High temperature gel chromatograph for GPC-QC fast and efficient quality control

GPC-QC is a compact high temperature GPC instrument designed for quality control in polyolefin production lines. The instrument is built on the latest quality control platform, the method is simple and reliable, and can provide accurate molecular weight distribution information for process control. Therefore, adding a complete curve for conventional process control in the production plant can meet the needs of industrial production.

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Classification:

Quality control instruments

Characterization of analytical instruments

Key words:

Product optimization

Detailed introduction:

Introduction of high temperature gel chromatograph GPC-QC for fast and efficient quality control

1. GPC-QC functions and features

1. Desktop, fully automatic analysis;

2. Reliable single sample dissolution system;

3. 30 minutes to complete the analysis of a sample (including dissolution time);

4. Built-in IR4 or IR5 detector for concentration analysis and short chain branch analysis;

5. Optional dual capillary viscometer;

6. Specially used for quality control environment, the design is simple and reliable;

7. At the same time, the molecular weight and its distribution information, short chain branch information and intrinsic viscosity are given;

8. The results were reproducible.

2. GPC-QC Application Fields

1. Pilot plant

2. Trial start-up of factory products

3. Monitor the level change of the multi-stage reaction process

4. Monitoring the microstructure of tubular resins

5. Central control laboratory

3. Application Example

MMD characterization of three UHMWPE samples was performed by GPC-QC. Each sample is injected twice. Figure 1 below is the IR5 raw signal of the three samples. We can see that the baseline is stable and the repeatability is good:

1 IR5 raw signals of three samples

Figure 2 MMD overlay of three UHMWPE samples

Figure 3 Analysis results of three UHMWPE samples

From the analysis results in fig. 3, we can see that the MW of the three samples are about 6.9 million, 2.98 million and 3.95 million respectively. GPC-QC instrument adopts IR5 selective detector which only responds to the infrared absorption of C- H characteristics. the sensitivity is extremely high and can meet the concentration test of extremely dilute solution. the concentration of the three samples is only 0.125 mg/mL, and the signal-to-noise ratio reaches 60. the signal-to-noise ratio is so high, then the test of lower dilute solution can also be expected; At the same time, a special fast GPC column (the pore diameter of gel particles is larger) is configured to solve the problem of column blockage caused by excessive viscosity of UHMWPE sample to a certain extent. Only the sample is weighed manually, and the remaining process is automatically completed by the instrument, and the MMD characterization of the sample can be completed within one hour. This is the latest technology to date for the characterization of UHMWPE molecular weight and its distribution.

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