Dual catalyst system thermoplastic phenolic resin preparation method and application for preparing coated sand thereof

A phenolic resin and thermoplastic technology, which is applied in the field of preparation of thermoplastic phenolic resin for high-strength coated sand, can solve problems such as high softening point, slow polymerization speed, and increased gas generation, and achieve thermal tensile strength and normal temperature tensile strength High strength, low free phenol content, fast polymerization effect

Inactive Publication Date: 2010-01-06
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned resins used in the coated sand shell method have made some progress, their strength ...

Method used

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  • Dual catalyst system thermoplastic phenolic resin preparation method and application for preparing coated sand thereof
  • Dual catalyst system thermoplastic phenolic resin preparation method and application for preparing coated sand thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking 1 mole of raw material phenol for preparing thermoplastic phenolic resin as an example, other raw materials used and their proportioning and preparation methods are as follows:

[0027] 1. Ingredients

[0028] Take 94g of phenol, 19.52g of paraformaldehyde, 31.5g of water, 0.36g of oxalic acid, and 0.88g of zinc acetate, put them in a reaction kettle, and stir evenly, that is, the molar ratio of phenol to paraformaldehyde, water, oxalic acid, and zinc acetate is 1 : 0.65: 1.75: 0.004: 0.004, paraformaldehyde is a low molecular weight paraformaldehyde with a degree of polymerization of 8-100.

[0029] 2. Reflux reaction

[0030] The reactant was heated to 120° C. under stirring, and reacted at constant temperature for 4 hours.

[0031] 3. Vacuum drying

[0032] After the reaction, put the resultant into a vacuum oven with a vacuum degree of -0.07MPa, continue stirring and heating to 180° C. and vacuum dry for 4 hours to prepare a thermoplastic phenolic resin. ...

Embodiment 2

[0042] Taking 1 mole of raw material phenol for preparing thermoplastic phenolic resin as an example, other raw materials used and their proportioning and preparation methods are as follows:

[0043] In batching step 1, take 94g of phenol, 15.02g of paraformaldehyde, 0.09g of oxalic acid, and 0.22g of zinc acetate, place them in a reaction kettle, and stir evenly, that is, the molar ratio of phenol to paraformaldehyde, water, oxalic acid, and zinc acetate 1:0.50:0:0.001:0.001, paraformaldehyde is a low molecular weight paraformaldehyde with a degree of polymerization of 8-100. Other steps are the same as in Example 1 to prepare a thermoplastic phenolic resin.

Embodiment 3

[0045] Taking 1 mole of raw material phenol for preparing thermoplastic phenolic resin as an example, other raw materials used and their proportioning and preparation methods are as follows:

[0046] In batching step 1, take 94g of phenol, 27.03g of paraformaldehyde, 54.0g of water, 3.6g of oxalic acid, and 4.4g of zinc acetate, put them in the reaction kettle, stir evenly, that is, phenol and paraformaldehyde, water, oxalic acid, acetic acid The molar ratio of zinc is 1:0.90:3.0:0.04:0.02, and the paraformaldehyde is a low molecular weight paraformaldehyde with a polymerization degree of 8-100. The other steps are the same as in Example 1 to prepare a thermoplastic phenolic resin.

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Abstract

A dual catalyst system thermoplastic phenolic resin preparation method comprises the steps of proportioning, refluxing and reacting, and drying; the raw materials comprises phenol or m-cresol and aldehydes compound, water, organic acid or inorganic acid and bivalent acetate in a molar ratio of 1:0.5-0.9:0-3.0:0.001-0.040:0.001-0.020; wherein, acetate is used as first catalyst and organic acid or inorganic acid is used as second catalyst in reaction process. The invention adopts phenolic aldehyde addition-condensation reaction in dual catalyst system to prepare the thermoplastic phenolic resin; the method has the advantage of rapid polymerization rate, high yield and low content of free phenols; the thermoplastic phenolic resin can be applied for preparing the coated sand and the prepared coated sand has higher hot tensile strength and tensile strength at room temperature.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a thermoplastic phenolic resin for high-strength coated sand. Background technique [0002] Thermoplastic phenolic resin has a high carbon residue rate and low production cost, and is widely used in the shell process. The existing method for synthesizing thermoplastic phenolic resin is that formaldehyde and excess phenol are under the action of acid catalysis, and the ortho-position or para-position of formaldehyde and phenol undergoes an addition reaction to obtain a hydroxymethylphenol. The unreacted hydrogen atoms in the ortho position on the phenol molecule undergo dehydration condensation reaction and are connected by methine bridges to form a linear thermoplastic phenolic resin. The phenolic resin prepared by this method has high content of free phenol, slow polymerization speed, and low shell strength when used for molding coated sand...

Claims

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Application Information

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IPC IPC(8): C08G8/10C08G8/22B22C1/22
Inventor 董文生刘春玲梁铣潘艳平
Owner SHAANXI NORMAL UNIV
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