JPS5886954A - Resin binder for shell mold - Google Patents

Abstract

PURPOSE:To provide a resin binder for shell molds which does not require heat treatments after charging and improves the collapsing property of molds markedly by dissolving >=1 kind among phosphate (phosphite), phosphonate, etc. at prescribed ratios in a phenolic resin moldified with polyhydric phenol. CONSTITUTION:The above-described modified phenolic resin is prepd. by using 0.1-1.5mol polyhydric phenol (e.g.; catechol) and 0.5-2.0mol formalaldehyde in 1.0mol phenol and causing cocondensation therewith with an acid catalyst (e.g.; hydrochloric acidm oxalic acid). Thereafter 10-50pts.wt. >=1 kind among phosphate (e.g.; trimethyl phosphate), phosphite (e.g; trimethyl phosphite), etc. are dissolved in 100pts.wt. the modified phenolic resin. The resultant resin binder for shell molds does not require heat treatments after charging of molten metal, permits collapsion of molds by mechanical impact alone and is used particularly for production of castings of relatively low charging temp. such as Al castings, alloy castings or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The non-axial #IA is used for shell molding adhesives, so it is particularly useful for castings with relatively low levels of weight (such as Nikum castings, Zengjin castings, etc.). Phenol is added to the sticky mackerel copper, which is used in the manufacture and has a significantly improved disintegration property after casting. Formaldehyde and formaldehyde are 1fjll obtained by reacting with alkaline substances, or these phenol*mv are used in sand molds with low pouring temperature such as Arun castings. This requires a huge amount of cost and effort.

In other words, even after casting using these 7-eler 11 fats, the casting m still has IJI due to the low column hardness.
29 After maintaining I solidity, 6 to 1 at a high temperature of about 500℃
The 21# threshold was also jilted with heated tin*.

The mold will not collapse unless a shock is applied, and a great deal of expense and labor is required to clean it up after casting.

While people are clamoring to save energy, there is a strong demand for a sticky agent for shell molds that does not require heat treatment.Omotoya Ming requires heating and embedding after casting. A resin adhesive for shell molds that disintegrates only by mechanical shock: A target of intensive research, phosphoric acid ester,
For the selection of phosphorous esters, phosphonic esters, and phosphatides, the disintegration property after casting is significantly improved by using a resin in which at least one part of t10 to 501 is dissolved. C and t leading to failure #A - The present invention is based on polyhydric phenols α per 1.0 mole of 7 enol.
1 to 1.5 moles of formaldehyde (15 to 2.0 moles are used for cocondensation, and phosphoric acid ester, #! Phosphoric acid ester, based on 100 weight of nine-fold solution).

This invention relates to a sticky agent for shell molds containing at least one selected from phosphonic acid esters and phosphonic acid esters and phosphoric acid esters dissolved in 501 parts by volume,
At 100 to 200°C, the 9W4 type was lined with wax sand coated with the binder of the present invention and hexametherene, and the disintegration properties of the 9W4 type were significantly improved compared to conventional O casting iron. It is clear that even without heating after the ninth casting, it will collapse with just one mechanical hit. 0The literature (5chvyt
en H, A, etal, Advance.

According to Chem, Ser., 9, 7" 20 (1954), phosphorization promotes the dehydration reaction of polymers containing oxygen in their molecules, such as 2-enol resins, and promotes carbonization. It is believed that it improves flammability.

The Ministry of Non-Invention, etc. is %Mongsho 56-102965.

Phenol
It was disclosed that the phosphoric acid left behind by sand significantly improves the disintegration properties after casting.

The effect obtained with this technology is largely due to the aspect ratio effect KL by the phosphorus compound, and the collapsibility of the 2-gourd 4M fat with accelerated carbonization is improved because the cohesive force between sand grains is reduced. . In order to improve the disintegrability, the carbonization effect is directly linked to the aromatic ring to the IIt element q# in the 2-enol mercury. The next enemy is phosphorized ft*! The inventors have discovered that this process promotes the withdrawal and reaction of water and ashing in the form of dehydration, which results in the failure of the resin, leading to the present invention. Organic acids such as dichloric acid, p-toluenesulfonic acid, and Sierra Maro can be used alone or in combination.

Phenol, polyhydric phenol in non-invention.

The reaction order of formaldehyde is not particularly limited, but
Since there is no possibility of gelation, it is preferable to react with phenol or to react with phenol and formaldehyde.

The hooked esters used in the invention include trimethyl phosphate, triether phosphate, tripter phosphate, triocter phosphate, triptoxyethyl phosphate, tris(proethylene phosphate), l-suchloro-10-vinyl phosphate% triphenyl Hossheh),)
! J cresyl phosphate, tricylenyl phosphate,
Talesildine enyl phosphate, octer di-2 enyl phosphate, intermediate silenized di-2 enyl phosphate, trilauryl phosphate, triceter phosphate, tri-2 enyl phosphate.

Orthophosphorus esters such as tri-2-enyl phosphate may also be used. ' Phosphite esters include trimethyl phosphite, triethyl phosphite, tributyl phosphite, tri2
enyl phosphite, tridotesyl phosphite, trisnonylthumenylphosphite, trischloroethyl 7
Phosphite triesters such as kX7ite and tristridecyl phosphite, and phosphorous diesters such as dimethyl phosphite, diethyl phosphite and dibutyl phosphite are used. Examples of phosphonic esters include diptyl,
Butyl phosphonate, di(2-ethylhexyl) 2-ethylhexyl phosphonate, etc. are used. As the phosphine, diphenylphos-2-indoly-2-enylphosphine, mether di-2-enylphosphine, dimethylphenylphosphine, etc. are used.- The above-mentioned phosphoric acid ester! Iil is multi-111i7s norm reward * mtoon amount part vs. t, 10~5031111m1
! ! If the olG used is less than the temperature, the effect of improving the disintegration property will be small, and if it exceeds the so or imt part, the softening point of the resin will be low or the curing speed will be slow, which is not desirable.

Examples of the non-invention will be described below.
Weigh 758 grams of 7% formalin in a chef's oven, heat it on an oil bath without stirring, and react at Ra temperature until the liquid is emulsified. After the reaction was carried out at reflux temperature for 2 hours, the softening point was 10
240 g of tri-2enyl phosphate at 5℃
- 1440 g'l of resin with a softening point of 81°C was obtained by melting in a human bath.
Weigh 758 g of 37% formalin, weigh 2.5 g, and heat on an oil bath without stirring. Reaction 6 was carried out at reflux temperature, and after step 7, condensation was carried out under reduced pressure until the softening point was 105.
240 g of tri-2enyl phosphate at ℃yc or fc
Kasou 1410g1r with a softening point of 82℃
4 t * m ga 5 In a Yotsuro flask equipped with a stirrer, R-accent condenser/cer, and thermometer, 940 g of 7 enol, 1100 g of catechol,
37% formalin 1t3sg.

Weighed 12.5 g of Shella, stirred, heated on an oil bath, and reacted for 6 hours under reduced pressure. Added 600 g of cresyl di-2-enyl phosphate and reduced the pressure to mr. 11
Obtained 2620 ft of resin with a softening point of 77°C ◎ Implementation N4 47D equipped with a stirrer, reflux condenser, and thermometer
7 j s: f fc 7 s nord 940 gs 5
608 g of 7% formalin, 4'P in Sierra #2.51
While stirring, heat on an oil bath and react at 90°C for 2 minutes. After that, add 165 gk of Resol Fluoride and let it emulsify at a reflux temperature until it emulsifies and react with 2#t@R accent knitting. Comparison? I11 In a 17-day flask equipped with a stirrer, reflux condenser, and thermometer, 18801 m of phenol, 575 g of 80% formaldehyde, 487 g of 51% formalin, IN salt 11
Weigh the R4Mk and, without stirring, heat it in an oil bath for 4 minutes to overflow.
React until the reaction solution emulsifies with the creases. 2 hours mL of the jar.
After reaction in a vertical position, #I shrinkage was performed under reduced pressure to obtain Novo 2 Tsukuri Fukunol Tomaro Viscous Agent 196G with a softening point of 86°C.
gV 90 ratio IR gas 2 Stirrer, *a condenser, Yotsuro 7 lasco equipped with 2 enol 1880 Jib 80% rose formaldehyde 5ysH, sy% formalin 487g, IN
Weigh and weigh 4 liters of salt, stir, and then heat extremely hot on an oil bath. 1 flow once to emulsify the reaction solution. 0 After that, 2:114
11 The reaction was carried out at reflux temperature to form triphenylphosphor)3
76g'? was added, and the phosphoric acid ester with a softening point of 81°C was melted under reduced pressure to 111 mk to obtain 2250 gk of a novolac type phenolic resin binder. In order to compare the results, lIi fat-covered sand was produced under the following conditions.

Claims (1)

[Claims] For 1.0 mole of 1,2 enol, φ11tIlphenol M (11-1.5 mole) and formaldehyde α5-2.
Co-decomposed with acid catalyst using 0 mol 1 uom
In contrast, at least one or more 1F-10 to 501 Dongcheng, which is connected to the 2-in-1 Ester, the 2-in-1 Ester, the 2-in-1 Ester, and the 1F-10-501 C and T. Anti-fat slimming agent for shell molds that causes mold 0