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Expandable microsphere drying system and method for drying by using same

A technology of drying system and expanded microspheres, which is applied in chemical instruments and methods, drying solid materials, and drying solid materials without heating, etc. It can solve the problems of high heat transfer loss, large space occupied by equipment, and long drying time, etc., to achieve Improve the reliability and simplicity of use, low cost, and easy processing

Pending Publication Date: 2020-01-21
CRERAX SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] EP0348372 discloses a process for drying expandable microspheres. The drying takes place on a conveyor belt. The process works well, but the heat transfer loss is high, the drying time is long, the efficiency is low, and the equipment takes up a lot of space, and the product is agglomerated Serious phenomenon

Method used

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  • Expandable microsphere drying system and method for drying by using same
  • Expandable microsphere drying system and method for drying by using same
  • Expandable microsphere drying system and method for drying by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] use figure 1 Shown drying system implements the method of the present embodiment, and described method comprises the steps:

[0133] (1) First, add the compound synthesized by suspension polymerization into the conical hopper 101 of the solid-liquid separation device 100 (self-made, wherein the conical hopper 101 is from Hongyu Machinery Co., Ltd., and the dehydration screw 103 is from Zhoushan Bohai Machinery Co., Ltd.). The microsphere slurry with a water content of 70% (wherein the microspheres are low-temperature microspheres), the feeding speed is 300kg / h.

[0134] In the solid-liquid separation device 100, the driving motor 104 drives the dewatering screw 103 to rotate, thereby realizing the solid-liquid separation of the slurry, wherein the liquid is removed from the water outlet 102, and the dewatering screw 103 pushes the solid (microsphere wet cake) To the feeding section 210 of the drying device 200 (from Shanghai Baodie Plastic Equipment Co., Ltd., which is...

Embodiment 2

[0142] The drying system and process flow of embodiment 2 are basically the same as embodiment 1, except the following aspects:

[0143] In step (1), the microsphere slurry (wherein the microspheres are low-temperature microspheres) with a water content of 70% synthesized by suspension polymerization is added into the conical feeding hopper, and the feeding speed is 350kg / h, and the dehydration screw The 103 revs at 300rpm.

[0144] In step (2), the processing aid from the additive adding device 300 is a liquid dispersant polyvinylpyrrolidone (Shanghai Aladdin Biochemical Technology Co., Ltd.), and the addition amount is 1Kg / h;

[0145] The rotation speed of the transverse coupling 500 connected with the drying device 200 is 80rpm.

[0146] In step (3), the temperature of the preheating section is 90°C, and the temperature of the drying section is 100°C.

[0147] The microsphere dry powder obtained in step (3) is a dry expandable microsphere powder with a density of 21 kg / m3...

experiment example 1

[0148] The water content test of experimental example 1 microsphere

[0149] Weigh each 100g of the microspheres obtained after drying in Examples 1-2, then place it in an oven at 50°C (Guangzhou Kangnuo Pharmaceutical Machinery Co., Ltd.) to continue drying the water, and weigh the mass once every hour. Until the quality of the microspheres in the beaker no longer changes. To calculate the water content, the calculation formula is as follows:

[0150]

[0151] —Moisture content of microspheres after drying

[0152] m 0 — the mass of the microspheres before being placed in the oven

[0153] m 1 —The mass of the microspheres whose mass does not change after being placed in the oven

[0154] The calculation results are shown in Table 1 below.

[0155]

[0156] It can be seen from the above experimental results that the microsphere slurries with different water contents are dried in the above manner, and the water content of the dried microspheres is between 0.38% a...

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Abstract

The invention provides an expandable microsphere drying system and a method for drying by using the same. The drying system comprises (1) a solid-liquid separation device, (2) a drying device, (3) anauxiliary adding device and (4) discharge collecting device, wherein the drying device transversely comprises a feeding section, a mixing section, an optional preheating section, a drying section, anoptional cooling section and a discharge section in sequence, wherein the feeding section, the mixing section, the optional preheating section, the drying section and the optional cooling section comprise coaxial double-screw structures; the solid-liquid separation device is arranged on the feeding section of the drying device; the auxiliary adding device is arranged on the mixing section of the drying device; and the discharge collecting device is arranged on the discharge section of the drying device. The drying system can realize continuous drying of expandable microspheres, effectively prevents bonding of the expandable microspheres in the drying process, improves the use reliability and the convenience thereof, and effectively improves the operation efficiency.

Description

technical field [0001] The invention relates to the field of chemical machinery, in particular to an expandable microsphere drying system and a drying method using the same. Background technique [0002] Microsphere is a heat-expandable thermoplastic polymer hollow sphere, which contains a heat-expandable foaming agent. Under the condition of heating, the polymer shell softens, and the foaming agent vaporizes to expand the microsphere. The preparation methods of various microspheres as well as the properties and uses of the microspheres have been described in detail in many patents (such as CN104379647A), and will not be repeated here. Cresire Technology (Shanghai) Co., Ltd. can provide microspheres with different expansion temperatures, mainly in two forms: dry powder and wet cake. The wet cake typically has a solids content of 15%-90%. [0003] Expandable microspheres are used as additives or fillers in a dry, free-flowing form where moisture must be removed for many imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B17/20F26B5/14F26B25/00B01F7/00B01F7/08B01F15/06
CPCF26B17/20F26B5/14F26B25/00B01F27/721B01F27/2322B01F35/90B01F2035/99
Inventor 刘志红刘峰高英
Owner CRERAX SCI & TECH CO LTD
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