forming second time in another mould, further to make the footwear material finished product of the end in the footwear or form of the big end of footwear.This, processing and forming was the moulded from foam moulding second time, and its mould temperature is set at 150 ℃~170 ℃, and clamp time is that 20~50 minutes and pressure are set at 100~160kg/cm
2
What deserves to be explained is, mixture comprises the polyolefin component of 0~50 weight portion in step 101 and step 201, its effect mainly is in order to reduce the proportion of final footwear material finished product, when polyolefinic content high more, the proportion of final foaming finished product is low more and have the characteristic of light weight, but relatively, also can cause the rerum natura variation of footwear material finished product, in order to make footwear material finished product keep the rerum natura that meets practical specification, its consumption should not be too high.
The present invention puts up with following concrete example and is described further, but should be appreciated that this concrete example only for illustrating use, and should not be interpreted as restriction of the invention process.
Be example with the big end of the end and footwear in shoe-pad, the footwear respectively below, six concrete examples are provided, its manufacture process is described, and carry out physical property measurement at finished product of the big end of the end and footwear in the shoe-pad of being made in view of the above, the footwear, the footwear material finished product of being made with explanation has predetermined structural strength, and can meet the rerum natura requirement of footwear material finished product.
<concrete example one 〉
Get modification starch 1000 gram, with EVA component (containing EVA 3000 grams and EVA reclaimed materials 1000 grams), polyolefin 500 grams, talcum powder 300 grams, blowing agent 133 grams, bridging agent (DCP) 25 grams, hard ester acid 60 grams and Zinc Oxide 40 grams are formulated as a mixture.Above-mentioned material is inserted small-sized profit by in the mixer behind the mix in advance, start mixer and begin to carry out 10 to 15 minutes mixing operation, treat that temperature continues to rise to about 110 ℃, and it is mixing when having carried out 6~15 minutes, can make the complete hot melt of this mixture and evenly be mixed into footwear material batching, just can be toppled over out by mixing channel this moment with this footwear material batching.Agglomerating batching placed carry out the slice program on two rollers to form the expanded material of sheet, starch-EVA the expanded material that takes by weighing the modification that has gone out sheet is to predetermined weight (capacity that cooperates the oil pressure platform mould that uses), and it is inserted in the oil pressure platform mould of preheating, be preheated to earlier about 165 ℃, at 165 ± 2 ℃ of temperature and pressure 160~200kg/cm
2Condition under act on 20~30 minutes (time length determines according to mold thickness), after making the abundant bridge formation of footwear material batching and foaming in this expanded material, open the oil pressure platform, then compression molding is the foaming plate of the starch-EVA of modification, promptly can be made into shoe-pad through suitably cutting again.Prepared shoe-pad is carried out the relevant physical property measurement of footwear material, and its result is shown in table-1.
Table-1 concrete example one prepared shoe-pad physical property measurement result
<concrete example two 〉
It mainly is the consumption that changes each composition in the mixture, just get modification starch 1250 gram, with EVA component (containing EVA 3600 grams and EVA reclaimed materials 1100 grams), polyolefin 550 grams, talcum powder 380 grams, blowing agent 160 grams, bridging agent (DCP) 36 grams, hard ester acid 72 grams and Zinc Oxide 48 grams are formulated as mixture.Method for making, preparation process condition and<concrete example one〉identical, last prepared footwear material finished product also is a shoe-pad.This shoe-pad is carried out the relevant physical property measurement of footwear material, and its result is shown in table-2.
Table-2 concrete examples two prepared shoe-pad physical property measurement results
<concrete example three 〉
It mainly is the consumption that changes each composition in this mixture, just get modification starch 1500 gram, with EVA component (containing EVA 4500 grams and EVA reclaimed materials 1200 grams), polyolefin 630 grams, talcum powder 490 grams, blowing agent 190 grams, bridging agent (DCP) 45 grams, hard ester acid 83 grams and Zinc Oxide 56 grams are formulated as mixture.Method for making, preparation process condition and<concrete example one〉identical, last prepared footwear material finished product also is a shoe-pad.This shoe-pad is carried out the relevant physical property measurement of footwear material, and its result is shown in table-3.
Table-3 concrete examples three prepared shoe-pad physical property measurement results
<concrete example four 〉
Get modification starch 1000 gram, with EVA1200 gram, polyolefin 600 grams, talcum powder 300 grams, blowing agent 80 grams, bridging agent (DCP) 20 grams, hard ester acid 17 grams and Zinc Oxide 50 grams are formulated as a mixture.Above-mentioned material is inserted small-sized profit by in the mixer behind the mix in advance, start mixer and begin to carry out 10 to 15 minutes mixing operation, treat that temperature continues to rise to about 120 ℃, mixing having carried out 6~15 minutes, can make the complete hot melt of this mixture and evenly be mixed into footwear material batching, just can be toppled over out by mixing channel this moment with this footwear material batching.Agglomerating batching placed carry out the slice program on two rollers to form the expanded material of sheet, starch-EVA the expanded material that takes by weighing the modification that has gone out sheet is to predetermined weight (capacity that cooperates the oil pressure platform mould that uses), and it is inserted in the oil pressure platform mould of preheating, be preheated to earlier about 165 ℃, at 165 ± 2 ℃ of temperature and pressure 160~200kg/cm
2Condition under act on 20~50 minutes (time length is determined by mold thickness), after making the footwear material batching bridge formation and foaming in this expanded material, open the oil pressure platform, then compression molding is the foaming plate of the starch-EVA of modification, end finished product uses in the footwear for further making, this foaming plate through thermoforming processing, just can make end finished product in the footwear again.To carrying out the relevant physical property measurement of footwear material in the end in the prepared footwear, its result is shown in table-4.
Substrate property testing result in table-4 concrete examples four prepared footwear
<concrete example five 〉
It mainly is the consumption that changes each composition in the mixture, just get modification starch 1250 gram, with EVA1400 gram, polyolefin 700 grams, talcum powder 380 grams, blowing agent 96 grams, bridging agent (DCP) 25 grams, hard ester acid 23 grams and Zinc Oxide 60 grams are formulated as this mixture.Method for making, preparation process condition and<concrete example four〉identical, last prepared footwear material finished product is the end in the footwear.To carrying out the relevant physical property measurement of footwear material in the end in these footwear, its result is shown in table-5.
Substrate property testing result in table-5 concrete examples five prepared footwear
<concrete example six 〉
It mainly is the consumption that changes each composition in this mixture, just get modification starch 1500 gram, with EVA1600 gram, polyolefin 700 grams, talcum powder 490 grams, blowing agent 102 grams, bridging agent (DCP) 32 grams, hard ester acid 30 grams and Zinc Oxide 70 grams are formulated as this mixture.Method for making, preparation process condition and<concrete example four〉identical, last prepared footwear material finished product is the big ends of footwear.To carrying out the relevant physical property measurement of footwear material in the big end of these footwear, its result is shown in table-6.
The big substrate property testing of table-6 concrete examples six prepared footwear result
Result according to aforementioned six concrete examples, can find out that first three concrete example is in order to make the shoe-pad of three kinds of different hardness, the the 4th and the 5th concrete example is to be used for making at the bottom of the footwear of two kinds of different hardness, the 6th concrete example is to be used to make the big end of footwear, testing result according to table-1~table-6, the end and the big end of footwear, have predetermined strength respectively in the footwear material finished product shoe-pad that demonstration is made, the footwear, and can both meet the rerum natura requirement of footwear material.
Wherein, in shoe-pad, the footwear end different with the big end of footwear because of its application purpose, so that its rerum natura requires is also different.Shoe-pad is because of directly contacting with wearer foot, and its flexibility is had relatively high expectations, so its hardness is lower, and in the footwear end and the big end of footwear because of must cooperating the motion of foot, so its to tension intensity, percentage elongation, tearing strength, peel off having relatively high expectations of project such as tearing strength.In addition, because of the rerum natura of shoe-pad require relatively low, so have part can use the EVA reclaimed materials in the EVA component in its mixture, to reduce cost of material.
By above explanation as can be known, the manufacture method of bio-based macromolecule footwear material of the present invention can be obtained following effect and advantage, so can reach purpose of the present invention really:
Utilize starch after hydrolysis and esterification treatment, the usefulness of the starch ingredients of the modification that is obtained, compatibility in the time of improving it and mix mutually with the EVA component, and can form stable bond, cooperate other auxiliary composition and predetermined preparation process condition, can carry out foaming processing equally smoothly, to make constitutionally stable various footwear material finished product, the footwear material of being made still can be kept light weight and soft comfortable characteristic, and the footwear material finished product of being made, the back shows that its rerum natura can meet footwear material rerum natura specification really after testing, and has practical value.Therefore, the mixture of manufacture method of the present invention by the starch ingredients that contains the predetermined ratio modification is provided be as the raw material of making the footwear material, can effectively reduce the consumption of EVA component and can reach the environmental protection purpose of carbon reduction and reduce cost of material.The footwear material finished product of being made still can keep the structural strength of being scheduled to and can meet user demand, makes the present invention not only meet the environmental protection demand, has more the characteristic and the advantage that can reduce manufacturing cost.