CN214491939U

CN214491939U - Expandable thermoplastic foam filled honeycomb core

Info

Publication number: CN214491939U
Application number: CN202023289650.2U
Authority: CN
Inventors: 杨春壮; 邵水玉
Original assignee: Hangzhou Zhihe New Material Co ltd
Current assignee: Hangzhou Zhihe New Material Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-10-26
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a honeycomb core is filled to expandable thermoplastic foam, including upper and lower three layer construction, upper and lower two-layer is the thermoplasticity epidermis, and the centre is plastics honeycomb core or paper honeycomb core the dispersion has expandable thermoplastic particles or prefoaming particle in the honeycomb holes of plastics honeycomb core or paper honeycomb core. The foam body can be foamed for the second time in the subsequent heating process to fill the honeycomb core, so that the foam body is bonded with the honeycomb wall into a whole under the action of heat, and the foam body can fill the whole honeycomb core; in addition, flame-retardant particles can be dispersed in honeycomb holes to obtain a foam-filled flame-retardant honeycomb core; the density and the strength of the filled foam can be conveniently adjusted by the scattering amount of the particles, and the honeycomb core is low in production cost, simple to operate and control and low in equipment investment, and is a foam-filled honeycomb core with an industrial prospect.

Description

Expandable thermoplastic foam filled honeycomb core

Technical Field

The utility model relates to a honeycomb core is filled to expandable thermoplastic foam belongs to combined material technical field.

Background

The sandwich board is a sandwich board, is a board formed by compounding an upper skin layer, a lower skin layer and a middle core material through glue or hot melting, has the characteristics of light weight and high strength, and is widely applied to the fields of buildings, furniture, automobiles and the like. The middle core material is a honeycomb core or a foam core, and the honeycomb core is called a honeycomb plate and comprises a PP (polypropylene) honeycomb plate, a paper honeycomb plate, an aluminum honeycomb plate, a corrugated paper honeycomb plate and the like; the foam core is called a foam honeycomb board and comprises a PP foam board, an EPS foam board, an XPS foam board, a PU foam board, a PVC foam board and the like. The two types of boards have respective characteristics, but have respective defects and shortcomings, such as low strength when the density of the foam board is low; the honeycomb plate is generally high in strength, but does not preserve heat and insulate heat, and the honeycomb wall is poor in support property and free of rebound resilience.

At present, some products combine foam and honeycomb to form a foam-filled honeycomb plate, combine the characteristics of the foam and the honeycomb, are mainly in the development stage, are immature in production process, cannot supply in batches, and mainly focus on the combination of polyurethane foam and the honeycomb. Meanwhile, there are a few patents relating to EPS foam filling of honeycomb cores, but only pure foam filling, without feasibility of process implementation. The following chinese patents disclose these types of products:

chinese patent CN103587159A discloses a honeycomb sandwich panel and a manufacturing method thereof, which is to press foamed polyurethane foam sheets into a honeycomb core by using temperature and pressure to form a foam-filled sandwich panel. The method requires that the honeycomb core has higher strength and certain support property for high temperature, and the foam cannot be completely pressed into the honeycomb core, so that the strength and the stability of the product are influenced.

Chinese patent CN102514349A discloses a method for manufacturing a sandwich faced board with a honeycomb composite foam structure for buildings, which is to pour polyurethane foaming liquid into a mould, and then put the mould into a honeycomb core to form a foam-filled honeycomb board. The method is a mature and feasible method for producing the foam honeycomb core at present, but the polyurethane filling product has poor recycling and environmental protection properties, cannot be softened and molded by secondary heating, and has certain limitation on application.

Chinese patent CN1301189C discloses a continuous production process of a paper honeycomb board with sound-proof and heat-insulating filling materials, which comprises the following steps: filling one or more of expanded perlite, vermiculite powder, aluminum silicate, glass wool, short fibers of mineral rock wool and polystyrene particles into the honeycomb core by adopting a conveyor belt scattering and scraping mode, and then gluing to compound the board. Although the honeycomb core is filled with foam or light aggregate, the filler is loose, no adsorption is generated on the honeycomb wall, the method is loose filling, and the method has certain effects on strength, sound insulation and heat insulation, but the effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a honeycomb core is filled to expandable thermoplastic foam solves the problem that the honeycomb core industrialization production difficulty is filled to the thermoplastic foam, the packing is not abundant and foam and honeycomb base member can not form the bonding is whole. The utility model discloses a honeycomb core adopts thermoplasticity honeycomb core or paper honeycomb core, expandable thermoplastic or prefoaming body, makes through the compounding machine, can make the honeycomb core that the foam was filled in convenient, quick production.

The utility model adopts the technical proposal that:

an expandable thermoplastic foam-filled honeycomb core comprises an upper layer, a middle layer and a lower layer, wherein the upper layer and the lower layer are thermoplastic skins, the middle layer is a plastic honeycomb core or a paper honeycomb core, and expandable thermoplastic plastic particles or pre-expanded particles are dispersed in honeycomb holes of the plastic honeycomb core or the paper honeycomb core, and flame-retardant particles can be dispersed in the honeycomb holes.

In the above technical solution, the particle diameter of the expandable thermoplastic particles or pre-expanded particles is smaller than the pore diameter of the 1/3 honeycomb core, and the expansion ratio after heating is larger than 1. The expandable thermoplastic plastic particles or the pre-expanded particles are expandable polystyrene, pre-expanded polypropylene, pre-expanded polyethylene or a pre-expanded polyethylene polypropylene mixture.

Further, the plastic honeycomb core is one of a polypropylene honeycomb core, a polycarbonate honeycomb core, a polyvinyl chloride honeycomb core, a polyethylene honeycomb core and a nylon honeycomb core or a flame-retardant honeycomb core. The paper honeycomb core is one of a corrugated paper honeycomb core, a hexagonal honeycomb core and a paper-plastic honeycomb core.

Furthermore, the thermoplastic skin is a non-woven fabric or a film or a plate or a fiber reinforced sheet formed by thermoplastic plastics; the gram weight is 6-2000g/m². The thermoplastic plastic can be one of polypropylene, modified polypropylene, polyethylene, modified polyethylene, polystyrene, modified polystyrene, nylon, modified nylon, polyester and modified polyester.

The utility model has the advantages that:

1) the utility model adopts the particles or pre-foaming body which is not foamed or has lower foaming multiplying power as the filling, and can be foamed for the second time in the subsequent heating process to fill the honeycomb core, so that the foaming body is bonded with the honeycomb wall into a whole under the action of heat, and the foaming body can fill the whole honeycomb core;

2) the honeycomb core of the utility model can conveniently adjust the density, strength and the like of the filling foam by adjusting the scattering amount of the expandable thermoplastic particles or the pre-foaming body;

3) flame-retardant particles are doped into expandable thermoplastic particles or pre-foaming bodies and dispersed into the honeycomb core, so that the flame-retardant honeycomb core can be conveniently produced;

4) the structure can produce a low density foam filled honeycomb core while maintaining the required strength due to the supporting action of the honeycomb core.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

Detailed Description

As shown in figure 1, an expandable thermoplastic foam filled honeycomb core comprises an upper layer structure, a middle layer structure and a lower layer structure, wherein the upper layer structure, the lower layer structure and the lower layer structure are composite skin 3 at two sides, and the middle layer structure is a plastic or paper honeycomb core 1 with expandable thermoplastic plastic particles or pre-expanded particles 2 dispersed in honeycomb holes. In addition, flame retardant particles may be dispersed within the honeycomb core. The particle diameter of the expandable thermoplastic plastic particles or the pre-expanded particles is less than the pore diameter of the 1/3 honeycomb core, the expansion ratio after heating is more than 1, and the expandable thermoplastic plastic particles or the pre-expanded particles can be one or a mixture of more of expandable polystyrene, pre-expanded polypropylene, pre-expanded polyethylene and pre-expanded polyethylene polypropylene mixture. The composite skin is 6-2000g/m²A nonwoven fabric or film or sheet or fiber-reinforced sheet formed of the thermoplastic of (1); the thermoplastic plastic can be one or a mixture of more of polypropylene, modified polypropylene, polyethylene, modified polyethylene, polystyrene, modified polystyrene, nylon, modified nylon, polyester and modified polyester.

During preparation, the lower surface skin is firstly laid on a conveyor belt, a plastic or paper honeycomb core is placed on the lower surface skin, then granular expandable thermoplastic plastic particles or pre-foaming bodies (and flame retardant particles) are quantitatively scattered into the honeycomb core through a powder scattering machine, the upper surface skin is laid, then the honeycomb core is fed into a continuous compounding machine, the set temperature is 100-250 ℃, and the foam-filled honeycomb core can be obtained through heating and cooling.

Example 1

First, 30g/m was laid on a conveyor belt²The PP non-woven fabric is characterized in that a paper honeycomb core with the aperture of about 10mm and the thickness of 15mm is placed on the non-woven fabric; then, the mixture is passed through a powder spreader, and about 100g/m of the mixture is spread therein²Then laying a layer of 30g/m of expandable polystyrene granules²The PP non-woven fabric enters a compounding machine, the temperature of the compounding machine is set to be 160 ℃, and the speed of the compounding machine is controlledThe temperature is 3m/min, the gap is 15mm, and after cooling, the polystyrene foam filling paper honeycomb core with the thickness of 15mm and the PP compounded on the two sides is obtained.

Example 2

First, 20g/m of the coating was laid on a conveyor belt²The PP non-woven fabric is characterized in that a polypropylene honeycomb core with the aperture of about 15mm and the thickness of 10mm is placed on the non-woven fabric; then, the mixture is passed through a powder spreader, and about 150g/m is spread therein²Pre-foaming EPP small particles and flame-retardant particles, and laying a layer of 20g/m²The PP non-woven fabric enters a compounding machine, the temperature of the compounding machine is set to be 180 ℃, the speed is 4m/min, the gap is 10mm, and after cooling, the polypropylene foam filled polypropylene flame-retardant honeycomb core with the thickness of 10mm is obtained.

Claims

1. The expandable thermoplastic foam filled honeycomb core is characterized by comprising an upper layer structure, a middle layer structure and a lower layer structure, wherein the upper layer structure and the lower layer structure are thermoplastic skins, the middle layer structure is a plastic honeycomb core or a paper honeycomb core, and expandable thermoplastic plastic particles or pre-expanded particles are dispersed in honeycomb holes of the plastic honeycomb core or the paper honeycomb core.

2. The expandable thermoplastic foam-filled honeycomb core of claim 1 wherein the expandable thermoplastic particles or pre-expanded particles have a particle size of less than 1/3 cell size of the honeycomb core and an expansion ratio of greater than 1 after heating.

3. The expandable thermoplastic foam-filled honeycomb core according to claim 1, wherein the expandable thermoplastic particles or pre-expanded particles are expandable polystyrene, pre-expanded polypropylene, pre-expanded polyethylene, or a mixture of pre-expanded polyethylene and polypropylene.

4. The expandable thermoplastic foam-filled honeycomb core of claim 1, wherein said plastic honeycomb core is one of a polypropylene honeycomb core, a polycarbonate honeycomb core, a polyvinyl chloride honeycomb core, a polyethylene honeycomb core, and a nylon honeycomb core.

5. The expandable thermoplastic foam-filled honeycomb core of claim 1, wherein the paper honeycomb core is one of a corrugated honeycomb core, a hexagonal honeycomb core, and a paper-plastic honeycomb core.

6. The expandable thermoplastic foam-filled honeycomb core according to claim 1, wherein the thermoplastic skin is a nonwoven or film or sheet or fiber-reinforced sheet formed of a thermoplastic; the gram weight is 6-2000g/m²。

7. The expandable thermoplastic foam-filled honeycomb core of claim 6 wherein the thermoplastic is one of polypropylene, modified polypropylene, polyethylene, modified polyethylene, polystyrene, modified polystyrene, nylon, modified nylon, polyester, modified polyester.

8. The expandable thermoplastic foam filled honeycomb core is characterized by comprising an upper layer structure, a middle layer structure and a lower layer structure, wherein the upper layer structure and the lower layer structure are thermoplastic skins, the middle layer structure is a plastic honeycomb core or a paper honeycomb core, and expandable thermoplastic plastic particles or pre-expanded particles and flame-retardant particles are dispersed in honeycomb holes of the plastic honeycomb core or the paper honeycomb core.