CN114149655B - High foaming sound insulation resin lining and nylon skeleton using the same - Google Patents
High foaming sound insulation resin lining and nylon skeleton using the same Download PDFInfo
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- CN114149655B CN114149655B CN202111479133.8A CN202111479133A CN114149655B CN 114149655 B CN114149655 B CN 114149655B CN 202111479133 A CN202111479133 A CN 202111479133A CN 114149655 B CN114149655 B CN 114149655B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/35—Composite foams, i.e. continuous macromolecular foams containing discontinuous cellular particles or fragments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J9/0085—Use of fibrous compounding ingredients
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- C—CHEMISTRY; METALLURGY
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/02—Copolymers with acrylonitrile
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- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
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Abstract
The application relates to a high-foaming sound-insulation resin lining, which is formed by pressing double-layer core-shell particles, wherein the double-layer core-shell particles comprise an inner core body and an outer shell, the core body is particles prepared by mainly mixing epoxy resin, nitrile rubber, a foaming agent and a processing aid, and the particle size of the core body is 0.1-1.5 mm; the shell is a thin layer mainly made of epoxy resin, thermoplastic resin, reinforcing fibers, foaming agent and processing aid, and the thickness of the shell is 0.1-1 mm. The resin lining has good sound absorption and insulation properties and high mechanical strength through the double-layer core-shell structure and the application of the material thereof.
Description
Technical Field
The application relates to the technical field of automobile sound insulation materials, in particular to a high-foaming sound insulation resin lining and a nylon framework using the same.
Background
In the automobile manufacturing industry, in order to realize the lightweight of car, the automobile body sheet metal component is all designed to well cavitation structure, consequently, in order to improve the quietness and the travelling comfort of car, generally can paste the sound absorbing material in the cavity department of sheet metal component to improve the NVH performance of car.
Resin foam materials are used as structural materials for automobile parts as replacement materials for existing solid resin materials or metal materials; the resin foam material has the characteristics of low density, high heat insulation and buffering property, so that the resin foam material is effectively utilized. With the increasing demand for reducing acceleration noise in recent years, the existing sound-insulating resin materials are all of a single-layer foam structure with fixed porosity, and have the disadvantages of narrow sound absorption frequency range and poor sound-insulating effect. Some foaming materials foam the foaming materials into a communicated bubble structure so as to improve the sound absorption and sound insulation performance of the foaming body, but the foaming materials with the structure have poor rigidity and mechanical strength; the foam material with the independent bubble structure has better rigidity and mechanical strength, but the sound absorption and insulation performance is poor, and the two foam materials cannot simultaneously have the characteristics of high-quality sound absorption and insulation and mechanical strength.
Disclosure of Invention
Based on the technical problems to be solved, the application provides the high-foaming sound-insulation resin lining and the preparation method thereof, and the resin lining has high mechanical strength while having good sound-absorption and sound-insulation characteristics through the double-layer core-shell structure and the application of the material thereof.
In order to achieve the aim, the application adopts the technical proposal that
The high-foaming sound-insulation resin lining is formed by pressing double-layer core-shell particles, wherein the double-layer core-shell particles comprise an inner core body and an outer shell, the core body is particles mainly prepared by mixing epoxy resin, nitrile rubber, a foaming agent and a processing aid, and the particle size of the core body is 0.1-1.5 mm; the shell is a thin layer mainly made of epoxy resin, thermoplastic resin, reinforcing fibers, foaming agent and processing aid, and the thickness of the shell is 0.1-1 mm.
Further, the porosity of the inner core particles after foaming is 60-88%, and the porosity of the outer shell after foaming is 40-75%.
In an improved technical scheme, the core body is mainly prepared from the following raw materials in parts by weight:
60-118 parts of mixed epoxy resin, 28-40 parts of foaming agent, 1-10 parts of foaming auxiliary agent, 25-45 parts of plasticizer, 2-5 parts of inorganic filler, 1-2 parts of vulcanizing agent, 2-5 parts of foam cell nucleating agent and 1-10 parts of water.
Further, the mixed epoxy resin is prepared by mixing the following raw materials in parts by weight: 10-35 parts of liquid epoxy resin, 30-65 parts of solid epoxy resin and 8-20 parts of solid rubber.
In an improved technical scheme, the shell is mainly prepared from the following raw materials in parts by weight:
30-60 parts of epoxy resin, 35-75 parts of nitrile rubber, 10-25 parts of methacrylonitrile, 3-12 parts of carbon fiber, 10-25 parts of foaming agent, 0.1-2 parts of foaming auxiliary agent, 1-3 parts of vulcanizing agent and 0.1-3 parts of deionized water.
Further, the raw materials of the shell also comprise 25-40 parts of polyurethane resin.
The second aspect of the application also discloses a preparation method of the high-foaming sound-insulating resin lining, which comprises
1) Adding liquid epoxy resin, solid epoxy resin and solid rubber into an internal mixer for banburying uniformly to prepare mixed epoxy resin, and then adding inorganic filler into the mixed epoxy resin for continuous banburying uniformly to obtain a mixture A1;
2) Adding a foaming agent and a foaming accelerator into the mixture A1, continuously banburying and uniformly mixing, and then adding a vulcanizing agent and a foam cell nucleating agent, continuously banburying and uniformly mixing to obtain a core body mixture A2;
3) Adding epoxy resin and nitrile rubber into an internal mixer for banburying uniformly, and then adding a foaming agent, a foaming auxiliary agent and a vulcanizing agent for continuous banburying uniformly to obtain a mixture B1;
4) Mixing methacrylonitrile and carbon fibers, adding deionized water, stirring uniformly, and then adding the mixture into the mixture B1 for continuous banburying and uniform mixing to obtain a shell mixture B2;
5) Adding the core mixture A2 into a main extruder, adding the shell mixture B2 into an auxiliary extruder, extruding materials of the main extruder and the auxiliary extruder through a core-shell co-extrusion process, and granulating by a high-speed granulator to obtain double-layer core-shell particles with a double-layer core-shell structure;
6) Placing the double-layer core shell particles into a blanking container of an extruder, blanking into a die, pressing and standing for 20-40 min, extruding and cutting the required shape to obtain the high-foaming sound-insulation resin lining; wherein, the suppression environment is: the temperature is 30-45 ℃, the pressing pressure is 0.2-0.5 Pa, and the pressing time is 50-90 s.
The application further discloses a nylon skeleton used when the high-foaming sound-insulating resin lining is applied, the nylon skeleton is a panel with an elastic buckle plate on one side, the shape of the panel is matched with the cross-sectional shape of a cavity of an installation part in a vehicle upright post, a plurality of fixing posts are arranged on the front side of the panel, limiting grooves are formed in the upper surfaces of the fixing posts, the nylon skeleton further comprises limiting posts inserted into the limiting grooves, at least two strip-shaped supporting bars are arranged on the side edges of the top of the limiting posts, and the supporting bars are distributed on the side edges of the top ends of the limiting posts in a linear or radial mode.
Further, the diameter of the supporting bar is 100-1000 mu m; the length of the supporting bar is 2-20mm;
the limiting groove is characterized in that the inner side wall of the limiting groove is provided with a barb groove part, and the outer side wall of the limiting post is provided with a barb body which is adaptive to the barb groove part.
Further, the limit column is prepared by mixing polyamide fiber materials and thermoplastic resin in a mixing ratio of 1-10:1; the thermoplastic resin comprises one or more of polyethylene, polyethylene copolymer, soft polyvinyl chloride and thermoplastic elastomer;
the supporting strips are tapered supporting strips with the diameters gradually decreasing from inside to outside, and the diameters of the tapered supporting strips at the same length position are different; the supporting strips are of strip-shaped structures with different lengths.
Compared with the prior art, the high-foaming sound-insulating resin liner has the following beneficial effects:
the resin lining adopting the double-layer core-shell structure is flexibly arranged through the selection of the core body and the shell material, and the core body structure mainly comprising the mixed epoxy resin and the nitrile rubber has high-rate foaming effect and excellent foaming stability; the shell structure taking epoxy resin, thermoplastic resin and reinforcing fiber as main materials enables the whole layer structure to form a honeycomb or honeycomb-like structure, the honeycomb-like structure is formed after foaming, the structure and the core body are staggered and separated to form multi-layer three-dimensional plates with different porosities and pore sizes, the high porosity characteristic of the core body enables the three-dimensional plates to have good sound absorption effect, the shell is compact, the shell has good sound insulation effect, and the honeycomb-like three-dimensional structure formed by staggered sound absorption layers and sound insulation layers is realized, so that high-efficiency and comprehensive sound absorption and insulation of high-low frequency noise are realized.
In addition, the honeycomb or honeycomb-like structure of the outer shell layer improves the structural strength of the foam layer, including the rigidity in all directions of transverse and longitudinal directions, and the tear strength and the bending strength capability in all directions can be uniform and can resist the destructive force from all directions. The outer shell layer of the resin liner comprises the methacrylonitrile, the carbon fiber and the polyurethane resin, so that the foamed honeycomb-shaped morphological structure is further ensured to be molded, the structural body has higher mechanical strength, and meanwhile, the structural body also has certain elastic bending strength.
The nylon framework is provided with the limiting columns to realize the installation and fixation of the resin lining, and meanwhile, the supporting bars on the limiting columns are pushed to arch when the resin lining foams so as to form longitudinal or oblique supporting columns; particularly, the support bars are arranged into structures with different lengths and diameters, so that the support bars are distributed at different positions when being pushed to arch, a three-dimensional structure embedded into the foaming layer is formed, and the mechanical strength of the whole foaming layer is greatly enhanced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings for those of ordinary skill in the art.
FIG. 1 is a schematic cross-sectional view of a high foaming soundproof resin liner of the present application;
FIG. 2 is a schematic structural view of a nylon backbone of the present application;
FIG. 3 is a schematic view of the construction of the support bar of the present application;
fig. 4A and 4B are schematic structural views of two embodiments of the limiting post of the present application.
Detailed Description
Specific embodiments of the present application are described in detail below with reference to the accompanying drawings.
The high foaming sound insulation resin liner 1 is formed by pressing double-layer core-shell particles, wherein the double-layer core-shell particles comprise an inner core body 2 and an outer shell body 3, and the inner core body and the outer shell body are shown in figure 1; the core body 2 is particles mainly prepared by mixing epoxy resin, nitrile rubber, foaming agent and processing aid, and the particle size of the core body 2 is 0.1-1.5 mm; the shell 3 is a thin layer mainly made of epoxy resin, thermoplastic resin, reinforcing fiber, foaming agent and processing aid, and the thickness of the shell 3 is 0.1-1 mm. After the resin lining is subjected to an electrophoresis foaming process, the inner layer core particles have a generation porosity of 60-88%, and the outer layer shell has a generation porosity of 40-75%.
Example 1
Formula of high-foaming sound-insulation resin lining raw material
The inner layer core body comprises the following components in mass: 600g of epoxy resin, 280g of foaming agent, 10g of foaming auxiliary agent, 250g of plasticizer, 20g of inorganic filler, 10g of vulcanizing agent, 20g of cell nucleating agent and 10g of water are mixed. The mixed epoxy resin is prepared by adding liquid epoxy resin, solid epoxy resin and solid rubber in a mass ratio of 10:30:8 into a mixing roll and uniformly mixing.
The outer shell comprises the following components in mass: 300g of epoxy resin, 350g of nitrile rubber, 100g of methacrylonitrile, 30g of carbon fiber, 100g of foaming agent, 1g of foaming auxiliary agent, 10g of vulcanizing agent and 1g of deionized water.
Example 2
The preparation method of the high-foaming sound-insulation resin lining comprises the following steps:
1) Adding liquid epoxy resin, solid epoxy resin and solid rubber into an internal mixer for banburying uniformly to prepare mixed epoxy resin, and then adding inorganic filler into the mixed epoxy resin for continuous banburying uniformly to obtain a mixture A1;
2) Adding a foaming agent and a foaming accelerator into the mixture A1, continuously banburying and uniformly mixing, and then adding a vulcanizing agent and a foam cell nucleating agent, continuously banburying and uniformly mixing to obtain a core body mixture A2;
3) Adding epoxy resin and nitrile rubber into an internal mixer for banburying uniformly, and then adding a foaming agent, a foaming auxiliary agent and a vulcanizing agent for continuous banburying uniformly to obtain a mixture B1;
4) Mixing methacrylonitrile and carbon fibers, adding deionized water, stirring uniformly, and then adding the mixture into the mixture B1 for continuous banburying and uniform mixing to obtain a shell mixture B2;
5) Adding the core mixture A2 into a main extruder, adding the shell mixture 2 into an auxiliary extruder, extruding materials of the main extruder and the auxiliary extruder through a core-shell co-extrusion process, and granulating by a high-speed granulator to obtain double-layer core-shell particles with a double-layer core-shell structure;
6) And (3) placing the double-layer core-shell particles into a blanking container of an extruder, blanking into a die, pressing and standing for 20-40 min, extruding and cutting the required shape to obtain the high-foaming sound-insulation resin lining.
Wherein in step 6) the pressing environment is: the temperature is 30-45 ℃, the pressing pressure is 0.2-0.5 Pa, and the pressing time is 50-90 s; the set pressing parameters enable the resin liners to be mutually bonded in a surface micro-melting state without damaging the integral honeycomb structure, and the formability is good.
Example 3
Formula of high-foaming sound-insulation resin lining raw material
The inner layer core body comprises the following components in mass: 1800g of epoxy resin, 400g of foaming agent, 100g of foaming auxiliary agent, 450g of plasticizer, 50g of inorganic filler, 20g of vulcanizing agent, 50g of cell nucleating agent and 100g of water are mixed.
The mixed epoxy resin is prepared by adding liquid epoxy resin, solid epoxy resin and solid rubber in a mass ratio of 35:65:20 into a mixing roll and uniformly mixing.
The outer shell comprises the following components in mass: 600g of epoxy resin, 750g of nitrile rubber, 250g of methacrylonitrile, 120g of carbon fiber, 250g of foaming agent, 20g of foaming auxiliary agent, 30g of vulcanizing agent and 30g of deionized water.
Example 4
Formula of high-foaming sound-insulation resin lining raw material
The inner layer core body comprises the following components in mass: 1800g of mixed epoxy resin, 400g of azodicarbonamide, 100g of zinc oxide, 450g of hydroxyl silicone oil, 50g of calcium carbonate, 20g of ammonium sulfide, 50g of nano calcium carbonate and 100g of water.
The mixed epoxy resin is prepared by adding liquid epoxy resin, solid epoxy resin and solid rubber in a mass ratio of 10:30:8 into a mixing roll and uniformly mixing.
The outer shell comprises the following components in mass: 600g of epoxy resin, 750g of nitrile rubber, 250g of methacrylonitrile, 120g of carbon fiber, 250g of azodicarbonamide, 20g of zinc oxide, 30g of ammonium sulfide and 30g of deionized water.
Prepared using the preparation method described in example 2.
Example 5
Formula of high-foaming sound-insulation resin lining raw material
The inner layer core body comprises the following components in mass: 900g of mixed epoxy resin, 300g of azodicarbonamide, 76g of zinc oxide, 308g of hydroxyl silicone oil, 31g of calcium carbonate, 12g of ammonium sulfide, 25g of nano calcium carbonate and 100g of water.
The mixed epoxy resin is prepared by adding liquid epoxy resin, solid epoxy resin and solid rubber in a mass ratio of 35:65:20 into a mixing roll and uniformly mixing.
The outer shell comprises the following components in mass: 500g of epoxy resin, 440g of nitrile rubber, 200g of methacrylonitrile, 85g of carbon fiber, 200g of azodicarbonamide, 13.1g of zinc oxide, 18g of ammonium sulfide and 20g of deionized water.
Prepared using the preparation method described in example 2.
Example 6
Formula of high-foaming sound-insulation resin lining raw material
The inner layer core body comprises the following components in mass: 900g of mixed epoxy resin, 300g of azodicarbonamide, 76g of zinc oxide, 308g of hydroxyl silicone oil, 31g of calcium carbonate, 12g of ammonium sulfide, 25g of nano calcium carbonate and 100g of water.
The mixed epoxy resin is prepared by adding liquid epoxy resin, solid epoxy resin and solid rubber in a mass ratio of 35:65:20 into a mixing roll and uniformly mixing.
The outer shell comprises the following components in mass: 500g of epoxy resin, 440g of nitrile rubber, 300g of polyurethane resin, 200g of methacrylonitrile, 85g of carbon fiber, 200g of azodicarbonamide, 13.1g of zinc oxide, 18g of ammonium sulfide and 20g of deionized water.
Prepared using the preparation method described in example 2.
Example 7
A nylon skeleton as shown in fig. 2 is used for mounting a high foaming soundproof resin liner, so that the resin liner is better fixed on an interior trim panel. Specifically, nylon skeleton is panel 2 that one side has elasticity buckle 1, panel 2 shape and the cross-section shape phase-match of the cavity of installation site in the vehicle stand, the front side of panel 2 is equipped with a plurality of fixed column 3, be equipped with above the fixed column 3 and inject groove 4, nylon skeleton is still including inserting limit post 5 in limit groove 4, limit post 5 top side is equipped with two at least rectangular form support bars 6, support bar 6 is linear type or radial distribution at limit post top side.
The diameter of the supporting bar is 100-1000 mu m; the length of the supporting strip 6 is 2-20mm.
The inner side wall of the limiting groove 4 is provided with a barb groove part 40, and the outer side wall of the limiting post 5 is provided with a barb body 50 which is matched with the barb groove part 40. When the limiting post is used, the limiting post is inserted into the limiting groove, so that the barb body of the limiting post is just buckled into the barb groove part, and then the limiting post is fixed.
The limit column 5 is prepared by mixing polyamide fiber materials and thermoplastic resin in a mixing ratio of 1-10:1; the thermoplastic resin comprises one or more of polyethylene, polyethylene copolymer, soft polyvinyl chloride and thermoplastic elastomer.
When the foaming layer is expanded by electrophoresis, the expansion pushes the supporting strips to be supported outwards to form a longitudinal or oblique support, so that the rigidity and the mechanical strength of the foaming layer are improved.
Example 7
On the basis of the embodiment 7, the example is optimized and improved on the supporting strip.
As shown in fig. 3, part of the supporting strips 6 are tapered supporting strips 60 with gradually reduced diameters from inside to outside, and the diameters of the tapered supporting strips 60 at the same length position are different; the supporting bar 60 has a strip structure with different lengths, as shown in fig. 4A and 4B.
The support bars are different in diameter, so that the support bars are outwards stretched at different angles when being subjected to expansion thrust of the foaming layer, and support with different inclined planes is formed; the support bars are distributed more uniformly in the three-dimensional structural plane of the foaming layer due to the structures with different lengths.
Comparative example 1
The resin lining raw material comprises the following components in mass: 900g of mixed epoxy resin, 300g of azodicarbonamide, 76g of zinc oxide, 308g of hydroxyl silicone oil, 31g of calcium carbonate, 12g of ammonium sulfide, 25g of nano calcium carbonate and 100g of water.
The mixed epoxy resin is prepared by adding liquid epoxy resin, solid epoxy resin and solid rubber in a mass ratio of 35:65:20 into a mixing roll and uniformly mixing.
The preparation method comprises the following steps:
1) Adding inorganic filler into the mixed epoxy resin, and continuously and uniformly banburying to obtain a mixture A1;
2) Adding a foaming agent and a foaming accelerator into the mixture A1, continuously banburying and uniformly mixing, and then adding a vulcanizing agent and a cell nucleating agent, continuously banburying and uniformly mixing to obtain a resin lining;
3) And placing the resin lining in a blanking container of an extruder, blanking into a die, pressing and standing for 20-40 min, extruding and cutting the required shape to obtain the high-foaming sound-insulation resin lining.
Comparative example 2
The resin lining raw material comprises the following components in mass: 500g of epoxy resin, 440g of nitrile rubber, 200g of methacrylonitrile, 85g of carbon fiber, 200g of azodicarbonamide, 13.1g of zinc oxide, 18g of ammonium sulfide and 20g of deionized water.
The preparation method comprises the following steps:
1) Adding epoxy resin and nitrile rubber into an internal mixer for banburying uniformly, and then adding a foaming agent, a foaming auxiliary agent and a vulcanizing agent for continuous banburying uniformly to obtain a mixture B1;
2) Mixing methacrylonitrile and carbon fibers, adding deionized water, stirring uniformly, and then adding the mixture into the mixture B1 for continuous banburying and uniform mixing to obtain a resin lining;
3) And placing the resin lining in a blanking container of an extruder, blanking into a die, pressing and standing for 20-40 min, extruding and cutting the required shape to obtain the high-foaming sound-insulation resin lining.
1. Pore Performance test
Porosity and pore size test of high foaming sound insulation resin liner:
resin liners were prepared according to the formulations of example 5, example 6, comparative example 1 and comparative example 2, set as sample group 1, sample group 2, sample group 3 and sample group 4, respectively.
Porosity test: determination of the Density d before foaming of sample group 1, sample group 2, sample 3 and sample 4 0 And density d of the foamed glue obtained after foaming t The method comprises the steps of carrying out a first treatment on the surface of the The foamed glue obtained after foaming judges the core body and the shell body part (judging standard: the core body has more holes and is in discontinuous discrete state, the shell body has fewer holes and is in continuous multidimensional structure) according to the internal holes and lines, and the core body density and the shell body density are measured by adopting a general foaming material density measuring method; each sample set was measured for 20 samples corresponding to the core and shell, respectively, and averaged.
Wherein the foaming process of the foaming adhesive comprises the following steps: and (3) respectively placing the resin liner samples (100 multiplied by 80 multiplied by 5 mm) of each sample group in a constant temperature oven at 180 ℃ by using a drainage method, baking for 20 minutes, taking out, and cooling to room temperature to obtain the resin liner.
Average pore size test: placing the sample slices after foaming of the sample group 1, the sample group 2, the sample group 3 and the sample group 4 on a microscope stage, marking the core body and the shell part (marking standard: the core body has more holes and is in a discontinuous discrete state, the shell has fewer holes and is in a continuous multidimensional structure) in the foaming glue, moving the maximum horizontal diameter of the measuring scale in each foaming hole through which the core body and the shell pass, measuring 50 foaming holes corresponding to the core body and the shell respectively in each sample group, and calculating the range values of the maximum aperture and the minimum aperture of the core body and the shell.
The results are shown in table 1 below:
through visual observation, the pore size distribution structures of the sample group 1 and the sample group 2 are arranged like a honeycomb structure, the continuous pores on the honeycomb side are smaller, the pores on the part separated by the honeycomb side are larger, and the whole pores are in a continuous communication state.
2. Physical and sound-insulating and sound-absorbing performance test
Resin liners were prepared according to the formulations of example 5, example 6, comparative example 1 and comparative example 2, set as sample group 1, sample group 2, sample 3 and sample 4, respectively. And (3) maintaining the products of the sample groups 1-4 at 140-215 ℃ for 30 minutes for foaming to form the final foaming filling block.
The foam filler block materials of sample groups 1-4 were tested for physical properties according to the standard test method and for sound insulation according to the test method of GB/T19889.2-2002. The test results are shown in table 2 below.
TABLE 2 physical and Sound insulation Performance test results
As is clear from Table 2, the highly foamed soundproof resin liners of the present application exhibited excellent sound absorption and physical properties. As can be seen from the results of the pore performance test in Table 2 in combination with Table 1, the resin liners of sample groups 1 and 2 have a porosity and pore size which provide a sound-insulating effect over a larger frequency range, are more conducive to noise insulation over various frequencies, and are excellent in sound-insulating performance; while the resin liners of sample sets 3 and 4 are less sound insulating at high frequencies.
The 4206 type impedance tube is adopted, the principle of measuring the sound absorption and energy absorption of materials by the impedance tube is based on a transfer function, the principle is that broadband steady random signals are decomposed into incident waves pi and reflected waves pr, the sizes of pi and pr are determined by sound pressures measured by two microphones arranged on the tube, and sound absorption coefficients of the foamed sample group 1, the foamed sample group 2, the foamed sample group 3 and the foamed sample group 4 are obtained through calculation. The test results are shown in table 3 below.
Table 3 sound absorbing property test results
As shown in table 3, the sound absorption coefficients of the sound absorbing materials of the sample group 1 and the sample 2 were in an upward trend with an increase in frequency, and had a good sound absorption effect in a high frequency range, and had a more stable and wide-area frequency sound absorption effect compared with the sample group 3 and the sample group 4.
It should be noted that, in this document, the term "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While the preferred embodiments and examples of the present application have been described in detail with reference to the accompanying drawings, the present application is not limited to the above-described embodiments and examples, and various changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims (8)
1. The high-foaming sound-insulation resin lining is characterized in that the resin lining is formed by pressing double-layer core-shell particles, the double-layer core-shell particles comprise an inner core body and an outer shell body, the core body is particles mainly prepared by mixing epoxy resin, nitrile rubber, a foaming agent and a processing aid, and the particle size of the core body is 0.1-1.5 mm; the shell is a thin layer mainly made of epoxy resin, thermoplastic resin, reinforcing fiber, foaming agent and processing aid, and the thickness of the shell is 0.1-1 mm; the porosity of the inner layer core particles after foaming is 60-88%, and the porosity of the outer layer shell after foaming is 40-75%;
the mixed epoxy resin is prepared by mixing the following raw materials in parts by weight: 10-35 parts of liquid epoxy resin, 30-65 parts of solid epoxy resin and 8-20 parts of solid rubber.
2. A high foaming sound insulation resin liner as claimed in claim 1, wherein said core is made mainly of the following raw materials in parts by mass:
60-118 parts of mixed epoxy resin, 28-40 parts of foaming agent, 1-10 parts of foaming auxiliary agent, 25-45 parts of plasticizer, 2-5 parts of inorganic filler, 1-2 parts of vulcanizing agent, 2-5 parts of foam cell nucleating agent and 1-10 parts of water.
3. A high foaming sound insulation resin liner as claimed in claim 1, wherein said shell is made mainly of the following raw materials in parts by mass:
30-60 parts of epoxy resin, 35-75 parts of nitrile rubber, 10-25 parts of methacrylonitrile, 3-12 parts of carbon fiber, 10-25 parts of foaming agent, 0.1-2 parts of foaming auxiliary agent, 1-3 parts of vulcanizing agent and 0.1-3 parts of deionized water.
4. A high foaming sound insulation resin liner as defined in claim 3, wherein said raw materials of the housing further comprise 25-40 parts of polyurethane resin.
5. A method for producing the high-foaming soundproof resin liner of claim 3, which comprises
1) Adding liquid epoxy resin, solid epoxy resin and solid rubber into an internal mixer, banburying until the liquid epoxy resin, the solid epoxy resin and the solid rubber are melted uniformly to prepare mixed epoxy resin, and then adding inorganic filler into the mixed epoxy resin, and continuously banburying uniformly to obtain a mixture A1;
2) Adding a foaming agent and a foaming accelerator into the mixture A1, continuously banburying and uniformly mixing, and then adding a vulcanizing agent and a foam cell nucleating agent, continuously banburying and uniformly mixing to obtain a core body mixture A2;
3) Adding epoxy resin and nitrile rubber into an internal mixer, banburying until the epoxy resin and nitrile rubber are melted uniformly, and then adding a foaming agent, a foaming auxiliary agent and a vulcanizing agent, and continuously banburying uniformly to obtain a mixture B1;
4) Mixing methacrylonitrile and carbon fibers, adding deionized water, stirring uniformly, and then adding the mixture into the mixture B1 for continuous banburying and uniform mixing to obtain a shell mixture B2;
5) Adding the core mixture A2 into a main extruder, adding the shell mixture B2 into an auxiliary extruder, extruding materials of the main extruder and the auxiliary extruder through a core-shell co-extrusion process, and granulating by a high-speed granulator to obtain double-layer core-shell particles with a double-layer core-shell structure;
6) Placing the double-layer core shell particles into a blanking container of an extruder, blanking into a die, pressing and standing for 20-40 min, extruding and cutting the required shape to obtain the high-foaming sound-insulation resin lining; wherein, the suppression environment is: the temperature is 30-45 ℃, the pressing pressure is 0.2-0.5 Pa, and the pressing time is 50-90 s.
6. A nylon skeleton using the high foaming sound insulation resin lining according to any one of claims 1-5, characterized in that, nylon skeleton (1) is panel (2) with elastic buckle on one side, the shape of panel (2) matches with the cross-section shape of the cavity of the installation site in the vehicle upright, the front side of panel (2) is equipped with a plurality of fixed column (3), the top of fixed column (3) is equipped with limiting groove (4), nylon skeleton (1) still includes spacing post (5) of inserting limiting groove (4), spacing post (5) top side is equipped with at least two rectangular support bars (6), support bars (6) are linear type or radial distribution in spacing post top side.
7. A nylon skeleton lined with a highly foamed sound-insulating resin according to claim 6, wherein the support bar (6) has a diameter of 100 to 1000 μm; the length of the supporting bar (6) is 2-20mm;
the inner side wall of the limiting groove (4) is provided with a barb groove part (40), and the outer side wall of the limiting column (5) is provided with a barb body (50) which is matched with the barb groove part (40).
8. The nylon skeleton lined with high-foaming sound-insulating resin as claimed in claim 6, wherein the limit column (5) is made by mixing polyamide fiber material and thermoplastic resin with a mixing ratio of 1-10:1; the thermoplastic resin comprises one or more of polyethylene, polyethylene copolymer, soft polyvinyl chloride and thermoplastic elastomer;
part of the supporting strips (6) are conical supporting strips (60) with the diameters gradually decreasing from inside to outside, and the diameters of the different conical supporting strips (60) at the same length position are different; the tapered support bars (60) are strip-shaped structures with different lengths.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040098626A (en) * | 2001-12-21 | 2004-11-20 | 헨켈 테로손 게엠베하 | Expandable epoxy resin-based systems modified with thermoplastic polymers |
| CN103554845A (en) * | 2013-11-04 | 2014-02-05 | 乐山铭平方塑料制品科技有限公司 | Low-density sound absorption and insulation polymer composite and preparation method thereof |
| CN112126197A (en) * | 2020-09-30 | 2020-12-25 | 贵州凯科特材料有限公司 | Preparation method of alternating multilayer epoxy resin-based conductive composite microporous foam material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040098626A (en) * | 2001-12-21 | 2004-11-20 | 헨켈 테로손 게엠베하 | Expandable epoxy resin-based systems modified with thermoplastic polymers |
| CN103554845A (en) * | 2013-11-04 | 2014-02-05 | 乐山铭平方塑料制品科技有限公司 | Low-density sound absorption and insulation polymer composite and preparation method thereof |
| CN112126197A (en) * | 2020-09-30 | 2020-12-25 | 贵州凯科特材料有限公司 | Preparation method of alternating multilayer epoxy resin-based conductive composite microporous foam material |
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