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Method for determining SEBS content in polypropylene blending material

A determination method and polypropylene technology, which are applied in the direction of analyzing materials, material analysis by optical means, measuring devices, etc., can solve the problems of inaccurate detection of SEBS content and large thickness measurement errors, so as to facilitate the determination process and improve the accuracy. , the effect of improving accuracy and precision

Pending Publication Date: 2022-07-12
ANHUI DOUBLE CRANE PHARMA
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Problems solved by technology

However, when the soft plastic is thinner, the thickness measurement error is larger, resulting in inaccurate SEBS content detection

Method used

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  • Method for determining SEBS content in polypropylene blending material
  • Method for determining SEBS content in polypropylene blending material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] PP and SEBS were blended and granulated at a ratio of 98:2 to obtain a control sample with a SEBS content of 2%.

[0039] PP and SEBS were blended and granulated at a ratio of 95:5 to obtain a control sample with a SEBS content of 5%.

[0040] PP and SEBS were blended and granulated at a ratio of 90:10 to obtain a control sample with a SEBS content of 10%.

[0041] PP and SEBS were blended and granulated at a ratio of 85:15 to obtain a control sample with a SEBS content of 15%.

[0042] PP and SEBS were blended and granulated at a ratio of 80:20 to obtain a control sample with a SEBS content of 20%.

[0043] Take control samples with SEBS content of 2%, 5%, 10%, 15%, and 20% to scan the infrared spectrum, and record the absorbance AP at a wavenumber of about 973-1 (polypropylene characteristic) in each control sample, and the wavenumber Absorbance AS of about 699-1 (characteristic of the benzene ring). by formula The K value was calculated and verified, and the lin...

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Abstract

The technical problem to be solved by the invention is to determine the SEBS content in the polypropylene-SEBS blended material, and provides a rapid, convenient and effective determination method and formula. The complex process of an existing external standard method is broken through, the sample to be measured does not need to be made into a membrane, the thickness of the sample does not need to be measured, and inaccuracy of SEBS content measurement caused by thickness measurement errors is avoided. The method comprises the following contents: research of a determination principle, design of a test scheme, calculation of a linear constant K of a blending system, establishment of a determination method, verification of specificity of the method, verification of accuracy and precision, confirmation of a linear relationship, and practical application of the determination method. The method has the advantages that 1, the relationship between the characteristic wave number absorbance and the component content is scientifically researched on the basis of the Lambert-Beer law; 2, analyzing the specificity and the linear relation by using an infrared spectrogram scanned by a control sample with known content; and 3, the accuracy and precision of the determination method are verified by using the blended granules with the known SEBS content. 4, in a certain PP-SEBS system, K is a constant, and repeated calculation is not needed. 5, the determination method is not influenced by the thickness of the sample, an ATR method can be adopted, and the determination process is convenient and rapid. And 6, the application range of the determination method is wide.

Description

technical field [0001] The invention belongs to the field of large infusion medicine packaging, and particularly relates to a quantitative detection technology for SEBS content in polypropylene blend materials. Background technique [0002] Infusion containers have been widely used in flexible plastic packaging, polypropylene blends have become the mainstream of the market, the base material is polypropylene, and a small amount of SEBS is added to improve the toughness and impact resistance of the packaging. The addition ratio and mixing uniformity of SEBS affect the quality and performance of the packaging material. For example, the small content of SEBS in the bag body may cause embrittlement during storage or transportation, resulting in liquid leakage. The content of SEBS must conform to the standard range approved by registration, and the content of SEBS needs to be tested and controlled. [0003] At present, the content of SEBS is detected by Fourier transform infrare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
CPCG01N21/3563G01N2021/3572
Inventor 曹志敏施小娟周健
Owner ANHUI DOUBLE CRANE PHARMA
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