CN112920459A - Sound insulation expansion material and preparation method and application thereof - Google Patents

Sound insulation expansion material and preparation method and application thereof Download PDF

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Publication number
CN112920459A
CN112920459A CN202110083285.XA CN202110083285A CN112920459A CN 112920459 A CN112920459 A CN 112920459A CN 202110083285 A CN202110083285 A CN 202110083285A CN 112920459 A CN112920459 A CN 112920459A
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parts
ethylene
agent
crosslinking agent
expansion material
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郭慧
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Shanghai Yuanhong New Material Technology Co ltd
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Shanghai Yuanhong New Material Technology Co ltd
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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Abstract

The invention relates to a sound insulation expansion material and a preparation method and application thereof. The composite cross-linking agent comprises the following components: filler, high-temperature crosslinking agent, low-temperature crosslinking agent and auxiliary crosslinking agent; the sound insulation expansion material comprises the following components in parts by weight: 0-50 parts of ethylene-acrylate copolymer, 10-30 parts of ethylene-vinyl acetate copolymer, 10-30 parts of ethylene-octene copolymer, 0.5-1.2 parts of mold release agent, 5-20 parts of filler, 1-20 parts of foaming agent, 1-5 parts of auxiliary foaming agent, 0.5-2 parts of heat stabilizer, 1-15 parts of tackifying resin, 5-15 parts of composite cross-linking agent, 0.6-1.5 parts of flame retardant and 0.6-1.5 parts of antioxidant. Compared with the prior art, the invention overcomes the defects of high-temperature (more than 190 ℃) flow and surface hole breaking of the expansion material, so that the sound insulation expansion material product is softer after foaming, and the high-temperature resistance can meet the requirement.

Description

Sound insulation expansion material and preparation method and application thereof
Technical Field
The invention relates to an expansion material, in particular to a sound insulation expansion material and a preparation method and application thereof.
Background
In the process of assembling and welding the sheet metal of the automobile body, due to the shape of the sheet metal and the shape of the automobile body, a gap or a channel is easily formed on the welded sheet metal part, and the existence of the gap causes the interior and exterior of the automobile not to be sealed. Therefore, water is easy to fill the automobile in rainy days, and various external noise, dust and the like are easy to conduct into the automobile through the channel when the automobile runs, so that the health of passengers and the riding comfort of the passengers are influenced, and the NVH index in the automobile is also influenced.
In order to solve the problem, PU polyurethane foaming materials are injected to seal gaps or channels in the automobile body metal plate at the beginning, and then the foaming materials which are made of ethylene-vinyl acetate polymers, ethylene-methyl acrylate polymers, ethylene-ethyl acrylate polymers and ethylene-butyl acrylate polymers and meet the process conditions of the automobile body metal plate paint line are slowly developed, are installed on the automobile body metal plate before foaming, and are foamed to seal cavities after a paint baking process.
In the prior art, the ethylene-vinyl acetate polymer, the ethylene-methyl acrylate polymer, the ethylene-ethyl acrylate polymer, the ethylene-butyl acrylate polymer and the epoxy resin used in Chinese patents CN1887949A, CN101535394A, CN101838416A, CN105153732A, CN105111572A, CN104419101A and the like are produced, the produced product can meet the use requirements, but the foamed adhesive is not firmly bonded with a PA66 framework during production and is easy to separate, the rubber foamed adhesive needs to be adhered by self-adhesive, and the like.
Disclosure of Invention
The invention aims to provide a sound insulation expansion material, and a preparation method and application thereof, so as to improve the foaming performance of foaming adhesive of a sound insulation block product and improve the plugging performance of the material in a cavity of a vehicle body.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a composite cross-linking agent, which comprises the following components in parts by weight:
Figure BDA0002909914070000021
in one embodiment of the present invention, the filler is selected from barium sulfate, calcium carbonate, talc, diatomaceous earth, rare earth fillers, or the like.
In one embodiment of the invention, the high temperature crosslinking agent is selected from dicumyl peroxide (DCP) or an odourless DCP, preferably an odourless DCP. Odorless DCP is known under the chemical name di- (tert-butylperoxyisopropyl) benzene, also known as BIBP. Dicumyl peroxide (DCP) has good crosslinking effect, but easily generates unpleasant odor, and a BIPB odorless crosslinking agent bis-tert-butylperoxydiisopropylbenzene is relatively environment-friendly compared with DCP, so the BIPB odorless crosslinking agent is preferably selected in the invention, and the crosslinking temperature is 160-180 ℃.
In one embodiment of the invention, the low temperature cross-linking agent is selected from dibenzoyl peroxide (BPO).
In one embodiment of the present invention, the co-crosslinking agent is selected from vinyl methyl triisocyanocyanurate, triethylene propyl isocyanurate, dipentaerythritol hexaacrylate or pentaerythritol triacrylate, dipentaerythritol hexaacrylate, trimethylolpropane trimethacrylate.
The preparation method of the composite cross-linking agent comprises the step of uniformly mixing in a low-speed mixer according to a set proportion relation to obtain the composite cross-linking agent.
In a second aspect of the invention, the sound insulation expansion material comprises the following components in parts by weight:
Figure BDA0002909914070000022
Figure BDA0002909914070000031
in one embodiment of the present invention, the ethylene-acrylate copolymer has a melt index of 10 to 40g/10 min.
In one embodiment of the invention, the first ethylene-vinyl acetate copolymer has a melt index of 0.5 to 10g/10 min.
In one embodiment of the invention, the second ethylene-vinyl acetate copolymer has a melt index of > 20g/10 min.
In one embodiment of the present invention, the ethylene-octene copolymer has a melt index of 10 to 20g/10 min.
In one embodiment of the invention, the release agent is selected from the group consisting of oleic acid compounds, including oleamide and erucamide. The release agent acts on the production process of products, so that the combined material is easy to separate from the die and is not easy to stick to the die.
In one embodiment of the present invention, the filler is selected from barium sulfate, calcium carbonate, talc, diatomaceous earth, rare earth fillers, or the like. The filler acts to increase the temperature and bending resistance of the composite.
In one embodiment of the invention, the blowing agent is selected from one or both of an AC blowing agent or an OBSH-type blowing agent. The AC foaming agent, namely azodicarbonamide, has the largest gas forming amount, the best performance and wide application, is applied to synthetic materials such as polyvinyl chloride, polyethylene, polypropylene, polystyrene, polyamide, ABS, various rubbers and the like, and an appropriate amount of activating agent (such as zinc oxide, stearate, carbonate and phosphate) is added according to the performance of a product under the conventional condition to adjust the decomposition temperature, and the using amount of the activating agent depends on the type of the activating agent and is determined by tests. The OBSH foaming agent, namely 4,4' -oxybis-benzenesulfonyl hydrazide is also a foaming agent with excellent performance and is very widely applied, and the OBSH foaming agent is superior to an AC foaming agent for a foaming product with low multiplying power, so that the foaming product with high odds ratio is not suitable.
In one embodiment of the invention, the co-blowing agent is selected from zinc oxide, baking soda or modified urea.
In one embodiment of the present invention, the heat stabilizer is selected from a lead salt-based heat stabilizer, an organotin-based heat stabilizer, a metal soap-based heat stabilizer, a rare earth-based heat stabilizer, and zinc stearate. Among them, a rare earth heat stabilizer or zinc stearate is preferable in terms of the environmental protection performance of the auxiliary.
In one embodiment of the invention, the tackifying resin is selected from C5 resin, C9 resin, C5C9 hybrid resin, epoxy resin, or the like. The C5C9 copolymer resin integrates the advantages of C5 and C9, has tackifying effect and meets the temperature resistance requirement.
In one embodiment of the invention, the flame retardant is selected from a metal oxide flame retardant, a phosphorus based flame retardant, a silicone flame retardant or a metal boride. Good flame retardant effect and environmental protection, and preferably selects rare earth oxide in metal oxide.
In one embodiment of the invention, the antioxidant is selected from pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010), tris [2, 4-di-tert-butylphenyl ] phosphite (antioxidant 168) or N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine (antioxidant KY1098) and B225 antioxidant. The B225 antioxidant is a synergistic processing/long-acting heat stabilizer and is a binary classical compound antioxidant compounded by 1010 antioxidant and 168 antioxidant. The hindered phenol content is higher, and the long-acting stability is emphasized.
In one embodiment of the present invention, the weight part of the flame retardant is preferably 1 to 1.5, and the weight part of the antioxidant is preferably 1 to 1.5.
According to the third aspect of the invention, the preparation method of the sound insulation expansion material is provided, the composite cross-linking agent is firstly prepared and mixed, and then the composite cross-linking agent and other components are mixed and uniformly mixed to obtain the sound insulation expansion material.
Further, the preparation method of the sound insulation expansion material comprises the following steps:
(1) preparing a composite cross-linking agent: weighing 60-75 parts by weight of filler, 15-20 parts by weight of high-temperature crosslinking agent, 1-4 parts by weight of low-temperature crosslinking agent and 5-8 parts by weight of auxiliary crosslinking agent, and fully stirring in a low-speed mixer for later use;
(2) preparing a sound insulation expansion material: 0-50 parts of ethylene-acrylate copolymer, 10-30 parts of ethylene-vinyl acetate copolymer I, 10-30 parts of ethylene-vinyl acetate copolymer II and 10-30 parts of ethylene-octene copolymer, after weighing, adding white oil or epoxidized soybean oil and uniformly stirring, then sequentially weighing the following auxiliary materials, namely 0.5-1.2 parts of release agent, 5-20 parts of filler, 1-20 parts of foaming agent, 1-5 parts of foaming auxiliary agent, 0.5-2 parts of heat stabilizer, 1-15 parts of tackifying resin, 5-15 parts of composite cross-linking agent, 0.6-1.5 parts of flame retardant and 0.6-1.5 parts of antioxidant, and putting the mixture into a low-speed mixer to be fully stirred;
(3) preheating the extruder to 65-115 ℃, putting down the mixer after the extrusion temperature is stabilized at 65-115 ℃, stirring the mixture uniformly in advance, extruding and granulating according to an extrusion process, drying, packaging and warehousing.
The invention provides a vehicle body cavity sound insulation expansion block product, which is obtained by performing secondary injection molding on the sound insulation expansion material.
In a fifth aspect of the invention, a preparation method of the car body cavity sound insulation expansion block product is provided, which comprises the following steps: (4) the injection molding comprises single-color injection molding and double-color injection molding; and (3) firstly performing injection molding on the PA66 framework according to the injection molding process requirement, then performing secondary injection molding according to the injection molding process requirement of the sound insulation expansion material, preparing the sound insulation expansion material into a finished product, and inspecting, packaging and warehousing.
According to a sixth aspect of the invention, the application of the sound insulation expansion material is provided, and the sound insulation expansion material is used for preparing a sound insulation expansion block of a cavity of a vehicle body.
The main working principle of the invention is as follows: the sound insulation expansion material can be crosslinked at different temperature sections after the composite crosslinking agent is used, and the crosslinking density can be increased. Because the melting point temperature is low (50-70) DEG C when the base material is used in the formula, the melt index of the main material after mixing is 10-20g/10min, and the melt strength is low, a product with a large multiplying factor can be obtained after the foaming agent is added, but the problems of flowing and hole breaking are easily caused after high-temperature baking (above 180 ℃) because the melt strength is low, the cross-linking density and the cross-linking speed can be improved when the material is in a molten state by adding the compound cross-linking agent, the defect of flowing is overcome, the product with a large multiplying factor can also be obtained, and the sound-insulating expanded material product is softer after foaming, and the high-temperature resistance can also meet the requirement.
In the invention, the release agent, tackifying resin, auxiliary crosslinking agent and other materials are all materials which are frequently used in the fields of ink and paint, but the materials are not used in the field of cavity sound-insulating blocks before, and the invention enhances the bonding performance of the combined formula material with PA66, aluminum skin, galvanized iron, cold-rolled steel plate and other materials during production and flattens the product during foaming by adding the materials, thereby enhancing the blocking performance of the foaming adhesive.
The improvement of the invention mainly lies in that: the prepared composite cross-linking agent is used, and raw materials used in the fields of paint and ink are introduced, so that the foaming performance (multiplying power and high-temperature performance) of the foaming adhesive of the sound insulation block product is improved, the plugging performance of the material in a cavity of a vehicle body is improved, the flexibility of the product after foaming, the bonding performance of the product, the foaming smoothness and the foaming shrinkage performance are obviously improved. And the high temperature resistance is almost unchanged, and the performance requirement of the material can be met.
Compared with the prior art, the beneficial effects of the invention are mainly embodied in the following aspects:
compared with the prior art, the existing sound insulation expansion material uses a single cross-linking agent, for example, a high-temperature cross-linking agent, the cross-linking is started at the temperature of over 160 ℃, the highest melting point of a base material of the sound insulation expansion material is 100 ℃, if the temperature is higher than the highest melting point, the processing and the production are greatly troublesome, the mixing is not good, the foaming and the cross-linking are performed in advance, and the like. When the base material with low melting point temperature and high fluidity is used for production, when the material is foamed at high temperature and heated to 120-160 ℃, the material will flow and drop because no crosslinking exists, and the blocking performance of the material is affected. The high-low temperature composite crosslinking is used, the melting point temperature is selected to be low (50-70) DEG C when the base material is used, the melt index of the main material after mixing is 10-20g/10min, so that the processing and the production are facilitated, and in the foaming process of the material, because the high-low temperature composite crosslinking is adopted, the material starts to crosslink under the condition of complete melting at 120 ℃, the condition of dripping can be completely avoided, the auxiliary crosslinking agent is added, the crosslinking density and the crosslinking speed of the foaming material are favorably increased, the cohesive force of the material during foaming is increased, and the material is prevented from collapsing and breaking holes during high-temperature foaming.
Materials used in the fields of printing ink and paint are introduced, the dispersing effect and the material wettability of material mixing are improved by adding the materials, the materials are mixed more uniformly, the bonding property of the combined formula material and materials such as PA66, aluminum sheet, galvanized iron and cold-rolled steel sheet is enhanced during production, and a product is relatively flat during foaming, so that the plugging property of the foaming adhesive is enhanced, and the corrosion resistance of the composite material can be improved.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1:
preparing a composite cross-linking agent: wt.%
75 parts of filler calcium carbonate; weighing 15 parts of high-temperature crosslinking agent BIPB, 1.5 parts of low-temperature crosslinking agent (BPO) and 7 parts of auxiliary crosslinking agent dipentaerythritol hexaacrylate, and fully mixing the raw materials in a low-speed stirrer according to the weight proportion of the formula for later use;
preparing a main formula: wt.%
The material comprises, by weight, 20 parts of an ethylene-acrylate copolymer, 15 parts of a first ethylene-vinyl acetate copolymer, 20 parts of a second ethylene-vinyl acetate copolymer, 5 parts of an ethylene-octene copolymer, 0.5 part of a release agent (an oleic acid compound), 10 parts of a filler, 10 parts of an AC azo foaming agent, 3 parts of zinc oxide, 2 parts of a heat stabilizer (zinc stearate), 8 parts of tackifying resin, 10 parts of a composite crosslinking agent, 1.3 parts of a flame retardant, 0.9 part of an antioxidant and the like, and the raw materials are fully mixed in a high-speed stirrer according to the weight proportion of the formula, extruded and granulated, and then subjected to secondary injection molding with a PA66 injection molding framework, injection molding and sample preparation and performance testing.
Example 2:
preparing a composite cross-linking agent: wt.%
75 parts of filler calcium carbonate; weighing 15 parts of high-temperature crosslinking agent BIPB, 3 parts of low-temperature crosslinking agent (BPO) and 7 parts of auxiliary crosslinking agent dipentaerythritol hexaacrylate, and fully mixing the raw materials in a low-speed stirrer according to the weight ratio of the formula for later use;
preparing a main formula: wt.%
The material comprises, by weight, 20 parts of an ethylene-acrylate copolymer, 15 parts of a first ethylene-vinyl acetate copolymer, 20 parts of a second ethylene-vinyl acetate copolymer, 5 parts of an ethylene-octene copolymer, 0.5 part of a release agent (an oleic acid compound), 10 parts of a filler, 10 parts of an AC azo foaming agent, 3 parts of zinc oxide, 2 parts of a heat stabilizer (zinc stearate), 8 parts of tackifying resin, 10 parts of a composite crosslinking agent, 1.3 parts of a flame retardant, 0.9 part of an antioxidant and the like, and the raw materials are fully mixed in a high-speed stirrer according to the weight proportion of the formula, extruded and granulated, and then subjected to secondary injection molding with a PA66 injection molding framework, injection molding and sample preparation and performance testing.
Example 3:
preparing a composite cross-linking agent: wt.%
75 parts of filler calcium carbonate; weighing 15 parts of high-temperature crosslinking agent BIPB, 3 parts of low-temperature crosslinking agent (BPO) and 2 parts of auxiliary crosslinking agent dipentaerythritol hexaacrylate, and fully mixing the raw materials in a low-speed stirrer according to the weight proportion of the formula for later use;
preparing a main formula: wt.%
The material comprises, by weight, 20 parts of an ethylene-acrylate copolymer, 15 parts of a first ethylene-vinyl acetate copolymer, 20 parts of a second ethylene-vinyl acetate copolymer, 5 parts of an ethylene-octene copolymer, 0.5 part of a release agent (an oleic acid compound), 10 parts of a filler, 10 parts of an AC azo foaming agent, 3 parts of zinc oxide, 2 parts of a heat stabilizer, 8 parts of a tackifying resin, 10 parts of a composite crosslinking agent, 1.3 parts of a flame retardant and 0.9 part of an antioxidant, and the like, wherein the raw materials are fully mixed in a high-speed stirrer according to the weight proportion of the formula, extruded and granulated, and then subjected to secondary injection molding with a PA66 injection molding framework, injection molding and sample preparation and performance testing.
Comparative example 1: wt.%
20 parts of ethylene-butyl acrylate copolymer, 15 parts of ethylene-vinyl acetate copolymer I, 20 parts of ethylene-vinyl acetate copolymer II, 5 parts of ethylene-octene copolymer, 0.5 part of release agent (oleic acid compound), 10 parts of filler, 10 parts of AC azo foaming agent, 3 parts of zinc oxide, 2 parts of heat stabilizer, 8 parts of tackifying resin, 1.2 parts of high-temperature crosslinking agent, 1.3 parts of flame retardant and 0.9 part of antioxidant, and the like, wherein the raw materials are fully mixed in a high-speed stirrer according to the weight proportion of the formula, extruded and granulated, and then subjected to secondary injection molding with a PA66 injection molding framework, injection molding and sample preparation and performance testing.
Comparative example 2: wt.%
The material comprises, by weight, 30 parts of an ethylene-methyl acrylate copolymer, 30 parts of an ethylene-butyl acrylate-maleic anhydride terpolymer, 1.2 parts of a high-temperature cross-linking agent (BIPB), 15 parts of an AC foaming agent, 10 parts of a filler, 2 parts of a heat stabilizer, 1.3 parts of a flame retardant, 0.9 part of an antioxidant, and the like, and the raw materials are fully mixed in a high-speed stirrer according to the weight proportion of the formula, extruded and granulated, then subjected to secondary injection molding with a PA66 injection molding framework, subjected to injection molding to prepare a sample, and tested for performance.
The ethylene-acrylic acid ester copolymers used in the above examples 1, 2 and 3 and comparative examples 1 and 2 are ethylene-butyl acrylate copolymers, the BA content is 33-37%, the melting point temperature is 63-67 ℃, and the melt index is 35-45g/10min, and in addition, the ethylene-acrylic acid ester copolymers used in the above examples 1, 2 and 3 and comparative examples 1 and 2 can also include ethylene-methyl acrylate copolymers and ethylene-ethyl acrylate copolymers.
The ethylene-vinyl acetate copolymer one used in the above examples 1, 2 and 3 and comparative examples 1 and 2 had a VA fat content of 26 to 28%, a melting point temperature of 70 to 72 ℃ and a melt index of 2 to 6g/10 min.
The ethylene-vinyl acetate copolymer II used in the above examples 1, 2 and 3 and comparative examples 1 and 2 had a VA fat content of 31 to 35%, a melting point temperature of 65 to 71 ℃ and a melt index of 20 to 30g/10 min.
The ethylene-methyl acrylate-maleic anhydride copolymer used in the above examples 1, 2 and 3 and comparative examples 1 and 2 was selected from the ethylene-butyl acrylate-maleic anhydride copolymer BA content of 5 to 6%, the maleic anhydride content of 2.8 to 3, the melting point temperature of 105-. The ethylene-methyl acrylate-maleic anhydride copolymer used in the above examples 1, 2, 3 and comparative examples 1, 2 may also include ethylene-ethyl acrylate-maleic anhydride copolymer and ethylene-butyl acrylate-maleic anhydride copolymer.
Calcium carbonate was selected as the filler in examples 1, 2 and 3 and comparative examples 1 and 2.
The high temperature crosslinking agents used in the above examples 1, 2 and 3 and comparative examples 1 and 2 were BIPB odorless crosslinking agents with a crosslinking temperature of 160-180 ℃.
The low temperature crosslinking agent BPO, i.e., the dibenzoamide peroxide, used in the above examples 1, 2, 3 and comparative examples 1, 2 has a crosslinking temperature of 120-140 ℃.
The auxiliary crosslinking agents used in the above examples 1, 2 and 3 and the comparative examples 1 and 2 are selected from dipentaerythritol hexaacrylate, so that the crosslinking density of the combined material is increased, and the temperature resistance of the product is improved.
The co-blowing agents used in examples 1, 2 and 3 and comparative examples 1 and 2 were selected from zinc oxide. Since zinc oxide is the best for material stability.
The release agents used in the above examples 1, 2, 3 and comparative examples 1, 2 were selected from oleamide, which acts during the production of the articles to make the combined material easily released from the mold and not easily stick to the mold.
The foaming agent used in examples 1, 2 and 3 and comparative examples 1 and 2 was an AC foaming agent.
Zinc stearate is selected as the heat stabilizer used in examples 1, 2 and 3 and comparative examples 1 and 2.
The tackifying resins used in examples 1, 2 and 3 and comparative examples 1 and 2 were selected from C5C9 blends.
The flame retardants used in the above examples 1, 2, 3 and comparative examples 1, 2 are selected from rare earth oxides among metal oxides.
B225 antioxidant was used as the antioxidant used in examples 1, 2 and 3 and comparative examples 1 and 2.
The above examples 1, 2 and 3 and comparative examples 1 and 2 are extruded and granulated, and then are subjected to secondary injection molding with a PA66 injection molding framework, wherein the injection molding sample is a car body cavity sound insulation expansion material and is used for blocking car body side wall cavities, but the examples and the comparative examples are different in formula system, and have obvious difference in material performance. Comparative test data are shown in table 1.
Table 1 differences in performance between examples 1, 2, 3 and comparative examples 1, 2
Figure BDA0002909914070000091
Figure BDA0002909914070000101
Figure BDA0002909914070000111
According to the comparison between the above examples and comparative examples, the combined melt index of the examples is high, and a larger expansion ratio can be obtained by built-up crosslinking. The proportion of the high-low temperature crosslinking agent and the addition amount of the auxiliary crosslinking agent also influence the foaming ratio and the surface cell state. In comparative example 1, a compound crosslinking formula is not added, and only a high-temperature crosslinking agent (BIPB) is added, so that the multiplying power of 180 ℃/15min can be reached, but the phenomena of hole breaking and collapse can occur after the high temperature is continuously carried out for 190 ℃/60 min. Comparative example 2 does not select a raw material having a large melt index, and although high temperature performance can be satisfied, a high rate product cannot be obtained even if a larger amount of blowing agent is added.
Example 4
In this embodiment, a composite cross-linking agent is first provided, which includes the following components in parts by weight:
Figure BDA0002909914070000112
in this embodiment, the filler is selected from barium sulfate.
In this embodiment, the high temperature crosslinking agent is selected from dicumyl peroxide.
In an embodiment, the low temperature cross-linking agent is selected from dibenzoyl peroxide (BPO).
In this embodiment, the auxiliary crosslinking agent is selected from pentaerythritol triacrylate.
The preparation method of the composite cross-linking agent comprises the step of uniformly mixing in a low-speed mixer according to a set proportion relation to obtain the composite cross-linking agent.
In a second aspect of the present embodiment, there is provided an acoustic expansion material, which comprises the following components in parts by weight:
Figure BDA0002909914070000121
in this example, the ethylene-butyl acrylate copolymer had a melt index of 10 to 40g/10 min.
In this embodiment, the first ethylene-vinyl acetate copolymer has a melt index of 0.5-10g/10 min.
In this embodiment, the second ethylene-vinyl acetate copolymer has a melt index of > 20g/10 min.
In this example, the ethylene-octene copolymer has a melt index of 10-20g/10 min.
In this embodiment, the release agent is selected from oleamide.
In this embodiment, the filler is selected from barium sulfate.
In this embodiment, the blowing agent is selected from AC blowing agents.
In this embodiment, the co-blowing agent is selected from baking soda.
In this embodiment, the heat stabilizer is selected from rare earth heat stabilizers.
In this embodiment, the tackifying resin is selected from C5 resins.
In this embodiment, the flame retardant is selected from rare earth oxides among metal oxides.
In this example, the antioxidant is selected from pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010).
In a third aspect of this embodiment, a method for preparing the sound-insulating expanded material is provided, in which a composite cross-linking agent is pre-blended and mixed, then the composite cross-linking agent is mixed with other components, and the mixture is placed in a low-speed mixer and fully stirred; preheating the extruder to 65 ℃, putting down the mixer after the extrusion temperature is stabilized at 65 ℃, stirring the mixture uniformly in advance, extruding and granulating according to an extrusion process, drying, packaging and warehousing.
The fourth aspect of this embodiment provides a car body cavity sound insulation expansion block product, and the car body cavity sound insulation expansion block product is obtained by performing secondary injection molding on the sound insulation expansion material.
In a fifth aspect of the present embodiment, a method for preparing the car body cavity sound insulation expansion block product is provided, which includes the following steps: the injection molding comprises single-color injection molding and double-color injection molding; and (3) firstly performing injection molding on the PA66 framework according to the injection molding process requirement, then performing secondary injection molding according to the injection molding process requirement of the sound insulation expansion material, preparing the sound insulation expansion material into a finished product, and inspecting, packaging and warehousing.
Example 5
In this embodiment, a composite cross-linking agent is first provided, which includes the following components in parts by weight:
Figure BDA0002909914070000131
in this embodiment, the filler is selected from talc.
In this embodiment, the high temperature crosslinking agent is selected from odorless DCP.
In an embodiment, the low temperature cross-linking agent is selected from dibenzoyl peroxide (BPO).
In this embodiment, the co-crosslinking agent is selected from triethylene propyl isocyanurate.
The preparation method of the composite cross-linking agent comprises the step of uniformly mixing in a low-speed mixer according to a set proportion relation to obtain the composite cross-linking agent.
In a second aspect of the present embodiment, there is provided an acoustic expansion material, which comprises the following components in parts by weight:
Figure BDA0002909914070000132
Figure BDA0002909914070000141
in this example, the ethylene-butyl acrylate copolymer had a melt index of 10 to 40g/10 min.
In this embodiment, the first ethylene-vinyl acetate copolymer has a melt index of 0.5-10g/10 min.
In this embodiment, the second ethylene-vinyl acetate copolymer has a melt index of > 20g/10 min.
In this example, the ethylene-octene copolymer has a melt index of 10-20g/10 min.
In this embodiment, the release agent is selected from oleamide.
In this embodiment, the filler is selected from talc.
In this embodiment, the blowing agent is selected from OBSH-type blowing agents.
In this embodiment, the co-blowing agent is selected from modified urea.
In this embodiment, the heat stabilizer is selected from lead salt heat stabilizers.
In this embodiment, the tackifying resin is selected from epoxy resins.
In this embodiment, the flame retardant is selected from phosphorus-based flame retardants.
In this example, the antioxidant is selected from N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine (antioxidant KY 1098).
In a third aspect of this embodiment, a method for preparing the sound-insulating expanded material is provided, in which a composite cross-linking agent is pre-blended and mixed, then the composite cross-linking agent is mixed with other components, and the mixture is placed in a low-speed mixer and fully stirred; preheating the extruder to 115 ℃, putting down the mixer after the extrusion temperature is stabilized at 115 ℃ and stirring the mixture uniformly in advance, extruding and granulating according to an extrusion process, drying, packaging and warehousing.
The fourth aspect of this embodiment provides a car body cavity sound insulation expansion block product, and the car body cavity sound insulation expansion block product is obtained by performing secondary injection molding on the sound insulation expansion material.
In a fifth aspect of the present embodiment, a method for preparing the car body cavity sound insulation expansion block product is provided, which includes the following steps: the injection molding comprises single-color injection molding and double-color injection molding; and (3) firstly performing injection molding on the PA66 framework according to the injection molding process requirement, then performing secondary injection molding according to the injection molding process requirement of the sound insulation expansion material, preparing the sound insulation expansion material into a finished product, and inspecting, packaging and warehousing. The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (23)

1. The composite cross-linking agent is characterized by comprising the following components in parts by weight:
Figure FDA0002909914060000011
2. the composite crosslinking agent of claim 1, wherein the filler is selected from barium sulfate, calcium carbonate, talc, diatomaceous earth, and rare earth fillers.
3. The composite crosslinking agent according to claim 1, wherein the high temperature crosslinking agent is selected from dicumyl peroxide or 1,3-1, 4-di (t-butylperoxyisopropyl benzene) benzene, preferably 1,3-1, 4-di (t-butylperoxyisopropyl benzene) benzene.
4. The composite crosslinking agent of claim 1, wherein the low temperature crosslinking agent is selected from dibenzoyl peroxide.
5. The composite crosslinking agent according to claim 1, wherein the co-crosslinking agent is selected from the group consisting of vinylmethyl triisocyanurate, trivinyl isocyanurate, dipentaerythritol pentaacrylate or pentaerythritol triacrylate, dipentaerythritol hexaacrylate or trimethylolpropane trimethacrylate.
6. The sound insulation expansion material is characterized by comprising the following components in parts by weight:
Figure FDA0002909914060000012
Figure FDA0002909914060000021
7. the acoustic intumescent material of claim 6 wherein said ethylene acrylate copolymer has a melt index of 10 to 40g/10 min.
8. The acoustic expansion material of claim 6, wherein the first ethylene-vinyl acetate copolymer has a melt index of 0.5 to 10g/10 min.
9. The acoustic expansion material of claim 6, wherein the ethylene-vinyl acetate copolymer II has a melt index of > 20g/10 min.
10. The acoustic expansion material of claim 6, wherein the ethylene-octene copolymer has a melt index of 10-20g/10 min.
11. The acoustic intumescent material of claim 6 wherein said release agent is selected from the group consisting of oleic acid compounds.
12. The acoustic expansion material of claim 6, wherein the filler is selected from the group consisting of barium sulfate, calcium carbonate, talc, diatomaceous earth, and rare earth fillers.
13. The acoustic intumescent material of claim 6 wherein said blowing agent is selected from one or both of an AC blowing agent or an OBSH class blowing agent.
14. The acoustic intumescent material of claim 6 wherein said co-blowing agent is selected from zinc oxide, baking soda or modified urea.
15. The expanded sound-insulating material according to claim 6, wherein the heat stabilizer is selected from the group consisting of a lead salt-based heat stabilizer, an organotin-based heat stabilizer, a metal soap-based heat stabilizer, a rare earth-based heat stabilizer and zinc stearate.
16. The acoustic intumescent material of claim 6 wherein said tackifying resin is selected from the group consisting of C5 resins, C9 resins, C5/C9 hybrid resins, and epoxy resins.
17. The acoustic intumescent material of claim 6 wherein said flame retardant is selected from the group consisting of metal oxide flame retardants, phosphorus based flame retardants, silicone flame retardants, and metal borides.
18. The sound-insulating expanded material as claimed in claim 6, wherein the antioxidant is selected from antioxidant B225, antioxidant KY1098, antioxidant 1010 and antioxidant 168.
19. A method for producing an acoustic expansion material according to any one of claims 6 to 18, wherein the acoustic expansion material is obtained by preliminarily mixing the composite crosslinking agent and then mixing the composite crosslinking agent with other components.
20. The process for the preparation of the sound-insulating expanded material as claimed in claim 19, which comprises the steps of:
(1) preparing a composite cross-linking agent: weighing 60-75 parts by weight of filler, 15-20 parts by weight of high-temperature crosslinking agent, 1-4 parts by weight of low-temperature crosslinking agent and 5-8 parts by weight of auxiliary crosslinking agent, and fully stirring in a low-speed mixer for later use;
(2) preparing a sound insulation expansion material: 0-50 parts of ethylene-acrylate copolymer, 10-30 parts of ethylene-vinyl acetate copolymer I, 10-30 parts of ethylene-vinyl acetate copolymer II and 10-30 parts of ethylene-octene copolymer, after weighing, adding white oil or epoxidized soybean oil and stirring uniformly, then sequentially weighing 0.5-1.2 parts of release agent, 5-20 parts of filler, 1-20 parts of foaming agent, 0.5-2 parts of heat stabilizer, 1-15 parts of tackifying resin, 5-15 parts of composite crosslinking agent, 0.6-1.5 parts of flame retardant and 0.6-1.5 parts of antioxidant, and putting into a low-speed mixer and stirring fully;
(3) preheating the extruder to 65-115 ℃, putting down the mixer after the extrusion temperature is stabilized at 65-115 ℃ and stirring the mixture uniformly in advance, extruding and granulating according to an extrusion process, drying and packaging.
21. A car body cavity sound insulation expansion block product, which is characterized in that the sound insulation expansion material of claims 6-18 is subjected to secondary injection molding to obtain the car body cavity sound insulation expansion block product.
22. The method for preparing the vehicle body cavity acoustic expansion block product of claim 21, comprising the steps of:
(4) the injection molding comprises single-color injection molding and double-color injection molding; and (3) firstly performing injection molding on the PA66 framework according to the injection molding process requirement, then performing secondary injection molding according to the injection molding process requirement of the sound-insulation expansion material, preparing the sound-insulation expansion material into a finished product, and inspecting and packaging.
23. Use of the acoustic expansion material according to any of claims 6 to 18, for the preparation of acoustic expansion blocks for vehicle body cavities.
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