Glass fiber wool felt

Abstract

The application discloses a glass fiber cotton felt, and relates to the technical field of thermal and sound insulation materials. The glass fiber cotton felt is obtained by spraying an adhesive on glass fibers, curing and drying. A modified phenolic resin solution is obtained by the following steps: adding 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixed solution composed of phenol, dimethyl phenol and lignin, and reacting at a temperature of 40-60 DEG C to obtain a first solution, wherein the weight ratio of the phenol, dimethyl phenol and lignin is 10:2-4:1-8. An organic silicon modified methyl methacrylate prepolymer solution is obtained by the following steps: adding 100-200 parts by weight of methyl methacrylate to 100 parts by weight of a mixed solution composed of a silicon source and an organic solvent, uniformly stirring, and then adding deionized water and an initiator. The glass fiber cotton felt of the application has excellent hydrophobic performance, and the hydrophobic rate of the glass fiber cotton felt reaches 99% while the resilience of the glass fiber cotton felt is maintained.

Description

Technical Field

[0001] The invention relates to the field of heat insulation and sound insulation, and in particular to a glass fiber wool felt. Background Art

[0002] Commercial large aircraft install a sound insulation and insulation sealing bag between the cabin interior decoration layer and the fuselage skin. The material has the functions of heat insulation, sound insulation, flame retardancy and insulation. The aircraft inner wall sealing bag is prepared by filling a film bag with glass fiber felt and then ultrasonically heat-sealing the film bag body. The existing heat insulation and sound insulation module is easily affected by moisture over time, which affects its performance and needs further improvement. Summary of the invention

[0003] The purpose of the present invention is to provide a glass fiber wool felt, which maintains the resilience of the glass fiber wool felt while improving the hydrophobicity of the thermal insulation and sound insulation module, so that the contact angle of the glass fiber wool felt reaches 143°, the hydrophobicity of the glass fiber wool felt reaches 99%, and the hydrophobicity is excellent, reaching the indicators of large commercial aircraft.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a glass fiber wool felt, the heat-insulating and sound-insulating wool felt is formed by curing and drying glass fiber sprayed with an adhesive, the adhesive is composed of the following components in parts by weight: 100 parts of modified phenolic resin solution, 38 parts of silicone-modified methyl methacrylate prepolymer solution, 350 parts of water, 10 parts of pentaerythritol, 3 parts of methyl emulsified silicone oil, and 10 parts of dioctyl phthalate;

[0005] The modified phenolic resin solution is obtained by the following steps:

[0006] Step 1, adding 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixed solution consisting of phenol, xylenol and lignin, and reacting at a temperature of 40-60° C. to obtain a first solution, wherein the weight ratio of the phenol, xylenol and lignin is 10:2-4:1-8;

[0007] Step 2, adding 5 to 15 parts by weight of an aqueous sodium hydroxide solution to the first solution to adjust the pH value of the first solution to 8 to 9, heating the solution to 75 to 85° C. and keeping the temperature for 1 to 2 hours, then cooling the solution to 35 to 50° C., adding 4 to 8 parts by weight of sulfuric acid and stirring the solution to obtain a second solution;

[0008] Step 3, adding 20 to 40 parts of hexahydroxymethyl melamine to the second solution in batches to obtain the modified phenolic resin solution;

[0009] The organosilicon-modified methyl methacrylate prepolymer solution is obtained by the following steps: adding 100 to 200 parts by weight of methyl methacrylate to 100 parts by weight of a mixed solution consisting of a silicon source and an organic solvent, stirring the mixture evenly, and then adding deionized water and an initiator to obtain the prepolymer solution.

[0010] The technical solution further improved in the above technical solution is as follows:

[0011] 1. In the above scheme, the coupling agent is selected from KH550, KH560, KH570 or KH792.

[0012] 2. In the above scheme, in step 3 of the modified phenolic resin solution, 20 to 40 parts of hexahydroxymethyl melamine are added to the second solution in at least three batches and stirred.

[0013] 3. In the above scheme, the silicon source is a mixture of tetraethyl orthosilicate and a silane coupling agent, wherein the weight ratio of the tetraethyl orthosilicate to the silane coupling agent is 1 to 3:1.

[0014] 4. In the above scheme, the organic solvent is at least one of N,N-dimethylformamide, ethanol, methanol and toluene.

[0015] 5. In the above scheme, the initiator is azobisisobutyronitrile.

[0016] 6. In the above scheme, the mass ratio of methyl methacrylate, deionized water and initiator is 10:0.5~2:0.5~2.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0018] 1. The glass fiber wool felt of the present invention has an adhesive sprayed on its surface. The adhesive is a composite adhesive, which includes lignin and hexahydroxymethyl melamine-modified phenolic resin solution and silicone-modified methyl methacrylate prepolymer solution. While maintaining the resilience of the glass fiber wool felt, the hydrophobicity of the thermal insulation and sound insulation module is improved, so that the contact angle of the glass fiber wool felt reaches 143°, and the hydrophobicity of the glass fiber wool felt reaches 99%. The hydrophobicity is excellent and meets the indicators of large commercial aircraft.

[0019] 2. The glass fiber felt of the present invention has an adhesive containing silicone-modified methyl methacrylate prepolymer, which has the characteristics of low surface energy, dust resistance, high temperature resistance and ultra-low temperature resistance, and is very soft. It is used in glass fiber adhesives, and the adhesive for making loose ultra-fine glass fibers into glass fiber felt requires the above-mentioned properties of silicone, high and low temperature resistance (aircraft need to meet the requirements of -60° to +80°), low surface energy and dust resistance. DETAILED DESCRIPTION

[0020] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0021] The present invention will be further described below in conjunction with embodiments:

[0022] Embodiment: A glass fiber wool felt, the heat and sound insulation wool felt is formed by curing and drying glass fiber sprayed with an adhesive, the adhesive is composed of the following components in parts by weight: 100 parts of modified phenolic resin solution, 38 parts of silicone-modified methyl methacrylate prepolymer solution, 350 parts of water, 10 parts of pentaerythritol, 3 parts of methyl emulsified silicone oil, and 10 parts of dioctyl phthalate;

[0023] The modified phenolic resin solution is obtained by the following steps:

[0024] Step 1, adding formaldehyde to a mixed solution consisting of phenol, xylenol and lignin, and reacting at a temperature of 40 to 60° C. to obtain a first solution, wherein the weight ratio of the phenol, xylenol and lignin is 10:2 to 4:1 to 8;

[0025] Step 2, adding sodium hydroxide aqueous solution to the first solution to adjust the pH value of the first solution to 8-9, heating the solution to 75-85° C. and keeping the temperature for 1-2 hours, then cooling the solution to 35-50° C., adding sulfuric acid and stirring to obtain a second solution;

[0026] Step 3, adding hexahydroxymethyl melamine in equal amounts to the second solution in three batches to obtain the modified phenolic resin solution;

[0027] The modified phenolic resin solution is composed of the following components in parts by weight: 82 parts of phenol, 18 parts of xylenol, 15 parts of lignin, 200 parts of formaldehyde, 10 parts of sodium hydroxide, 5 parts of sulfuric acid, and 25 parts of hexamethylolmelamine;

[0028] The modified phenolic resin solution, the silicone-modified methyl methacrylate prepolymer solution, water, pentaerythritol, methyl emulsified silicone oil and dioctyl phthalate are mixed and stirred to form the adhesive;

[0029] The organosilicon-modified methyl methacrylate prepolymer liquid is obtained by the following steps: adding 150 parts by weight of methyl methacrylate to 100 parts by weight of a mixed liquid consisting of a silicon source and an organic solvent, stirring evenly, and then adding deionized water and an initiator to obtain the organosilicon-modified methyl methacrylate prepolymer liquid, which is composed of the following components in parts by weight: 25 parts of tetraethyl orthosilicate, 15 parts of a silane coupling agent, 60 parts of an organic solvent, 120 parts of methyl methacrylate, 10 parts of deionized water, and 10 parts of azobisisobutyronitrile;

[0030] The modified phenolic resin solution, silicone-modified methyl methacrylate prepolymer solution, water, pentaerythritol, methyl emulsified silicone oil and dioctyl phthalate are mixed and stirred to form the adhesive.

[0031] Comparative Examples 1 to 3: A heat-insulating and sound-insulating module, formed by curing and drying glass fibers sprayed with an adhesive; the adhesive is composed of the following components in parts by weight, as shown in Table 1:

[0032] Table 1

[0033]

[0034] The phenolic resin solution is composed of the following components in parts by weight, as shown in Table 2:

[0035] Table 2

[0036] Components Comparative Example 1 Comparative Example 2 Comparative Example 3 phenol 82 copies 82 copies 82 copies Xylenol 18 servings 18 servings 18 servings Lignin - 15 servings 15 servings formaldehyde 200 copies 200 copies 200 copies Sodium hydroxide 10 servings 10 servings 10 servings sulfuric acid 5 servings 5 servings 5 servings Hexamethylolmelamine 25 servings - 25 servings ;

[0037] The preparation process of the phenolic resin solution is the same as that in the embodiment.

[0038] The properties of the glass fiber felts obtained in Examples 1 to 4 and Comparative Examples 1 to 3 are shown in Table 3:

[0039] Table 3

[0040]

[0041] As shown in the evaluation results of Table 3, the phenolic resin solution in Comparative Example 1 lacks lignin, the phenolic resin solution in Comparative Example 2 lacks hexahydroxymethyl melamine, and the adhesive in Comparative Example 3 lacks silicone-modified methyl methacrylate prepolymer liquid, resulting in the glass fiber wool felt having a worse water repellency performance than that of the embodiment of the present invention. The contact angle of the glass fiber wool felt in the embodiment of the present invention reaches 143°, and the water repellency of the glass fiber wool felt reaches 99%, with excellent water repellency, which meets the indicators of large commercial aircraft.

[0042] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A glass fiber felt, characterized in that: The heat-insulating and sound-insulating felt is formed by curing and drying glass fibers sprayed with an adhesive, wherein the adhesive is composed of the following components in parts by weight: 100 parts of a modified phenolic resin solution, 38 parts of a silicone-modified methyl methacrylate prepolymer solution, 350 parts of water, 10 parts of pentaerythritol, 3 parts of methyl emulsified silicone oil, and 10 parts of dioctyl phthalate; The modified phenolic resin solution is obtained by the following steps: Step 1, adding 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixed solution consisting of phenol, xylenol and lignin, and reacting at a temperature of 40-60° C. to obtain a first solution, wherein the weight ratio of the phenol, xylenol and lignin is 10:2-4:1-8; Step 2, adding 5 to 15 parts by weight of an aqueous sodium hydroxide solution to the first solution to adjust the pH value of the first solution to 8 to 9, heating the solution to 75 to 85° C. and keeping the temperature for 1 to 2 hours, then cooling the solution to 35 to 50° C., adding 4 to 8 parts by weight of sulfuric acid and stirring the solution to obtain a second solution; Step 3, adding 20 to 40 parts of hexamethylol melamine in batches to the second solution to obtain the modified phenolic resin solution; The organosilicon-modified methyl methacrylate prepolymer solution is obtained by the following steps: adding 100 to 200 parts by weight of methyl methacrylate to 100 parts by weight of a mixed solution consisting of a silicon source and an organic solvent, stirring the mixture evenly, and then adding deionized water and an initiator to obtain the prepolymer solution; The silicon source is formed by mixing tetraethyl orthosilicate and a silane coupling agent, wherein the weight ratio of the tetraethyl orthosilicate to the silane coupling agent is 1-3:

1.

2. The glass fiber felt according to claim 1, characterized in that: In step 3 of the modified phenolic resin solution, 20 to 40 parts of hexahydroxymethyl melamine are added to the second solution in at least three batches and stirred.

3. The glass fiber felt according to claim 1, characterized in that: The initiator is azobisisobutyronitrile.