Air conditioner chassis and preparation method thereof

Abstract

The present invention provides a composite material for an air conditioner chassis, comprising the following raw materials in parts by weight: 65-85 parts of HIPS, 5-10 parts of toughening agent, 5-20 parts of surface-treated hollow glass microspheres, 3-5 parts of flame retardant, and 0.1-1 parts of antioxidant. The present invention innovatively adds hollow glass microspheres to the formula to achieve unique properties such as weight reduction and cost reduction, anti-shrinkage warping, sound insulation and noise reduction. The surface of the hollow glass microspheres is specially treated to achieve good bonding with the toughening system, forming an "island structure" in the main substrate HIPS. HIPS acts as an "island" to provide strength, and the hollow glass microspheres are wrapped by the "sea" phase of the toughening system, avoiding the loss of toughness of the material due to the direct addition of the hollow glass microspheres, and the modified toughening system has a stronger bonding performance, achieving better mechanical performance indicators.

Description

Technical Field

[0001] The present invention relates to the technical field of materials, and in particular to an air conditioner chassis and a preparation method thereof. Background Art

[0002] At present, most air conditioner chassis are made of galvanized metal plates with anti-corrosion treatment on the surface. After long-term use, the anti-corrosion treatment layer on the surface fails and rust occurs. In severe cases, corrosion occurs and causes water leakage. In addition, the metal chassis is heavy, and metal resonance is generated when the air conditioner is running, which increases the noise.

[0003] Problems such as high cost of existing materials, severe shrinkage and warping, vibration and noise have always plagued the promotion of materials in this direction.

[0004] Therefore, it is very necessary to develop a composite material that can be used on the air conditioner chassis, which has the characteristics of high strength, light weight, acid and alkali resistance, and flame retardancy. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a composite material for an air conditioner chassis. The composite material provided by the present invention has high bonding strength, good toughness and light weight.

[0006] The present invention provides a composite material for an air conditioner chassis, comprising the following raw materials in parts by weight:

[0007] HIPS 65-85 parts, toughening agent 5-10 parts, surface treated hollow glass microspheres 5-20 parts, flame retardant 3-5 parts, antioxidant 0.1-1 part.

[0008] Preferably, the HIPS is selected from PH-60, PH-88, 4241 and 6351 of French Doyle;

[0009] The toughening agent is selected from one or more composites of POE, EPDM, EVA, and EAA;

[0010] The flame retardant is selected from one of aluminum hydroxide, phosphate ester and zinc borate;

[0011] The antioxidant is selected from one of 1010, 168, B215 and BHT.

[0012] Preferably, the treatment agent of the surface-treated hollow glass microspheres is one or two of phenolic resin 2095, silane coupling agent KH550, silicon 69 and epoxy resin E54.

[0013] Preferably, the hollow glass microspheres have a particle size of 20 to 40 μm and a specific gravity of 0.4 to 0.6 g / cm 3 , the compressive strength is between 8000 and 20000Psi.

[0014] Preferably, the air conditioner chassis comprises the following raw materials in parts by weight:

[0015] HIPS 67-83 parts, toughening agent 6-10 parts, hollow glass microspheres 7-18 parts, flame retardant 3-5 parts, antioxidant 0.2-0.8 parts.

[0016] The present invention provides an air-conditioning chassis, comprising the composite material described in any one of the above technical solutions.

[0017] The present invention provides a method for preparing the air conditioner chassis described in the above technical solution, comprising the following steps:

[0018] HIPS, toughening agent, flame retardant, antioxidant and surface treated hollow glass microspheres are mixed, extruded and injection molded to obtain the product.

[0019] Preferably, the preparation method of the surface-treated hollow glass microspheres is specifically as follows:

[0020] The dried hollow glass microbeads are added into the treating agent solution, stirred, dried and filtered.

[0021] Preferably, the treatment agent solution is an ethanol solution of the treatment agent; the treatment agent is one or two of phenolic resin 2095, silane coupling agent KH550, silicon 69 and epoxy resin E54;

[0022] The mass concentration of the treating agent in the treating agent solution is 5-10wt%.

[0023] Preferably, the stirring speed is 300 r / min, the stirring temperature is controlled at 50° C., and the stirring time is 30 to 50 min;

[0024] The drying condition is 100° C. for 2 to 3 hours.

[0025] Compared with the prior art, the present invention provides a composite material for air-conditioning chassis, including the following raw materials in parts by weight: 65-85 parts of HIPS, 5-10 parts of toughening agent, 5-20 parts of surface-treated hollow glass microspheres, 3-5 parts of flame retardant, and 0.1-1 part of antioxidant. The present invention innovatively adds hollow glass microspheres to the formula to achieve unique properties such as weight reduction and cost reduction, anti-shrinkage warping, sound insulation and noise reduction. The surface of the hollow glass microspheres is specially treated to achieve good bonding with the toughening system, forming an "island structure" in the main substrate HIPS. HIPS acts as an "island" to provide strength, and the hollow glass microspheres are wrapped by the "sea" phase of the toughening system, avoiding the loss of toughness of the material due to the direct addition of hollow glass microspheres, and the modified toughening system has a stronger bonding performance, achieving better mechanical performance indicators. DETAILED DESCRIPTION

[0026] The present invention provides an air conditioner chassis and a method for preparing the same. Those skilled in the art can refer to the contents of this article and appropriately improve the process parameters to achieve the same. It should be particularly noted that all similar replacements and modifications are obvious to those skilled in the art, and they all fall within the scope of protection of the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications of this article without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0027] The present invention provides a composite material for an air conditioner chassis, comprising the following raw materials in parts by weight:

[0028] HIPS 65-85 parts, toughening agent 5-10 parts, surface treated hollow glass microspheres 5-20 parts, flame retardant 3-5 parts, antioxidant 0.1-1 part.

[0029] The composite material for air conditioner chassis provided by the present invention comprises 65 to 85 parts by weight of HIPS as raw materials; preferably 67 to 83 parts by weight; and more preferably 69 to 80 parts by weight.

[0030] The present invention does not limit the HIPS, and it is known to those skilled in the art. The HIPS is selected from PH-60, PH-88, 4241 and 6351 of Dole, France.

[0031] The composite material for the air conditioner chassis provided by the present invention comprises raw materials including 5 to 10 parts by weight of a toughening agent, and preferably including 6 to 10 parts by weight of a toughening agent.

[0032] The toughening agent of the present invention is preferably selected from one or more composites of POE, EPDM, EVA, and EAA. The present invention does not limit the source thereof, and commercially available ones are sufficient.

[0033] The composite material for air conditioner chassis provided by the present invention comprises 5 to 20 parts by weight of surface-treated hollow glass microspheres as raw materials; preferably 7 to 18 parts by weight; more preferably 8 to 16 parts by weight.

[0034] According to the present invention, the preparation method of the surface-treated hollow glass microspheres is specifically as follows:

[0035] The dried hollow glass microbeads are added into the treating agent solution, stirred, dried and filtered.

[0036] More preferably, specifically:

[0037] Weigh the hollow glass microspheres and the treating agent, and dry the hollow glass microspheres at 100° C. for 2 to 3 hours;

[0038] The treating agent is put into the solvent and mixed evenly. The treating agent solution is an ethanol solution of the treating agent. The mass concentration of the treating agent in the treating agent solution is 5-10wt%, preferably 6-9%.

[0039] The dried hollow glass microbeads are slowly thrown into the alcohol solution for stirring at a stirring speed of 300 r / min, a stirring temperature controlled at 50° C., and a stirring time of 30 to 50 minutes. After the stirring is completed, the solution is filtered and dried for standby use.

[0040] The treating agent of the present invention is one or two of phenolic resin 2095, silane coupling agent KH550, silicon 69 and epoxy resin E54.

[0041] The hollow glass microspheres of the present invention have a particle size of 20 to 40 μm and a specific gravity of 0.4 to 0.6 g / cm 3 , the compressive strength is between 8000 and 20000Psi.

[0042] The particle size of the present invention is selected to be 20-40 μm to ensure that the mechanical properties of HIPS are less affected; the specific gravity is 0.4-0.6 g / cm 3 , ensuring that the effect of reducing density is more obvious, the strength is between 8000 and 20000Psi, because hollow glass microspheres are hollow closed-cell spheres with a wall thickness of 1 to 2μm. Only when the rolling strength is sufficient to ensure the integrity of its structure can the functional characteristics of hollow glass microspheres be brought into play. Experiments have verified that the strength above 8000Psi combined with side feeding can ensure that the breakage rate is less than 5%; this time, Zhengzhou Saint-Light product HS46 was selected.

[0043] The present invention firstly dries at 100°C for 2 hours to reduce the moisture content on the surface of the microbeads and ensure the coating effect in the solution; the treatment agent uses alcohol as a solvent, which has low cost and good dissolution effect. In particular, a solution concentration of 5 to 10% is selected. It has been verified that within this concentration range, the surface of the microbeads can be uniformly coated and the density of the microbeads is slightly increased by 0.02 g / cm 3 The microbeads should be thrown slowly to ensure that the microbeads do not clump in the solution and are dispersed more evenly in the solution faster. The stirring speed should be controlled at 300r / min. Too low a speed will lead to uneven dispersion of the microbeads in the solution, while too high a speed will lead to too low and uneven sizing thickness of the treatment agent on the surface of the microbeads, and even cause the microbeads to break at a higher rotation speed. The temperature should be controlled at 50℃. Too low a temperature will lead to reduced activity of the treatment agent and difficulty in sizing, while too high a temperature will lead to decreased performance of the treatment agent and affect subsequent use. The stirring time should be controlled at 30-50min to ensure uniform sizing and moderate thickness.

[0044] The present invention firstly applies phenolic resin solution to the surface of micro-beads to achieve good bonding, then applies a treatment agent to the phenolic resin coating layer, and when the heated micro-beads are mixed and dispersed into the toughening agent in the screw, the phenolic resin starts a thermosetting reaction and the treatment agent promotes the reaction of the toughening agent to vulcanize, thereby achieving cross-linking of the molecular network and forming good bonding performance. Compared with conventional coupling agent treatment, the bonding performance is better.

[0045] The composite material for air conditioner chassis provided by the present invention comprises raw materials including 3 to 5 parts by weight of flame retardant, preferably 3 parts by weight, 4 parts by weight or 5 parts by weight.

[0046] The flame retardant of the present invention is selected from one of aluminum hydroxide, phosphate ester and zinc borate.

[0047] The composite material for air conditioner chassis provided by the present invention comprises raw materials including 0.1 to 1 weight part of antioxidant, preferably 0.2 to 0.8 weight part, and more preferably 0.3 to 0.7 weight part.

[0048] Specifically, the antioxidant is selected from one of 1010, 168, B215 and BHT.

[0049] In some preferred embodiments of the present invention, the air conditioner chassis comprises the following raw materials in parts by weight:

[0050] HIPS 67-83 parts, toughening agent 6-10 parts, hollow glass microspheres 7-18 parts, flame retardant system 3-5 parts, antioxidant 0.2-0.8 parts.

[0051] In some preferred embodiments of the present invention, the air conditioner chassis comprises the following raw materials in parts by weight:

[0052] HIPS 69-80 parts, toughening agent 7-10 parts, hollow glass microspheres 8-16 parts, flame retardant system 3-5 parts, antioxidant 0.3-0.7 parts.

[0053] The present invention provides an air-conditioning chassis, comprising the composite material described in any one of the above technical solutions.

[0054] The air-conditioning chassis of the present invention comprises the composite material described in any one of the above technical solutions. The composite material has been clearly described in the above of the present invention and will not be repeated here.

[0055] The present invention prepares an air-conditioning chassis material with excellent mechanical properties by adding surface-treated hollow glass microspheres and a toughening agent to HIPS. The addition of the hollow glass microspheres gives the air-conditioning chassis unique properties such as low density, reduced resin usage and cost reduction, sound absorption and noise reduction, and low shrinkage and warping.

[0056] The present invention provides a method for preparing the air conditioner chassis described in the above technical solution, comprising the following steps:

[0057] HIPS, toughening agent, flame retardant, antioxidant and surface treated hollow glass microspheres are mixed, extruded and injection molded to obtain the product.

[0058] The invention sets parameters such as temperature and rotation speed of a twin-screw extruder, adds uniformly mixed HIPS, toughening agent, flame retardant and antioxidant into the main feed, and adds treated hollow glass microbeads from the side feed of the twin-screw extruder.

[0059] The extrusion parameters of the present invention are specifically as follows: the extrusion temperature is 195°C in zone 1, 195°C in zone 2, 200°C in zone 3, 200°C in zone 4, 210°C in zone 5, 210°C in zone 6, 215°C in zone 7, 210°C in zone 8, and 220°C in zone 9; the main speed of the extruder is 150r / min, the main feed speed is 10r / min, and the side feed speed is 4r / min.

[0060] The preparation method of the surface-treated hollow glass microspheres of the present invention has been clearly described above and will not be repeated here.

[0061] The present invention creatively combines the treatment agent and the toughening agent to work synergistically. The special treatment agent is a combination of phenolic resin 2095 and silicon 69, and the toughening agent is a kind of EPDM. The phenolic resin is diluted by an alcohol solution and coated on the microspheres under suitable process parameters. After being blended and granulated by a twin-screw extruder, EPDM and HIPS have a "sea-island structure". EPDM has good toughness and low hardness as the "sea" phase, while the hollow glass microspheres are micron-sized particles of an inorganic material. When subjected to shear force, they tend to flow toward the "sea" phase. At the temperature in the extruder, the phenolic resin on the surface of the microspheres is Thermosetting cross-linking reaction, the silicon 69 on the surface will produce a vulcanization cross-linking reaction with EPDM at this temperature. At this time, the thermosetting cross-linking reaction of the phenolic resin and the vulcanization cross-linking of the toughening agent EPDM are carried out simultaneously to cause entanglement of the molecular chains, thereby achieving good bonding strength. Because the problem currently encountered by hollow glass microspheres is that the rigidity is increased when added to HIPS, and the toughness is greatly reduced, resulting in the impact strength of the product being too low to meet the use requirements, the present invention achieves better bonding strength while ensuring the toughness of the microspheres added to the material through the synergistic effect between the treating agent and the toughening agent, thereby preparing a high-performance, low-cost, lightweight air-conditioning chassis product.

[0062] In order to further illustrate the present invention, an air conditioner chassis and a preparation method thereof provided by the present invention are described in detail below in conjunction with embodiments.

[0063] Comparative Example 1

[0064] Formula: 96.7 parts HIPS, 3 parts phosphate, 0.3 parts B215; set the twin-screw extruder temperature to 190-200°C, mix the raw materials evenly through the main feed, prepare the modified particles for drying, injection mold mechanical properties test samples, and conduct physical property tests;

[0065] Comparative Example 2

[0066] Formula: 86.7 parts HIPS, 10 parts hollow glass microspheres HS46 (untreated), 3 parts phosphate, 0.3 parts B215; set the temperature of the twin-screw extruder to 190-200°C, mix the raw materials evenly through the main feed, add the hollow glass microspheres from the side feed in proportion, prepare the modified particles for drying, injection mold mechanical properties test samples, and conduct physical property tests;

[0067] Comparative Example 3

[0068] Formula: 76.7 parts HIPS, 10 parts EPDM, 10 parts hollow glass microspheres HS46 (untreated), 3 parts phosphate, 0.3 parts B215; set the temperature of the twin-screw extruder to 190-200°C, mix the raw materials evenly through the main feed, add the hollow glass microspheres from the side feed in proportion, prepare the modified particles for drying, injection mold mechanical properties test samples, and conduct physical property tests;

[0069] Comparative Example 4: 76.7 parts of HIPS, 10 parts of EPDM, 10 parts of hollow glass microspheres HS46 (treated with KH550), 3 parts of phosphate, and 0.3 parts of B215; the temperature of the twin-screw extruder was set at 190-200°C, the raw materials were mixed and added evenly through the main feed, and the hollow glass microspheres were added in proportion from the side feed to prepare modified particles for drying, injection molding mechanical properties test samples, and physical property tests;

[0070] Example 1

[0071] Formula: 76.7 parts HIPS, 10 parts EPDM, 10 parts hollow glass microspheres HS46 (surface treated), 3 parts phosphate, 0.3 parts B215; set the temperature of the twin-screw extruder to 190-200°C, mix the raw materials evenly through the main feed, add the hollow glass microspheres from the side feed in proportion, prepare the modified particles for drying, injection mold mechanical properties test samples, and conduct physical property tests;

[0072]

[0073] It can be seen from the examples that, compared with Example 1, after adding 10 parts of hollow glass microspheres, the density of Example 1 is reduced from 1.06 to 0.95, that is, if the product weighs 1000g, it becomes 896.2g, a weight reduction of 10%; compared with Example 1, it can be seen from Example 2 that the addition of hollow glass microspheres has a relatively large effect on the notched impact, which decreases by 65%. It can be seen from Example 3 and Example 1 that the addition of a toughening agent can improve the toughness, and the toughening agent is directly added to 5.6, which is 47% higher than that of Example 2. After the surface treatment of the microspheres, the notched impact reaches 8.9, which is 157% higher than that of Example 2, which is a significant improvement; both the tensile strength and the flexural strength are greatly improved, which is almost consistent with the performance of the HIPS material without microspheres.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A composite material for an air conditioner chassis, characterized in that: The invention comprises the following raw materials in parts by weight: HIPS 65-85 parts, toughening agent 5-10 parts, surface treated hollow glass microspheres 5-20 parts, flame retardant 3-5 parts, antioxidant 0.1-1 parts; The preparation method of the surface-treated hollow glass microspheres is specifically as follows: adding the dried hollow glass microspheres to a treatment agent solution, stirring, drying, and filtering; the treatment agent solution is an ethanol solution of the treatment agent; the mass concentration of the treatment agent in the treatment agent solution is 5 to 10 wt%; The treating agent of the surface treated hollow glass microspheres is phenolic resin 2095 and silicon 69; The hollow glass microspheres have a particle size of 20 to 40 μm and a specific gravity of 0.4 to 0.6 g / cm 3 , compressive strength is 8000~20000Psi; The toughening agent is selected from EPDM.

2. The composite material according to claim 1, characterized in that The HIPS is selected from PH-60, PH-88, 4241 and 6351 of French Doyle; The flame retardant is selected from one of aluminum hydroxide, phosphate ester and zinc borate; The antioxidant is selected from one of 1010, 168, B215 and BHT.

3. The composite material according to claim 1, characterized in that The air conditioner chassis comprises the following raw materials in parts by weight: HIPS 67-83 parts, toughening agent 6-10 parts, surface treated hollow glass microspheres 7-18 parts, flame retardant 3-5 parts, antioxidant 0.2-0.8 parts.

4. The composite material according to claim 1, characterized in that In the preparation method of the surface-treated hollow glass microspheres, the stirring speed is 300 r / min, the stirring temperature is controlled at 50° C., and the stirring time is 30 to 50 min; and the drying condition is 100° C. for 2 to 3 h.

5. An air conditioning chassis, characterized in that: A composite material comprising any one of claims 1 to 4.

6. A method for preparing the air conditioner chassis according to claim 5, characterized in that: The steps include: HIPS, toughening agent, flame retardant, antioxidant and surface treated hollow glass microspheres are mixed, extruded and injection molded to obtain the product.

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