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A kind of bio-adhesive binder based on waterborne polyurethane modification and preparation method thereof

A technology of water-based polyurethane and bio-glue, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of difficult popularization and application, harsh casting conditions, and difficult regeneration of molding sand, etc., and achieve broad market prospects and good collapsibility , the effect of no obvious decrease in strength

Inactive Publication Date: 2020-08-04
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the problems in the prior art are: the existing sodium acrylate resin binder and polyvinyl alcohol (PVA) aqueous solution binder have low strength, difficult regeneration and CO 2 The hardened alkaline phenolic resin produces some toxic gases during the casting process, and the casting conditions of epoxy resin and phenolic resin are harsh and harmful gases are produced, so it is difficult to popularize and apply.
The main component of the water glass type binder is silicate, which is prone to defects such as poor collapsibility and large pores during the bonding process, and a large number of unqualified products are prone to appear during the casting process, and the molding sand The regeneration is difficult, the cost is relatively large, etc.

Method used

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  • A kind of bio-adhesive binder based on waterborne polyurethane modification and preparation method thereof
  • A kind of bio-adhesive binder based on waterborne polyurethane modification and preparation method thereof
  • A kind of bio-adhesive binder based on waterborne polyurethane modification and preparation method thereof

Examples

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Effect test

preparation example Construction

[0025] like figure 1 As shown, the preparation method based on the water-based polyurethane modified bio-adhesive binder provided by the embodiments of the present invention may further comprise the steps:

[0026] In the first step, weigh 50g of biogel solid particles and transfer them to a 250mL three-necked bottle, add 45mL of distilled water to swell, and after the water is swollen, place it on the electric heating mantle with a pre-set temperature of 70°C and set up a mechanical stirring device. Turn on the stirring; the rotating speed is 120r / min. When heating until the temperature of the bioglue is 40°C, keep the temperature constant, and react for 0.5h.

[0027] In the second step, after heating at 40°C for 0.5h, the bioglue is completely dissolved. Increase the rotation speed to 200r / min, raise the temperature to 50°C, add an aqueous solution of inorganic base A (2g of inorganic base A is dissolved in 5mL of distilled water), and react for 0.5 h. As the reaction pr...

example 1

[0031] Example 1 is based on water-based polyurethane modified bio-adhesive binder, made of the following raw material components,

[0032] The sand particle size is 1Kg of quartz sand of 50-100 mesh, 0.05Kg of bio-glue particles, 0.05Kg of tap water, and 0.001Kg of modifier.

[0033] The preparation method of the "8" block type sand sample based on biological glue binder comprises the following steps:

[0034] Step 1: transfer the accurately weighed quartz sand into the sand mixer and start stirring;

[0035] Step 2 Slowly add inorganic base B (8g) into the sand mixer, and mix evenly at a certain speed for 15s.

[0036] Step 3 Slowly add 40g of bio-glue binder and stir for 60s-90s.

[0037] Step 4 Put an appropriate amount of evenly mixed quartz sand into the cold box testing machine, set the air blowing time to 5 minutes, and the air blowing pressure to 0.4MPa~0.8MPa.

[0038] Step 5 Take out the sand sample from the cold box testing machine and test its corresponding mec...

example 2

[0039] Example 2 is based on the bio-adhesive binder modified by water-based polyurethane, made of the following raw material components:

[0040] The sand particle size is 1Kg of quartz sand of 50-100 mesh, 0.05Kg of bio-glue particles, 0.05Kg of tap water, and 0.001Kg of modifier.

[0041] The preparation method of the "8" block type sand sample based on biological glue binder comprises the following steps:

[0042] Step 1: Transfer the accurately weighed quartz sand into the sand mixer and start stirring.

[0043] Step 2 Slowly add inorganic base B (8g) into the sand mixer, and mix evenly at a certain speed for 15s.

[0044] Step 3 Slowly add 40g of bio-glue binder and stir for 90s-120s.

[0045] Step 4 Put an appropriate amount of quartz sand mixed evenly into the cold box testing machine, set the air blowing time to 5 minutes, and the air blowing pressure to 0.4MPa-0.8MPa.

[0046] Step 5 Take out the sand sample from the cold box testing machine and test its correspon...

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Abstract

The invention belongs to the technical field of bio-adhesive binders, and discloses a bio-adhesive binder based on waterborne polyurethane modification and a preparation method thereof. A modifier, namely waterborne polyurethane accounts for 1.0%-3.0% by mass of the bio-adhesive binder, a curing agent, namely inorganic alkali B added in the sand mixing process accounts for 0.3%-1.0% of quartz sand, and the bio-adhesive binder added in the sand mixing process accounts for 1.0%-4.0% of quartz sand. The compositions of bio-adhesive particles prepared through the invention are tested in an analysis and testing center, and the environmental performance meets the requirements. The sand performance test was carried out in a company, and the results are in line with industrial production requirements. Through the bio-adhesive binder, the problem of contamination of organic resin sand is effectively solved, the moisture resistance, tensile strength and flexural strength of sand are improved, meanwhile, compositions are simple, the cost is low, defects of similar products are effectively overcome, and the bio-adhesive binder has wide market prospects.

Description

technical field [0001] The invention belongs to the technical field of bio-glue binders, in particular to a water-based polyurethane-modified bio-glue binder and a preparation method thereof. Background technique [0002] At present, the commonly used prior art in the industry is as follows: most of the binders commonly used in the market for molding materials are organic resin binders such as phenolic resins, furan resins, and the like. Organic resin itself contains harmful substances, causing great harm to the environment and society. The raw materials of some resins are extracted from petroleum. As the price of petroleum rises, the cost of resins also increases, which is greatly affected by market fluctuations. Every year, the molding and core making of the foundry industry consumes a huge amount of organic bonding materials, including phenolic resin, furan resin, cold box resin, etc., and the toxic and harmful substances released during the preparation and production pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/16B22C1/10
Inventor 唐倩范晨晨龚成斌彭敬东
Owner SOUTHWEST UNIV
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