Glyoxal-urea resin as well as preparation method and application thereof

Abstract

The invention relates to the technical field of new materials, and discloses glyoxal-urea resin as well as a preparation method and application thereof. The preparation method of the glyoxal-urea resin comprises the following steps: by taking a phthalic anhydride derivative, glyoxal and urea as monomers, carrying out copolycondensation to obtain the glyoxal-urea resin. The heat conductivity coefficient of the glyoxal-urea resin provided by the invention can reach 0.017 W / (m.K), and the glyoxal-urea resin has relatively high thermal insulation performance; the tensile strength of the glyoxal-urea resin provided by the invention can reach 34 MPa, the bending strength of the glyoxal-urea resin can reach 75 MPa, and the glyoxal-urea resin has relatively high mechanical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of new materials, and in particular to a glyoxal-urea resin and a preparation method and application thereof. Background Art

[0002] Against the backdrop of global advocacy for energy conservation, emission reduction and green development, the application of thermal insulation materials in the fields of construction, industrial pipelines, cold chain transportation, etc. has become increasingly critical. Resin-based thermal insulation materials have become a key research and development direction in the industry due to their strong plasticity and convenient processing. However, the thermal conductivity of traditional glyoxal-urea resins is relatively high and cannot meet the needs of efficient thermal insulation. In order to improve the thermal insulation properties of glyoxal-urea resins, those skilled in the art have tried to modify them by adding fillers, changing the cross-linking structure, etc. However, these methods have problems such as short-term modification effects, decreased mechanical properties of materials, and increased production costs, which limit their widespread application in the field of thermal insulation. Therefore, the development of a new type of glyoxal-urea resin with excellent thermal insulation properties has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0003] The purpose of the present invention is to provide a glyoxal-urea resin and a preparation method and application thereof.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] One of the technical solutions of the present invention:

[0006] A method for preparing a glyoxal-urea resin comprises the following steps:

[0007] The glyoxal-urea resin is obtained by co-condensing phthalic anhydride derivatives, glyoxal and urea as monomers.

[0008] Furthermore, the structural formula of the phthalic anhydride derivative is:

[0009]

[0010] Furthermore, the preparation method of the phthalic anhydride derivative comprises the following steps:

[0011] Phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione are placed in an organic solvent and reacted with ethylenediamine as a catalyst to obtain the phthalic anhydride derivative.

[0012] Furthermore, the molar ratio of the phenyldichlorosilane to 5,6-dihydroxyisobenzofuran-1,3-dione is 1:0.8.

[0013] Furthermore, the organic solvent is anhydrous acetone or anhydrous tetrahydrofuran.

[0014] Furthermore, the reaction is specifically carried out in a nitrogen atmosphere at room temperature for 12 hours.

[0015] In the present invention, the preparation formula of the phthalic anhydride derivative is as follows:

[0016]

[0017] Furthermore, the molar ratio of the phthalic anhydride derivative, glyoxal and urea is (0.05-0.15):1:(0.1-0.5).

[0018] Furthermore, the co-condensation is specifically:

[0019] Phthalic anhydride derivatives, glyoxal and urea are placed in an organic solvent, aluminum chloride is used as a catalyst, and co-condensed at 40-70°C for 30-90 minutes.

[0020] Furthermore, the organic solvent is N,N-dimethylacetamide or dimethyl sulfoxide.

[0021] The second technical solution of the present invention:

[0022] The glyoxal-urea resin prepared by the above-mentioned method for preparing glyoxal-urea resin.

[0023] The third technical solution of the present invention:

[0024] Application of the above-mentioned glyoxal-urea resin in coatings, packaging materials and building materials.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The glyoxal-urea resin provided by the present invention has a thermal conductivity of up to 0.017W / (m·K) and has high thermal insulation performance;

[0027] The glyoxal-urea resin provided by the present invention has a tensile strength of up to 34 MPa and a flexural strength of up to 75 MPa, and has relatively high mechanical properties. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention are now described in detail. This detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the present invention.

[0029] In addition, for numerical ranges in the present invention, it is understood that each intervening value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any stated value or intervening value in a stated range and any other stated value or intervening value in the stated range is also included in the present invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

[0030] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0031] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be exemplary only.

[0032] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0033] In the following examples, a method for preparing a glyoxal-urea resin comprises the following steps:

[0034] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in an organic solvent at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0035] Wherein, the organic solvent is anhydrous acetone or anhydrous tetrahydrofuran;

[0036] 2) placing the phthalic anhydride derivative (P), glyoxal (G) and urea (U) in an organic solvent at a molar ratio of (0.05-0.15) : 1 : (0.1-0.5), using aluminum chloride as a catalyst, and subjecting them to co-condensation at 40-70° C. for 30-90 minutes to obtain the glyoxal-urea resin;

[0037] Wherein, the organic solvent is N,N-dimethylacetamide or dimethyl sulfoxide.

[0038] Example 1

[0039] A glyoxal-urea resin

[0040] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0041] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) being 0.05:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.05 G1U 0.1 .

[0042] Example 2

[0043] A glyoxal-urea resin

[0044] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0045] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) being 0.07:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.07 G1U 0.1 .

[0046] Example 3

[0047] A glyoxal-urea resin

[0048] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0049] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) being 0.09:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.09 G1U 0.1 .

[0050] Example 4

[0051] A glyoxal-urea resin

[0052] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0053] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.11:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.11 G1U 0.1 .

[0054] Example 5

[0055] A glyoxal-urea resin

[0056] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0057] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.1 .

[0058] Example 6

[0059] A glyoxal-urea resin

[0060] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0061] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.15:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.15 G1U 0.1 .

[0062] Comparative Example 1

[0063] A glyoxal-urea resin

[0064] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0065] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) being 0.03:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the polycondensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.03 G1U 0.1 .

[0066] Comparative Example 2

[0067] A glyoxal-urea resin

[0068] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0069] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.17:1:0.1, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.17G1U 0.1 .

[0070] The thermal insulation performance of the glyoxal-urea resins prepared in Examples 1 to 6 and Comparative Examples 1 to 2 was tested. The results of the thermal insulation performance test are shown in Table 1.

[0071] Table 1 Thermal insulation performance test results

[0072]

[0073]

[0074] It can be seen from the data in Table 1 that with the increase in the amount of phthalic anhydride derivative added, the thermal conductivity of the prepared glyoxal-urea resin gradually decreases, which indicates that the thermal insulation performance of the glyoxal-urea resin gradually improves. However, with the excessive addition of phthalic anhydride derivatives, the thermal conductivity of the prepared glyoxal-urea resin gradually increases, which indicates that the thermal insulation performance of the glyoxal-urea resin gradually decreases.

[0075] Example 7

[0076] A glyoxal-urea resin

[0077] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0078] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.2, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.2 .

[0079] Example 8

[0080] A glyoxal-urea resin

[0081] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0082] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.3, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.3 .

[0083] Example 9

[0084] A glyoxal-urea resin

[0085] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0086] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.4, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.4 .

[0087] Example 10

[0088] A glyoxal-urea resin

[0089] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0090] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.5, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, aluminum chloride is used as a catalyst, and co-condensed at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.5 .

[0091] Comparative Example 3

[0092] A glyoxal-urea resin

[0093] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0094] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.05, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.05 .

[0095] Comparative Example 4

[0096] A glyoxal-urea resin

[0097] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0098] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.6, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, aluminum chloride is used as a catalyst, and co-condensed at 40°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.6 .

[0099] The thermal insulation performance of the glyoxal-urea resins prepared in Examples 7 to 10 and Comparative Examples 3 to 4 was tested. The results of the thermal insulation performance test are shown in Table 2.

[0100] Table 2 Thermal insulation performance test results

[0101]

[0102] It can be seen from the data in Table 2 that with the increase of the amount of urea added, the thermal conductivity of the prepared glyoxal-urea resin gradually decreases, which indicates that the thermal insulation performance of the glyoxal-urea resin gradually improves. However, with the excessive addition of urea, the thermal conductivity of the prepared glyoxal-urea resin gradually increases, which indicates that the thermal insulation performance of the glyoxal-urea resin gradually decreases.

[0103] Example 11

[0104] A glyoxal-urea resin

[0105] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0106] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.3, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 50°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.3 50.

[0107] Example 12

[0108] A glyoxal-urea resin

[0109] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0110] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.3, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 60°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.3 60.

[0111] Example 13

[0112] A glyoxal-urea resin

[0113] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0114] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) being 0.13:1:0.3, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, aluminum chloride is used as a catalyst, and co-condensed at 70°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.3 70.

[0115] Comparative Example 5

[0116] A glyoxal-urea resin

[0117] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0118] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.3, the phthalic anhydride derivative, glyoxal and urea were placed in N,N-dimethylacetamide, aluminum chloride was used as a catalyst, and co-condensed at 30°C for 60 minutes.

[0119] Due to the low co-condensation temperature, the preparation of glyoxal-urea resin cannot be achieved.

[0120] Comparative Example 6

[0121] A glyoxal-urea resin

[0122] 1) placing phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione in anhydrous tetrahydrofuran at a molar ratio of 1:0.8, using ethylenediamine as a catalyst, and reacting at room temperature for 12 hours in a nitrogen atmosphere to obtain a phthalic anhydride derivative;

[0123] 2) According to the molar ratio of phthalic anhydride derivative (P), glyoxal (G) and urea (U) of 0.13:1:0.3, the phthalic anhydride derivative, glyoxal and urea are placed in N,N-dimethylacetamide, and aluminum chloride is used as a catalyst, and the co-condensation is carried out at 80°C for 60 minutes to obtain the glyoxal-urea resin, which is recorded as P 0.13 G1U 0.3 80.

[0124] The thermal insulation performance of the glyoxal-urea resins prepared in Examples 11 to 13 and Comparative Example 6 was tested. The results of the thermal insulation performance test are shown in Table 3.

[0125] Table 3 Thermal insulation performance test results

[0126]

[0127] It can be seen from the data in Table 3 that a higher co-condensation temperature is beneficial to the thermal insulation performance of glyoxal-urea resin. However, too high a co-condensation temperature will reduce the thermal insulation performance of glyoxal-urea resin.

[0128] The P prepared in Example 11 0.13 G1U 0.3 50 for mechanical properties testing;

[0129] After inspection, P 0.13 G1U 0.3 The tensile strength of 50 is 34 MPa, and the flexural strength is 75 MPa, which shows that the glyoxal-urea resin provided by the present invention maintains higher mechanical properties on the basis of improving thermal insulation performance.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for preparing glyoxal-urea resin, characterized in that: The following steps are involved: The glyoxal-urea resin is obtained by co-condensing phthalic anhydride derivatives, glyoxal and urea as monomers.

2. A method for preparing glyoxal-urea resin according to claim 1, characterized in that, The structural formula of the phthalic anhydride derivative is:

3. A method for preparing glyoxal-urea resin according to claim 1, characterized in that, The preparation method of the phthalic anhydride derivative comprises the following steps: Phenyldichlorosilane and 5,6-dihydroxyisobenzofuran-1,3-dione are placed in an organic solvent and reacted with ethylenediamine as a catalyst to obtain the phthalic anhydride derivative.

4. A method for preparing glyoxal-urea resin according to claim 3, characterized in that, The molar ratio of the phenyldichlorosilane to 5,6-dihydroxyisobenzofuran-1,3-dione is 1:0.

8.

5. A method for preparing glyoxal-urea resin according to claim 3, characterized in that, The organic solvent is anhydrous acetone or anhydrous tetrahydrofuran.

6. A method for preparing glyoxal-urea resin according to claim 3, characterized in that, The reaction is specifically carried out in a nitrogen atmosphere at room temperature for 12 hours.

7. A method for preparing glyoxal-urea resin according to claim 1, characterized in that, The molar ratio of the phthalic anhydride derivative, glyoxal and urea is (0.05-0.15):1:(0.1-0.5).

8. A method for preparing glyoxal-urea resin according to claim 1, characterized in that, The co-condensation is specifically: Phthalic anhydride derivatives, glyoxal and urea are placed in an organic solvent, aluminum chloride is used as a catalyst, and co-condensed at 40-70°C for 30-90 minutes.

9. A method for preparing a glyoxal-urea resin according to claim 8, characterized in that, The organic solvent is N,N-dimethylacetamide or dimethyl sulfoxide.

10. A glyoxal-urea resin prepared by the method for preparing a glyoxal-urea resin according to any one of claims 1 to 8.

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