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Alkaline phenol formaldehyde resin for 3D printing, and preparation method thereof

A 3D printing and phenolic resin technology, applied in the field of alkaline phenolic resin for 3D printing and its preparation, can solve the problems of low strength, high viscosity, hindering the application of alkaline phenolic resin, etc., and achieve the effect of meeting the use requirements

Active Publication Date: 2015-08-05
NINGXIA KOCEL MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, it has been widely used in the field of casting, especially in the field of thin-walled steel castings. However, traditional basic phenolic resins generally have the problems of high viscosity and low strength. However, 3D printing requires resins with low viscosity and fast hardening. Molding sand strength, but the traditional basic phenolic resin cannot meet the needs of 3D printing, and also directly hinders the application of basic phenolic resin in the high-end casting field
At present, there are some modified invention patents for phenolic resins in China, focusing on improving the shelf life of phenolic resins and the moisture resistance of resins, but there is little research on the field of rapid hardening of low-viscosity basic phenolic resins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The raw materials of the basic phenolic resin for 3D printing in this embodiment are: furfuryl alcohol 12%, phenol 31%, cresol 14%, formaldehyde 14%, propylene glycol methyl ether 15%, sodium hydroxide 13%, modifier 0.5%, Coupling agent 0.5%.

Embodiment 3

[0027] The preparation method of the alkaline phenolic resin for 3D printing in this embodiment is as follows:

[0028] Step 1: Put 31% of molten phenol, 14% of cresol, 14% of formaldehyde, and 6% of furfuryl alcohol into the reactor according to a certain proportion, add 13% of sodium hydroxide, turn on the stirring, enter the steam pressure of 0.1-0.2MPa, and the reaction temperature At 60-130℃;

[0029] Step 2: Add 6% furfuryl alcohol to the polymer produced in the first step, and steam it for 1h-3h;

[0030] Step 3: After the heat preservation reaction for 1h-3h, transfer to a vacuum distillation kettle, under the conditions of temperature 60℃-80℃, vacuum degree -0.05MPa-0.07MPa, vacuum distillation dehydration for 1h-2h;

[0031] Step 4: Reduce to room temperature, add 15% of propylene glycol methyl ether, 0.5% of modifier, and 0.5% of coupling agent and stir evenly to obtain alkaline phenolic resin for 3D printing.

[0032] The basic phenolic resin prepared by this preparation me...

Embodiment 2

[0034] The raw materials of the basic phenolic resin for 3D printing in this embodiment are: furfuryl alcohol 14%, phenol 28%, cresol 17%, formaldehyde 12.5%, propylene glycol methyl ether 14.5%, sodium hydroxide 13%, modifier 0.4%, Coupling agent 0.6%.

[0035] The preparation method of the alkaline phenolic resin for 3D printing in this embodiment is as follows:

[0036] Step 1: Put 28% of molten phenol, 17% of cresol, 12.5% ​​of formaldehyde, and 8% of furfuryl alcohol into the reactor according to a certain proportion, add 13% of sodium hydroxide, turn on the stirring, enter the steam pressure of 0.1-0.2MPa, and the reaction temperature At 60-130℃;

[0037] Step 2: Add 6% furfuryl alcohol to the polymer produced in the first step, and steam it for 1h-3h;

[0038] Step 3: After the heat preservation reaction for 1h-3h, transfer to a vacuum distillation kettle, under the conditions of temperature 60℃-80℃, vacuum degree -0.05MPa-0.07MPa, vacuum distillation dehydration for 1h-2h;

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Abstract

The present invention relates to an alkaline phenol formaldehyde resin for 3D printing, and a preparation method thereof, wherein the alkaline phenol formaldehyde resin comprises cresol, phenol, furfuryl alcohol, formaldehyde, propylene glycol methyl ether, sodium hydroxide, a coupling agent, and a modifier. According to the present invention, the large viscosity characteristic of the conventional alkaline phenol formaldehyde resin is removed in the alkaline phenol formaldehyde resin of the present invention, wherein the resin viscosity is controlled to equal to or less than 20 mpa.s (25 DEG C); the process resin is added with the right amount of modifier, such that the free formaldehyde content and the free phenol content in the resin can be effectively reduced and can be reduced to equal to or less than 0.1% so as to provide the mild property for the on-site work environment and so as not to produce the adverse reaction for people; and with the special synthesis and reaction conditions of the process, the prepared resin can achieve rapid hardening, the mold sand usable time is less than 2 min (25 DEG C), the 24 h mold sand tensile strength is more than or equal to 1.2 MPa, the modeling can be performed on the high heat resistance and high hardness sand mold, and the use requirement of the 3D printing technology can be completely met.

Description

Technical field [0001] The invention relates to the field of casting auxiliary materials, in particular to an alkaline phenolic resin for 3D printing and a preparation method thereof. Background technique [0002] Three Dimensional Printing (3DP) was proposed by E. Sachs et al. in 1992. According to the principle of an inkjet printer, droplets of material are ejected from a nozzle and solidified layer by layer according to a certain path. [0003] 3D printing technology, together with robots and the Internet, is known as the main symbol of the third industrial revolution. At present, some industrial-grade 3D printers have been used in casting production services, mainly used for rapid prototyping of castings, reworking molds, printing mold shells, and sand cores. [0004] Alkaline phenolic resin has the following advantages: [0005] (1) The smoke emitted during sand mixing, modeling and pouring is less than furan resin sand with acid as hardener, resol sand with acid as hardener and...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08G8/10B33Y70/00
Inventor 方建涛荆金龙张茜
Owner NINGXIA KOCEL MOLD
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