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Process for preparing compositions based on a starchy component and on a synthetic polymer

A technique for synthesizing polymers, compositions, applied in the field of preparation of compositions based on starch components and synthetic polymers

Inactive Publication Date: 2014-08-06
ROQUETTE FRERES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method described in this patent therefore has the same disadvantages as the method previously developed by the applicant, namely that prolonged exposure of a preplasticized starch composition to the plasticized starch material is prone to thermal degradation and / or Substantial coloring at elevated temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0243] Example 1: Preparation of compositions starting from a thermoplastic starch according to a method of the prior art

[0244] The following are used in this example:

[0245] - as starch component (component 2), a native wheat starch sold by the applicant under the name "Amidon de blé SP", having a moisture content in the range of 12%,

[0246] - as plasticizer (component 3), by the applicant in A concentrated aqueous composition of polyols based on glycerol and sorbitol sold under G 84 / 41 / 00, having a water content of about 16%.

[0247] Starting from these two products a thermoplastic starch (TPS) composition was prepared according to the prior art. To do this, wheat starch and plasticizer were fed into a TSA brand twin-screw extruder with a diameter of 26 mm (D) and a length of 50D, in order to obtain a total material throughput of 15 kg / h, which The plasticizer / wheat starch ratio was set at 67 parts / 100 parts (composition AP6040).

[0248] The extrusion condition...

example 2

[0292] Example 2: Preparation of various compositions according to the invention

[0293] In the context of this example, the same extrusion equipment as described in Example 1 and the same extrusion conditions as in Example 1 for the preparation of the blend were used according to the invention, and in particular the following temperature profile (in °C for each of the ten heating zones Z1 to Z10): 200 / 120 / 140 / 140 / 160 / 170 / 160 / 150 / 160 / 160.

[0294] The products used were identical in nature and proportions to those used for the corresponding production of Blends 1 and 2 described in Example 1.

[0295] In the present case, however, a thermoplastic starch was not pre-prepared, but within the meaning of the invention, the unplasticized starch component (component 2) and its plasticizer (component 3) and Also optionally the linker is introduced separately into an extruder already containing the polymer blend (component 1 ) in a molten form.

[0296] According to a first variant...

example 3

[0321] Example 3: Preparation of a composition from a thermoplastic starch according to a method of the prior art

[0322] Starting from the thermoplastic starch previously described in Example 1, a blend 3 was prepared containing 50% by total weight of a synthetic polymer formed from a commercial polyamide (component 1) , the blend has the following mechanical characteristics:

[0323] - Elongation at break: >300%

[0324] - Maximum ultimate stress: >60MPa.

[0325] Extrusion conditions are as given below.

[0326] - dry blending the polyamide (50% by weight) and the thermoplastic starch (50% by weight) in the main hopper

[0327] -Screw speed: 400rpm

[0328] - Temperature profiles (in °C for each of the ten heating zones Z1 to Z10): 230 / 100 / 100 / 140 / 140 / 140 / 160 / 190 / 190 / 200.

[0329] Blend 3 thus obtained had a tan-brown colouration.

[0330] The mechanical characteristics obtained for this blend 3 obtained according to the prior art are as follows:

[0331] - Elongati...

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Abstract

A subject of the invention is a process for the preparation of compositions based on synthetic polymers, which process comprises: introducing an unplasticized starch component into a reactor containing softened or molten synthetic polymer (component 1) (component 2) and the latter a plasticizer (component 3); The kneading is carried out under conditions of plasticization and a homogeneous mixture of the synthetic polymer and the plasticized starch component. The reactor may especially be a co-rotating or counter-rotating single-screw or twin-screw extruder, for example a co-rotating twin-screw extruder. The synthetic polymer may advantageously be selected from the group comprising: polyethylenes (PE) and polypropylenes (PP), which are functionalized or not; polyamides (PA), thermoplastic polyurethanes (TPU), styrene-ethylene-butylene-styrene (SEBS) copolymer, preferably functionalized; amorphous polyethylene terephthalate (PETG), and mixtures thereof. The resulting compositions have various improved characteristics, especially in terms of coloring and mechanical properties, such as elongation at break.

Description

technical field [0001] The present invention relates to a novel process for the preparation of compositions based on a synthetic polymer and on a starch component, and also to the compositions obtained by this process. Background technique [0002] The practice of incorporating granular starch as a filler into plastics such as polyethylene has been known for decades. Prior to dispersing the starch in the synthetic polymer, the native granular starch is generally dried to a moisture content of less than 1% by weight in order to reduce its hydrophilic nature, thereby assisting incorporation into the polymer formed by the polymer. in a continuous matrix and stabilize the resulting dispersion. For the same purpose, the starch is also precoated with fatty substances (fatty acids, silicones, or silicon alkoxides) or on the surface of these granules by using hydrophobic groups (such as siloxanes) or Reactive groups (such as isocyanates) are grafted for modification. The material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02
CPCC08J3/18C08J2303/02C08L51/06C08L23/12C08L3/02C08J2323/02C08L2205/03C08L2666/02
Inventor 蒂埃里·费龙勒内·圣卢普热罗姆·吉梅内斯迪迪埃·拉尼奥亨利·索泰尔
Owner ROQUETTE FRERES SA
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