Reinforcing agent for polyester, its preparation method, polyester cabinet board and its preparation method

Abstract

The present invention belongs to the technical field of the preparation of polyester cabinet plates, and particularly relates to a polyester reinforcing agent and its preparation method, a polyester cabinet plate and its preparation method; the polyester cabinet plate comprises: 100 parts of polyester, 2 to 5 parts of foaming agent, 12 to 20 parts of reinforcing agent, 20 to 100 parts of inorganic filler, 4 to 6 parts of lubricant, 0.2 to 1 part of nucleating agent, 1 to 5 parts of water absorbent; the reinforcing agent comprises: 40 to 50 parts of carrier resin, 0.5 to 5 parts of chain extender, 0.5 to 5 parts of dispersant, 45 to 55 parts of high polymer. The polyester cabinet plate of the present invention does not need to be bonded with an adhesive and the raw materials do not release formaldehyde; the plate prepared by adding the reinforcing agent has high flexural strength and nail holding power; at the same time, it can also shorten the molding cycle and improve the processability of polyester.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparing polyester cabinet boards, and particularly relates to a polyester reinforcing agent and its preparation method, a polyester cabinet board and its preparation method. Background Art

[0002] At present, the boards used for cabinets are mainly density boards and particle boards. The density board, also known as density fiberboard, is a man-made board made from wood fibers or other plant fibers as raw materials, through fiber preparation and application of synthetic resin, and pressed under conditions of heating and pressure. The particle board, also known as particleboard, is a man-made board made by cutting various natural woods such as branches, small-diameter logs, fast-growing woods, and wood chips into fragments of a certain specification, drying them, and mixing them with adhesives, hardeners, waterproofing agents, etc., and pressing them under certain temperature and pressure conditions.

[0003] Adhesives are required in the preparation processes of both density boards and particle boards. The main components of the adhesives are phenolic resin glue or urea-formaldehyde resin glue, both of which will continuously release formaldehyde for a long time, affecting human health, especially more harmful to children, pregnant women, and the elderly.

[0004] With the improvement of people's environmental protection awareness, some improved solutions use the wood-plastic one-step forming technology to replace the cabinet boards containing formaldehyde. For example, cabinet boards are made by extruding polyvinyl chloride and wood powder, which have the characteristics of moisture resistance, waterproofness, and insect resistance. However, the cabinet boards prepared by this method have low flexural strength, poor nail-holding power, high density, heavy board weight, and low service life. There are also some technical solutions to solve such problems through multi-layer composite processes, but such processes are complex and the improvement results are less than satisfactory.

[0005] In view of this, for cabinet boards, how to solve the formaldehyde release problem, and how to improve the flexural strength, nail-holding power of cabinet boards, reduce the board weight, increase the service life, and have a simple preparation process have become research directions worthy of attention. Summary of the Invention

[0006] The purpose of the present invention is to provide a formaldehyde-free, high-nail-holding power polyester cabinet board for the problems of long-term continuous release of formaldehyde in the existing cabinet boards and the problems of low flexural strength, poor nail-holding power, high density, and low service life in the boards obtained by extrusion one-step forming or multi-layer composite technology. The obtained board does not need to be bonded with adhesives and the raw materials used do not release formaldehyde; the board material prepared by adding a reinforcing agent has high flexural strength and high nail-holding power; at the same time, it can also shorten the molding cycle and improve the processability of polyester.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, a polyester reinforcing agent is provided. Based on 100 parts by weight of the total components in the reinforcing agent, the reinforcing agent comprises the following components:

[0009] Carrier resin, 40 - 50 parts, for example, 42 parts, 44 parts, 45 parts, 46 parts, 48 parts;

[0010] Chain extender, 0.5 - 5 parts, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 4 parts, 4.5 parts;

[0011] Dispersant, 0.5 - 5 parts, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 4 parts, 4.5 parts;

[0012] High - molecular polymer, 44 - 55 parts, for example, 45 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts.

[0013] According to the reinforcing agent provided by the present invention, in some embodiments, the carrier resin is selected from at least one of polyethylene, chlorinated polyethylene, ethylene - butyl acrylate copolymer, ethylene - α - olefin copolymer grafted maleic anhydride, and ethylene - α - olefin copolymer.

[0014] In some embodiments, the chain extender is selected from at least one of triglycidyl isocyanurate, glycidyl methacrylate, and other glycidyl acrylate esters.

[0015] In some embodiments, the dispersant is selected from polyethylene glycol and / or polypropylene glycol.

[0016] In some embodiments, by weight parts, the high - molecular polymer comprises the following components:

[0017] 100 parts of monomer composition (based on it as the calculation basis),

[0018] 0.4 - 4.0 parts (such as 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts) of emulsifier,

[0019] 0.01 - 1.0 parts (such as 0.02 parts, 0.04 parts, 0.05 parts, 0.08 parts, 0.1 parts, 0.2 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.8 parts) of initiator,

[0020] 100 - 200 parts (such as 120 parts, 150 parts, 180 parts) of water;

[0021] Among them, based on the sum of the weight parts of each monomer (such as 100), the monomer composition comprises the following monomers:

[0022] 60 to 95 parts (such as, 62 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts) of an alkyl methacrylate, 4 to 30 parts (such as, 5 parts, 6 parts, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 28 parts) of an alkyl acrylate, 1.0 to 5.0 parts (such as, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts) of a carboxylic acid.

[0023] In some embodiments, the alkyl methacrylate is selected from at least one of methyl methacrylate, n-butyl methacrylate, and isobutyl methacrylate;

[0024] In some embodiments, the alkyl acrylates are selected from at least one of n-butyl acrylate, ethyl acrylate, methyl acrylate, isobutyl acrylate, and isooctyl acrylate;

[0025] In some embodiments, the carboxylic acid is selected from at least one of methacrylic acid, acrylic acid, maleic acid, itaconic acid, and fumaric acid.

[0026] In some embodiments, the emulsifier is selected from at least one of sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, sodium dodecyl sulfonate, potassium dodecyl sulfate, sodium stearate, and potassium stearate.

[0027] In some embodiments, the initiator is selected from at least one of potassium persulfate, sodium persulfate, and ammonium persulfate.

[0028] In a second aspect, there is provided a method for preparing an enhancer as described above, the preparation method comprising the following steps:

[0029] (1) Prepare a high molecular polymer: Weigh respectively an alkyl methacrylate, alkyl acrylates, and carboxylic acid as monomers, as well as an emulsifier, an initiator, and water, and stir and mix them evenly. After a polymerization reaction, a polymer emulsion is obtained, and then the high molecular polymer is obtained after drying;

[0030] (2) Weigh respectively a carrier resin, a chain extender, a dispersant, and the high molecular polymer prepared in step (1), and mix them (for example, add them to a high-speed mixer and mix at room temperature) to obtain an enhancer mixture;

[0031] (3) Melt-extrude and pelletize the enhancer mixture prepared in step (2) using a screw extruder to obtain the enhancer.

[0032] In some embodiments, the process conditions of the polymerization reaction for preparing the high molecular polymer in step (1) include: the stirring speed is set to 60 - 500 revolutions per minute (e.g., 70 revolutions per minute, 80 revolutions per minute, 100 revolutions per minute, 200 revolutions per minute, 300 revolutions per minute, 400 revolutions per minute), and the reaction temperature is 50 - 80 °C (e.g., 55 °C, 60 °C, 65 °C, 70 °C, 75 °C).

[0033] In step (2), the mixing and the mixing equipment can be conventional operations in the art; for example, the raw materials can be added to a high-speed mixer for mixing at room temperature.

[0034] In some embodiments, the process conditions of the melt extrusion granulation in step (3) include:

[0035] The barrel temperature of the screw extruder is set to 90 - 110 °C (e.g., 95 °C, 100 °C, 105 °C), the temperature of the die heating zone is set to 95 - 115 °C (e.g., 100 °C, 105 °C, 110 °C), and the temperature of the confluence core is set to 95 - 115 °C (e.g., 100 °C, 105 °C, 110 °C).

[0036] In a third aspect, there is provided a polyester cabinet board without formaldehyde and with high nail-holding power. By weight, the polyester cabinet board comprises the following components:

[0037] (a) 100.0 parts of polyester (calculated based on this),

[0038] (b) 2.0 - 5.0 parts (e.g., 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts) of a foaming agent,

[0039] (c) 12.0 - 20.0 parts (e.g., 13 parts, 14 parts, 15 parts, 16 parts, 18 parts) of a reinforcing agent,

[0040] (d) 20.0 - 100.0 parts (e.g., 22 parts, 25 parts, 30 parts, 40 parts, 50 parts, 60 parts, 70 parts, 80 parts, 90 parts) of an inorganic filler,

[0041] (e) 4.0 - 6.0 parts (e.g., 4.5 parts, 5 parts, 5.5 parts) of a lubricant,

[0042] (f) 0.2 - 1.0 part (e.g., 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.8 part) of a nucleating agent,

[0043] (g) 1.0 - 5.0 parts (e.g., 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts) of a water absorbent;

[0044] Among them, the enhancer is the enhancer as described above or the enhancer prepared by the preparation method as described above.

[0045] According to the polyester sheet for cabinets provided by the present invention, in some embodiments, the density of the polyester sheet for cabinets is 0.35 to 0.80 g / cm 3 , for example, 0.36 g / cm 3 , 0.37 g / cm 3 , 0.38 g / cm 3 , 0.39 g / cm 3 , 0.40 g / cm 3 , 0.42 g / cm 3 , 0.44 g / cm 3 , 0.45 g / cm 3 , 0.50 g / cm 3 , 0.55 g / cm 3 , 0.60 g / cm 3 , 0.65 g / cm 3 , 0.70 g / cm 3 , 0.75 g / cm 3 , 0.78 g / cm 3 .

[0046] According to the polyester sheet for cabinets provided by the present invention, in some embodiments, the polyester is selected from at least one of polyethylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol ester, and polybutylene terephthalate; in some embodiments, the polyester is fiber-grade polyester, bottle-grade polyester, film-grade polyester chips, or recycled polyester.

[0047] In some embodiments, the foaming agent can be an endothermic foaming agent, for example, it can be foaming agent MSA-2215.

[0048] In some embodiments, the inorganic filler is selected from at least one of light calcium carbonate, heavy calcium carbonate, and talcum powder.

[0049] In some embodiments, the lubricant is selected from at least one of polyethylene wax, polypropylene wax, oxidized polyethylene wax, glycerol stearate, pentaerythritol stearate, ethylene bis-stearamide wax, erucamide wax, stearic acid, calcium stearate, and silicone oil.

[0050] In some embodiments, the nucleating agent is selected from at least one of ultrafine talcum powder, nano calcium carbonate, fumed silica, silica aerogel, and graphene.

[0051] In some embodiments, the water absorbent is selected from calcium oxide and / or magnesium oxide.

[0052] In a fourth aspect, there is provided a method for preparing a polyester sheet for a cabinet as described above, comprising the following steps:

[0053] (1) Weigh polyester, foaming agent, reinforcing agent, inorganic filler, lubricant, nucleating agent, and water absorbent respectively, and mix them to obtain a polyester mixture;

[0054] (2) The polyester mixture obtained in step (1) is melt-extruded and skin-foamed by a screw extruder to obtain the polyester sheet for a cabinet.

[0055] According to the method for preparing the polyester sheet for a cabinet provided by the present invention, in some embodiments, the mixing in step (1) can be, for example, adding the raw materials into a high-speed mixer and mixing them evenly at room temperature.

[0056] According to the method for preparing the polyester sheet for a cabinet provided by the present invention, in some embodiments, the process conditions for the melt extrusion and skin foaming in step (2) include:

[0057] The barrel temperature of the screw extruder is set to 190 - 260 °C (such as 195 °C, 200 °C, 210 °C, 220 °C, 240 °C, 250 °C, 255 °C), the temperature of the mold heating zone is set to 200 - 260 °C (such as 205 °C, 210 °C, 220 °C, 240 °C, 250 °C, 255 °C), the temperature of the confluence core is set to 200 - 255 °C (such as 205 °C, 210 °C, 220 °C, 230 °C, 240 °C, 245 °C, 250 °C), and the temperature of the sizing plate is 10 - 35 °C (such as 12 °C, 14 °C, 15 °C, 18 °C, 20 °C, 25 °C, 30 °C, 34 °C).

[0058] Compared with the prior art, the beneficial effects of the technical solution of the present invention mainly lie in:

[0059] The present invention can make a cabinet sheet from a thermoplastic polyester plastic mixture by screw melt extrusion without using an adhesive, and the raw materials used do not release formaldehyde, fundamentally solving the problem of formaldehyde release and reducing the harm caused by formaldehyde to humans; in addition, the polyester in the raw materials can use recycled materials, and the cabinet sheets obtained can be recycled, extending the life cycle of the materials and reducing carbon emissions, belonging to green environmental protection materials.

[0060] The polyester material in the sheet material formula has an obvious melting point range. During the screw extrusion process, after the polyester reaches the melting point temperature, its melt viscosity becomes smaller and the melt strength is also small. This will cause the gas released by the blowing agent in the mixture to not be wrapped after the polyester material foams, resulting in low flexural strength and poor nail-holding force of the sheet material for cabinets prepared. Moreover, due to the low melt strength of the system, inorganic fillers cannot be added to the formula, resulting in high costs. In the present invention, a reinforcing agent is added to the sheet material formula. The main component of the reinforcing agent is a high molecular polymer, which is a high molecular polymer with a long-chain structure synthesized by emulsion polymerization using monomers such as methyl methacrylate and n-butyl acrylate as copolymer monomers. At the same time, functional monomers (such as carboxylic acids such as methacrylic acid, maleic acid, itaconic acid, and fumaric acid) are added during emulsion polymerization to introduce active carboxyl groups. Adding epoxy substances as chain extenders can react with the introduced carboxyl groups, the terminal carboxyl groups, and the terminal hydroxyl groups of the polyester to form a reinforcing system with a network structure, effectively improving the entanglement of molecular chains in the polyester melt, and thus improving the melt strength of the polyester; in the reinforcing agent formula, elastomer polymers such as PE and POE are used as carrier resins. The advantages are: one is that the processing temperature is low, all below the decomposition temperature of the blowing agent; the other is that the melt viscosity is large and it is easy to process and form, and it has good compatibility with acrylate high molecular polymers; in the reinforcing agent formula, PEG and the like are added as dispersants, which can effectively wrap the gas released by the blowing agent in the polyester mixture and improve the solubility of the gas in the polyester material. Therefore, the sheet material prepared by adding this reinforcing agent has high flexural strength and nail-holding force, and because the system has high melt strength, inorganic fillers can be added without affecting the strength performance of the sheet material, greatly saving costs.

[0061] Polyester materials are a type of semi-crystalline high polymer with a slow crystallization rate, and a nucleating agent needs to be added during the processing. In the sheet material formula of the present invention, fine-grained inorganic substances are added as nucleating agents, and at the same time, the crystallization rate of the polyester is shortened by combining the blending processing method, shortening the molding cycle, and improving the processability of the polyester. Polyester materials are prone to hydrolysis. If the polyester or polyester mixture contains a small amount of moisture, the material will cause hydrolysis of the polyester during the screw extrusion process, resulting in molecular chain breakage, which will cause a decrease in material strength and poor processing performance. Therefore, the usual method requires adding a high-temperature drying step before screw extrusion to remove the moisture in the raw materials; in the present invention, a water absorbent is added to the sheet material formula, which can react with the moisture in the polyester or polyester mixture to generate an alkaline substance, and this alkaline substance will not affect the processability of the polyester or polyester mixture, and there is no need to dry and dehydrate at high temperature before extrusion processing, simplifying the production process, reducing energy consumption, and saving costs. In addition, the sheet material for cabinets provided by the present invention is prepared by melt extrusion and skin-forming foaming through a screw extruder, further simplifying the production process, reducing energy consumption, and saving costs.

[0062] The board for cabinets of the present invention has a simple preparation process, low energy consumption, and low cost. The board has high static bending strength and nail-holding power, is green and environmentally friendly, and the formaldehyde release amount is detected according to Clause 4.61 of GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Overlaid Wood-Based Panels", and the result is not detected. Detailed implementation mode

[0063] In order to be able to understand the technical features and content of the present invention in detail, the preferred implementation modes of the present invention will be described in more detail below. Although the preferred implementation modes of the present invention are described in the examples, it should be understood that the present invention can be implemented in various forms and should not be limited by the implementation modes described herein. For those not specified in the examples, they are carried out under conventional conditions or conditions recommended by the manufacturer.

[0064] In the following examples and comparative examples, for the sources of some reagents or raw materials used, if the reagents or raw materials without indicating the manufacturer are all conventional products that can be obtained by purchasing in the market; among them,

[0065] Low-density polyethylene (LDPE-MG70), Qatar;

[0066] Ethylene-α-olefin copolymer (POE-8440), Dow Chemical Company, USA;

[0067] Glycidyl methacrylate (GMA), Jiangxi Ruixiang Chemical Co., Ltd.;

[0068] Styrene-acrylate glyceride (ADR-4368C), BASF;

[0069] Polyethylene glycol (PEG6000MO), Zhejiang Haian Petrochemical Factory;

[0070] Methyl methacrylate (MMA), Shandong Hongxu Chemical Co., Ltd.;

[0071] n-Butyl methacrylate (BMA), Huayi Hefeng Special Chemicals Zibo Co., Ltd.;

[0072] n-Butyl acrylate (BA), Jiangsu Sandie Chemical Co., Ltd.;

[0073] Ethyl acrylate (EA), Satellite Chemical Co., Ltd.;

[0074] Methacrylic acid, Qixiang Huali New Materials Co., Ltd.;

[0075] Acrylic acid, Jiangsu Sandie Chemical Co., Ltd.;

[0076] Sodium dodecyl sulfate (K12), Kao Corporation, Japan;

[0077] Sodium dodecylbenzenesulfonate, Kao Corporation, Japan;

[0078] Potassium persulfate, Hebei Jiheng Group Co., Ltd.;

[0079] Ammonium persulfate, Hebei Jiheng Group Co., Ltd.;

[0080] Polyethylene terephthalate (PET), China Resources Chemical Materials Technology Co., Ltd.;

[0081] Polyethylene terephthalate-1,4-cyclohexanedimethanol ester (PETG), China Resources Chemical Materials Technology Co., Ltd.;

[0082] Light calcium carbonate, 1250 mesh, Shandong Yuxin Nano Technology Co., Ltd.;

[0083] Heavy calcium carbonate, 800 mesh, Henan Yinyu Calcium Industry Co., Ltd.

[0084] Ethylene bisstearamide wax (EBS / EB-G), Kao Corporation of Japan;

[0085] Polyethylene wax (BN-108), Qingdao Bangni Chemical Co., Ltd.;

[0086] Ultra-fine talc powder, 8000 mesh, Qixia Huatai Talc Powder Co., Ltd.;

[0087] Calcium oxide, Xinxiang Yuanfeng Calcium Industry Co., Ltd.;

[0088] Blowing agent (grade MSA-2215), Kunshan Majisen Composite Materials Co., Ltd.

[0089] <Test Method>

[0090] 1. Density test: According to Article 4.2 of the national standard GB / T17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the density of the polyester cabinet panel samples to be tested is measured, and the result is accurate to 0.01 g / cm 3

[0091] 2. Static bending strength test: According to Article 4.7 of the national standard GB / T17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the static bending strength (three-point bending method) of the polyester cabinet panels to be tested is measured, and the result is accurate to 0.1 MPa.

[0092] 3. Screw holding power test: According to Article 4.21 of the national standard GB / T17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the screw holding power (abbreviation: screw holding power) of the polyester cabinet panels to be tested is measured, and the result is accurate to 10 N.

[0093] 4. Formaldehyde test: According to Clause 4.61 of GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Overlaid Wood-Based Panels", the formaldehyde release amount of the polyester cabinet boards to be tested is measured, and the result is accurate to 0.01 mg / L.

[0094] In the following preparation examples, examples and comparative examples, the amounts of raw materials are all in parts by weight.

[0095] I. Preparation of Reinforcing Agent

[0096] Reinforcing agent preparation example 1:

[0097] Weigh 200 parts of water, 70 parts of MMA, 25 parts of BA, 5.0 parts of methacrylic acid, 0.5 part of potassium persulfate, and 2.0 parts of sodium dodecylbenzenesulfonate and add them to a reactor for stirring and mixing. Polymerization reaction is carried out at a stirring speed of 100 revolutions per minute and the system temperature is raised to 50 °C to obtain a polymer emulsion, which is then dried to obtain polymer - 1;

[0098] Then, weigh 45 parts of LDPE, 3.0 parts of GMA, 5.0 parts of PEG, and 47 parts of the obtained polymer - 1, and add them to a high - speed mixer. The stirring frequency is 15 Hz, and they are mixed at room temperature for 5 minutes to obtain a reinforcing agent mixture;

[0099] Finally, the obtained reinforcing agent mixture is melt - extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the die heating zone temperature is set at 105 °C, and the confluence core set temperature is 105 °C to obtain reinforcing agent - 1.

[0100] Reinforcing agent preparation example 2:

[0101] Weigh 200 parts of water, 70 parts of MMA, 10 parts of BMA, 15.5 parts of BA, 4.5 parts of methacrylic acid, 0.4 part of potassium persulfate, and 1.8 parts of sodium dodecylbenzenesulfonate and add them to a reactor for stirring and mixing. Polymerization reaction is carried out at a stirring speed of 120 revolutions per minute and the system temperature is raised to 60 °C to obtain a polymer emulsion, which is then dried to obtain polymer - 2;

[0102] Then, weigh 47 parts of LDPE, 4.0 parts of GMA, 4.0 parts of PEG, and 45 parts of the obtained polymer - 2, and add them to a high - speed mixer. The stirring frequency is 20 Hz, and they are mixed at room temperature for 4 minutes to obtain a reinforcing agent mixture;

[0103] Finally, the obtained reinforcing agent mixture is melt - extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the die heating zone temperature is set at 105 °C, and the confluence core set temperature is 105 °C to obtain reinforcing agent - 2.

[0104] Enhancer Preparation Example 3:

[0105] Weigh out 150 parts of water, 71.5 parts of MMA, 25 parts of EA, 3.5 parts of acrylic acid, 0.2 part of potassium persulfate, and 2.0 parts of sodium dodecylbenzenesulfonate respectively and add them to the reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 120 revolutions per minute and the system is heated to 65 °C, a polymerization emulsion is obtained, and then dried to obtain a high molecular polymer - 3;

[0106] Then, weigh out 48 parts of LDPE, 1.0 part of GMA, 3.0 parts of PEG, and 48 parts of the prepared high molecular polymer - 3, and add them to a high - speed mixer. The stirring frequency is 20 Hz, and they are mixed at room temperature for 4 minutes to obtain an enhancer mixture;

[0107] Finally, the obtained enhancer mixture is melt - extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the die heating zone temperature is set at 105 °C, and the confluence core set temperature is 105 °C to obtain enhancer - 3.

[0108] Enhancer Preparation Example 4:

[0109] Weigh out 120 parts of water, 80 parts of MMA, 16 parts of BA, 4.0 parts of acrylic acid, 0.1 part of potassium persulfate, and 1.5 parts of sodium dodecyl sulfate respectively and add them to the reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 200 revolutions per minute and the system is heated to 70 °C, a polymerization emulsion is obtained, and then dried to obtain a high molecular polymer - 4;

[0110] Then, weigh out 40 parts of POE, 2.5 parts of ADR, 2.5 parts of PEG, and 55 parts of the prepared high molecular polymer - 4, and add them to a high - speed mixer. The stirring frequency is 30 Hz, and they are mixed at room temperature for 3 minutes to obtain an enhancer mixture;

[0111] Finally, the obtained enhancer mixture is melt - extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 105 °C, the die heating zone temperature is set at 115 °C, and the confluence core set temperature is 115 °C to obtain enhancer - 4.

[0112] Enhancer Preparation Example 5:

[0113] Weigh out 100 parts of water, 65 parts of MMA, 30 parts of BA, 5.0 parts of acrylic acid, 0.2 part of ammonium persulfate, and 1.8 parts of sodium dodecyl sulfate respectively and add them to the reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 150 revolutions per minute and the system is heated to 75 °C, a polymerization emulsion is obtained, and then dried to obtain a high molecular polymer - 5;

[0114] Then, weigh 50 parts of POE, 1.5 parts of GMA, 3.5 parts of PEG, and 45 parts of the prepared polymer - 5 respectively, and add them to a high - speed mixer. The stirring frequency is 50 Hz, and mix for 2 minutes at room temperature to obtain an enhancer mixture;

[0115] Finally, extrude and pelletize the obtained enhancer mixture through a screw extruder. Among them, the barrel temperature is set at 90 °C, the temperature of the die heating zone is set at 95 °C, and the temperature of the confluence core is set at 95 °C to obtain enhancer - 5.

[0116] Enhancer Preparation Example 6:

[0117] Weigh 100 parts of water, 70 parts of MMA, 27 parts of BA, 3.0 parts of methacrylic acid, 0.05 part of ammonium persulfate, and 1.8 parts of sodium dodecyl sulfate respectively and add them to a reactor for stirring and mixing. Carry out a polymerization reaction at a stirring speed of 300 revolutions per minute and raise the temperature of the system to 80 °C to obtain a polymerization emulsion, and then dry it to obtain polymer - 6;

[0118] Then, weigh 46 parts of POE, 5.0 parts of GMA, 5.0 parts of PEG, and 44 parts of the prepared polymer - 6 respectively, and add them to a high - speed mixer. The stirring frequency is 45 Hz, and mix for 2.5 minutes at room temperature to obtain an enhancer mixture;

[0119] Finally, extrude and pelletize the obtained enhancer mixture through a screw extruder. Among them, the barrel temperature is set at 110 °C, the temperature of the die heating zone is set at 115 °C, and the temperature of the confluence core is set at 115 °C to obtain enhancer - 6.

[0120] Enhancer Preparation Example 7:

[0121] Weigh 100 parts of water, 90 parts of BMA, 5.0 parts of EA, 5.0 parts of methacrylic acid, 0.01 part of ammonium persulfate, and 0.6 parts of sodium dodecyl sulfate respectively and add them to a reactor for stirring and mixing. Carry out a polymerization reaction at a stirring speed of 60 revolutions per minute and raise the temperature of the system to 80 °C to obtain a polymerization emulsion, and then dry it to obtain polymer - 7;

[0122] Then, weigh 45 parts of LDPE, 0.5 parts of ADR, 0.5 parts of PEG, and 54 parts of the prepared polymer - 7 respectively, and add them to a high - speed mixer. The stirring frequency is 30 Hz, and mix for 3 minutes at room temperature to obtain an enhancer mixture;

[0123] Finally, extrude and pelletize the obtained enhancer mixture through a screw extruder. Among them, the barrel temperature is set at 110 °C, the temperature of the die heating zone is set at 115 °C, and the temperature of the confluence core is set at 115 °C to obtain enhancer - 7.

[0124] Reinforcement Comparative Example 1:

[0125] Weigh 200 parts of water, 34.2 parts of MMA, 65 parts of BA, 0.8 part of methacrylic acid, 0.5 part of potassium persulfate, and 2.0 parts of sodium dodecylbenzenesulfonate respectively and add them to a reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 100 revolutions per minute and the system is heated to 50 °C, a polymerization emulsion is obtained, and then dried to obtain a high molecular polymer - 1';

[0126] Then, weigh 45 parts of LDPE, 3.0 parts of GMA, 5.0 parts of PEG, and 47 parts of the prepared high molecular polymer - 1' respectively, and add them to a high-speed mixer. The stirring frequency is 15 Hz, and they are mixed at room temperature for 5 minutes to obtain a reinforcement mixture;

[0127] Finally, the obtained reinforcement mixture is melt-extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the die heating zone temperature is set at 105 °C, and the confluence core set temperature is 105 °C to obtain reinforcement - 1'.

[0128] Reinforcement Comparative Example 2:

[0129] Weigh 200 parts of water, 70 parts of MMA, 30 parts of BA, 0.5 part of potassium persulfate, and 2.0 parts of sodium dodecylbenzenesulfonate respectively and add them to a reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 100 revolutions per minute and the system is heated to 50 °C, a polymerization emulsion is obtained, and then dried to obtain a high molecular polymer - 2';

[0130] Then, weigh 45 parts of LDPE, 3.0 parts of GMA, 5.0 parts of PEG, and 47 parts of the prepared high molecular polymer 2' respectively, and add them to a high-speed mixer. The stirring frequency is 15 Hz, and they are mixed at room temperature for 5 minutes to obtain a reinforcement mixture;

[0131] Finally, the obtained reinforcement mixture is melt-extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the die heating zone temperature is set at 105 °C, and the confluence core set temperature is 105 °C to obtain reinforcement - 2'.

[0132] Reinforcement Comparative Example 3:

[0133] Weigh 200 parts of water, 70 parts of MMA, 30 parts of BA, 0.5 part of potassium persulfate, and 2.0 parts of sodium dodecylbenzenesulfonate respectively and add them to a reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 100 revolutions per minute and the system is heated to 50 °C, a polymerization emulsion is obtained, and then dried to obtain a high molecular polymer - 3';

[0134] Then, weigh 45 parts of LDPE, 3.0 parts of GMA, and 52 parts of the prepared polymer 3' respectively, and add them to a high-speed mixer. The stirring frequency is 15 Hz, and they are mixed for 5 minutes at room temperature to obtain a reinforcing agent mixture;

[0135] Finally, the obtained reinforcing agent mixture is melt-extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the temperature of the die heating zone is set at 105 °C, and the temperature of the confluence core is set at 105 °C to obtain reinforcing agent - 3'.

[0136] Reinforcing agent Comparative Example 4:

[0137] Weigh 200 parts of water, 70 parts of MMA, 30 parts of BA, 0.5 part of potassium persulfate, and 2.0 parts of sodium dodecylbenzenesulfonate respectively and add them to a reactor for stirring and mixing. After the polymerization reaction is carried out at a stirring speed of 100 revolutions per minute and the system is heated to 50 °C, a polymerization emulsion is obtained, and then it is dried to obtain polymer - 4';

[0138] Then, weigh 48 parts of LDPE and 52 parts of the prepared polymer 4' respectively, and add them to a high-speed mixer. The stirring frequency is 15 Hz, and they are mixed for 5 minutes at room temperature to obtain a reinforcing agent mixture;

[0139] Finally, the obtained reinforcing agent mixture is melt-extruded and pelletized through a screw extruder. Among them, the barrel temperature is set at 100 °C, the temperature of the die heating zone is set at 105 °C, and the temperature of the confluence core is set at 105 °C to obtain reinforcing agent - 4'.

[0140] In the preparation examples and comparative examples of the reinforcing agent, the main raw material formula of the polymer is shown in Table 1, and the main raw material formula of the reinforcing agent is shown in Table 2.

[0141] Table 1 Main raw material formula of the polymer in the preparation examples and comparative examples of the reinforcing agent

[0142] Alkyl Methacrylate Alkyl Acrylate Carboxylic Acid Polymer - 1 70 parts of MMA 25 parts of BA 5.0 parts of Methacrylic Acid Polymer - 2 70 parts of MMA, 10 parts of BMA 15.5 parts of BA 4.5 parts of Methacrylic Acid Polymer - 3 71.5 parts of MMA 25 parts of EA 3.5 parts of Acrylic Acid Polymer - 4 80 parts of MMA 16 parts of BA 4.0 parts of Acrylic Acid Polymer - 5 65 parts of MMA 30 parts of BA 5.0 parts of Acrylic Acid Polymer - 6 70 parts of MMA 27 parts of BA 3.0 parts of Methacrylic Acid Polymer - 7 90 parts of BMA 5.0 parts of EA 5.0 parts of Methacrylic Acid Polymer - 1’ 34.2 parts of MMA 65 parts of BA 0.8 parts of Methacrylic Acid Polymer - 2’ 70 parts of MMA 30 parts of BA 0 Polymer - 3’ 70 parts of MMA 30 parts of BA 0 Polymer - 4’ 70 parts of MMA 30 parts of BA 0

[0143] Table 2 Main raw material formula of the preparation examples and comparative examples of the reinforcing agent

[0144] Carrier Resin Chain Extender Dispersant Polymer Reinforcing Agent - 1 45 parts of LDPE 3.0 parts of GMA 5.0 parts of PEG 47 parts of Polymer - 1 Reinforcing Agent - 2 47 parts of LDPE 4.0 parts of GMA 4.0 parts of PEG 45 parts of Polymer - 2 Reinforcing Agent - 3 48 parts of LDPE 1.0 parts of GMA 3.0 parts of PEG 48 parts of Polymer - 3 Reinforcing Agent - 4 40 parts of POE 2.5 parts of ADR 2.5 parts of PEG 55 parts of Polymer - 4 Reinforcing Agent - 5 50 parts of POE 1.5 parts of GMA 3.5 parts of PEG 45 parts of Polymer - 5 Reinforcing Agent - 6 46 parts of POE 5.0 parts of GMA 5.0 parts of PEG 44 parts of Polymer - 6 Reinforcing Agent - 7 45 parts of LDPE 0.5 parts of ADR 0.5 parts of PEG 54 parts of Polymer - 7 Reinforcing Agent - 1’ 45 parts of LDPE 3.0 parts of GMA 5.0 parts of PEG 47 parts of Polymer - 1’ Reinforcing Agent - 2’ 45 parts of LDPE 3.0 parts of GMA 5.0 parts of PEG 47 parts of Polymer - 2’ Reinforcing Agent - 3’ 45 parts of LDPE 3.0 parts of GMA 0 52 parts of Polymer - 3’ Reinforcing Agent - 4’ 48 parts of LDPE 0 0 52 parts of Polymer - 4’

[0145] II. Preparation of Polyester Cabinet Boards

[0146] 1. Preparation process of the polyester cabinet board:

[0147] Using the obtained Reinforcer-1 to Reinforcer-7 as raw materials respectively, the numbers corresponding to the preparation examples of each polyester cabinet board are Examples 1 to 7; using Reinforcer-1' to Reinforcer-4' as raw materials respectively, the numbers corresponding to the comparative examples of polyester cabinet board preparation are Comparative Examples 1 to 4.

[0148] (1) In Examples 1 to 7 and Comparative Examples 1 to 4, the formula of the polyester cabinet board is shown in Table 3. Weigh and measure each component according to the formula in Table 3, and add them to a high-speed mixer, and stir at normal temperature for 5 minutes at 30 Hz to obtain a polyester mixture;

[0149] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 260 °C, the temperature of the mold heating zone is set at 260 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 25 °C to obtain a board;

[0150] Table 3 Formula of Polyester Cabinet Board

[0151]

[0152]

[0153] The performance test results of the cabinet boards prepared in Examples 1 to 7 and Comparative Examples 1 to 4 are shown in Table 4.

[0154] Table 4 Performance Test Results of Cabinet Boards

[0155]

[0156]

[0157] According to the results in Table 4, it can be seen that the density of the boards obtained in Examples 1 to 7 is all between 0.35 and 0.80 g / cm 3 , and the static bending strength of the obtained polyester cabinet board is above 12.0 MPa and the nail-holding force is above 800 N; the density of the boards obtained in Comparative Examples 1 to 4 is relatively high, all above 0.80 g / cm 3 above, and the static bending strength and nail-holding force of the obtained polyester cabinet board are relatively low; this is because the reinforcing agents used in Comparative Examples 1 to 4 cannot make the polyester material tacky and cannot improve its melt strength, resulting in the melt being unable to wrap the gas released by the foaming agent, resulting in the obtained polyester cabinet board having a high density, low strength, and low nail-holding force.

[0158] 2. Preparation process of polyester cabinet board:

[0159] (1) In Examples 8 to 10 and Comparative Examples 5 to 9, the sheet formulation of the polyester sheet for cabinets is shown in Table 5. Weigh and measure each component according to the formulation in Table 5, and add them to a high-speed mixer. Stir at room temperature for 5 minutes at 30 Hz to obtain a polyester mixture;

[0160] (2) Melt-extrude and skin-foam the obtained polyester mixture through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 260 °C, the temperature of the die heating zone is set at 260 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0161] Table 5 Formulation of the sheet in the polyester sheet for cabinets

[0162]

[0163]

[0164] The performance test results of the cabinet sheets prepared in Examples 8 to 10 and Comparative Examples 5 to 9 are shown in Table 6.

[0165] Table 6 Performance test results of the polyester sheet for cabinets

[0166]

[0167] It can be seen from the results in Table 6 that in Examples 8 to 10, the same reinforcing agent prepared in the same example is selected and different amounts are added, and the densities of the polyester sheets for cabinets prepared are all in the range of 0.35 to 0.80 g / cm 3 ; as the amount of the reinforcing agent increases, the flexural strength and nail-holding force of the polyester sheet for cabinets gradually increase; in Comparative Examples 5 to 7, the same reinforcing agent prepared in the same comparative example is selected and different amounts are added, and the densities of the polyester sheets for cabinets prepared are all above 0.80 g / cm 3 ; even if the amount of the reinforcing agent added is increased, the flexural strength and nail-holding force of the obtained polyester sheet for cabinets are relatively low; in Comparative Examples 8 and 9, the reinforcing agent obtained in the preparation example is selected, but the amount added is not between 12.0 and 20.0, and the density, flexural strength and nail-holding force of the prepared polyester sheet are all relatively low.

[0168] 3. Preparation process of the polyester sheet for cabinets:

[0169] Example 11

[0170] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer, then add 3.5 parts of MSA-2215, 15.0 parts of reinforcing agent-1, 40.0 parts of heavy calcium carbonate, 4.3 parts of EBS, 0.50 part of fumed silica, and 5.0 parts of magnesium oxide, and stir at room temperature for 5 minutes at 30 Hz to obtain a polyester mixture;

[0171] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 257 °C, the temperature of the die heating zone is set at 257 °C, the temperature of the confluence core is set at 255 °C, and the temperature of the sizing plate is 23 °C to obtain a sheet.

[0172] Example 12

[0173] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 3.8 parts of MSA-2215, 17.5 parts of Reinforcer-1, 70.0 parts of heavy calcium carbonate, 4.6 parts of PE wax, 0.75 part of fumed silica, and 4.8 parts of calcium oxide, and stir and mix at 30 Hz at room temperature for 5 min to obtain a polyester mixture;

[0174] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 255 °C, the temperature of the die heating zone is set at 255 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 23 °C to obtain a sheet.

[0175] Example 13

[0176] (1) Weigh 100.0 parts of PETG and add it to a high-speed mixer. Then add 4.0 parts of MSA-2215, 18.5 parts of Reinforcer-1, 100.0 parts of heavy calcium carbonate, 5.0 parts of PE wax, 1.0 part of graphene, and 5.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0177] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 240 °C, the temperature of the die heating zone is set at 240 °C, the temperature of the confluence core is set at 235 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet;

[0178] The formulations for preparing polyester cabinet sheets in Examples 11 to 13 are shown in Table 7.

[0179] Table 7 Formulations of Sheets in Polyester Cabinet Sheets

[0180]

[0181] The performance test results of the cabinet sheets prepared in Examples 11 to 13 are shown in Table 8.

[0182] Table 8 Performance Test Results of Polyester Cabinet Sheets

[0183]

[0184] From the results of Examples 11 to 13, it can be seen that as the amount of the inorganic filler increases significantly, the density of the obtained polyester sheet for cabinet shows an increasing trend, but all are in the range of 0.35 - 0.80 g / cm 3 , and the flexural strength and nail-holding force performance show a downward trend. However, the flexural strength is still above 12.0 MPa, and the nail-holding force is above 800 N, meeting the performance requirements.

[0185] 4. Preparation process of the polyester sheet for cabinet:

[0186] Example 14

[0187] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 3.3 parts of MSA-2215, 15.5 parts of Reinforcer-2, 30.0 parts of heavy calcium carbonate, 4.2 parts of EBS, 0.5 part of graphene, and 4.5 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0188] (2) Melt-extrude and skin-foam the obtained polyester mixture through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 260 °C, the temperature of the die heating zone is set at 260 °C, the temperature of the confluence core is set at 255 °C, and the temperature of the sizing plate is 24 °C to obtain a sheet.

[0189] Example 15

[0190] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 3.3 parts of MSA-2215, 15.5 parts of Reinforcer-2, 30.0 parts of heavy calcium carbonate, 4.2 parts of EBS, 0.6 part of silica aerogel, and 4.8 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0191] (2) Melt-extrude and skin-foam the obtained polyester mixture through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 250 °C, the temperature of the die heating zone is set at 250 °C, the temperature of the confluence core is set at 255 °C, and the temperature of the sizing plate is 24 °C to obtain a sheet.

[0192] Example 16

[0193] (1) Weigh 100.0 parts of PETG and add it to a high-speed mixer. Then add 3.6 parts of MSA-2215, 16.0 parts of Reinforcer-2, 65.0 parts of light calcium carbonate, 4.6 parts of PE wax, 0.8 part of graphene, and 5.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0194] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 255 °C, the temperature of the die heating zone is set at 255 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 24 °C to obtain a sheet.

[0195] Example 17

[0196] (1) Weigh 100.0 parts of rPET and add it to a high-speed mixer. Then add 3.9 parts of MSA-2215, 18.0 parts of Reinforcing Agent-2, 55.0 parts of light calcium carbonate, 5.0 parts of PE wax, 0.75 part of fumed silica, and 4.3 parts of calcium oxide, and stir and mix at 30 Hz for 5 minutes to obtain a polyester mixture;

[0197] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 245 °C, the temperature of the die heating zone is set at 245 °C, the temperature of the confluence core is set at 240 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0198] Comparative Example 10

[0199] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 3.8 parts of MSA-2215, 18.0 parts of Reinforcing Agent-2, 40.0 parts of light calcium carbonate, 5.0 parts of PE wax, and 4.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 minutes to obtain a polyester mixture;

[0200] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 275 °C, the temperature of the die heating zone is set at 275 °C, the temperature of the confluence core is set at 265 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0201] Comparative Example 11

[0202] (1) Weigh 100.0 parts of rPET and add it to a high-speed mixer. Then add 3.8 parts of MSA-2215, 20.0 parts of Reinforcing Agent-2, 50.0 parts of light calcium carbonate, 5.0 parts of EBS, 1.5 parts of fumed silica, and 5.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 minutes to obtain a polyester mixture;

[0203] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 272 °C, the temperature of the die heating zone is set at 272 °C, the temperature of the confluence core is set at 262 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0204] The main variables of Examples 14 to 17 and the main variables of Comparative Examples 10 to 11 are nucleating agents, and the specific formulations are shown in Table 9.

[0205] Table 9 Formulation of the sheet for polyester cabinets

[0206]

[0207]

[0208] The performance test results of the cabinet sheets prepared in Examples 14 to 17 and Comparative Examples 10 to 11 are shown in Table 10.

[0209] Table 10 Performance test results of the sheet for polyester cabinets

[0210]

[0211] From the performance results of the cabinet sheets prepared in Examples 14 to 17 and Comparative Examples 10 to 11, it can be seen that after adding graphene, fumed silica, silica aerogel, etc. as nucleating agents, the static bending strength and nail-holding force of the obtained cabinet sheets are excellent; in the formulations of Comparative Examples 10 to 11, no nucleating agent is added or the added nucleating agent is not within the appropriate range, and the cabinet sheets prepared therefrom require a higher processing temperature, and the sheet density is on the high side, and the static bending strength and nail-holding force are poor.

[0212] 5. Preparation process of the sheet for polyester cabinets:

[0213] Example 18

[0214] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer, then add 4.5 parts of MSA-2215, 16.4 parts of Reinforcer-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 part of graphene, and 4.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0215] (2) Melt-extrude and skin-foam the obtained polyester mixture through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 255 °C, the temperature of the die heating zone is set at 255 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 25 °C to obtain the sheet.

[0216] Example 19

[0217] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer, then add 4.5 parts of MSA-2215, 16.4 parts of Reinforcer-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 part of graphene, and 3.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0218] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 255 °C, the temperature of the die heating zone is set at 255 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0219] Example 20

[0220] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 4.5 parts of MSA-2215, 16.4 parts of Reinforcing Agent-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 parts of graphene, and 5.0 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0221] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 260 °C, the temperature of the die heating zone is set at 260 °C, the temperature of the confluence core is set at 255 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0222] Comparative Example 12

[0223] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 4.5 parts of MSA-2215, 16.4 parts of Reinforcing Agent-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 parts of graphene, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0224] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 255 °C, the temperature of the die heating zone is set at 255 °C, the temperature of the confluence core is set at 250 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0225] Comparative Example 13

[0226] (1) Weigh 100.0 parts of PET and add it to a high-speed mixer. Then add 4.5 parts of MSA-2215, 16.4 parts of Reinforcing Agent-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 parts of graphene, and 0.5 parts of calcium oxide, and stir and mix at 30 Hz for 5 min to obtain a polyester mixture;

[0227] (2) The obtained polyester mixture is melt-extruded and skin-foamed through a screw extruder. Among them, the barrel temperature of the screw extruder is set at 258 °C, the temperature of the die heating zone is set at 258 °C, the temperature of the confluence core is set at 252 °C, and the temperature of the sizing plate is 25 °C to obtain a sheet.

[0228] The main variables of Examples 18 to 20 and the main variables of Comparative Examples 12 to 13 are water absorbents, and the specific formulations are shown in Table 11.

[0229] Table 11 Formulation of the board for cabinet

[0230]

[0231] The performance test results of the boards for cabinets prepared in Examples 18 to 20 and Comparative Examples 12 to 13 are shown in Table 12.

[0232] Table 12 Performance test results of the boards for cabinets

[0233]

[0234] From the performance results of the boards for cabinets prepared in Examples 18 to 20 and Comparative Examples 12 to 13, it can be seen that after adding a water absorbent to the formulation, the hydrolysis of polyester can be effectively inhibited, and the density, static bending strength and nail-holding force of the obtained boards for cabinets are excellent; in the formulations of Comparative Examples 12 to 13, no water absorbent is added or the added water absorbent is not in the appropriate range, and the density, static bending strength and nail-holding force of the prepared boards for cabinets are poor.

[0235] The board for cabinet of the present invention has a simple preparation process, low energy consumption and low cost. At the same time, the obtained board has a low density, high static bending strength and high nail-holding force, is green and environmentally friendly, and can be recycled.

[0236] The various embodiments of the present invention have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field of the present invention without departing from the gist of the present invention.

Claims

1. A reinforcing agent for polyester, characterized in that: Taking the total weight of each component in the reinforcing agent as 100 parts, the reinforcing agent includes the following components: Carrier resin, 40-50 parts; Chain extender, 0.5~5 parts; Dispersant, 0.5~5 parts; High molecular weight polymer, 44-55 parts; The carrier resin is selected from at least one of polyethylene, chlorinated polyethylene, ethylene-butyl acrylate copolymer, ethylene-α-olefin copolymer grafted with maleic anhydride and ethylene-α-olefin copolymer; The chain extender is selected from at least one of triglycidyl isocyanurate, glycidyl methacrylate and other glycidyl acrylates; The dispersant is selected from polyethylene glycol and / or polypropylene glycol; The high molecular weight polymer is made of raw materials including the following components by weight: 100 parts of the monomer composition, 0.4~4.0 parts of emulsifier, 0.01~1.0 parts of initiator, 100~200 parts of water; Wherein, based on the sum of the weight parts of each monomer, the monomer composition includes the following monomers: 60-95 parts of alkyl methacrylate, 4-30 parts of alkyl acrylate, 1.0-5.0 parts of carboxylic acid.

2. The enhancer according to claim 1, characterized in that The alkyl methacrylate is selected from at least one of methyl methacrylate, n-butyl methacrylate and isobutyl methacrylate; The alkyl acrylate is selected from at least one of n-butyl acrylate, ethyl acrylate, methyl acrylate, isobutyl acrylate and isooctyl acrylate; The carboxylic acid is selected from at least one of methacrylic acid, acrylic acid, maleic acid, itaconic acid and fumaric acid; The emulsifier is selected from at least one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, potassium dodecyl sulfate, sodium stearate and potassium stearate; The initiator is selected from at least one of potassium persulfate, sodium persulfate and ammonium persulfate.

3. The method for preparing the enhancer according to claim 1 or 2, characterized in that: The preparation method comprises the following steps: (1) Preparing a high molecular polymer: Weighing alkyl methacrylate, alkyl acrylate, carboxylic acid, emulsifier, initiator and water as monomers respectively, stirring and mixing them evenly, obtaining a polymer emulsion after polymerization reaction, and then drying to obtain the high molecular polymer; (2) Weighing a carrier resin, a chain extender, a dispersant and the high molecular weight polymer prepared in step (1) respectively, and mixing them to obtain a reinforcing agent mixture; (3) The reinforcing agent mixture obtained in step (2) is melt-extruded and granulated by a screw extruder to obtain the reinforcing agent.

4. The preparation method according to claim 3, characterized in that: The process conditions of the polymerization reaction for preparing the high molecular weight polymer in step (1) include: The stirring speed was set at 60-500 rpm and the reaction temperature was set at 50-80°C.

5. The preparation method according to claim 3, characterized in that: The process conditions of the melt extrusion granulation in step (3) include: The barrel temperature of the screw extruder was set at 90~110°C, the temperature of the mold heating zone was set at 95~115°C, and the confluence core temperature was set at 95~115°C.

6. A formaldehyde-free, high-nail-holding polyester cabinet board, characterized in that: The polyester cabinet board comprises the following components in parts by weight: (a) 100.0 parts of polyester, (b) 2.0 to 5.0 parts of a foaming agent, (c) 12.0 to 20.0 parts of a reinforcing agent, (d) 20.0 to 100.0 parts of an inorganic filler, (e) 4.0 to 6.0 parts of lubricant, (f) 0.2~1.0 parts of nucleating agent, (g) 1.0 to 5.0 parts of a water absorbent; Wherein, the enhancer is the enhancer according to any one of claims 1-2 or the enhancer prepared by the preparation method according to any one of claims 3-5.

7. The polyester cabinet board according to claim 6, characterized in that: The density of the polyester cabinet board is 0.35-0.80 g / cm 3 .

8. The polyester cabinet board according to claim 6, characterized in that: The polyester is selected from at least one of polyethylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol and polybutylene terephthalate; The inorganic filler is selected from at least one of light calcium carbonate, heavy calcium carbonate and talc; The lubricant is selected from at least one of polyethylene wax, polypropylene wax, oxidized polyethylene wax, glyceryl stearate, pentaerythritol stearate, ethylene bis stearamide wax, erucamide wax, stearic acid, calcium stearate and silicone oil; The nucleating agent is selected from at least one of ultrafine talc, nano calcium carbonate, fumed silica, silica aerogel and graphene; The water absorbing agent is selected from calcium oxide and / or magnesium oxide.

9. The method for preparing the polyester cabinet board according to any one of claims 6 to 8, characterized in that: The steps include: (1) Weighing polyester, foaming agent, reinforcing agent, inorganic filler, lubricant, nucleating agent and water absorbent respectively, and mixing them to prepare a polyester mixture; (2) The polyester mixture obtained in step (1) is melt-extruded and foamed using a screw extruder to obtain the polyester cabinet board.

10. The preparation method according to claim 9, characterized in that: The process conditions of melt extrusion and skinning foaming in step (2) include: The barrel temperature of the screw extruder is set to 190~260℃, the temperature of the mold heating zone is set to 200~260℃, the confluence core temperature is set to 200~255℃, and the setting plate temperature is set to 10~35℃.

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