Fructose-modified furan resin for casting and preparation method thereof

Abstract

The invention belongs to the technical field of casting auxiliary materials, in particular to a fructose-modified furan resin for casting and a preparation method thereof. The chemical composition of the raw materials used in the furan resin is calculated in parts by mass, specifically 30-40 parts of fructose, 130-180 parts of furfuryl alcohol, 15-20 parts of tetraethylammonium bromide, 0.2-0.4 parts of chromium trichloride, liquid urea-formaldehyde 5-20 parts of resin, 30-40 parts of water and 1-2 parts of formic acid; the water content of the liquid urea-formaldehyde resin is less than 30%. The present invention uses the water-furfuryl alcohol system as the fructose hydrolysis solvent, so that the hydrolyzed product can be directly used in the subsequent production of furan resin, replacing furfuryl alcohol, effectively reducing the preparation cost of furan resin; by adding catalyst trichlorination to the reaction system Chromium can effectively avoid the self-polymerization reaction of furfuryl alcohol in the first step of the reaction, and improve the reaction efficiency; the present invention can greatly improve the conversion rate of fructose by introducing tetraethylammonium bromide as a phase transfer agent; Production Process.

Description

technical field

[0001] The invention belongs to the technical field of casting auxiliary materials, and in particular relates to a fructose-modified furan resin for casting and a preparation method thereof. Background technique

[0002] The main raw material of furan resin is furfuryl alcohol, which is obtained by hydrogenation of furfural. Furfural is obtained by hydrolyzing corncobs, with low yield and heavy pollution. Therefore, the price of furfuryl alcohol remains high. Fructose can be hydrolyzed under acidic conditions to produce 5-hydroxymethylfurfural, which is very similar in structure to furfuryl alcohol, and has an extra aldehyde group, which has higher reactivity. Fructose can be obtained by microbial fermentation and hydrolysis of starch. It has a wide range of sources and a high yield. Therefore, fructose hydrolyzate can be used to partially replace furfuryl alcohol, which can not only reduce the cost of the resin but also improve the activity of the resin, a...

Examples

Embodiment 1

[0025] The resin preparation process is as follows:

[0026] (1) Add 30g of fructose, 30g of water and 90g of furfuryl alcohol into a 500ml three-necked flask;

[0027] (2) Add 15 g of tetraethylammonium bromide, add 0.2 g of chromium trichloride, heat up to 95 ° C, and keep warm for 60 min;

[0028] (3) Add 5 g of liquid urea-formaldehyde resin and 1 g of formic acid, and continue the reaction at 95° C. for 30 min;

[0029] (4) After dehydrating 20 g, add 40 g of furfuryl alcohol; cool down to room temperature, and filter to obtain the fructose-modified furan resin of the present invention.

[0030] The obtained resin was tested for tensile strength according to the industry standard "J / BT 7526-2008 Furan Resin for Casting", and the 24h tensile strength was 1.62MPa, meeting the standard requirements.

Embodiment 2

[0032] The resin preparation process is as follows:

[0033] (1) Add 35g of fructose, 35g of water and 100g of furfuryl alcohol into a 500ml three-necked flask;

[0034] (2) Add 18g of tetraethylammonium bromide, add 0.2g of chromium trichloride, heat up to 100°C, and keep warm for 80min;

[0035] (3) Add 10 g of liquid urea-formaldehyde resin and 1.5 g of formic acid, and continue the reaction at 100° C. for 40 min;

[0036] (4) After dehydrating 25 g, add 50 g of furfuryl alcohol; cool down to room temperature, and filter to obtain the fructose-modified furan resin of the present invention.

[0037] The tensile strength of the obtained resin was measured according to the industry standard "J / BT 7526-2008 Furan Resin for Casting". The 24h tensile strength was 1.73MPa, meeting the standard requirements.

Embodiment 3

[0039] The resin preparation process is as follows:

[0040] (1) Add 40g of fructose, 40g of water and 120g of furfuryl alcohol into a 500ml three-necked flask;

[0041] (2) Add 20 g of tetraethyl ammonium bromide, add 0.4 g of chromium trichloride, heat up to 102° C., and keep the temperature for 90 min;

[0042] (3) Add 20g of liquid urea-formaldehyde resin and 1.5g of formic acid, and continue for 40min at 102°C;

[0043] (4) After dehydrating 30 g, add 60 g of furfuryl alcohol; cool down to room temperature, and filter to obtain the fructose-modified furan resin of the present invention.

[0044] The obtained resin was tested for tensile strength according to the industry standard "J / BT 7526-2008 Furan Resin for Casting", and the 24h tensile strength was 1.81MPa, meeting the standard requirements.

technical field

[0001] The invention belongs to the technical field of casting auxiliary materials, and in particular relates to a fructose-modified furan resin for casting and a preparation method thereof. Background technique

[0002] The main raw material of furan resin is furfuryl alcohol, which is obtained by hydrogenation of furfural. Furfural is obtained by hydrolyzing corncobs, with low yield and heavy pollution. Therefore, the price of furfuryl alcohol remains high. Fructose can be hydrolyzed under acidic conditions to produce 5-hydroxymethylfurfural, which is very similar in structure to furfuryl alcohol, and has an extra aldehyde group, which has higher reactivity. Fructose can be obtained by microbial fermentation and hydrolysis of starch. It has a wide range of sources and a high yield. Therefore, fructose hydrolyzate can be used to partially replace furfuryl alcohol, which can not only reduce the cost of the resin but also improve the activity of the resin, a...

Examples

Embodiment 1

[0025] The resin preparation process is as follows:

[0026] (1) Add 30g of fructose, 30g of water and 90g of furfuryl alcohol into a 500ml three-necked flask;

[0027] (2) Add 15 g of tetraethylammonium bromide, add 0.2 g of chromium trichloride, heat up to 95 ° C, and keep warm for 60 min;

[0028] (3) Add 5 g of liquid urea-formaldehyde resin and 1 g of formic acid, and continue the reaction at 95° C. for 30 min;

[0029] (4) After dehydrating 20 g, add 40 g of furfuryl alcohol; cool down to room temperature, and filter to obtain the fructose-modified furan resin of the present invention.

[0030] The obtained resin was tested for tensile strength according to the industry standard "J / BT 7526-2008 Furan Resin for Casting", and the 24h tensile strength was 1.62MPa, meeting the standard requirements.

Embodiment 2

[0032] The resin preparation process is as follows:

[0033] (1) Add 35g of fructose, 35g of water and 100g of furfuryl alcohol into a 500ml three-necked flask;

[0034] (2) Add 18g of tetraethylammonium bromide, add 0.2g of chromium trichloride, heat up to 100°C, and keep warm for 80min;

[0035] (3) Add 10 g of liquid urea-formaldehyde resin and 1.5 g of formic acid, and continue the reaction at 100° C. for 40 min;

[0036] (4) After dehydrating 25 g, add 50 g of furfuryl alcohol; cool down to room temperature, and filter to obtain the fructose-modified furan resin of the present invention.

[0037] The tensile strength of the obtained resin was measured according to the industry standard "J / BT 7526-2008 Furan Resin for Casting". The 24h tensile strength was 1.73MPa, meeting the standard requirements.

Embodiment 3

[0039] The resin preparation process is as follows:

[0040] (1) Add 40g of fructose, 40g of water and 120g of furfuryl alcohol into a 500ml three-necked flask;

[0041] (2) Add 20 g of tetraethyl ammonium bromide, add 0.4 g of chromium trichloride, heat up to 102° C., and keep the temperature for 90 min;

[0042] (3) Add 20g of liquid urea-formaldehyde resin and 1.5g of formic acid, and continue for 40min at 102°C;

[0043] (4) After dehydrating 30 g, add 60 g of furfuryl alcohol; cool down to room temperature, and filter to obtain the fructose-modified furan resin of the present invention.

[0044] The obtained resin was tested for tensile strength according to the industry standard "J / BT 7526-2008 Furan Resin for Casting", and the 24h tensile strength was 1.81MPa, meeting the standard requirements.