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A kind of production method of cold glue for lost foam casting

A technology of lost foam casting and production method, applied in casting molding equipment, monocarboxylate copolymer adhesive, adhesive type, etc., can solve the problem of simple synthesis process, high bonding strength, fast bonding speed, etc. problem, to achieve the effect of simple synthesis process, high bonding strength and fast bonding speed

Active Publication Date: 2015-10-28
共享新材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there is no cold glue with fast bonding speed, high bonding strength and simple synthesis process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: a kind of production method of cold glue for lost foam casting, the method comprises the steps:

[0020] a. Dissolve 0.2% azobisisobutylcyanide in 20% methanol to prepare an initiator-methanol solution, add 1 / 4 of the prepared solution to the reaction kettle, and stir.

[0021] b. Add 50% vinyl acetate into the reaction kettle, the methanol in the reaction kettle starts to reflux when the temperature rises, and keep warm by timing.

[0022] c. Add 1 / 4 of the prepared initiator-methanol solution every 35 minutes, and continue the reaction after adding the initiator-methanol solution.

[0023] d. Vinyl acetate monomer is gradually polymerized and becomes viscous. Take a sample to check the viscosity. The viscosity is 16000mPa·s (25°C). Remove the unreacted monomer.

[0024] e. Dissolve 0.1% azobisisobutylcyanide in 29.7% methanol, add it into the reaction kettle, stir and keep warm for 30 minutes before discharging.

Embodiment 2

[0025] Embodiment two: a kind of production method of cold glue for lost foam casting, the method comprises the steps:

[0026] a. Dissolve 0.3% azobisisoheptyl cyanide in 25% methanol to prepare an initiator-methanol solution, add 1 / 5 of the prepared solution to the reaction kettle, and stir.

[0027] b. Add 45% butyl acrylate to the reaction kettle, heat up, and keep warm after the temperature rises to reflux.

[0028] c. Add 1 / 5 of the prepared initiator-methanol solution every 30 minutes, and continue the reaction after adding the initiator-methanol solution.

[0029] d. The butyl acrylate monomer is gradually polymerized and becomes sticky. Take a sample to check the viscosity. The viscosity is 18000mPa·s (25°C), and remove the unreacted monomer.

[0030] e. Dissolve 0.15% azobisisoheptyl cyanide in 29.55% methanol, add it to the reaction kettle, stir and keep warm for 40 minutes before discharging.

Embodiment 3

[0031] Embodiment three: a kind of production method of cold glue for lost foam casting, this method comprises the steps:

[0032] a. Dissolve 0.25% dibenzoyl peroxide in 28% ethanol to prepare an initiator-ethanol solution, add 1 / 6 of the prepared solution to the reaction kettle, and stir.

[0033] b. Add 42% methyl methacrylate to the reactor, heat up until the reactor starts to reflux, and keep it warm by time.

[0034] c. Add 1 / 6 of the prepared initiator-ethanol solution every 20 minutes, and continue the reaction after adding the initiator-ethanol solution.

[0035] d. The methyl methacrylate monomer is gradually polymerized and becomes viscous. Take a sample to check the viscosity. When the viscosity is 15000 Pa·s (25°C), remove the unreacted monomer.

[0036] e. Dissolve 0.15% dibenzoyl peroxide in 29.6% ethanol, add it into the reaction kettle, stir and keep warm for 50 minutes before discharging.

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Abstract

The invention relates to a production method of cold glue, and particularly relates to a production method of the cold glue used for lost foam casting. The method comprises the following steps of dissolving an initiator in a solvent to prepare a solution; adding 1 / 6-1 / 4 of the prepared solution into a reaction kettle; stirring; adding monomers into the reaction kettle; heating the reaction kettle until the solution refluxes; keeping warm; adding 1 / 6-1 / 4 of the prepared initiator solution every 25-40 minutes; reacting continuously after the initiator solution is completely added, the monomers being polymerized and becoming viscous; taking a sample and detecting viscosity; removing un-reacted monomers when the viscosity is 15,000-20,000 mPa.s; dissolving 0.1-0.2% of the initiator in 25-30% of a solvent; adding the obtained solution in the reaction kettle; stirring and keeping the temperature for 30-60 minutes; and discharging materials. The cold glue is fast in bonding speed and high in bonding intensity; a synthetic process is simple; and cost is low. The cold glue can meet normal production use of lost foam casting.

Description

technical field [0001] The invention relates to a production method of cold glue, in particular to a production method of cold glue for lost foam casting. Background technique [0002] Lost foam casting, also known as solid mold casting, is to bond and combine paraffin or foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding. Down pouring, the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method. Because of the complex shape that cannot be foamed as a whole, it is generally divided into several parts that are foamed and molded separately, and then bonded into a whole. In addition, the casting of the overall shape also needs to be bonded with accessories such as sprue gates. [0003] The binder for lost foam casting is to apply glue on the bonding surface of the white mold, and through t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J131/04C09J133/08C09J133/12C09J133/02C09J133/10C08F118/08C08F120/18C08F120/14C08F120/06C08F120/28C08F4/04C08F4/34B22C7/02
Inventor 崔刚杨洋张晓忠肖青国
Owner 共享新材料(山东)有限公司