Cold-box binding agent systems and mixtures for use as additives for such binding agent systems

Abstract

A description is provided of a mixture which is preparable by allowing the reaction of a premixture of (av), methanesulfonic acid (bv), one or more esters of one or more phosphorous-oxygen acids and (cv) one or more silanes. The invention also concerns the use of said mixtures as additives for the polyisocyanate component of a two-component binding agent system for preparation of a polyurethane resin. The invention further concerns a solution containing polyisocyanate for use as a component of a molding material binding agent system, and the use of a solution containing polyisocyanate as the polyisocyanate component of a two-component binding agent system for preparation of a polyurethane resin and corresponding two-component binding agent systems for preparation of a polyurethane resin.

Description

technical field

[0001] The present invention relates to a compound capable of being prepared by reacting a premixture of (av) methanesulfonic acid, (bv) one or more esters of one or more oxyphosphoric acids and (cv) one or more silanes mixture. Furthermore, the invention relates to the use of said mixture as an additive for the polyisocyanate component of two-component adhesive systems for the production of polyurethane resins. Furthermore, the invention relates to solutions comprising polyisocyanates for use as components of adhesive systems for molding materials; and the use of solutions comprising polyisocyanates as the polyisocyanate component of two-component adhesive systems for the preparation of polyurethane resins; and the corresponding two-component adhesive systems for the preparation of polyurethane resins. The invention likewise relates to the use of a solution comprising polyisocyanate and a two-component binder system for the manufacture of foundry sand cores ...

Examples

example 1

[0167] Example 1: Preparation of mixture M1 according to the invention :

[0168] The following substances were dispensed in the order indicated in a reaction vessel equipped with a stirrer, cooling device and thermometer, wherein the temperature was kept below 35°C:

[0169]

[0170] The product is a mixture according to the invention.

[0171] Example 1a: Preparation of mixture M2 according to the invention :

[0172] The following substances were dispensed in the order indicated in a reaction vessel equipped with a stirrer, cooling device and thermometer, wherein the temperature was kept below 35°C:

[0173]

[0174] The product is a mixture according to the invention.

[0175] Example 1b: Preparation of mixture M3 according to the invention :

[0176] The following substances were dispensed in the order indicated in a reaction vessel equipped with a stirrer, cooling device and thermometer, wherein the temperature was kept below 35°C:

[0177] 25.84 GT Dibuty...

example 2

[0181] Example 2: Preparation of preferred benzyl ether type phenolic resins (precondensates) :

[0182] Place the following in a reaction vessel equipped with a cooling device, thermometer and stirrer:

[0183]

[0184] Put the cooler on reflux. The temperature was continuously increased to 110 °C within 1 hour and maintained at said temperature until the refractive index (n D 20 ) to 1.547 (2 to 3 hours).

[0185] Then, the cooler was switched to atmospheric distillation and the temperature was increased to 125°C-126°C within 1 hour, so that volatile components were distilled from the product solution until the refractive index of the product (n D 20 ) reaches about 1.595.

[0186] Then carry out vacuum distillation, until the refractive index (n D 20 ) is 1.617, where the remaining volatile components are removed.

example 3

[0187] Example 3: Preparation of cold box phenolic resin solution H1 :

[0188]From the phenolic resin (precondensate) according to Example 2, after reaching the desired value for the refractive index, a resin solution H1 for the cold box process was prepared, which solution had the composition specified below:

[0189] Phenolic resin solution H1

[0190]

technical field

[0001] The present invention relates to a compound capable of being prepared by reacting a premixture of (av) methanesulfonic acid, (bv) one or more esters of one or more oxyphosphoric acids and (cv) one or more silanes mixture. Furthermore, the invention relates to the use of said mixture as an additive for the polyisocyanate component of two-component adhesive systems for the production of polyurethane resins. Furthermore, the invention relates to solutions comprising polyisocyanates for use as components of adhesive systems for molding materials; and the use of solutions comprising polyisocyanates as the polyisocyanate component of two-component adhesive systems for the preparation of polyurethane resins; and the corresponding two-component adhesive systems for the preparation of polyurethane resins. The invention likewise relates to the use of a solution comprising polyisocyanate and a two-component binder system for the manufacture of foundry sand cores ...

Examples

example 1

[0167] Example 1: Preparation of mixture M1 according to the invention :

[0168] The following substances were dispensed in the order indicated in a reaction vessel equipped with a stirrer, cooling device and thermometer, wherein the temperature was kept below 35°C:

[0169]

[0170] The product is a mixture according to the invention.

[0171] Example 1a: Preparation of mixture M2 according to the invention :

[0172] The following substances were dispensed in the order indicated in a reaction vessel equipped with a stirrer, cooling device and thermometer, wherein the temperature was kept below 35°C:

[0173]

[0174] The product is a mixture according to the invention.

[0175] Example 1b: Preparation of mixture M3 according to the invention :

[0176] The following substances were dispensed in the order indicated in a reaction vessel equipped with a stirrer, cooling device and thermometer, wherein the temperature was kept below 35°C:

[0177] 25.84 GT Dibuty...

example 2

[0181] Example 2: Preparation of preferred benzyl ether type phenolic resins (precondensates) :

[0182] Place the following in a reaction vessel equipped with a cooling device, thermometer and stirrer:

[0183]

[0184] Put the cooler on reflux. The temperature was continuously increased to 110 °C within 1 hour and maintained at said temperature until the refractive index (n D 20 ) to 1.547 (2 to 3 hours).

[0185] Then, the cooler was switched to atmospheric distillation and the temperature was increased to 125°C-126°C within 1 hour, so that volatile components were distilled from the product solution until the refractive index of the product (n D 20 ) reaches about 1.595.

[0186] Then carry out vacuum distillation, until the refractive index (n D 20 ) is 1.617, where the remaining volatile components are removed.

example 3

[0187] Example 3: Preparation of cold box phenolic resin solution H1 :

[0188]From the phenolic resin (precondensate) according to Example 2, after reaching the desired value for the refractive index, a resin solution H1 for the cold box process was prepared, which solution had the composition specified below:

[0189] Phenolic resin solution H1

[0190]

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