SU722651A1 - Binder for producing casting molds and cores - Google Patents

Description

This invention relates to a foundry, in particular, to a binder used in mixtures for making foundry cores and molds. The closest to the present invention is a binder based on wood thermolysis resins - KVO-2, oxysane, precipitated resins, a resin is separated from it, etc. flj However, the strength properties and intensity of heat curing of mixtures based on them are insufficient and are, respectively, 8–9 kgf / cm in rarefaction and 2–30 minutes. The purpose of the invention is to reduce the curing time during heat treatment and increase the strength of the molds and cores. To achieve this goal, a binder for the manufacture of casting molds and cores, cured. heat treatment, including wood chemical processing products based on wood thermolysis resins, additionally contains amino compounds selected from a range of amino alcohols or aromatic amines, with the following ratio of ingredients, wt.%: Wood chemical processing products based on wood thermolysis resin materials selected from from a series of amino alcohols or aromatic; kimy amines1-30 As an amino compound selected from a range of amino alcohols, the binder contains monoethanolamine or triethanolamine, and as an amino Inonii of a series of aromatic amines - aniline aniline hydrochloric nokislsh. The data on the indicated amnosomendia are given in table. one.

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Title

MRTU 6-02-471-6845О

MRTU 6-02-403-62460

GOST 313-69345

GOST 5243-68500 In addition to amnesoedinides from the amide sprays and aromatic amines, a similar technical effect is also ensured by using some primary, secondary and tertiary aliphatic amines, methyl ™ amine, ethylamine, diethylamine, triethyl ™ amine and polymeric compounds based on them (for example, , polyethylene polyamyl} However, the use of many of these compounds is limited due to their toxicity, exacerbated by high flying honor of vapors of aliphatic amines. As aromatic amines can be used Phenylenediamine dimethylaniline, triya ({ugylamine, which are also toxic compounds), however, the volatility of their vapors substantially peaks than aliphatic amines, which allows them to be used in foundry production. Most preferably, the aforementioned amino alcohols are used as Low-toxic compounds. When the content in the binding amino compound is lower and higher than the indicated limits, their positive effect is not observed either for the duration of the thermal curing and strength of the forms and rods. Ingredients

Binding KVS-2 (TU 81-O5-18-71)

Resin sedimentary (TU OP ZO-75) Smolp wood settling (OST 8155-72)

ъ Foam for I t, rub

. „„.

  J. - “- I c. , J.-..- J .., .B ± Kicv..n "

85

7О 9О 85

99

85 The products of wood chemistry processing based on wood thermolysis resins are KVS-2 binders (TU 81-O518-71), oxysane (TU 81-O5-33-72), sedimentary resin (TU OP 30-Z); sediment and soluble resin of wood thermolysis - resin for activated carbons (TU 81-05-91-69), wood resin (TU 81-O5-36-73), wood resin (OST 81-55-72) and so on. d. The binder is prepared by thoroughly mixing until a uniform distribution by volume of products containing wood thermolysis resins and amine compounds. Moreover, amines that are in a solid state should be dissolved in solvents before being introduced into resins. In production conditions, the preparation of the binder and the mixture can be combined by introducing products containing wood thermolysis resins and amine compounds into a refractory filler (silica sand). followed by thorough mixing until they are evenly distributed throughout the mixture. In tab. 2 shows the compositions of binder №№ 1-7. . Table2 neighing ingredients, wt.% Binder composition

Continued Table 2

Trietacolamine Aniline (Phenylamine) Aniline, Sulfuric

In tab. Figure 3 shows the composition of heat-curing mixtures that use binders. Nos. 1-7. Mixture number 8 illustrates. opportunity razIngredienty

Quartz sand 1K02A

Binder No.1 N92

Number 3

№4 №5

№6 №7

Resin sedimentary (TU OP 30-75)

Triethanolamine Molding clay

The binder compositions nos. 1–7 cm. In table. one.

The properties of the mixtures with the proposed MoN 1-8 and known (NO) binder are shown in Table. 4. Standard image30

15 15

1O

15

the individual administration of the binder ingredients during the preparation of the mixture. Mixture No. 9 was prepared with a binder according to the prototype.

T a b l and c a 3

Content of ingredients, wt.%

92

, 92 92 92 92 91.4

92

6

6

6

These mixtures were hardened during heat treatment {22О230 С).

Claims (3)

Claim 1. Binder for the manufacture of foundry molds and cores, heat-cured, including products of wood-chemical processing based on resins of wood thermolysis, which is related to the fact that, with a chain of reducing the duration of curing during heat treatment and increasing strength forms and rods, it additionally contains an amino compound 30 selected from a number of amino alcohols or aromatic: amines in the following ratio of ingredients, wt.%: Resin-based wood chemical products 35 wood thermolysis 70-99 Amino compounds selected from a number of amino alcohols or aromatic amines 1-30 2. Binder according to 1, distinguish- 40 e. E. In that, as an amino compound selected from a number of amino alcohols, it contains monoethanolamine or triethanolamine. 3. Binder for π. 1, 45 charac teristic in that, as amino compounds selected from a number of aromatic amines, it contains aniline or aniline hydrochloride. 50 Sources of information taken into account in the examination 1. Directory of wood chemist. M., 'Forest industry', 1974, p. 207-220. TsNIIIPI Order 910/4 Circulation 889 Subscription Branch of PPP 'Patent', Uzhhorod, st. Project, 4