Self-hardening sand bonding agent for casting and preparation method and using method thereof

A technology of binder and no-bake sand, which is applied to casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems that cannot meet the requirements of large steel castings, the mold cannot be solidified as a whole, and the time required for final strength is long. , to achieve the effects of easy control of process conditions, stable sand core/mold size, and fast gas generation

Active Publication Date: 2011-08-03
NINGXIA UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the binder system has problems such as short usable time, inability to solidify the mold as a whole, and a long time to reach the final strength. It can only be used for small and medium-sized steel casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Preparation of resin:

[0018] Castor oil alcoholysis: In a reactor with agitator, add 100 parts of castor oil and 60 parts of glycerin, increase the temperature while stirring, and pass in N at the same time 2 Protect it. .

[0019] Resin synthesis: When the amount of separated water reaches 5 parts, stop heating, when the temperature in the kettle drops to 140°C, add 160 parts of high-boiling aromatic hydrocarbons, and continue stirring to room temperature to obtain alkyd resin.

[0020] Preparation of curing agent: Add 100 parts of xylene diisocyanate to 25 parts of high-boiling aromatic hydrocarbons, and mix homogeneously to form the curing agent.

[0021] The raw material purity of the above-mentioned composition resin and curing agent is industrial grade.

[0022] The use of the binder of the present invention: add 1 part of the resin prepared above to 100 parts of foundry sand, stir in the sand mixer for one minute to make it evenly mixed, and add 0.8 part to the mixed re...

Example Embodiment

[0023] Example 2-7:

[0024] The preparation method and conditions of the resin and curing agent are the same as in Example 1. The ratio of each component is shown in the table below: Data results of Example 2: The usable time is 120 minutes, the demolding time is 7 hours, the whole is cured, and the final strength is 1.88MPa.

Example Embodiment

[0025] Data results of Example 3: The usable time is 150 minutes, the demolding time is 8 hours, the whole is cured, and the final strength is 1.82MPa.

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Abstract

The invention relates to a bonding agent for casting, in particular to a self-hardening sand bonding agent for casting and a preparation method and a using method thereof. The self-hardening sand bonding agent for the casting comprises resin and a curing agent, wherein the resin consists of the following components in part by weight: 100 parts of castor oil, 40 to 90 parts of glycerol, 0.1 to 0.2part of calcium oxide, 50 to 90 parts of phthalic anhydride, 5 to 9 parts of dimethylbenzene, 120 to 200 parts of high-boiling point arylhydrocarbon; and the curing agent is prepared by mixing 100 weight parts of isocyanate and 20 to 40 weight parts of high-boiling point arylhydrocarbon. The bonding agent has readily available raw materials and is environment-friendly, equipment required by a synthetic process is simple, and a process condition is easy to control; the bonding agent has high sand mulling flowability, low gas forming amount, high gas forming speed, stable sizes of sand cores/sand molds and smooth surfaces, is convenient to store, and has the excellent effects of resisting sand burning and deformation; and the sand molds are hardened integrally and uniformly, castings have high size accuracy, and sand can be recycled, so the bonding agent is suitable for the production of large-scale steel-casting sand molds.

Description

technical field [0001] The invention relates to a casting binder, in particular to a self-hardening sand binder for casting and a preparation and use method thereof. Background technique [0002] One of the main methods of the foundry industry for the preparation of metal parts is sand casting, in which disposable patterns are made by mixing, shaping and curing sand with an inorganic or organic binder, which is Used to reinforce molds and cores. The two main methods used to prepare molds and cores are (1) the cold box core method and (2) the no-bake method. Most cold box coremaking methods are based on polyurethane forming binders. See eg US 3,409,579 and 3,676,392. These systems are cured with gaseous quaternary amine catalysts. The polyurethane forming binder system typically consists of a phenolic resin component and a polyisocyanate component which are mixed with sand and cured to form a cured mix prior to compaction. The component phenolic resin in the binder syste...

Claims

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Application Information

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IPC IPC(8): B22C1/22C08G18/68
Inventor 周惠良胡奇林
Owner NINGXIA UNIVERSITY
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