Method of shaping profiled articles from starch-base composition

专利摘要:
The invention refers to a process of forming shaped articles from starch, which process comprises: (a) heating a composition comprising a pre-processed and essentially destructurized starch/water material, at a water content in the range of from 10 to 20 % by weight based on the weight of the composition to a temperature sufficient to essentially destructure the starch. (b) transferring the melt to a mold while maintaining said water content and (c) cooling the melt in the mold to a temperature below its glass transition temperature to form a solid shaped article and articles made by this process.
公开号:SU1612999A3
申请号:SU4356200
申请日:1988-08-10
公开日:1990-12-07
发明作者:Фредерик Томас Степто Роберт；Томка Иван；Тома Маркус
申请人:Варнер Ламберт Компани (Фирма)；
IPC主号:

专利说明:

The invention relates to the processing of starch into shaped articles, such as bottles, sheets, films, packaging materials, tubes, rods, pharmaceutical capsules, and the like.
The aim of the invention is to improve the physicomechanical characteristics of the products.
Figures 1-5 are diagrams explaining the proposed method. i Example
1 A. Preparation of degraded starch.
Natural potato starch, lubricant / release agent; I form lubricant (hydrogenated; fat) and melt flow enhancer. mixed with each other in relative fir-tree proportions and mixer for powder materials for 10 minutes
so that a composition is obtained consisting of 81.3 parts of a natural carp: tofel starch, 1 part of a hydrogenated triglyceride containing C4g: Cg: C4 fatty acids at a ratio of 65: 31: 4 mach. ., 0.7 ch. Lycene and 17 h, water, having the form of a free-flowing powder. This product is then fed to the feed hopper. extruder. In a screw cylinder, this powder melts. The measured cylinder temperature is 165 seconds, the average total residence time is 12 minutes (10 minutes of heating, 2 minutes of sticks in the molten state) and the pressure generated is equal to the vapor pressure of the liquid present in the volume of the auger cylinder. This melt is then pressed and divided into grains with an average diameter from 2 to. 3 mm. This material is
about: y
with
g with

cm
It is a solid, hard product with a fine foamy structure. Its water content is 12%, and this water can evaporate when the melt leaves the extruder muzzle. The resulting particulate material is then conditioned to a water content of 17%.
B. Injection molding of the obtained grains. The resulting material is fed to the feed hopper of the injection molding machine. This material is melted in a screw cylinder. The temperature in it is maintained at 165 ° C, the pressure TZx. the average residence time is 7.5 minutes (5 minutes of heating and 2.5 minutes in the molten state). The melt is injected into an extrusion mold in such a way that test specimens are obtained that are suitable for studying their physical properties (load / deformation behavior) in a tensile test apparatus. These samples were conditioned to a water content of 13.5% and tested at room temperature at a stretching rate of -10 mm / min.
Chart load - strain
(Fig. 1) for the material according to Example 1A was obtained with the following conditions:
vih: stay time 450 s; screw rotation speed f 75 rpm; deformation at break 32,5f2,0%; bursting
load 40,, 1 Sha;. energy developed
dug / unit of 450.01-30.1 kJ-m.
The load-deformation diagram P (Fig. 2) for additional material according to example 1 (test samples conform to the standard) was obtained under the following conditions: load / deformation of starch treated as described in example 1B; residence time 450 s; screw speed 125 rpm; deformation at break 29.44-2.0%; breaking load 39.3 + 0.3 MPa; bursting energy / unit area, 6 kJ-m.
- -, -.
Each group shows a result; You can measure three samples of injection molded under the same conditions as described in Example 1B using pretreated (destructured) starch, as described in Example 1A. The subjects. the samples are well reproducible in terms of duality, and the degree of their stretching up to the moment i of rupture is approximately 30%.
Other processing conditions, such as residence time j in injection molding equipment 600 s, screw auger rotation speed of 75 rpm, give similar results.
Example 2. The composition as in Example 1A is fed to the injection hopper of the injection machine. pressing, test samples are obtained directly in a one-step process. The temperature in the screw cylinder is 165 ° C, the pressure is 75x105 N / m, the residence time in it is 12.5 minutes (8 minutes of heating, 4.5 minutes in the molten state).
The load-strain diagram (Fig. 3) for the material according to Example 2 was obtained according to the following conditions: a residence time of 750 s; screw speed 75 rpm; deformation at break 18.0 ± 4.7%; breaking load 33.8 ± 7.7 MPa, rupture energy / unit area 242 ± 68 kJ-m
The load-strain diagram (Fig. 4) for another material according to Example 2 was obtained under the following conditions: a residence time of 750 s; auger rotation speed of 100 rpm; deformation at break 8.8f3.1%; breaking load 33.8 ± 7.7 MPa; rupture energy / unit area 108J-44 kJ-m
The degree of stretch reached until the moment of rupture is relatively low, non-permanent and well below the values corresponding to example 1.
PRI me R 3. The procedure is carried out similarly to Examples 1 and 2, but the composition of Example 1A is similar and replaced by a composition consisting of the following components, wt.h .: Natural potato starch 80.0 Ointment / release agent forms (hydrogenated fat) lecithin o 7 Titanium dioxide 0.3 Water 17.0 Results similar to the results of examples 1 and 2 were obtained.
EXAMPLE 4. The procedure is carried out in the same manner as described in
but in examples 1 and 2 using a composition containing polyvinylpyrrolidone and the test samples obtained have the following composition,%: Potato
starch74,6
Polyvinylpyrrolidone 10.0
Hydrogenated fat1,1
Lecithin0,8
Water13,5
The behavior of the load / deformation is similar to the behavior in the implementation of processing in example 1 and similar to the behavior in the implementation of processing in example 2,
PRI me R 5 (stability of processing). The viscosity of the composites described in Example 1A in the molten state in a screw cylinder is measured as a function of shear rate during processing (curve 1, figure 5). As in example 1B and in processing (curve 2, Fig. 5) as in example 2. The test results are obtained in a machine with well-adjusted conditions. Melt viscosity as a function of shear rate is calculated from measurement data using standard injection molding theory along with filling time measurements, showing the results of a two-stage process according to Example 1, as well as the results of a one-stage process according to Example 2. Materials processed according to Example 2 (one-step process), have higher melt viscosities and a higher sensitivity to residence time in the treatment zone and shear rates. These higher viscosities and sensitivities result in lower processing stability and lower reproducibility of the product.
Dependence of the melt viscosity on; The shear rates during the two-step process according to Example 1 are similar to those of conventional thermoplastics, for example polyethylene, which are known to undergo stable processing, producing reproducible products.
9996
logC ITa-c) means logarithm with base 10 of the melt viscosity 9 5log () means logarithm with base 10 of the magnitude of the shear rate (figure 5). Lines 1-3 were obtained for the material according to Example 2 (one-step process) with residence times of 750, 600 and 450 s, respectively.
Lines 4 and 5 are obtained for the material according to example 1 (a two-step process) with a residence time of 750 and 450 s, respectively.
 I.
, EXAMPLE 6. Examples 1 and 2 are repeated.
however, the original composition in example 1A is replaced by the following components, including: Natural potato starch 77.0 2Q Sizing / an-, thiadhesive (hydrogenated fat). Lecithin Titanium Dioxide 0.3 25 Water, 20.0
Similar results were obtained, as in Examples 1 and 2.
Example 7. Examples 1 and 2 are repeated using a composition containing polyvinylpyrrolidone, so that the following composition is obtained,%: Potato starch76.0
Polyvinylpyropion 12,0
Hydrogenated Fat1,2
Lecithin0,8
35 Water10.0
The torque characteristic is similar to that when the treatment is carried out as in Examples 1 and 2.
40

权利要求:
Claims (1)
[1]
Invention Formula
The method of forming profiled products from starch-based compositions containing 10-20 wt.% Water, including heating the compositions to obtain a melt and injection molding in a form that differs from and in order to improve the physicomechanical product characteristics, prior to injection molding, the melt is extruded with ncuiy grains, which are conditioned to a specified moisture content and melted.
N
(
1 1.05 1.1 1.15. 1.2 1.25 1.3 1.35, i
4e0o / 0 / fa 4 A / f / xzxflfa / af Ul. f
M
tvy
1.05 1.1 1.15 1.2 1.25 1.3 1.35 1/1
 / xtjc a a
rig.2
.
About 1
Fig.Z
log)

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法律状态:
2005-05-10| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20030811 |

优先权:

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申请号 | 申请日 | 专利标题

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GB8719485A|GB2208651B|1987-08-18|1987-08-18|Shaped articles made from pre-processed starch|

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