Paperless protection film

Abstract

The application discloses a kind of thermal insulation cotton felt, the thermal insulation cotton felt is formed by the glass fiber that is sprayed with adhesive solidification and drying;Adhesive is composed of the following components by weight parts: modified phenolic resin solution, methyl methacrylate prepolymers liquid modified by silicone, water, pentaerythritol, methyl emulsified silicone oil, dioctyl phthalate;Modified phenolic resin solution is obtained by the following steps: in the mixed solution consisting of phenol, dimethyl phenol, lignin, add formaldehyde, and obtain first solution under the condition of temperature 40~60 ℃ reaction;5~15 weight parts of sodium hydroxide solution is added in first solution to adjust the pH value of first solution to 8~9, and after heating, temperature is reduced to 35~50 ℃, add sulfuric acid and stir to obtain second solution;20~40 portions of hexamethylol melamine are added in second solution in batches.The thermal insulation cotton felt of the application improves the hydrophobic property of thermal insulation and sound insulation module while maintaining the resilience of glass fiber cotton felt.

Description

Technical Field

[0001] The invention relates to the field of heat insulation and sound insulation, and in particular to a protective film without a backing paper. 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 bottom paper-free protective film, 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°, and the hydrophobicity of the glass fiber wool felt reaches 99%. It has excellent hydrophobicity and meets the indicators of large commercial aircraft.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a heat-insulating cotton felt, which is formed by curing and drying glass fibers sprayed with an adhesive; The adhesive is composed of the following components in parts by weight: 100 parts of modified phenolic resin solution, 32 parts of organosilicon-modified methyl methacrylate prepolymer solution, 350 parts of water, 8 parts of pentaerythritol, 4 parts of methyl emulsified silicone oil, and 12 parts of dioctyl phthalate; The modified phenolic resin solution is obtained by the following steps: Step 1, adding 250 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.

[0005] The technical solution further improved in the above technical solution is as follows: 1. In the above scheme, in step 3 of the modified phenolic resin solution, hexahydroxymethyl melamine is added to the second solution in at least three batches and stirred.

[0006] 2. In the above scheme, the weight portion of hexahydroxymethylmelamine is 25 parts.

[0007] 3. In the above scheme, the organic solvent is at least one of N,N-dimethylformamide, ethanol, methanol and toluene.

[0008] 4. In the above scheme, the mass ratio of methyl methacrylate, deionized water and initiator is 150:18:12.

[0009] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. The heat-insulating wool felt of the present invention has a glass fiber wool felt surface sprayed with an adhesive, wherein 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 heat-insulating and sound-insulating 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, reaching the index of large commercial aircraft.

[0010] 2. The heat-insulating felt of the present invention has an adhesive containing a prepolymer of methyl methacrylate modified with silicone, 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 for 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

[0011] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0012] The present invention will be further described below in conjunction with embodiments: Embodiment: A protective film without a backing paper, wherein the heat insulating cotton felt is formed by curing and drying glass fibers sprayed with an adhesive; The adhesive is composed of the following components in parts by weight: 100 parts of modified phenolic resin solution, 32 parts of silicone-modified methyl methacrylate prepolymer solution, 350 parts of water, 8 parts of pentaerythritol, 4 parts of methyl emulsified silicone oil, and 12 parts of dioctyl phthalate; The modified phenolic resin solution is obtained by the following steps: Step 1, adding formaldehyde to 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 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; Step 3, adding hexahydroxymethyl melamine in equal amounts to the second solution in three batches to obtain the modified phenolic resin solution; The modified phenolic resin solution is composed of the following components in parts by weight, as shown in Table 1: Table 1 Components Example phenol 75 servings Xylenol 25 servings Lignin 8 servings formaldehyde 250 copies Sodium hydroxide 8 servings sulfuric acid 8 servings Hexamethylolmelamine 25 servings ; 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; The organosilicon-modified methyl methacrylate prepolymer solution is obtained by the following steps: adding 150 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 evenly, and then adding deionized water and an initiator to obtain the solution, as shown in Table 2: Table 2 Components Example Tetraethyl orthosilicate 40 servings Silane coupling agent 20 servings Organic solvents 40 servings Methyl Methacrylate 150 copies Deionized water 18 servings Azobisisobutyronitrile 12 servings ; 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.

[0013] Comparative Examples 1-3: A heat and sound insulation module, formed by curing and drying glass fibers sprayed with an adhesive; The adhesive is composed of the following components in parts by weight: Table 3 Components Comparative Example 1 Comparative Example 2 Comparative Example 3 Phenolic resin solution 100 copies 100 copies 100 copies Silicone modified methyl methacrylate prepolymer 28 servings 28 servings - 300~500 parts water 400 copies 400 copies 400 copies Pentaerythritol 8 servings 8 servings 8 servings Methyl silicone emulsion 2.5 servings 2.5 servings 2.5 servings Dioctyl phthalate 12 servings 12 servings 12 servings The phenolic resin solution is composed of the following components in parts by weight, as shown in Table 4: Table 4 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 ; The preparation process of the phenolic resin solution is the same as that in the embodiment.

[0014] The properties of the glass fiber felts of the heat insulation and sound insulation modules obtained in the above examples and comparative examples 1 to 3 are shown in Table 5: Table 5 Test items Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Contact angle of glass fiber felt (GB / T10299-2011) 142° 114° 112° 119°

[0015] As shown in the evaluation results of Table 5, 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 felt having a poorer water repellency than that of the embodiment of the present invention. The contact angle of the glass fiber felt in the embodiment of the present invention reaches 143°, and the water repellency of the glass fiber felt reaches 99%, which is water repellent. It has excellent performance and has reached the standards of large commercial aircraft.

[0016] 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 protective film without liner, characterized in that: The thermal insulation felt is formed by curing and drying glass fibers sprayed with adhesive; The adhesive is composed of the following components in parts by weight: 100 parts of modified phenolic resin solution, 32 parts of organosilicon-modified methyl methacrylate prepolymer solution, 350 parts of water, 8 parts of pentaerythritol, 4 parts of methyl emulsified silicone oil, and 12 parts of dioctyl phthalate; The modified phenolic resin solution is obtained by the following steps: Step 1, adding 250 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 bottom paper-less protective film according to claim 1, characterized in that: In step 3 of modifying the phenolic resin solution, hexahydroxymethylmelamine is added to the second solution in at least three batches and stirred.

3. The bottom paper-less protective film according to claim 2, characterized in that: The weight portion of the hexamethylolmelamine is 25 parts.

4. The bottom paper-less protective film according to claim 1, characterized in that: The organic solvent is at least one of N,N-dimethylformamide, ethanol, methanol and toluene.

5. The bottom paper-less protective film according to claim 1, characterized in that: The mass ratio of the methyl methacrylate, deionized water and initiator is 150:18:12.