Fluoride-free exothermic insulating riser and preparation method thereof

A thermal insulation riser, fluorine-free technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of insufficient heating of the riser, easy pollution of recycled sand, shrinkage and casting defects, etc., and achieve good heating effect , short production cycle, reduce shrinkage cavity and porosity effect

Inactive Publication Date: 2014-02-19
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problems of insufficient heat generation, poor heat preservation effect, shrinkage cavity, shrinkage porosity and casting defects of the existing riser, easy pollution of recycled sand, long molding, long production cycle and high cost, thereby providing a non-toxic Fluorine heating insulation riser and preparation method thereof

Method used

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Effect test

specific Embodiment approach 1

[0015] Specific embodiment one: A kind of fluorine-free heat preservation riser in this embodiment is composed of 20~28 parts of expanded perlite, 10~25 parts of quartz sand, 18~25 parts of aluminum powder, 4~6 parts by weight. 18-25 parts of magnesium powder, 18-25 parts of iron oxide powder, 2-4 parts of potassium nitrate, 3-5 parts of sodium chloride, 2-3 parts of basic phenolic resin, 0.6-1.0 parts of organic ester and 0.02 parts ~0.03 parts of coupling agent.

[0016] This embodiment has the following advantages:

[0017] 1. Sodium chloride is used to replace fluorine salt in the riser prepared by this embodiment, which avoids the defects of fish eyes and easy pollution of recycled sand in ductile iron due to the accumulation of fluorine;

[0018] 2. The tensile strength of the riser prepared by this embodiment is higher than 1.2MPa 24 hours after demoulding, and the tensile strength after 15 days is still higher than 1.1MPa, which fully meets the production requirements...

specific Embodiment approach 2

[0020] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the fluorine-free heat preservation riser is composed of 22 to 26 parts of expanded perlite, 15 to 20 parts of quartz sand, 20 to 22 parts of Aluminum powder, 4-6 parts of magnesium powder, 20-22 parts of iron oxide powder, 2-3 parts of potassium nitrate, 3-4 parts of sodium chloride, 2-3 parts of alkaline phenolic resin, 0.6-0.8 It is made of organic ester and 0.02-0.03 part of coupling agent. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the particle size of expanded perlite is 50 mesh to 70 mesh; The mud content of scrubbing sand with mesh ~ 140 mesh is less than 0.5%; the purity of aluminum powder is greater than 98%, and the particle size is 100 mesh to 200 mesh; the purity of iron oxide powder is greater than 95%, and the particle size is 100 mesh to 200 mesh; The pH value of the resin is 12-14, the mass fraction of free aldehydes is less than 0.2%, and the mass fraction of free phenols is less than 0.5%; the organic ester is glycerol acetate, and the purity of glycerol acetate is greater than 98%; the coupling agent is silane coupling Joint agent KH-550. Others are the same as those in the first or second embodiment.

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Abstract

The invention provides a fluoride-free exothermic insulating riser and a preparation method thereof and relates to an insulating riser and a preparation method thereof. The objective of the invention is to overcome the technical problems of insufficient heating, a poor insulating effect, occurrence of shrinkage cavities, the casting defect of shrinkage porosity, easy contamination of reused sand, long molding and production periods and high cost of conventional risers. The fluoride-free exothermic insulating riser is prepared from expanded perlite, quartz sand, aluminum powder, magnesium powder, iron oxide powder, potassium nitrate, sodium chloride, an alkaline phenolic resin, organic ester and a coupling agent. The preparation method comprises the following steps: 1, weighing raw materials; 2, preparing a mixed blank material; and 3, preparing the fluoride-free exothermic insulating riser. The riser provided by the invention is applied to preparation of nodular cast iron.

Description

technical field [0001] The invention relates to a thermal insulation riser and a preparation method thereof. Background technique [0002] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Liquid shrinkage and solidification shrinkage are two processes that must be experienced during the cooling process of ductile iron. In these two processes, if they are not compensated in time, casting defects such as shrinkage cavities and shrinkage porosity will often be caused, resulting in castings being scrapped. The riser is one of the effective means to solve this kind of casting defects, and is widely used. However, with the continuous improvement of casting quality requirements, the existing heating riser, heat preservation riser or heat preservation riser is difficult to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08B22C1/00B22C1/02B22C1/22
Inventor 石德全高桂丽王常玖
Owner HARBIN UNIV OF SCI & TECH
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