Slurry extruding method of disposable tableware produced by magnesia oxychloride cement

A magnesium oxychloride cement, a disposable technology, is applied in the field of pulping and extrusion of magnesium oxychloride cement disposable tableware, which can solve the problem of short initial setting time of magnesium oxychloride cement, high slurry viscosity, affecting the strength and durability of disposable tableware. Appearance and other problems, to achieve the effect of controllable extrusion slurry time and simple extrusion slurry process

Inactive Publication Date: 2008-03-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the short initial setting time of magnesium oxychloride cement and the high viscosity of the slurry, it is difficult to remove the air bubbles in the slurry, which seriously affects the strength and appearance of the magnesium oxychloride cement disposable tableware after the slurry is solidified. At the same time, the extrusion of the slurry also become difficult

Method used

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  • Slurry extruding method of disposable tableware produced by magnesia oxychloride cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using its own weight, the magnesium oxychloride cement slurry can also be boosted to 0.5MPa with a slurry pump, squeezed into a cavity through a slit with a diameter of 10mm, and vacuumed from the top of the cavity with a vacuum degree of 0.08MPa. A screw pump is installed at the bottom of the body, and the magnesium oxychloride cement slurry in the vacuum chamber is extruded through the screw pump. A three-way valve is installed at the extrusion port of the screw pump, and the extrusion time of the magnesium oxychloride cement slurry is controlled by controlling the three-way valve. , when there is no need for the slurry to be extruded from the extrusion port, the slurry will flow back to the slurry inlet of the cavity through the three-way valve.

Embodiment 2

[0016] The magnesium oxychloride cement slurry can also be boosted to 10MPa with a slurry pump by its own weight, and squeezed into a cavity through a disc with a small hole. The diameter of the small hole is 5mm, and the number of small holes on the disc is 10, vacuumize from the top of the cavity, the vacuum degree is 0.04MPa, and a screw pump is installed at the bottom, through which the magnesium oxychloride cement slurry in the vacuum cavity is extruded, and a three-way valve is installed at the outlet of the screw pump , by controlling the three-way valve to control the extrusion time of the magnesium oxychloride cement slurry, when there is no need for the slurry to be extruded from the extrusion port, the slurry can flow back to the slurry inlet of the cavity through the three-way valve.

Embodiment 3

[0018] Using its own weight, the magnesium oxychloride cement slurry can also be boosted to 1MPa with a slurry pump, and squeezed into a cavity through a disc with small holes. The diameter of the small hole is 1mm, and the number of small holes on the disc is 20. One, vacuumize from the top of the cavity, the vacuum degree is 0.09MPa, a screw pump is installed at the bottom, and the magnesium oxychloride cement slurry in the vacuum cavity is extruded through the screw pump, and a three-way valve is installed at the outlet of the screw pump. By controlling the three-way valve to control the extrusion time of the magnesium oxychloride cement slurry, when there is no need for the slurry to be extruded from the extrusion port, the slurry can flow back to the slurry inlet of the cavity through the three-way valve.

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Abstract

The present invention relates to process of mixing and extruding magnesium oxychloride cement slurry for producing disposable tableware. The process includes raising the pressure of magnesium oxychloride cement slurry to 0.5-10 MPa, extruding the slurry through one disc with one slit or small hole into one cavity, vacuumizing the cavity from the top to 0.1-0.04 MPa, extruding magnesium oxychloride cement slurry out of the cavity with one screw pump mounted in the bottom of the cavity and controlling the extruded slurry amount with one three-way valve in the outlet of the screw pump. The present invention has simple slurry extruding process, controllable extrusion time, no bubble in the extruded slurry and other advantages.

Description

technical field [0001] The invention relates to a pulp refining and extrusion method of magnesium oxychloride cement disposable tableware. Background technique [0002] Magnesium oxychloride cement is an air-hardening cementitious material. It uses activated magnesium oxide as a raw material, magnesium chloride solution as a blending agent, and supplemented with admixtures. and surfactants. The preparation steps of magnesium oxychloride cement slurry for making disposable tableware are as follows: [0003] (1) Preparation of powder: Grinding active magnesium oxide or active magnesium oxide and additives into powder, active magnesium oxide accounts for 10-100% of the powder content; the balance is additives, and additives are reinforcing agents, Any one or a mixture of two or more of fillers, water-resistant agents, bactericides, and surfactants; [0004] (2) Get magnesium chloride hexahydrate by the amount of magnesium oxide in the powder and the mol ratio of magnesium ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/22
Inventor 张勇肖丹
Owner WUHAN INSTITUTE OF TECHNOLOGY
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