JPS5961546A - Binder material for casting mold curable by hot wind - Google Patents

Abstract

PURPOSE:To provide a binder material for a casting mold which permits immediate rapping when blown with hot wind having no toxicity and has an excellent collapsing property by consisting said material essentially of a phenolic resin, water, alkali metal hydroxide and an epoxy resin. CONSTITUTION:A binder material for a casting mold curable by hot wind consists of a) a phenolic resin, b) water, c) an alkali metal hydroxide, d) an expoxy resin, e) an alcohol if necessary. The compsn. for the casting mold consisting of such binder material and refractory particles can be cured when blown with the hot wind produced by heating air having no toxicity and permits immediate rapping. The curing of the resin progresses further when the mold is allowed to rest and the casting mold having the improved mold strength under high humidity is obtd. The main binder is an org. material and the casting mold has an excellent collapsing property after a molten metal is charged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a 11-year-old steam-hardening υJ-type viscous frame removal method that can be used for the sac method of the 1st type.

Traditionally, hydraulic lath (sodium silicate) has been widely used as a method of temporarily oxidizing it with carbon dioxide gas. This is 11.

Power 1: There is no need for heat, and after blowing back enemy dregs.

Take advantage of cutting dies and other benefits. However,
Komazoha's 1 has low kiln-firing properties due to the presence of lees-komaceae or infidels-C.
．． 1 mold has a disadvantage of deterioration, and in the case of multi-αF, the strength of the sword is reduced. In order to improve the hydraulic lath) l) N, wood powder, sefi!
j, 11-tea 71-tei, which is made by cooling resin etc.
6, cIL et al. 1'1- also inhibit water glazing, completely reduce the caking force, and are not sufficient to improve mold collapsibility after injection and strengthen mold IW. Ta.

On the other hand, there are molds made from M rock lees (seal mold molds that use phenolic resin for lJ and heat them to form molds,
A self-hardening mold that hardens with 2-run synthetic acid is released.
r) Although it is superior to the disintegrability of the mold, it has drawbacks such as being unstable in heating and requiring a long time to solidify in a regular process.

In addition, phenolic resin and insea non-)f king-bearing material are used,
In addition to blowing amine gas, a dry material for molds that can be immediately hardened and cut out with an inkstone was developed.
Gas (/JThere are problems with toxicity and energy measures.

The non-invention is that the above-mentioned disadvantages can be modified for the purpose of /8, and it is used as a binder for 4f machines.
We also provide a complete set of bonding materials for molds that provide molds with improved mold strength in high humidity conditions. Regarding hot air curable @ molds made of resin and e) required °C alcohols, mold compositions made of cn and refractory particles were blown with non-toxic air and silenced heat K. After hardening, the cutting mold becomes i3J vinegar as soon as the VC is left undisturbed)
As the hardening reaction of Jh progresses, it is possible to make a mold that improves the deterioration of the mold proofing strength in high humidity conditions.In addition, the King's caking material is a unique material and has the same disintegration properties as the C/J hook shape. There is a good r1.

Harden CLJ1 by blowing hot air into the structure I2.
(+) Moisture in the caking agent is removed and the IL caking agent dries up and solidifies/, J. (2) When the molding process is resumed, the catalytic action of the alkali metals during the viscosity control [L, lj hardening reaction progresses and the casting process] is caused by the hydroxyl groups of Eliphenol 1 and the epoxy groups in the epoxy resin. Totally improves strength 7: I think fL
Ru.

The phenolic 412 used in the present invention includes not only so-called phenol-formaldehyde thread fat, but also phenol-based xylene-based fat, phenol-modified toluene fat, cashew resin, DFK (shale bend) resin, etc. Therefore, t'L is good for resins that have a norlic hydroxyl group in the J polymer skeleton and react with epoxy.

In addition, resins such as resol type, novolak type, N-methylene type resol, dimethylene ether type resol, Former/L/type sol etc. are applied to phenolic resins, and bending and stretching are applied to the J-binding type.
(Vinegar used for unintended purposes, -ml) Phenol iV, which is a raw material for making fats, does not contain phenol (cresol, butylphenol, bisphenol, nonylphenol, catechol, resorcinol 7C) .

Regarding aldehydes, formalin, paraform, hexamine, acetaldehyde, etc. are used.Water is safe because the phenolic 4111 fat and alkali metal hydroxide are uniformly coated on the refractory particles. be.

Also, if the number of sheets is too large, curing by hot air will be delayed. Phenolic resin: 5 to 500 feet per 100 feet, good 1
In particular, 50 to 200 children use n/S.

Alkali metal hydroxide, phenolic hydroxyl group, hydrophilic fundamental sound creation, polar sound reinforcement of hydroxyl group, refractory particles and (/
It is also thought that the phenolic resin acts as a catalyst for the reaction between the phenolic resin and the epoxy resin. For example, sodium hydroxide, potassium hydroxide, lithium hydroxide Ct, and J1m1k may be mixed with fL, but sodium hydroxide is preferable from the degree of hydrophilicity. The distribution of hydroxide C/J in alkali metal is 1 to 100 times per phenolic resin 100 to 10 to 6011 times.
Kakito user 1 [ru. If there is a large amount of wood, the curing due to heat lice will be slowed down, and the reaction rate between the epoxy resin and the epoxy resin will also be slow.
z The mold strength also decreases.

Epoxy! 3kllD, 7cNol hydroxyl group and epoxy group react to increase molecular weight, increase hydrophobicity, and improve mold strength. a) Phenolic resin b) Water C) Alkali gold h4(/,) hydroxide and d
) Depending on your safety, the caking material from alcohol can be hot air [
Lll) It can be hardened and used as a caking material for molds, but for high humidity, use the same process as water glass-carbon dioxide molds.
One drawback is that the strength of the mold is reduced. C (L) The defect is corrected by the rock, and the epoxy resin reacts with the niline enol water group and the epoxy group, and the 1 molecular weight increases, and the hydrophobicity becomes large, and the mold strength in high humidity increases. It is thought that it prevents the deterioration of IL20.The epoxy resin referred to here is a chemical product that contains an epoxy group in the molecule and is commonly referred to as epoxy resin.
/b are all superior, and there are no restrictions on the structure of the EBOKI 7 and the glycidyl ether type, cricidyl ester type, and alicyclic type resin structure. It is also not limited to the tree JJiiC/, I shape. In general, it is preferable to use a low viscosity material that has a refractory coating effect, and a low-molecular-weight compound such as epoxy or MUJ type is generally preferable.

You may also add 5 parts of a mulch to 1 part of the viscosity or tied consistency. This solvent is one that completely dissolves the epoxy compound, and IL may be used as an example, and is usually rJ acetone,
Theta ketones such as methyl ether ketone and cyclohexanone,
Toluene and cyclohexanone naphtha are used, but epoxy resin can also be used.

For distributing the epoxy resin, it is preferable to use a phenolic resin of 100 violet parts and Q, 7 to 200 parts and Kamise. The curing speed slows down due to excessive heating and heat lice, and if it cools down a little, it becomes ineffective.

Alcohol can be distributed as needed to the present invention.

As alcohols, lower-1 alcohols and polyhydric alcohols can be used.

Lower-hydric alcohol, phenolic fat refractory particles Q-) Good wave-breaking properties, and also caking material C by heat
It has the effect of promoting lJhori adhesion and improving caking force. Polyhydric alcohol also has the effect of enhancing the strength of the fishing mold and giving the skin of the mold a distinct appearance. Alcohols include methanol, ethanol, n-globyl alcohol, in7-globyl alcohol, t-butyl alcohol, ethylene glycol, globylene glycol, glycerin, diethylene p
'+) Cole, diglobylene glycol, trimetherolgloban, trimethylolethane, sorbitol,
When VJ-heavy materials such as Mannit, Zuru 7, etc. are used, it is preferable to use 60Q electric parts or less for 400 parts and 400 parts of tiL & euphenol resin used. b There is a drawback that it is hard and sad.

The refractory particles used in the present invention are prepared using a mortar normally used in mold making. Examples include silica sand, zircon sand, oripin sand, chromite sand, etc. fL/
b0 Also graphite powder, cold dust, etc. ('J li5';
Of course, it is also possible to add VC to the @-type composition 4].

Although there are no particular restrictions on the method of applying weight to the refractory particles with the caking material, it is preferable to use a speed mixer, a continuous mixer, a mer 2l, etc. that have continuity υ.

ICJ of the present invention: 6 Caking material is kneaded with refractory particles / ζ Breast-shaped ho 1 [C which is kept in a proboscis occlusion device is preferable, but preferred is Nkon @ Shun 〇The temperature of the hot air VC used is 50°C to 200'CQ, which can remove moisture from the caking material and has a good T'L.

In addition to the copper refractory particles distributed in the mold, the pressure required to trace between the particles is sufficient with hot air.

It is best to blow hot air into molds or reeds that have hardened and are strong enough to be cut out from patterns such as wooden molds.

0.5 at normal pressure to 0.1-5.0 kg/cm
It takes about 5 minutes, depending on the size of the mold and the air permeability of the refractory particles.

The caking material of the present invention is loaded with refractory particles and used as a type 1 M composition. To refractory particles (/
It is preferable that the J sister mixture is uniformly mixed,
It is preferable that the refractory particles be coated evenly. The amount of caking material used is preferably 5 to 20 parts, more preferably 1 to 10 M parts per 100 df of refractory particles. Cooling force on refractory particles 1 The method is not particularly prescribed, but some or all of the components of the viscous phase may be cooled to a smooth, damp, heavy layer, or immersed in water or alcohol. It can be added as a bath liquid, emulsion, or suspension to form a caking material. A mixed bath liquid is prepared, and a molding composition is prepared by adding an epoxy resin to the refractory particles (-11).

Examples of CtJ of the present invention are shown below.

Example 1 Phenolic citron fat (a) clJ production method Cooler (Four IC four-roof flask with full stirring capacity V-phenol 940
g, 240 g of 37% formaldehyde, 190 g of 80% paraformaldehyde, and 4 g of IN hydrochloric acid. Type) Obtain phenolic resin (a) Ov, method for producing viscous tier 11 distributed sand for J type Speed mixer made by Enshu Tekko (5 kg capacity) 4k Iwami No. 6 silica sand
g 11, Phenolic II fat (a) mentioned above 6
0 g, water 60 g, sodium hydroxide + Og, and methanol 30 g. Katana W
, ) 20g was cooled and weighed for 2 minutes, and served at a sand party where the sweetfish was distributed.

Test piece for compressive strength side (/-J manufacturing method Samurai et al. 11-1 ζ lees filtered 6 sand 155 g was made into a 50φυ wooden mold using a human II-rammer τ to make a 50φ×50mm
Height test 1 ash piece molding at 120℃ (IJ heat 1 match 3,
[J kg/cm" (/J Positive pressure for 5 minutes to test the compressive strength. 24 inside
Compressive strength after leaving for hr 25°C1
The pressure force was measured for 24 hours in a desiccator filled with water.

Measurement value of test piece on cloth-1? Indication π0 Example 2 Phenolic resin B blinded in Example 1, resin (a)
Using 4 kg of silica sand (Iwami No. 6), distribute n-order phenolic resin (a) 60 to 4 kg of silica sand (Iwami No. 6) using 8 pi.
g, 80 g of water, 3 g of sodium hydroxide, and 20 g of chrycerin.
(One point 68°C 1 epoxy resin made by Ili Chemical Co., Ltd. 450-500, molecular weight approximately 900)
40g' (! - Dissolved in 20g of acetone 1 Tsuru 1 sword salt bath 11 pieces of water and 2 minutes 1 u 4 mixed with 4 pieces. Implementation?! I
A test piece was prepared in the same manner as + and the test piece was measured.
C-w, L, friend 0 Comparison 1 Tarifenolic acid (added to fat) 1
I used Gekito Hyakukai. The dried lees-carrying sand was manufactured in the same manner as Fusei Plane 11 without applying an air coat. Show 7? :.

Table-1 Measured milled rice Note 1) Immediately after, at 941 degrees, the aircraft ejected ηj and dispersed its tail and flew to the side.

Note 21 (B)/Concept is a 6-value method for reducing mold strength when there are many teeth.

Implemented again? IJ+, 2 and Comparison V When we delivered the core-making cast iron using the cohesive material distribution sand used previously and tested it for sand lubricity, we found that Izusu L also had good mold crumbling properties. Confirmed? c.

Claims (1)

[Claims] 1.8) Phenolic ff1f fat, b) water, C) alkali metal hydroxide, d) epoxy position 1 fat, and e) necessary 1f.
A hot air-curable mold caking material made of alcohol according to C. 2. Alkali metal υ hydroxide! IJ or sodium hydroxide l) Ram t1 defense punishment #jI request's impregnating power j body ↓ 1 step m1 match's heat lice, side 2 conversion fishing type sticky sweetfish killing fee.