A method and formula application for recycling thermosetting plastic BMC waste

Abstract

The present invention discloses a method and formula application for recycling thermosetting plastic BMC waste, which is used as BMC filling material by reprocessing and recycling, and at the same time, some problems existing in crushing and granulation are improved, as well as the selection of product applications. The method comprises the following steps: (1) classification; BMC waste is classified into: natural color material and colored material; (2) coarse crushing; the classified BMC waste is crushed and impurities are removed; a crusher is used for crushing and a vibrating plate is used for sieving to remove impurities; (3) granulation and grinding into particles; an ultra-fine pulverizer is used for granulation preparation; (4) filtering; the particle size of the particles is screened, and particles with a size smaller than 90 mesh are retained; particles with a size larger than 90 mesh are granulated and ground again; (5) classification; the particles are classified by particle size; (6) collection; dust is collected by bag dust collection, surface treatment is performed, and finished particles are packaged to obtain BMC thermosetting raw powder.

Description

Technical Field

[0001] The invention belongs to the technical field of BMC materials, and in particular relates to a method for recycling thermosetting plastic BMC waste and a formula application. Background Art

[0002] BMC material is the abbreviation of Bulk molding compounds, which is bulk molding compound. It is often called unsaturated polyester bulk molding compound in China. Its main raw materials are UP (unsaturated resin), GF (chopped glass fiber), MD (filler calcium carbonate) and various additives, which are fully mixed to form a bulk prepreg for injection molding or compression molding. Bulk molding compound (BMC) has excellent flow characteristics, insulation and flame retardancy, and is very suitable for various applications that require precise details and dimensions. BMC can be used as a plastic encapsulation material for plastic encapsulated motors, and can also be used to make indoor electronic control plastic parts for air conditioners (such as indoor electronic control boxes for split wall-mounted air conditioners), etc. It has good flame retardancy and heat resistance.

[0003] With the continuous expansion of the application field of thermosetting plastic BMC, the continuous development of production scale and the arrival of the peak period of destruction of various electronic and electrical products, the amount of thermosetting plastic BMC waste has increased significantly. In response to the call for resource conservation, our company has conducted research on the recycling of thermosetting plastic waste and implemented measures to reduce the output and harm of solid waste. Summary of the invention

[0004] In view of the shortcomings of the above background technology, the purpose of the present invention is to provide a method and formula application for recycling thermosetting plastic BMC waste, which can be reprocessed and recycled for use as BMC filling materials, while improving some problems existing in the use of crushing and granulation, as well as the selection of product applications.

[0005] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0006] A method for recycling thermosetting plastic BMC waste comprises the following steps:

[0007] (1) Classification: Classify BMC waste into natural color materials and colored materials;

[0008] (2) Rough crushing: The classified BMC waste is crushed and impurities are removed; a crusher is used for crushing and a vibrating plate is used for sieving to remove impurities;

[0009] (3) Granulate and grind into particles; use an ultra-fine grinder to prepare the particles; the particle size is classified into two specifications:

[0010] 90-325 mesh: called BMC thermosetting powder-200; ≥325 mesh: called BMC thermosetting powder-400;

[0011] (4) Filtration: The particles are sieved and particles with a size smaller than 90 mesh are retained; particles with a size larger than 90 mesh are granulated and ground again;

[0012] (5) Classification: The particles are classified by particle size;

[0013] (6) Collection: using bag dust collection to collect dust, surface treatment, packaging finished particles, and obtaining BMC thermosetting raw powder.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the surface treatment uses a high-speed mixing device to modify the surface of the BMC thermosetting raw powder; a stearic acid coupling agent is used to chemically coat the surface of the BMC thermosetting raw powder, change the polarity of the inorganic surface, and increase the compatibility of the powder with the resin to obtain a BMC thermosetting surface modified powder.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: Surface treatment: using silane, titanate and polyphosphate coupling agents to chemically coat the surface of BMC thermosetting raw powder, change the polarity of the inorganic surface, increase the compatibility of the powder and the resin, and obtain BMC thermosetting surface modified powder.

[0016] On the basis of the above scheme and as a preferred scheme of the above scheme: it includes the following components: 100 parts by weight of basic resin; 50-150 parts by weight of heavy calcium; 0-100 parts by weight of BMC thermosetting raw powder; 100 parts by weight of auxiliary agent; and 70 parts by weight of glass fiber.

[0017] A preparation formula for a dining table turntable according to the recycling method comprises the following components: 100 parts by weight of a basic resin; 170 parts by weight of a BMC thermosetting surface modified powder; 100 parts of an auxiliary agent; and 60 parts of glass fiber.

[0018] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0019] The thermosetting plastic BMC waste recycling method and formula application of the present invention can recycle and reuse BMC thermosetting material solid waste, and realize the recycling preparation of BMC thermosetting raw powder from BMC waste;

[0020] The oil absorption value of BMC thermosetting original powder is too high and needs to be improved, that is, the surface of BMC thermosetting powder needs to be modified; the oil absorption value of BMC thermosetting powder should be brought to the normal parameter value of ordinary heavy calcium carbonate or slightly higher than the normal parameter value, so that BMC thermosetting surface modified powder can replace ordinary heavy calcium carbonate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a recycling schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the production transformation of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to specific embodiments in conjunction with the accompanying drawings;

[0024] This embodiment provides a method and formula application for recycling thermosetting plastic BMC waste, comprising the following steps:

[0025] (1) Classification: Classify BMC waste into natural color materials and colored materials;

[0026] (2) Rough crushing: The classified BMC waste is crushed and impurities are removed; a crusher is used for crushing and a vibrating plate is used for sieving to remove impurities;

[0027] (3) Granulate and grind into particles; use an ultra-fine grinder to prepare the particles; the particle size is classified into two specifications:

[0028] 90-325 mesh: called BMC thermosetting powder-200; ≥325 mesh: called BMC thermosetting powder-400;

[0029] (4) Filtration: The particles are sieved and particles with a size smaller than 90 mesh are retained; particles with a size larger than 90 mesh are granulated and ground again;

[0030] (5) Classification: The particles are classified by particle size;

[0031] (6) Collection: using bag dust collection to collect dust, surface treatment, packaging finished particles, and obtaining BMC thermosetting raw powder.

[0032] As mentioned above, the particle size, whiteness and oil absorption value of ordinary heavy calcium and recycled BMC thermosetting raw powder were compared in the experiment;

[0033] Table 1: BMC thermosetting raw powder

[0034]

[0035] Through the above-mentioned physical property test of BMC thermosetting raw powder, the test results are as follows:

[0036] (1) Appearance whiteness: Compared with ordinary heavy calcium, the whiteness of BMC thermosetting raw powder is significantly reduced, which reduces the appearance quality;

[0037] (2) Oil absorption value: Filler is the main cost-reducing material in BMC formula. The oil absorption of BMC thermosetting raw powder is significantly higher than that of ordinary heavy calcium. Excessive oil absorption directly leads to high formula cost.

[0038] (3) Stability: The particle size distribution is consistent with the mesh size corresponding to ordinary heavy calcium.

[0039] A BMC mold material formula prepared according to a recycling method comprises the following components: 100 parts by weight of basic resin; 50-150 parts by weight of heavy calcium; 0-100 parts by weight of BMC thermosetting raw powder; 100 parts by weight of auxiliary agent; and 70 parts by weight of glass fiber.

[0040] As mentioned above, the effect of adding different amounts of BMC thermosetting raw powder on the properties of BMC mold material was tested;

[0041] Table 2: BMC mold material properties

[0042]

[0043] The above experimental data show that BMC thermosetting raw powder has two disadvantages in product use:

[0044] (1) Large color difference deviation: Products with high appearance requirements cannot be used directly, while products with low appearance requirements or black products can be used directly;

[0045] (2) Molding fluidity: As the amount of BMC thermosetting raw powder added increases, the fluidity of the product during molding decreases. When the amount of BMC thermosetting raw powder added is 50 parts, the molding fluidity decreases by 10%, which cannot meet the molding process conditions and cannot be used;

[0046] If the amount of additives added to the BMC thermosetting raw powder is reduced and the material molding fluidity is consistent with that of ordinary heavy calcium, the BMC thermosetting raw powder at this time will be reduced by 50 parts due to its high oil absorption value, and the amount of mold material used will be too low, resulting in a significant increase in the product formula cost, and exceeding the cost of using ordinary heavy calcium in the product, which does not meet the purpose of BMC thermosetting powder resource recycling and reuse.

[0047] In summary:

[0048] (1) The whiteness of the BMC thermosetting raw powder needs to be evaluated and the product selected for use;

[0049] (2) The oil absorption value of the original BMC thermosetting powder is too high and needs to be improved, that is, the surface of the BMC thermosetting powder needs to be modified.

[0050] The problems with the prepared BMC thermosetting raw powder in product use are:

[0051] Table 3: Oil absorption value

[0052]

[0053]

[0054] The oil absorption value of the BMC thermosetting raw powder currently processed is too large and cannot replace ordinary heavy calcium for normal use; therefore, the following improvement plan is made to address this problem: the surface of the BMC thermosetting powder is treated.

[0055] Furthermore, the surface treatment uses a high-speed mixing device to modify the surface of the BMC thermosetting raw powder; a stearic acid coupling agent is used to chemically coat the surface of the BMC thermosetting raw powder, change the polarity of the inorganic surface, and increase the compatibility of the powder with the resin, so as to obtain a BMC thermosetting surface modified powder.

[0056] As mentioned above, the surface modification experimental data are as follows:

[0057] Table 4: Surface treatment

[0058]

[0059]

[0060] Results: The oil absorption value was not significantly improved by using stearic acid coupling agent to modify the surface of mixed powders such as BMC thermosetting raw powder.

[0061] Furthermore, by using coupling agents such as silane, titanate and polyphosphate to chemically coat the surface of BMC thermosetting raw powder, changing the polarity of the inorganic surface and increasing the compatibility of the powder with the resin, BMC thermosetting surface modified powder is obtained.

[0062] As described above, the experiment was carried out and the following experimental scheme data were obtained;

[0063] Table 5: Surface treatment

[0064]

[0065]

[0066] result:

[0067] (1) The results of the surface modification experiments using titanate and stearic acid are consistent, and the improvement of oil absorption value is not obvious;

[0068] (2) The oil absorption value is improved but not significantly when silane coupling agent is used for surface modification compared with stearic acid coupling agent;

[0069] (3) The surface is modified by using polyphosphate coupling agents, and the oil absorption value is significantly reduced and is equivalent to that of ordinary heavy calcium;

[0070] In summary:

[0071] The data show that the experimental purpose is met: the oil absorption value of BMC thermosetting surface modified powder reaches the normal parameter value of ordinary heavy calcium or slightly higher than the normal parameter value;

[0072] The experimental results show that the use of polyphosphate coupling agents can modify the surface of BMC thermosetting raw powder and achieve the effect of using ordinary heavy calcium in products. The surface modified BMC thermosetting powder plays a role of substitution;

[0073] The finished product of the dining table turntable needs to be sprayed on the surface, so the appearance requirements are not high. BMC thermosetting powder can meet the formability and mechanical property requirements of the product. The monthly demand for this product is 80 tons. According to the usage of 40%, each use can consume about 32 tons of BMC thermosetting raw powder.

[0074] A formula for preparing a dining table turntable by using BMC thermosetting surface modified powder comprises the following components: 100 parts by weight of basic resin; 170 parts by weight of BMC thermosetting surface modified powder; 100 parts of auxiliary agent; and 60 parts of glass fiber.

[0075] The formula experiment is as follows:

[0076] Table 6: Dining table turntable

[0077]

[0078] result:

[0079] The experimental results of using BMC thermosetting surface modified powder instead of ordinary heavy calcium show that its mechanical properties and molding fluidity are consistent with those of using ordinary heavy calcium in the product formula.

[0080] Formula cost comparison experiment of ordinary heavy calcium, BMC thermosetting raw powder and BMC thermosetting surface modified powder;

[0081] Table 7: Dining table turntable

[0082]

[0083]

[0084] As mentioned above, the above recycling and reuse method for BMC thermosetting product waste is reasonable and feasible, and can have practical applications, responding to the call for resource recycling and sustainable development.

[0085] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the present invention, unless otherwise clearly specified and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection;

[0087] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for recycling thermosetting plastic BMC waste, characterized in that: The following steps are involved: (1) Classification: Classify BMC waste into natural color materials and colored materials; (2) Rough crushing: The classified BMC waste is crushed and impurities are removed; a crusher is used for crushing and a vibrating plate is used for sieving to remove impurities; (3) Granulate and grind into particles; use an ultra-fine grinder to prepare the particles; the particle size is classified into two specifications: 90-325 mesh: called BMC thermosetting powder-200; ≥325 mesh: called BMC thermosetting powder-400; (4) Filtration: The particles are sieved and particles with a size smaller than 90 mesh are retained; particles with a size larger than 90 mesh are granulated and ground again; (5) Classification: The particles are classified by particle size; (6) Collection: using bag dust collection to collect dust, surface treatment, packaging finished particles, and obtaining BMC thermosetting raw powder; Surface treatment: The polyphosphate coupling agent is used to chemically coat the surface of the BMC thermosetting raw powder, change the polarity of the inorganic surface, and increase the compatibility of the powder with the resin to obtain the BMC thermosetting surface modified powder; The preparation formula of the dining table turntable includes the following components: 100 parts by weight of basic resin; 170 parts by weight of BMC thermosetting surface modified powder; 100 parts of additives; 60 parts of glass fiber.

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