Preparation methods of binding agent for casting and matched curing agent thereof

Abstract

The invention relates to preparation methods of a binding agent and a matched curing agent thereof, in particular to preparation methods of a binding agent for casting and a matched curing agent thereof. The preparation method of the binding agent for casting comprises the steps that stillingia oil and polyhydric alcohol are added in a reaction kettle, stirring is started, electrical heating is turned on, and nitrogen is introduced into the reaction kettle for protection; the temperature is increased to 130 DEG C, a catalyst is added, and when the material liquid temperature is increased to 210-225 DEG C, a timed reaction is performed for 3-4 hours; after heat preservation is finished, cooling water is introduced to lower the temperature, when the material liquid temperature is lowered to 100-130 DEG C, nitrogen is closed, polybasic acid and a water-carrying agent are added, and the temperature is increased; timing starts to be performed when refluxing occurs in the material liquid temperature increasing process, and a reflux reaction is kept for 0.5-2 hours; after refluxing is finished, cooling water is introduced to lower the temperature; when the material liquid temperature is lowered to 120 DEG C, solvent and a drier are added, the temperature is lowered below 70 DEG C, stirring is stopped, and discharging is performed. The preparation methods are unique and can effectively solve the problem that the stripping time is longer at low temperature, the influence on the usable time of casting sand at low temperature is less, and safety and reliability are achieved.

Description

technical field

[0001] The invention relates to a preparation method of a binder and a matching curing agent thereof, in particular to a preparation method of a casting binder and a matching curing agent thereof. Background technique

[0002] At present, furan resin or phenolic resin is mostly used as sand mold / core binder in my country's foundry industry, but due to its short service life, it is not suitable for the production of large castings, especially steel castings. In the notification number CN201410589925.4, the inventor proposed a production process using rapeseed oil as the main raw material. During the application process, it was found that the time required for the molding sand to be molded was relatively long when the temperature was low. During the casting production process will reduce efficiency.

[0003] There is currently no method for overcoming the aforementioned drawbacks. Contents of the invention

[0004] The purpose of the present invention is to...

Examples

Embodiment 1

[0019] Embodiment 1: A method for preparing a casting binder. The method is to add 55% catalpa oil and 5.4% pentaerythritol to the reaction kettle, start stirring, turn on the electric heating, and pass nitrogen protection; heat up to 130 ° C, add calcium oxide 0.1%, wait for the temperature of the feed liquid to rise to 210-225°C and react for 4 hours; after the heat preservation is over, pass cooling water to cool down; wait for the feed liquid to cool down to 120°C, turn off the nitrogen, add phthalic anhydride 11.5%, xylene 1 %, heat up; start timing when the temperature of the feed liquid rises to reflux, and keep the reflux reaction for 0.5 hours; after the reflux is completed, pass cooling water to cool down; cool the feed liquid to 120°C, add 26% of 200# solvent oil, and add cobalt naphthenate 1%; cool down to below 70°C and stop stirring.

[0020] The preparation method of its supporting curing agent is as follows:

[0021] Heat the polyisocyanate to 40°C with a roll...

Embodiment 2

[0022] Example 2: A method for preparing a casting binder. The method is to add 45% catalpa oil and 9.4% glycerin to the reaction kettle, start stirring, turn on the electric heating, and pass nitrogen protection; heat up to 130 ° C, add calcium oxide 0.1%, wait for the temperature of the feed liquid to rise to 210-225°C and react for 4 hours; after the heat preservation is over, pass cooling water to cool down; wait for the feed liquid to cool down to 120°C, turn off the nitrogen, add maleic anhydride 12%, xylene 1 %, heat up; when the temperature of the feed liquid rises to reflux, start timing, and keep the reflux reaction for 1 hour; %; Cool down to below 70°C and stop stirring and discharging.

[0023] The preparation method of its supporting curing agent is as follows:

[0024] Heat the polyisocyanate to 40°C with a drum for later use; add 12% of tributyl citrate to the stirring tank, add 70% of the prepared polyisocyanate, stir for 20 minutes, add 9% of dibasic acid es...

Embodiment 3

[0025] Example 3: A method for preparing a casting binder. The method is to add 40% catalpa oil and 5.4% pentaerythritol to the reaction kettle, start stirring, turn on the electric heating, and pass nitrogen protection; heat up to 130 ° C, add calcium oxide 0.1%, wait for the temperature of the feed liquid to rise to 210-225°C and react for 3 hours; after the heat preservation is over, pass cooling water to cool down; wait for the feed liquid to cool down to 120°C, turn off the nitrogen, add phthalic anhydride 20%, xylene 1 %, heat up; when the temperature of the feed liquid rises to reflux, start timing, and keep the reflux reaction for 0.5 hours; %; Cool down to below 70°C and stop stirring and discharging.

[0026] The preparation method of its supporting curing agent is as follows:

[0027] Heat the polyisocyanate to 40°C with a drum for later use; add 8% of tributyl citrate to the stirring tank, add 80% of the prepared polyisocyanate, stir for 20 minutes, add 5% of diba...

technical field

[0001] The invention relates to a preparation method of a binder and a matching curing agent thereof, in particular to a preparation method of a casting binder and a matching curing agent thereof. Background technique

[0002] At present, furan resin or phenolic resin is mostly used as sand mold / core binder in my country's foundry industry, but due to its short service life, it is not suitable for the production of large castings, especially steel castings. In the notification number CN201410589925.4, the inventor proposed a production process using rapeseed oil as the main raw material. During the application process, it was found that the time required for the molding sand to be molded was relatively long when the temperature was low. During the casting production process will reduce efficiency.

[0003] There is currently no method for overcoming the aforementioned drawbacks. Contents of the invention

[0004] The purpose of the present invention is to...

Examples

Embodiment 1

[0019] Embodiment 1: A method for preparing a casting binder. The method is to add 55% catalpa oil and 5.4% pentaerythritol to the reaction kettle, start stirring, turn on the electric heating, and pass nitrogen protection; heat up to 130 ° C, add calcium oxide 0.1%, wait for the temperature of the feed liquid to rise to 210-225°C and react for 4 hours; after the heat preservation is over, pass cooling water to cool down; wait for the feed liquid to cool down to 120°C, turn off the nitrogen, add phthalic anhydride 11.5%, xylene 1 %, heat up; start timing when the temperature of the feed liquid rises to reflux, and keep the reflux reaction for 0.5 hours; after the reflux is completed, pass cooling water to cool down; cool the feed liquid to 120°C, add 26% of 200# solvent oil, and add cobalt naphthenate 1%; cool down to below 70°C and stop stirring.

[0020] The preparation method of its supporting curing agent is as follows:

[0021] Heat the polyisocyanate to 40°C with a roll...

Embodiment 2

[0022] Example 2: A method for preparing a casting binder. The method is to add 45% catalpa oil and 9.4% glycerin to the reaction kettle, start stirring, turn on the electric heating, and pass nitrogen protection; heat up to 130 ° C, add calcium oxide 0.1%, wait for the temperature of the feed liquid to rise to 210-225°C and react for 4 hours; after the heat preservation is over, pass cooling water to cool down; wait for the feed liquid to cool down to 120°C, turn off the nitrogen, add maleic anhydride 12%, xylene 1 %, heat up; when the temperature of the feed liquid rises to reflux, start timing, and keep the reflux reaction for 1 hour; %; Cool down to below 70°C and stop stirring and discharging.

[0023] The preparation method of its supporting curing agent is as follows:

[0024] Heat the polyisocyanate to 40°C with a drum for later use; add 12% of tributyl citrate to the stirring tank, add 70% of the prepared polyisocyanate, stir for 20 minutes, add 9% of dibasic acid es...

Embodiment 3

[0025] Example 3: A method for preparing a casting binder. The method is to add 40% catalpa oil and 5.4% pentaerythritol to the reaction kettle, start stirring, turn on the electric heating, and pass nitrogen protection; heat up to 130 ° C, add calcium oxide 0.1%, wait for the temperature of the feed liquid to rise to 210-225°C and react for 3 hours; after the heat preservation is over, pass cooling water to cool down; wait for the feed liquid to cool down to 120°C, turn off the nitrogen, add phthalic anhydride 20%, xylene 1 %, heat up; when the temperature of the feed liquid rises to reflux, start timing, and keep the reflux reaction for 0.5 hours; %; Cool down to below 70°C and stop stirring and discharging.

[0026] The preparation method of its supporting curing agent is as follows:

[0027] Heat the polyisocyanate to 40°C with a drum for later use; add 8% of tributyl citrate to the stirring tank, add 80% of the prepared polyisocyanate, stir for 20 minutes, add 5% of diba...