CN1035864C

CN1035864C - Binder for sand mould and its mfg. method

Info

Publication number: CN1035864C
Application number: CN94110265A
Authority: CN
Inventors: 张炳春
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-05-07
Filing date: 1994-05-07
Publication date: 1997-09-17
Anticipated expiration: 2014-05-07
Also published as: CN1098970A

Abstract

The present invention relates to a binder for casting sand moulds. Castor bean waste slag remaining after the distillation in the production of sebacic acid is used as the principal raw material; the castor bean waste slag reacts with asphalt at the temperature of 160 to 170 DEG C, and reaction products are matched with sodium carbonate, kerosene and sweat oil so as to form the binder for casting sand moulds. All indexes of the binder for casting sand moulds achieve the standard in China, and the dry tensile strength is obviously higher than the index of the standard in China. The binder for casting sand moulds can be used for manufacturing grade-one oil sand moulds, grade-two oil sand moulds and grade-three oil sand moulds.

Description

Binder for sand mould and its mfg. method

The present invention relates to the manufacture method of the binding agent that casting sand type uses.

In the casting industry, binding agent commonly used makes the oil-sand moulding.It is at present a large amount of that what use is to produce the product that reactions such as residue and hydrocarbon mixture, kerosene form with natural or synthetic fatty acid, be the thick fluid of dark brown, but because adhesion strength is not high, high-grade oil core percent defective is high and can not use, synthctic fat acid sludge inadequate resource and make the product price higher simultaneously, and often present out of stock.

The objective of the invention is to seek in addition an industrial production waste residue and react and make high-quality casting sand type binding agent, can not only satisfy high-grade sand mold and make needs, and can reduce its production cost significantly.

With the castor bean is that raw material is produced decanedioic acid, and the remaining middle key component of slag (hereinafter to be referred as the castor-oil plant slag) in distillation back is 12 hydroxyls, one octadecylenes (9) acid, and other are decanedioic acid, carboxylic acid and unsaponifiable matter etc., and above component can be grouped to dimeric dibasic acid at a certain temperature.It is key component that the present invention adopts this by-product waste residue exactly, reacts with pitch and makes the sand mold binding agent.Used raw material variety and weight (kg) proportioning is:

Castor-oil plant slag 540

Pitch 380～430

Soda ash 8～12

Kerosene 10～30

Sweat oil 10～30

Manufacturing process as shown in drawings.Method is: the castor-oil plant slag is heated to 100～120 ℃ in the preheating narrow-necked earthen jar; Pitch is heated to 200～220 ℃ in the preheating narrow-necked earthen jar, the castor-oil plant slag that preheating is good is delivered in the reactor, stir again that preheating is good down asphalt delivery to reactor, material keeps 160～170 ℃ of reaction 0.5～1.5h down in the still, go into other components then, stop after stirring stirring sedimentation 8～10h, test after telling moisture, qualified back packing warehouse-in.The all physical indexs of this thick fluid reach fully about the index of casting sand type with the national standard (GB12216-90) of bonding agent, its shaping strength (baked tensile strength, green compression strength) all obviously exceeds the requirement of standard, in on probation, make 1 grade of oil core and need not to add the requirement that resin and tung oil also can reach process conditions.

Characteristics of the present invention are: product quality is than existing like product height, and not only all indexs are up to state standards, and baked tensile strength is apparently higher than standard-required, and 1,2,3 grade of oil-sand type is made and all can be met the demands; Adopting industrial residue is that one of primary raw material is not only turned waste into wealth, and reduces cost of material, and goodish economic benefit is arranged; The production method advantages of simple.

Accompanying drawing is the schematic diagram of binding agent manufacturing process of the present invention.

Example

The HZ casting binder is produced, and raw materials usedly is:

Castor-oil plant slag 540kg

Pitch 410kg

Soda ash 10kg

Kerosene 20kg

Sweat oil 20kg

Its production method is: castor-oil plant slag and pitch are distinguished 100～120 ℃ and 200～220 ℃ of preheatings, the castor-oil plant slag that preheating is good is squeezed in the reactor with pump, stirring again that preheating is good down pitch adds wherein, react 1h down at 160～170 ℃, the neutralization of adding soda ash adds kerosene again and sweat oil stirs, and stops to stir sedimentation 10h, sampling and testing behind the branch water-yielding stratum, its index is as follows:

Baked tensile strength 2.4MPa

Green compression strength 0.04MPa

Gas forming amount 16ml/g

Viscosity (30 ℃) 62s

Collapsibility 0.07MPa/ effect

The requirement that all is up to state standards, baked tensile strength is higher than national standard (1.7MPa) 0.8MPa.

Claims

1. the manufacture method of the bonding agent used of a casting sand type is characterized by to adopt and produces last castor-oil plant slag and the pitch in decanedioic acid distillation back and react, and formulated with other components, its raw material weight proportioning is:

Castor-oil plant slag 540kg

Pitch 380～430kg

Soda ash 8～12kg

Kerosene 10～30kg

Sweat oil 10～30kg

Its method for making is: castor-oil plant slag, pitch are preheated to 100～120 ℃ and 200～220 ℃ respectively, with its mixing, and react 0.5～1.0h under 160～170 ℃, add other components then, stop to stir sedimentation 8～10h after stirring, tell moisture and form.