CN104550649A

CN104550649A - Nano-scale adhesive for casting mold/core sand

Info

Publication number: CN104550649A
Application number: CN201310494086.3A
Authority: CN
Inventors: 于永健
Original assignee: Qingdao Wuyang Casting Machine Co Ltd
Current assignee: Qingdao Wuyang Casting Machine Co Ltd
Priority date: 2013-10-21
Filing date: 2013-10-21
Publication date: 2015-04-29

Abstract

The invention discloses a nano-scale adhesive for casting mold/core sand. The adhesive consists of phenol, aldehyde, clay, a base catalyst and a silane coupling component. The phenol is put into a reaction kettle, is stirred and is heated; activated solid base metal acetate is added at the temperature of 55+/-2 DEG C to trigger the condensation reaction of the phenol and the aldehyde, and a larger number of active reaction points are formed; the phenol and the aldehyde are further poly-condensed by using the base catalyst; meanwhile, the clay is subjected to resin intercalation and nano dispersion, and therefore active thermosetting phenolic resin which is lower in molecular weight and higher in hydroxymethyl content is obtained; the phenolic resin is used for preparing a complex ester curing agent for casting resin sand. The nano-scale adhesive for the casting mold/core sand has the advantages that the activity of the resin is high, the preparation efficiency of a sand mold/core from the resin is high, the quality of the sand mold/core is good, the sand mold/core can be used for a long time, the quality of a casting is good, and a using site is free from an extraneous odor; the adhesive is particularly suitable for casting a super-huge type casting, and the economic benefit of an enterprise can be greatly improved.

Description

Nanoscale cast moulding (core) sand binding agent

Technical field

The invention belongs to casting technology field, be specifically related to a kind of cast moulding (core) sand binding agent.

Background technology

In recent years, thermosetting phenolic resin, that particularly obtain using base catalyst, under strongly basic medium exists liquid alkaline phenolic resins obtains more application as type (core) sandbinder at foundry industry, develop very fast, but existing product exists some shortcomings: one is that the tensile strength of these binding agents alkalescent phenol resin used is too low, particularly at low temperatures (as 10 ⁰below C) sand mold (core) that makes, intensity can not meet the needs of production; After the two resin sand placement long periods being preparation, intensity declines, and can not meet need of production; Three is poor stabilities of resin, and the shelf-life is shorter; Four is bad in sand mold (core) surface stability of making in summer, the defect such as sand washing, inner burning into sand when easily causing foundry goods to cast.

Summary of the invention

In order to overcome the above-mentioned technical problem that prior art field exists, the object of the invention is to, there is provided a kind of nanoscale cast moulding (core) sand binding agent, the phenol resin active of binding agent is high, is peeled off as nano-scale dispersion resin in the phenolic resins of clay flake by intercalation; Binder Properties is stablized, and has no adverse effects to foundry goods, on-the-spot free from extraneous odour.

Nanoscale cast moulding (core) sand binding agent provided by the invention, proportioning is by weight percentage: phenol 16 ~ 30%, aldehyde 40 ~ 55%, clay 0.5 ~ 10%, base catalyst 15 ~ 30%, silane coupler 0.01 ~ 2%, alkali metal acetate 0.5 ~ 10%.Optimum ratio is: phenol 21 ~ 25%, aldehyde 49 ~ 52%, clay 0.5 ~ 3%, base catalyst 20 ~ 25%, silane coupler 0.01 ~ 0.3%, and alkali metal acetate 0.8 ~ 3%(is more preferred from 0.8 ~ 1%).

Described phenol is phenol, mixture to (or) cresols, (or to) benzenediol, bisphenol-A, bisphenol-f phenolic compound wherein one or more, is preferably phenol.

Described aldehyde is formaldehyde, paraformaldehyde, glyoxal, acetal, furtural wherein one or more mixture, preferably formaldehyde.

Described base catalyst is alkali metal hydroxide, can be wherein one or more mixture, preferably potassium hydroxide.

Described clay is layer silicate mineral, and comprise the montmorillonite of content more than 80%, bentonite, hectorite, tired de-stone, granularity is narrower than 200 orders, preferably 150 orders.

Nanoscale cast moulding (core) sand binding agent provided by the invention, its beneficial effect is, resin activity is high, make sand mold (core) with this resin, operating efficiency is high, and the quality of sand mold (core) is good, up time is long, and the matter of foundry goods is good, uses on-the-spot free from extraneous odour; Especially be applicable to casting Huge casting, the economic benefit of enterprise can be increased substantially.

Detailed description of the invention

Below in conjunction with an embodiment, nanoscale cast moulding (core) sand binding agent provided by the invention is described in detail.

Embodiment

Nanoscale cast moulding (core) the sand binding agent of the present embodiment, its formula is: phenol 25%, formaldehyde 50%, 150 order clays 0.5%, potassium hydroxide 23%, silane coupler 0.5%, alkali metal acetate 1%.

Claims

1. nanoscale cast moulding (core) sand binding agent, is characterized in that: proportioning is by weight percentage: phenol 16 ~ 30%, aldehyde 40 ~ 55%, clay 0.5 ~ 10%, base catalyst 15 ~ 30%, silane coupler 0.01 ~ 2%, alkali metal acetate 0.5 ~ 10%.

2. nanoscale cast moulding (core) sand binding agent according to claim 1, it is characterized in that: proportioning is by weight percentage: optimum ratio is: phenol 21 ~ 25%, aldehyde 49 ~ 52%, clay 0.5 ~ 3%, base catalyst 20 ~ 25%, silane coupler 0.01 ~ 0.3%, alkali metal acetate 0.8 ~ 3%(is more preferred from 0.8 ~ 1%); Described phenol is phenol, mixture to (or) cresols, (or to) benzenediol, bisphenol-A, bisphenol-f phenolic compound wherein one or more; Described aldehyde is formaldehyde, paraformaldehyde, glyoxal, acetal, furtural wherein one or more mixture; Described base catalyst is alkali metal hydroxide, can be wherein one or more mixture; Described clay is layer silicate mineral, and comprise the montmorillonite of content more than 80%, bentonite, hectorite, tired de-stone, granularity is narrower than 200 orders.