A kind of foaming method of polystyrene foam material

Abstract

The foaming method of a polystyrene foam material disclosed in the present invention comprises the following steps: step S1: pre-foaming, raising the temperature of the foaming equipment to 80-120°C for pre-foaming, adding foaming particles, pre-foaming, and obtaining foamed particles A; step S2: foaming, foaming the foamed particles pre-foamed in step S1, and adding an antibacterial agent, the foaming temperature is 100-120°C, foaming, and obtaining foamed particles B; step S3: aging, aging the foamed particles obtained in step S2, using an aging cage for aging, and obtaining polystyrene foamed particles. The method first performs a pre-foaming process on the foamed particles, and the pre-foamed polystyrene already has a certain void structure. The antibacterial agent is added in the secondary foaming, and the antibacterial agent can efficiently penetrate into the void structure to improve the fixation of the antibacterial agent.

Description

Technical Field

[0001] The present application relates to a raw material for building materials, specifically a method for processing the raw material, and more specifically an antibacterial treatment method for a polystyrene foaming agent and its application on a board. Background Art

[0002] Antibacterial property is a functional finishing process that adds icing on the cake for building boards. Due to the complex use range of building boards, many building boards are used in high humidity and high temperature conditions, which are very easy to breed bacteria, making the surface or content of the building boards prone to mildew, which may affect the appearance of the building boards at the least, or even affect the strength and other functions of the building boards at the worst.

[0003] The antibacterial research on building boards in the prior art includes the patent CN217232385U in the prior art which discloses an environmentally friendly autoclaved aerated board, including a board base, characterized in that: a sound-absorbing layer is arranged on the outside of the board base, a wear-resistant layer is arranged on the outside of the sound-absorbing layer, a formaldehyde-removing and antibacterial layer is bonded to the outside of the wear-resistant layer by an adhesive, the board base includes a concrete main board, the concrete main board is evenly provided with multiple groups of reinforcing ribs, the reinforcing ribs are made of steel bar material as a whole, the reinforcing ribs are evenly distributed in the concrete main board in a cross shape, an anti-rust coating is arranged on the outside of the reinforcing ribs, the formaldehyde-removing and antibacterial layer is a layer of impregnated adhesive film paper with formaldehyde-removing and antibacterial material, the device is provided with a formaldehyde-removing protective layer, which can comprehensively remove free formaldehyde in the room and inactivate various pathogenic bacteria and molds, thereby achieving the formaldehyde-removing and antibacterial effect, and at the same time can greatly improve the overall strength of the autoclaved aerated board itself, greatly improving the overall practicality of the device. The formaldehyde-removing and antibacterial material used in this scheme is a mixture of chitosan, nano-silicon and nano-silver, which enables the formation of a formaldehyde-removing protective layer. However, due to the use of expensive antibacterial materials such as layered nano-silver, chitosan and nano-silicon, and the large amount used, the building board obtained by this preparation method is relatively high in cost.

[0004] In addition, the patent with publication number CN101747520B in the prior art also discloses a polystyrene foaming molding with a high foaming ratio and a manufacturing method thereof, and styrene is a raw material for preparing lightweight boards. The method disclosed includes coating a rubber resin on the surface of foamable polystyrene particles to form a covering layer, and foaming the polystyrene particles after the rubber resin is attached to the surface of the polystyrene particles to obtain a polystyrene foaming molding with a foaming ratio greater than 50 times. Among them, various modifiers can be added to the rubber resin layer, and the modifier is a wettability enhancer, a thixotropy imparting agent, an antibacterial agent, a freshness retainer or a conductive agent. This method can impart antibacterial properties to polystyrene by adding a modifier into the rubber resin layer. However, since the foaming ratio of polystyrene is greater than 50 times, the duration of the antibacterial property after foaming needs to be determined by the performance of the rubber resin, and the rubber resin is one or more of a modified acrylonitrile-butadiene copolymer, a modified acrylate-butadiene copolymer, a modified styrene-butadiene copolymer, and a modified methacrylate-butadiene copolymer. This treatment undoubtedly also increases the cost. At the same time, its preparation method requires mechanical coating of the resin, and there is a problem of complex preparation process difficulty.

[0005] Based on the antibacterial research on building panels in the prior art, the present disclosure intends to develop an antibacterial method for lightweight panels, which uses less antibacterial agent and is simpler to operate. Summary of the invention

[0006] The present invention is based on the problem that the antibacterial treatment of lightweight panels in the prior art often requires the use of a large amount of antibacterial agents or a relatively complex preparation method. The present invention provides a method for antibacterial treatment of a polystyrene foaming agent, in which the antibacterial agent is attached to the voids of polystyrene during the polystyrene foaming process, the amount of antibacterial agent used is small, and the antibacterial effect is excellent.

[0007] Specifically, one of the concepts of the present application is to provide a polystyrene foaming method, wherein the antimicrobial agent is arranged in the voids of the polystyrene foam during the foaming process.

[0008] Since polystyrene is foamed under high temperature conditions, it is mainly based on the foaming agent with a low boiling point in the foamed particles, such as pentane, with a boiling point of 30-40°C. Therefore, for the foaming conditions of polystyrene, the foaming temperature is generally between 60-120°C. When foamed under high temperature conditions, the foaming ratio of polystyrene can reach 20-50 times, and the foamed polystyrene has a porous structure.

[0009] Compared with the traditional method of loading the antimicrobial agent on the surface of the foamed particles before the polystyrene is foamed, the present invention has a large volume change during the polystyrene foaming process, and most of the antimicrobial agents on the surface will fall off. At the same time, under the condition of large surface area changes, the actual loaded antimicrobial agent is also unevenly dispersed. Therefore, the direct loading of the antimicrobial agent on the foamed particles will directly affect the antimicrobial effect. The present invention loads the antimicrobial agent into the voids of the polystyrene during the polystyrene foaming process, which can greatly reduce the use of the antimicrobial agent and achieve excellent antimicrobial performance.

[0010] Another concept of the present disclosure is to provide a polystyrene foaming method, wherein a gasifying agent is used when finishing the antibacterial agent, and the gasifying agent can make the antibacterial agent present a gasified state during the finishing process, and then evenly dispersed in the foamed polystyrene foam.

[0011] The antibacterial agent disclosed in the present invention is compounded with a gasifying agent. During the finishing process, the finishing agent can be formed into tiny particles and gasified and distributed by means of the high temperature of the foaming conditions of the foamed particles. The gasified and distributed antibacterial particles can penetrate into the tiny gaps of polystyrene during the foaming process and be fixed, thereby obtaining better antibacterial properties.

[0012] Specifically, the present disclosure provides a method for foaming a polystyrene foam material, characterized in that it comprises the following steps:

[0013] Step S1: pre-expansion, raising the temperature of the foaming equipment to 80-120°C for pre-expansion, controlling the steam supply, reducing the water content of the steam, adding foaming particles, and pre-expansion to obtain foaming particles A.

[0014] Step S2: Foaming: foaming the pre-expanded foamed particles in step S1, and adding an antibacterial agent, the foaming temperature is 100-120° C., and foaming is performed to obtain foamed particles B.

[0015] Step S3: Ripening: Ripening the foamed particles obtained in step S2 using a ripping cage to obtain a polystyrene foam material.

[0016] In some embodiments, the foamed particles in step S1 are polystyrene foamed particles;

[0017] Furthermore, in the step S1, the pre-heating temperature is 80-99°C, preferably, the pre-heating temperature is 85-95°C.

[0018] Furthermore, the pre-generated steam pressure in step S1 is 0.1-0.5 bar, preferably 0.1-0.3 bar.

[0019] Furthermore, the pre-release time in step S1 is 1-3 hours, preferably 1-2 hours.

[0020] In some embodiments, the foaming temperature in step S2 is 100-120°C, preferably 110-115°C.

[0021] Furthermore, the foaming pressure in step S2 is 0.2-0.6 bar, preferably 0.3-0.6 bar.

[0022] Furthermore, the foaming time in step S2 is 1-3 hours, preferably 1-2 hours.

[0023] In some embodiments, the density ratio of the foamed particles B obtained in step S2 to the foamed particles A obtained in step S1 is 1:1.4-1.6.

[0024] In some embodiments, the antibacterial agent added in step S2 is a quaternary ammonium antibacterial agent.

[0025] In some embodiments, the antibacterial agent added in step S2 is a quaternary ammonium salt solution.

[0026] Furthermore, the quaternary ammonium salt solution is a solution formed by a quaternary ammonium salt and a gasifying agent.

[0027] Furthermore, the gasifying agent is a mixture of water and ethanol, wherein the mass fraction of water is 20-30%.

[0028] Furthermore, the mass fraction of the quaternary ammonium salt content of the antibacterial agent quaternary ammonium salt solution is 2-10%.

[0029] Furthermore, the added amount of the antibacterial agent is 2-3% of the foamed particles A.

[0030] Furthermore, the aging cage has a metal mesh structure cage.

[0031] On the other hand, the present disclosure also provides an application of the polystyrene foam prepared by the present invention, wherein the polystyrene foam is used to prepare lightweight building panels.

[0032] The main benefits of the present invention are embodied in the following aspects:

[0033] 1. The present invention uses a double foaming process. First, the foamed particles are foamed in a pre-foaming process. The pre-foamed polystyrene already has a certain void structure, which is conducive to the antibacterial agent added during the foaming process to penetrate into the void structure and improve the fixation of the antibacterial agent.

[0034] 2. In the foaming process of the present invention, the added antibacterial agent is added in the form of a solution. In the foaming process, the foaming temperature is relatively high, and the antibacterial agent contains a gasifying agent, that is, alcohol has a relatively low boiling point and will quickly vaporize during the foaming process. During the vaporization process, the antibacterial agent in the solution will be evenly dispersed, thereby making the antibacterial agent evenly distributed in the overall system, which can improve the antibacterial properties of the polystyrene foam.

[0035] 3. In the foaming process of the present invention, the ethanol added in the antibacterial agent can promote the dispersion of the antibacterial agent on the one hand, and the low boiling point and gasification effect of ethanol are also a porogen, which can help polystyrene form a better void structure.

[0036] 4. In the present disclosure, the density range of the polystyrene foam during the pre-expansion and foaming processes is controlled, and this density range can be more conducive to the penetration and distribution of the antimicrobial agent. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] According to the present invention, the present invention provides a method for foaming a polystyrene foam material, characterized in that it comprises the following steps:

[0039] Step S1: pre-expansion, raising the temperature of the foaming equipment to 80-120°C for pre-expansion, controlling the steam supply, reducing the water content of the steam, adding foaming particles, and pre-expansion to obtain foaming particles A.

[0040] Wherein, the foamed particles in step S1 are polystyrene foamed particles;

[0041] The density of the polystyrene foam particles is 500-700 Kg / m 3 , preferably 600-700Kg / m 3 .

[0042] The pre-heating temperature in step S1 is 80-99°C, preferably, the pre-heating temperature is 85-95°C.

[0043] Furthermore, the pre-generated steam pressure in step S1 is 0.1-0.5 bar, preferably 0.1-0.3 bar.

[0044] The pre-production time in step S1 is 1-3 hours, preferably 1-2 hours.

[0045] In step S1 of the present disclosure, the polystyrene is pre-foamed, and the foamed polystyrene has a certain void structure, which is more conducive to the entry of the later finishing agent.

[0046] In some embodiments, the foaming method of a polystyrene foam material further includes step S2: foaming, foaming the foamed particles pre-expanded in step S1, and adding an antibacterial agent, the foaming temperature is 100-120°C, and the foaming is performed to obtain foamed particles B.

[0047] Wherein, the foaming temperature in step S2 is 100-120°C, preferably 110-115°C.

[0048] Furthermore, the foaming pressure in step S2 is 0.2-0.6 bar, preferably 0.3-0.6 bar; specifically, the steam pressure may be 0.4 bar or 0.5 bar.

[0049] Furthermore, the foaming time in step S2 is 1-3 hours, preferably 1-2 hours; the specific foaming time may be 2 hours or 3 hours.

[0050] In some embodiments, the density ratio of the foamed particles B obtained in step S2 to the foamed particles A obtained in step S1 is 1:1.4-1.6.

[0051] In some embodiments, the antibacterial agent added in step S2 is a quaternary ammonium antibacterial agent, and the quaternary ammonium antibacterial agent is didecyldimethylammonium bromide and / or didecyldimethylammonium chloride.

[0052] Furthermore, the antibacterial agent is didecyldimethylammonium bromide and / or didecyldimethylammonium chloride solution.

[0053] The mass fraction of didecyldimethylammonium bromide and / or didecyldimethylammonium chloride in the solution is 2-10%, which may be 5%, 6%, or 7%.

[0054] The antibacterial agent is didecyldimethylammonium bromide and / or didecyldimethylammonium chloride solution, and the solvent is ethanol aqueous solution, wherein the mass fraction of water in the ethanol aqueous solution is 20-30%, specifically, the water content can be 20%, 25% or 30%.

[0055] In some embodiments, the amount of the antibacterial agent added in step 2 is 2-3% of the foamed particles A.

[0056] In some embodiments, the foaming method of a polystyrene foam material further includes step S3: aging, aging the foamed particles obtained in step S2 using a aging cage to obtain a polystyrene foam material.

[0057] Specific Example: The foaming material is prepared according to the above steps S1-S3. The specific process is shown in the following table:

[0058] Comparative Example 1: A foaming material was prepared according to the aforementioned steps S1-S3. The foaming raw material used was soaked in an antibacterial agent of 3% didecyldimethylammonium bromide 20% ethanol aqueous solution, and foamed after soaking and absorption. The foaming conditions were the same as those in Example 4 to obtain a foaming material. The antibacterial rate of the obtained foaming material was less than 10%.

[0059] From the results of the embodiments, it can be seen that when we process the foaming agent into the raw material, due to the poor foaming conditions of polystyrene and the large volume change, although the raw material of Comparative Example 1 uses an antibacterial agent, it is almost difficult to see that the final foamed material has antibacterial properties.

[0060] From Examples 1-5, it can be seen that the antibacterial agent added during the foaming process obviously has certain antibacterial properties, especially when the antibacterial agent uses ethanol aqueous solution as a solvent, it can be clearly seen that the foaming material has antibacterial ability.

[0061] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for foaming a polystyrene foam material, characterized in that: The steps include: Step S1: pre-expansion, raising the temperature of the foaming equipment to 80-99° C. for pre-expansion, adding foaming particles, and pre-expansion to obtain foaming particles A; Step S2: foaming, foaming the pre-expanded foamed particles in step S1, adding an antibacterial agent, and foaming at a foaming temperature of 100-120° C. to obtain foamed particles B; Step S3: Ripening, aging the foamed particles obtained in step S2 using a aging cage to obtain a polystyrene foam material; The pre-generated steam pressure in step S1 is 0.1-0.5 bar; The pre-release time in step S1 is 1-3 hours; The foaming steam pressure in step S2 is 0.2-0.6 bar; The foaming time in step S2 is 1-3h; The density ratio of the expanded particles B obtained in step S2 to the expanded particles A obtained in step S1 is 1:1.4-1.6; The antibacterial agent added in step S2 is a quaternary ammonium salt antibacterial agent; The antibacterial agent is a quaternary ammonium salt solution; the quaternary ammonium salt solution is a solution formed by a quaternary ammonium salt and a gasifying agent; the gasifying agent is a mixture of water and ethanol; Wherein, the mass fraction of the water is 20-30%.

2. A foaming method for a polystyrene foam material as claimed in claim 1, characterized in that: The mass fraction of the quaternary ammonium salt content of the antibacterial agent quaternary ammonium salt solution is 2-10%.

3. A foaming method for a polystyrene foam material as claimed in claim 2, characterized in that: The added amount of the antibacterial agent is 2-3% of the foamed particles A.

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