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Method for testing high-temperature foaming process

A high-temperature foaming and high-degree technology, applied in the investigation stage/state change, etc., can solve the problems such as difficult to realize the test foaming process and evaluate the foam properties, and achieve the effect of good promotion and application prospects

Inactive Publication Date: 2015-05-20
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the foaming process at high temperature, the invention patent CN102230929A discloses a device and method for measuring the foaming performance of surfactants under high temperature and high pressure conditions. The method measures the foam height through the height scale in the observation window structure, but for those with softening point Due to the high melt viscosity and the existence of high temperature environment, it is difficult to use the above method to achieve the purpose of testing the foaming process and evaluating the foam properties

Method used

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  • Method for testing high-temperature foaming process
  • Method for testing high-temperature foaming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Put flat glass powder hollow microspheres into the transparent mold 2, ensure that the upper surface of the sample is a horizontal plane, measure the initial height h of the sample, and the initial distance H between the laser range finder 7 and the sample 0 ;

[0038] Step 2: Heat the sample from room temperature at a heating rate of 3°C / min, observe the foaming process online through the transparent observation window 3 and collect images, and measure the distance H between the laser rangefinder 7 and the sample online 1 ;H 1 After reaching the minimum value, when H 1 When the growth begins, stop heating and stop data collection, then cool the sample with the furnace;

[0039] Step 3, calculating the sample expansion rate;

[0040] Step 4, draw the expansion rate-temperature curve (see figure 2 ), and fit it;

[0041] Step 5. Calculate the first derivative of the expansion ratio-temperature curve obtained in step 4, so as to obtain the transition tempera...

Embodiment 2

[0044] Step 1. Put hollow microspheres prepared by mixing powder of glass powder (60wt.%) and kaolin (40wt.%) into transparent mold 2, ensure that the upper surface of the sample is a horizontal plane, measure the initial height h of the sample, and use a laser rangefinder 7 The starting distance H between the sample and 0 ;

[0045] Step 2: Heat the sample from room temperature at a heating rate of 3°C / min, observe the foaming process online through the transparent observation window 3 and collect images, and measure the distance H between the laser rangefinder 7 and the sample online 1 ;H 1 After reaching the minimum value, when H 1 When the growth begins, stop heating and stop data collection, then cool the sample with the furnace;

[0046] Step 3, calculating the sample expansion rate;

[0047] Step 4, drawing the expansion rate-temperature curve and fitting it;

[0048]Step 5: calculate the first derivative of the expansion rate-temperature curve obtained in step 4, ...

Embodiment 3

[0050] Step 1. Put the hollow microspheres prepared by mixing quartz glass powder (80wt.%) and alumina (20wt.%) into the transparent mold 2, ensure that the upper surface of the sample is a horizontal plane, measure the initial height h of the sample, and measure it by laser. The initial distance H between the meter 7 and the sample 0 ;

[0051] Step 2: Heat the sample from room temperature at a heating rate of 3°C / min, observe the foaming process online through the transparent observation window 3 and collect images, and measure the distance H between the laser rangefinder 7 and the sample online 1 ;H 1 After reaching the minimum value, when H 1 When the growth begins, stop heating and stop data collection, then cool the sample with the furnace;

[0052] Step 3, calculating the sample expansion rate;

[0053] Step 4, drawing the expansion rate-temperature curve and fitting it;

[0054] Step 5. Calculate the first derivative of the expansion rate-temperature curve obtaine...

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Abstract

The invention belongs to the technical field of preparation methods of foamed materials, and particularly relates to a method for testing a high-temperature foaming process. The method provided by the invention is divided into an observation part and a measurement part, wherein observation and recording in the foaming process are achieved by an image pick-up device; the height of a sample is measured on line by virtue of a laser range finder, and data are treated, so as to obtain the parameters such as transformation temperature, initial temperature, optimal working temperature, final temperature, ultimate temperature and working time of the sample. According to the method, the foaming process can be observed and recorded on line; related data of the foaming process can also be measured on line; and the non-contact measurement method is simple, convenient, feasible, safe and efficient, and has universality on a high-temperature foaming system.

Description

technical field [0001] The invention belongs to the technical field of foam material preparation methods, in particular to a method for testing a high-temperature foaming process. Background technique [0002] Foam preparation by foaming at high temperature is a common preparation method for porous materials, especially suitable for material systems with softening points. In the field of organic matter, it includes EVA foam, PE foam, PVC foam, etc.; in the field of metal materials, it includes aluminum foam, copper foam, etc.; in the field of ceramic materials, it includes foam glass, etc. In the above methods, selecting the appropriate foaming temperature and foaming time, and effectively controlling the foaming process are important means to obtain high-quality foam materials. To achieve this goal, it is very important to test the high-temperature foaming process of the material system. In addition, if the foaming process of the product can be tested online in actual prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/12
Inventor 杨金龙渠亚男席小庆苏振国许杰吴甲民李兴华
Owner TSINGHUA UNIV