Reinforcing agent for polyester, preparation method of reinforcing agent, plate for polyester cabinet and preparation method of plate

Abstract

The invention belongs to the technical field of preparation of plates for polyester cabinets, and particularly relates to a reinforcing agent for polyester, a preparation method of the reinforcing agent, a plate for polyester cabinets and a preparation method of the plate. The board for the polyester cabinet comprises 100 parts of polyester, 2-5 parts of a foaming agent, 12-20 parts of a reinforcing agent, 20-100 parts of an inorganic filler, 4-6 parts of a lubricant, 0.2-1 part of a nucleating agent and 1-5 parts of a water absorbent, the reinforcing agent comprises 40-50 parts of carrier resin, 0.5-5 parts of a chain extender, 0.5-5 parts of a dispersing agent and 45-55 parts of a high-molecular polymer. The board for the polyester cabinet does not need to be bonded by an adhesive, and the raw materials do not release formaldehyde; the plate prepared by adding the reinforcing agent has high static bending intensity and nail-holding power; meanwhile, the forming period can be shortened, and the processability of the polyester is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of polyester cabinet board, and in particular relates to a polyester reinforcing agent and a preparation method thereof, a polyester cabinet board and a preparation method thereof. Background Art

[0002] At present, the main types of boards used in cabinets are density boards and particle boards. The full name of density board is density fiberboard, which is made of wood fiber or other plant fiber as raw materials, and is made by applying synthetic resin to the fiber and pressing it under heating and pressure. Particle board is also called particle board, which is made by cutting various branches, small-diameter wood, fast-growing wood, sawdust and other natural wood into pieces of certain specifications, drying them, mixing them with glue, hardener, waterproofing agent, etc., and pressing them under certain temperature and pressure to make a kind of artificial board.

[0003] Adhesives are needed in the preparation process of density boards and particle boards. The main components of adhesives are phenolic resin glue or urea-formaldehyde resin glue. Both of them will continuously release formaldehyde for a long time, affecting human health, especially children, pregnant women and the elderly.

[0004] As people's environmental awareness increases, some improvement plans use wood-plastic one-time material technology to replace cabinet boards containing formaldehyde. For example, polyvinyl chloride and wood powder are extruded to produce cabinet boards, which are moisture-proof, waterproof, and insect-proof. However, the cabinet boards produced by this method have low static bending strength, poor nail holding force, 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 complicated and the improvement results are unsatisfactory.

[0005] In view of this, how to solve the formaldehyde release problem of cabinet boards, how to improve the static bending strength and nail holding force of cabinet boards, reduce the weight of boards, increase the service life and simplify the preparation process have become directions worthy of research. Summary of the invention

[0006] The purpose of the present invention is to provide a formaldehyde-free, high-nail-holding-force polyester cabinet board in view of the problem of long-term continuous formaldehyde release in cabinet boards in the prior art and the low static bending strength, poor nail holding force, high density, and short service life of boards obtained by one-time extrusion or multi-layer composite technology. The obtained board does not need to be bonded with an adhesive and the raw materials used will not release formaldehyde. The board material prepared by adding a reinforcing agent has high static bending strength and high nail holding force. At the same time, it can also shorten the molding cycle and improve the processability of polyester.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, a reinforcing agent for polyester is provided, wherein the total weight of each component in the reinforcing agent is 100 parts, and 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 weight 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 with 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 acrylates.

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

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

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

[0018] 0.4 to 4.0 parts (e.g., 0.5, 1, 1.5, 2, 2.5, 3, 3.5) of an emulsifier,

[0019] 0.01 to 1.0 parts (e.g., 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 an initiator,

[0020] 100-200 parts (e.g., 120 parts, 150 parts, 180 parts) of water;

[0021] Wherein, based on the sum of the weight parts of each monomer as a reference (such as 100), the monomer composition includes the following monomers:

[0022] 60-95 parts (e.g., 62 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts) of alkyl methacrylate, 4-30 parts (e.g., 5 parts, 6 parts, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 28 parts) of alkyl acrylate, 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 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 acrylate is 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 dodecylbenzene sulfonate, 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, a method for preparing the enhancer as described above is provided, the method comprising the following steps:

[0029] (1) Preparing a high molecular polymer: Weighing monomers such as alkyl methacrylate, alkyl acrylate, carboxylic acid, emulsifier, initiator and water respectively, stirring and mixing them uniformly, obtaining a polymer emulsion after polymerization reaction, and then drying to obtain the high molecular polymer;

[0030] (2) Weighing the carrier resin, the chain extender, the dispersant and the high molecular weight polymer obtained in step (1) respectively, and mixing them (for example, adding them to a high-speed mixer and mixing them at room temperature) to obtain a reinforcing agent mixture;

[0031] (3) The reinforcing agent mixture obtained in step (2) is melt-extruded and granulated by a screw extruder to obtain the reinforcing agent.

[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 rpm (e.g., 70 rpm, 80 rpm, 100 rpm, 200 rpm, 300 rpm, 400 rpm), 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 mixing equipment can be conventional operations in the art; for example, the raw materials can be added to a high-speed mixer and mixed 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 mold heating zone temperature is set to 95-115°C (e.g., 100°C, 105°C, 110°C), and the confluence core temperature is set to 95-115°C (e.g., 100°C, 105°C, 110°C).

[0036] In a third aspect, a formaldehyde-free polyester cabinet board with high nail holding force is provided, wherein the polyester cabinet board comprises the following components in parts by weight:

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

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

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

[0040] (d) 20.0 to 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 to 6.0 parts (e.g., 4.5 parts, 5 parts, 5.5 parts) of a lubricant,

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

[0043] (g) 1.0 to 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] Wherein, the enhancer is the enhancer as described above or the enhancer prepared by the preparation method as described above.

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

[0046] According to the polyester cabinet board provided by the present invention, in some embodiments, the polyester is selected from at least one of polyethylene terephthalate, polyethylene terephthalate-1,4-cyclohexanedimethanol 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 blowing agent may be an endothermic blowing agent, for example, the blowing agent MSA-2215.

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

[0049] In some embodiments, 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.

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

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

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

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

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

[0055] According to the method for preparing the polyester cabinet board 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 uniformly at room temperature.

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

[0057] The barrel temperature of the screw extruder is set to 190-260°C (e.g., 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 (e.g., 205°C, 210°C, 220°C, 240°C, 250°C, 255°C), the confluence core temperature is set to 200-255°C (e.g., 205°C, 210°C, 220°C, 230°C, 240°C, 245°C, 250°C), and the temperature of the shaping plate is 10-35°C (e.g., 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 are mainly:

[0059] The present invention can make a thermoplastic polyester plastic mixture into cabinet boards through screw melt extrusion, without the need for bonding with adhesives, and the raw materials used will not release formaldehyde, which fundamentally solves the problem of formaldehyde release and reduces the harm caused by formaldehyde to humans; in addition, the polyester in the raw materials can use recycled materials, and the prepared cabinet boards can be recycled and reused, which extends the life cycle of the materials and reduces carbon emissions, and is a green and environmentally friendly material.

[0060] The polyester material in the board formula has a distinct melting point range. During the screw extrusion process, after the polyester reaches the melting point, its melt viscosity becomes smaller and the melt strength is also small. This will result in the polyester material being unable to encapsulate the gas released by the foaming agent in the mixture after foaming, making the static bending strength of the cabinet board material low and the nail holding force poor. In addition, due to the low melt strength of the system, inorganic fillers cannot be added to the formula, resulting in high costs. The invention adds a reinforcing agent into the board formula, wherein the main component is a high molecular polymer, and the high molecular polymer with a long chain structure is synthesized by emulsion polymerization using monomers such as methyl methacrylate and n-butyl acrylate as comonomers, and functional monomers (such as methacrylic acid, maleic acid, itaconic acid, fumaric acid and other carboxylic acids) are added during the emulsion polymerization to introduce active carboxyl groups, and epoxy substances are added as chain extenders to react with the introduced carboxyl groups and the terminal carboxyl groups and terminal hydroxyl groups of the polyester to form a reinforcing system with a network structure, thereby effectively improving the entanglement of molecular chains in the polyester melt, and further improving the melt strength of the polyester; in the reinforcing agent formula, PE, POE and other elastomer polymers are used as carrier resins, which have the following advantages: first, the processing temperature is low, which is all below the decomposition temperature of the foaming agent; second, the melt viscosity is large and the processing and molding are easy, and the compatibility with the acrylic ester high molecular polymer is good; PEG and the like are added as dispersants in the reinforcing agent formula, which can effectively encapsulate the gas released by the foaming agent in the polyester mixture and improve the solubility of the gas in the polyester material. Therefore, the board prepared by adding the reinforcing agent has high static bending 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 board, which greatly saves costs.

[0061] Polyester material is a kind of semi-crystalline polymer with slow crystallization rate, and a nucleating agent needs to be added during the processing. Fine-particle inorganic substances are added to the board formula of the present invention as nucleating agents, and the crystallization rate of polyester is shortened by combining the processing method of blending, shortening the molding cycle, and improving the processability of polyester. Polyester materials are easy to hydrolyze. If the polyester or polyester mixture contains a small amount of water, the material will cause polyester hydrolysis during the screw extrusion process, resulting in molecular chain breakage, which will cause the material strength to decrease and the processing performance to deteriorate. Therefore, the usual means need to add a high-temperature drying step before the screw extrusion process to remove the moisture in the raw material; the present invention adds a water absorbent to the board formula, which can react with the moisture in the polyester or polyester mixture to generate an alkaline substance, and the alkaline substance will not affect the processability of the polyester or polyester mixture, and there is no need for high-temperature drying and dehydration before extrusion processing, which simplifies the production process, reduces energy consumption, and saves costs. In addition, the cabinet board provided by the present invention is obtained by melt extrusion and skinning foaming of a screw extruder, which further simplifies the production process, reduces energy consumption, and saves costs.

[0062] The cabinet board of the present invention has a simple preparation process, low energy consumption, low cost, high static bending strength and nail holding force, and is green and environmentally friendly. The formaldehyde emission is tested in accordance with Clause 4.61 of GB / T17657-2022 "Test Methods for Physical and Chemical Properties of Artificial Boards and Veneered Artificial Boards", and the result is no detection. DETAILED DESCRIPTION

[0063] In order to understand the technical features and content of the present invention in detail, the preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described in the embodiments, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. For those who do not specify specific conditions in the embodiments, they are carried out according to normal conditions or the conditions recommended by the manufacturer.

[0064] In the following examples and comparative examples, the sources of some reagents or raw materials used, if the manufacturer of the reagents or raw materials is not indicated, are conventional products that can be purchased commercially; wherein,

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

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

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

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

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

[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, Japan;

[0077] Sodium dodecylbenzene sulfonate, 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 (PETG), China Resources Chemical Materials Technology Co., Ltd.;

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

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

[0084] Ethylene bis stearamide wax (EBS / EB-G), Kao, Japan;

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

[0086] Ultrafine talcum powder, 8000 mesh, Qixia Huatai Talc Powder Co., Ltd.;

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

[0088] Foaming agent (brand name: MSA-2215), Kunshan Meijisen Composite Materials Co., Ltd.

[0089] <Test Method>

[0090] 1. Density test: According to the national standard GB / T17657-2022 "Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels" 4.2, the density of the polyester cabinet board sample to be tested is tested, and the result is accurate to 0.01g / cm 3 .

[0091] 2. Static bending strength test: According to Clause 4.7 of the national standard GB / T17657-2022 "Test methods for physical and chemical properties of wood-based panels and veneered wood-based panels", the static bending strength (three-point bending method) of the polyester cabinet board to be tested is tested, and the results are accurate to 0.1MPa.

[0092] 3. Nail holding force test: According to Clause 4.21 of the national standard GB / T17657-2022 "Test methods for physical and chemical properties of wood-based panels and veneered wood-based panels", the screw holding force (referred to as nail holding force) of the polyester cabinet board to be tested is tested, and the result is accurate to 10N.

[0093] 4. Formaldehyde test: According to Clause 4.61 of GB / T17657-2022 "Test methods for physical and chemical properties of wood-based panels and veneered wood-based panels", the formaldehyde emission of the polyester cabinet panels to be tested is tested, and the results are accurate to 0.01 mg / L.

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

[0095] 1. Preparation of enhancer

[0096] Enhancer Preparation Example 1:

[0097] 200 parts of water, 70 parts of MMA, 25 parts of BA, 5.0 parts of methacrylic acid, 0.5 parts of potassium persulfate, and 2.0 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 50° C. at a stirring speed of 100 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a polymer-1;

[0098] Then, 45 parts of LDPE, 3.0 parts of GMA, 5.0 parts of PEG, and 47 parts of the prepared high molecular polymer-1 were weighed, and added into a high-speed mixer, with a stirring frequency of 15 Hz, and mixed at room temperature for 5 minutes to obtain a reinforcing agent mixture;

[0099] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 100° C., the mold heating zone temperature was set at 105° C., and the confluence core temperature was set at 105° C., to obtain reinforcing agent-1.

[0100] Enhancer Preparation Example 2:

[0101] 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 parts of potassium persulfate, and 1.8 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 60° C. at a stirring speed of 120 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-2;

[0102] Then, 47 parts of LDPE, 4.0 parts of GMA, 4.0 parts of PEG, and 45 parts of the prepared high molecular polymer-2 were weighed, and added into a high-speed mixer, with a stirring frequency of 20 Hz, and mixed at room temperature for 4 minutes to obtain a reinforcing agent mixture;

[0103] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated through a screw extruder, wherein the barrel temperature was set to 100° C., the mold heating zone temperature was set to 105° C., and the confluence core temperature was set to 105° C., to obtain reinforcing agent preparation-2.

[0104] Enhancer Preparation Example 3:

[0105] 150 parts of water, 71.5 parts of MMA, 25 parts of EA, 3.5 parts of acrylic acid, 0.2 parts of potassium persulfate, and 2.0 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 65° C. at a stirring speed of 120 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-3;

[0106] Then, 48 parts of LDPE, 1.0 part of GMA, 3.0 parts of PEG, and 48 parts of the prepared high molecular polymer-3 were weighed and added into a high-speed mixer at a stirring frequency of 20 Hz and mixed at room temperature for 4 minutes to obtain a reinforcing agent mixture;

[0107] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 100° C., the mold heating zone temperature was set at 105° C., and the confluence core temperature was set at 105° C., to obtain reinforcing agent-3.

[0108] Enhancer Preparation Example 4:

[0109] 120 parts of water, 80 parts of MMA, 16 parts of BA, 4.0 parts of acrylic acid, 0.1 parts of potassium persulfate, and 1.5 parts of sodium dodecyl sulfate were weighed and added into a reactor and stirred and mixed. The system was heated to 70° C. at a stirring speed of 200 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a polymer-4;

[0110] Then, 40 parts of POE, 2.5 parts of ADR, 2.5 parts of PEG, and 55 parts of the prepared high molecular polymer-4 were weighed, and added into a high-speed mixer, with a stirring frequency of 30 Hz, and mixed at room temperature for 3 minutes to obtain a reinforcing agent mixture;

[0111] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set to 105° C., the mold heating zone temperature was set to 115° C., and the confluence core temperature was set to 115° C., to obtain reinforcing agent-4.

[0112] Enhancer Preparation Example 5:

[0113] 100 parts of water, 65 parts of MMA, 30 parts of BA, 5.0 parts of acrylic acid, 0.2 parts of ammonium persulfate, and 1.8 parts of sodium dodecyl sulfate were weighed and added into a reactor and stirred and mixed. The system was heated to 75° C. at a stirring speed of 150 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-5;

[0114] Then, 50 parts of POE, 1.5 parts of GMA, 3.5 parts of PEG, and 45 parts of the prepared high molecular polymer-5 were weighed, and added into a high-speed mixer, with a stirring frequency of 50 Hz, and mixed at room temperature for 2 minutes to obtain a reinforcing agent mixture;

[0115] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 90° C., the mold heating zone temperature was set at 95° C., and the confluence core temperature was set at 95° C., to obtain reinforcing agent-5.

[0116] Enhancer Preparation Example 6:

[0117] 100 parts of water, 70 parts of MMA, 27 parts of BA, 3.0 parts of methacrylic acid, 0.05 parts of ammonium persulfate, and 1.8 parts of sodium dodecyl sulfate were weighed and added into a reactor and stirred and mixed. The system was heated to 80° C. at a stirring speed of 300 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-6;

[0118] Then, 46 parts of POE, 5.0 parts of GMA, 5.0 parts of PEG, and 44 parts of the prepared high molecular polymer-6 were weighed, and added into a high-speed mixer, with a stirring frequency of 45 Hz, and mixed for 2.5 minutes at room temperature to obtain a reinforcing agent mixture;

[0119] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set to 110° C., the mold heating zone temperature was set to 115° C., and the confluence core temperature was set to 115° C., to obtain reinforcing agent-6.

[0120] Enhancer Preparation Example 7:

[0121] 100 parts of water, 90 parts of BMA, 5.0 parts of EA, 5.0 parts of methacrylic acid, 0.01 parts of ammonium persulfate, and 0.6 parts of sodium dodecyl sulfate were weighed and added into a reactor and stirred and mixed. The system was heated to 80° C. at a stirring speed of 60 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-7;

[0122] Then, 45 parts of LDPE, 0.5 parts of ADR, 0.5 parts of PEG, and 54 parts of the prepared high molecular polymer-7 were weighed and added into a high-speed mixer at a stirring frequency of 30 Hz and mixed at room temperature for 3 minutes to obtain a reinforcing agent mixture;

[0123] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set to 110° C., the mold heating zone temperature was set to 115° C., and the confluence core temperature was set to 115° C., to obtain reinforcing agent-7.

[0124] Enhancer Comparative Example 1:

[0125] 200 parts of water, 34.2 parts of MMA, 65 parts of BA, 0.8 parts of methacrylic acid, 0.5 parts of potassium persulfate, and 2.0 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 50° C. at a stirring speed of 100 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-1′;

[0126] Then, 45 parts of LDPE, 3.0 parts of GMA, 5.0 parts of PEG, and 47 parts of the prepared high molecular polymer-1' were weighed, and added into a high-speed mixer, with a stirring frequency of 15 Hz, and mixed at room temperature for 5 minutes to obtain a reinforcing agent mixture;

[0127] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 100° C., the die heating zone temperature was set at 105° C., and the confluence core temperature was set at 105° C. to obtain reinforcing agent-1′.

[0128] Enhancer Comparative Example 2:

[0129] 200 parts of water, 70 parts of MMA, 30 parts of BA, 0.5 parts of potassium persulfate and 2.0 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 50° C. at a stirring speed of 100 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-2';

[0130] Then, 45 parts of LDPE, 3.0 parts of GMA, 5.0 parts of PEG, and 47 parts of the prepared high molecular polymer 2' were weighed, and added into a high-speed mixer, with a stirring frequency of 15 Hz, and mixed at room temperature for 5 minutes to obtain a reinforcing agent mixture;

[0131] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 100° C., the die heating zone temperature was set at 105° C., and the confluence core temperature was set at 105° C. to obtain reinforcing agent-2′.

[0132] Enhancer Comparative Example 3:

[0133] 200 parts of water, 70 parts of MMA, 30 parts of BA, 0.5 parts of potassium persulfate and 2.0 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 50° C. at a stirring speed of 100 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular weight polymer-3';

[0134] Then, 45 parts of LDPE, 3.0 parts of GMA, and 52 parts of the prepared high molecular polymer 3' were weighed, and added into a high-speed mixer, with a stirring frequency of 15 Hz, and mixed at room temperature for 5 minutes to obtain a reinforcing agent mixture;

[0135] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 100° C., the die heating zone temperature was set at 105° C., and the confluence core temperature was set at 105° C. to obtain reinforcing agent-3′.

[0136] Enhancer Comparative Example 4:

[0137] 200 parts of water, 70 parts of MMA, 30 parts of BA, 0.5 parts of potassium persulfate and 2.0 parts of sodium dodecylbenzene sulfonate were weighed and added into a reactor and stirred and mixed. The system was heated to 50° C. at a stirring speed of 100 rpm to carry out polymerization reaction to obtain a polymer emulsion, which was then dried to obtain a high molecular polymer-4';

[0138] Then, 48 parts of LDPE and 52 parts of the obtained high molecular polymer 4' were weighed and added into a high-speed mixer at a stirring frequency of 15 Hz and mixed at room temperature for 5 minutes to obtain a reinforcing agent mixture;

[0139] Finally, the obtained reinforcing agent mixture was melt-extruded and granulated by a screw extruder, wherein the barrel temperature was set at 100° C., the die heating zone temperature was set at 105° C., and the confluence core temperature was 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 high molecular 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 polymer in the preparation examples and comparative examples of enhancers

[0142] Alkyl methacrylate Alkyl acrylate carboxylic acid High molecular polymer-1 70 MMA 25 copies of BA 5.0 parts methacrylic acid High molecular polymer-2 70 parts MMA, 10 parts BMA 15.5 BA 4.5 parts of methacrylic acid High molecular polymer-3 71.5 MMA 25 EAs 3.5 parts acrylic acid High molecular weight polymer-4 80 MMA 16 copies of BA 4.0 parts acrylic acid High molecular polymer-5 65 MMA 30 copies of BA 5.0 parts acrylic acid High molecular weight polymer-6 70 MMA 27 BA 3.0 parts methacrylic acid High molecular polymer-7 90 BMA 5.0 EA 5.0 parts methacrylic acid Polymer-1' 34.2 MMA 65 BA 0.8 parts of methacrylic acid Polymer-2' 70 MMA 30 copies of BA 0 Polymer-3' 70 MMA 30 copies of BA 0 Polymer-4' 70 MMA 30 copies of BA 0

[0143] Table 2 Main raw material formula of the preparation example and comparative example of the enhancer

[0144] Carrier resin Chain Extender Dispersants High molecular weight polymer Enhancer-1 45 parts LDPE 3.0 GMA 5.0 parts PEG 47 parts of polymer-1 Enhancer-2 47 parts LDPE 4.0 GMA 4.0 parts PEG 45 parts of polymer-2 Enhancer-3 48 parts LDPE 1.0 GMA 3.0 parts PEG 48 parts of polymer-3 Enhancer-4 40 POE 2.5 ADRs 2.5 parts PEG 55 parts polymer-4 Enhancer-5 50 POE 1.5 parts GMA 3.5 parts PEG 45 parts of polymer-5 Enhancer-6 46 POE 5.0 GMA 5.0 parts PEG 44 parts of high molecular polymer-6 Enhancer-7 45 parts LDPE 0.5 ADR 0.5 parts PEG 54 parts of polymer-7 Enhancer-1' 45 parts LDPE 3.0 GMA 5.0 parts PEG 47 parts of high molecular polymer-1' Enhancer-2' 45 parts LDPE 3.0 GMA 5.0 parts PEG 47 parts of high molecular polymer-2' Enhancer-3' 45 parts LDPE 3.0 GMA 0 52 parts of polymer-3' Enhancer-4' 48 parts LDPE 0 0 52 parts of high molecular polymer-4'

[0145] 2. Preparation of polyester cabinet board

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

[0147] Reinforcers-1 to -7 prepared as above were used as raw materials, and the corresponding examples for preparing polyester cabinet boards were numbered as Examples 1 to 7; Reinforcers-1' to -4' were used as raw materials, and the corresponding comparative examples for preparing polyester cabinet boards were numbered as 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. According to the formula in Table 3, each component is weighed and added into a high-speed mixer, and stirred at room temperature for 5 minutes at 30 Hz to obtain a polyester mixture;

[0149] (2) melt-extrude the obtained polyester mixture through a screw extruder, and perform skinning and foaming, wherein the barrel temperature of the screw extruder is set to 260° C., the temperature of the mold heating zone is set to 260° C., the temperature of the confluence core is set to 250° C., and the temperature of the setting plate is set to 25° C., to obtain a sheet;

[0150] Table 3 Formulation 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 board

[0155]

[0156]

[0157] According to the results in Table 4, it can be seen that the density of the plates obtained in Examples 1 to 7 is 0.35 to 0.80 g / cm 3 The static bending strength of the polyester cabinet board obtained is above 12.0MPa and the nail holding force is above 800N; the density of the boards obtained in Comparative Examples 1 to 4 is relatively high, all at 0.80g / cm 3 The above, and the static bending strength and nail holding force of the obtained polyester cabinet board are relatively low; this is because the reinforcing agent used in comparative examples 1 to 4 cannot increase the viscosity of the polyester material 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 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 board formula of the polyester cabinet board is shown in Table 5. According to the formula in Table 5, each component is weighed and added into a high-speed mixer, and stirred at room temperature for 5 minutes at 30 Hz to obtain a polyester mixture;

[0160] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 260°C, the temperature of the mold heating zone is set to 260°C, the confluence core temperature is set to 250°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0161] Table 5: Formulation of polyester cabinet board

[0162]

[0163]

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

[0165] Table 6 Performance test results of polyester cabinet board

[0166]

[0167] According to the results in Table 6, it can be seen that in Examples 8 to 10, the same reinforcing agent prepared in the same Example is selected and added in different amounts, and the density of the prepared polyester cabinet board is 0.35 to 0.80 g / cm 3 ; With the increase of the amount of reinforcing agent, the static bending strength and nail holding force of the polyester cabinet board gradually increase; in Comparative Examples 5 to 7, the same reinforcing agent prepared in the comparative example is selected and different amounts are added, and the density of the prepared polyester cabinet board is 0.80g / cm 3 As mentioned above, even if the amount of reinforcing agent added is increased, the static bending strength and nail holding force of the obtained polyester cabinet board are still relatively low; in Comparative Examples 8 and 9, the reinforcing agent obtained in the preparation example is selected, but the amount of addition is not between 12.0 and 20.0, and the prepared polyester board has a high density, and the static bending strength and nail holding force are both relatively low.

[0168] 3. Preparation process of polyester cabinet board:

[0169] Embodiment 11

[0170] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 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 parts of fumed silica, and 5.0 parts of magnesium oxide were added, and the mixture was stirred at room temperature for 5 minutes at 30 Hz to obtain a polyester mixture;

[0171] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 257° C., the temperature of the mold heating zone is set to 257° C., the confluence core temperature is set to 255° C., and the temperature of the shaping plate is set to 23° C. to obtain a sheet.

[0172] Example 12

[0173] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 3.8 parts of MSA-2215, 17.5 parts of reinforcing agent-1, 70.0 parts of heavy calcium carbonate, 4.6 parts of PE wax, 0.75 parts of fumed silica, and 4.8 parts of calcium oxide were added, and stirred at 30 Hz and room temperature for 5 minutes to obtain a polyester mixture;

[0174] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 255°C, the temperature of the mold heating zone is set to 255°C, the confluence core temperature is set to 250°C, and the temperature of the shaping plate is set to 23°C, to obtain a sheet.

[0175] Embodiment 13

[0176] (1) 100.0 parts of PETG were weighed and added into a high-speed mixer, and then 4.0 parts of MSA-2215, 18.5 parts of reinforcing agent-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 were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0177] (2) melt-extrude the obtained polyester mixture through a screw extruder, and perform skinning and foaming, wherein the barrel temperature of the screw extruder is set to 240° C., the temperature of the mold heating zone is set to 240° C., the temperature of the confluence core is set to 235° C., and the temperature of the setting plate is set to 25° C., to obtain a sheet;

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

[0179] Table 7 Board formula for polyester cabinet board

[0180]

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

[0182] Table 8 Performance test results of polyester cabinet board

[0183]

[0184] From the results of Examples 11 to 13, it can be seen that as the amount of inorganic filler increases significantly, the density of the obtained polyester cabinet board tends to increase, but is still within the range of 0.35 to 0.80 g / cm 3 Its static bending strength and nail holding force performance show a downward trend, but the static bending strength is still above 12.0MPa, and the nail holding force is above 800N, which meets the performance requirements.

[0185] 4. Preparation process of polyester cabinet board:

[0186] Embodiment 14

[0187] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 3.3 parts of MSA-2215, 15.5 parts of enhancer-2, 30.0 parts of heavy calcium carbonate, 4.2 parts of EBS, 0.5 parts of graphene, and 4.5 parts of calcium oxide were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0188] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 260°C, the temperature of the mold heating zone is set to 260°C, the confluence core temperature is set to 255°C, and the temperature of the shaping plate is set to 24°C, to obtain a sheet.

[0189] Embodiment 15

[0190] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 3.3 parts of MSA-2215, 15.5 parts of enhancer-2, 30.0 parts of heavy calcium carbonate, 4.2 parts of EBS, 0.6 parts of silica aerogel, and 4.8 parts of calcium oxide were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0191] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 250°C, the temperature of the mold heating zone is set to 250°C, the confluence core temperature is set to 255°C, and the temperature of the shaping plate is set to 24°C, to obtain a sheet.

[0192] Example 16

[0193] (1) 100.0 parts of PETG were weighed and added into a high-speed mixer, and then 3.6 parts of MSA-2215, 16.0 parts of reinforcing agent-2, 65.0 parts of light calcium carbonate, 4.6 parts of PE wax, 0.8 parts of graphene, and 5.0 parts of calcium oxide were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0194] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 255°C, the temperature of the mold heating zone is set to 255°C, the confluence core temperature is set to 250°C, and the temperature of the shaping plate is set to 24°C, to obtain a sheet.

[0195] Embodiment 17

[0196] (1) 100.0 parts of rPET were weighed and added into a high-speed mixer, and then 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 parts of fumed silica, and 4.3 parts of calcium oxide were added, and stirred at 30 Hz for 5 minutes to obtain a polyester mixture;

[0197] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 245°C, the temperature of the mold heating zone is set to 245°C, the confluence core temperature is set to 240°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0198] Comparative Example 10

[0199] (1) Weigh 100.0 parts of PET and add it into a high-speed mixer, then add 3.8 parts of MSA-2215, 18.0 parts of enhancer-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 foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 275°C, the temperature of the mold heating zone is set to 275°C, the confluence core temperature is set to 265°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0201] Comparative Example 11

[0202] (1) 100.0 parts of rPET were weighed and added into a high-speed mixer, and then 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 were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0203] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 272° C., the temperature of the mold heating zone is set to 272° C., the confluence core temperature is set to 262° C., and the temperature of the shaping plate is set to 25° C. to obtain a sheet.

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

[0205] Table 9 Board formula for polyester cabinet board

[0206]

[0207]

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

[0209] Table 10 Performance test results of polyester cabinet board

[0210]

[0211] It can be seen from the performance results of the cabinet boards prepared in Examples 14 to 17 and Comparative Examples 10 to 11 that after adding graphene, fumed silica, silica aerogel, etc. as nucleating agents, the obtained cabinet boards have excellent static bending strength and nail holding force properties; in the formulations of Comparative Examples 10 to 11, no nucleating agent is added or the added nucleating agent is not within a suitable range, the cabinet boards prepared therefrom require a higher processing temperature, and the board density is relatively high, and the static bending strength and nail holding force properties are poor.

[0212] 5. Preparation process of polyester cabinet board:

[0213] Embodiment 18

[0214] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 4.5 parts of MSA-2215, 16.4 parts of enhancer-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 parts of graphene, and 4.0 parts of calcium oxide were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0215] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 255°C, the temperature of the mold heating zone is set to 255°C, the confluence core temperature is set to 250°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0216] Embodiment 19

[0217] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 4.5 parts of MSA-2215, 16.4 parts of enhancer-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, 0.9 parts of graphene, and 3.0 parts of calcium oxide were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0218] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 255°C, the temperature of the mold heating zone is set to 255°C, the confluence core temperature is set to 250°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0219] Embodiment 20

[0220] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 4.5 parts of MSA-2215, 16.4 parts of enhancer-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 were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0221] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 260°C, the temperature of the mold heating zone is set to 260°C, the confluence core temperature is set to 255°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0222] Comparative Example 12

[0223] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 4.5 parts of MSA-2215, 16.4 parts of enhancer-5, 60.0 parts of heavy calcium carbonate, 6.0 parts of EBS, and 0.9 parts of graphene were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0224] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 255°C, the temperature of the mold heating zone is set to 255°C, the confluence core temperature is set to 250°C, and the temperature of the shaping plate is set to 25°C, to obtain a sheet.

[0225] Comparative Example 13

[0226] (1) 100.0 parts of PET were weighed and added into a high-speed mixer, and then 4.5 parts of MSA-2215, 16.4 parts of enhancer-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 were added, and the mixture was stirred at 30 Hz for 5 min to obtain a polyester mixture;

[0227] (2) The obtained polyester mixture is melt-extruded and foamed by a screw extruder, wherein the barrel temperature of the screw extruder is set to 258° C., the temperature of the mold heating zone is set to 258° C., the confluence core temperature is set to 252° C., and the temperature of the shaping plate is set to 25° C. to obtain a sheet.

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

[0229] Table 11 Board formula for cabinet board

[0230]

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

[0232] Table 12 Performance test results of cabinet board

[0233]

[0234] It can be seen from the performance results of the cabinet boards prepared in Examples 18 to 20 and Comparative Examples 12 to 13 that after adding the water absorbent to the formula, the hydrolysis of polyester can be effectively inhibited, and the density, static bending strength and nail holding force of the obtained cabinet boards are excellent; in the formula of Comparative Examples 12 to 13, no water absorbent is added or the added water absorbent is not within the appropriate range, and the prepared cabinet boards have high density, poor static bending strength and nail holding force.

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

[0236] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the spirit 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.

2. The enhancer according to claim 1, characterized in that 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.

3. The enhancer according to claim 1 or 2, characterized in that The high molecular weight polymer comprises the following components in parts by weight: 100 parts of the monomer composition, 0.4 to 4.0 parts of emulsifier, 0.01 to 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 to 95 parts of alkyl methacrylate, 4 to 30 parts of alkyl acrylate, 1.0 to 5.0 parts of carboxylic acid.

4. The enhancer according to claim 3, 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.

5. The method for preparing the enhancer according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: (1) Preparing a high molecular polymer: Weighing monomers such as alkyl methacrylate, alkyl acrylate, carboxylic acid, emulsifier, initiator and water respectively, stirring and mixing them uniformly, obtaining a polymer emulsion after polymerization reaction, and then drying to obtain the high molecular polymer; Preferably, the process conditions of the polymerization reaction for preparing the high molecular weight polymer include: The stirring speed is set at 60-500 rpm and the reaction temperature is 50-80°C; (2) respectively weighing a carrier resin, a chain extender, a dispersant and the high molecular weight polymer obtained in step (1), and mixing them to obtain a reinforcing agent mixture; (3) melt-extrude and granulate the reinforcing agent mixture obtained in step (2) using a screw extruder to obtain the reinforcing agent; Preferably, the process conditions of the melt extrusion granulation include: The barrel temperature of the screw extruder was set at 90-110°C, the temperature of the die 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 a lubricant, (f) 0.2 to 1.0 parts of a nucleating agent, (g) 1.0 to 5.0 parts of a water absorbing agent; Wherein, the enhancer is the enhancer according to any one of claims 1 to 4 or the enhancer prepared by the preparation method according to claim 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 talcum powder; 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 at 190-260°C, the temperature of the mold heating zone is set at 200-260°C, the temperature of the confluence core is set at 200-255°C, and the temperature of the shaping plate is set at 10-35°C.

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