CN101332693B

CN101332693B - Polyurethane plate with metallic plate liner and foaming method thereof

Info

Publication number: CN101332693B
Application number: CN 200810039287
Authority: CN
Inventors: 万承林; 王庶民
Original assignee: Shanghai Lishen Scientific Equipment Co Ltd
Current assignee: Shanghai Lishen Scientific Equipment Co Ltd
Priority date: 2008-06-20
Filing date: 2008-06-20
Publication date: 2012-04-18
Anticipated expiration: 2028-06-20
Also published as: CN101332693A

Abstract

The invention aims at disclosing a polyurethane plate with a metal plate lined internally and a foaming method of the polyurethane plate, which solves the cracking problem of the polyurethane and the metal plate in the polyurethane plate due to the large difference of linear expansion coefficient when the temperature changes. The polyurethane plate comprises a metal plate and is characterized in that a foamed soft polyurethane layer is covered outside the metal plate; the soft polyurethane layer is externally coated by a foamed hard polyurethane layer; therefore, the elasticity of the soft polyurethane is effectively used for leading the linear expansion difference of the metal plate and the polyurethane to be counteracted by the elastic deformation of the soft polyurethane; the hard polyurethane on the external layer is not cracked even when the slight crack occurs at the middle layer of soft polyurethane, thus realizing the objects of the invention.

Description

The polyurethane sheet of inner liner metal plate and foaming method thereof

Technical field

The present invention relates to a kind of polyurethane sheet and foaming method thereof, particularly a kind ofly be used to be incubated and the polyurethane sheet and the foaming method thereof of the inner liner metal plate of the certain intensity of needs again.

Background technology

At present, the polyurethane foam The Application of Technology is very extensive, and polyurethane not only has certain intensity but also good insulation, insulation and water proofing property are arranged, and cost is also lower; But in practical application, the intensity of depending merely on hard polyaminoester itself generally is employed in the mode of inner liner metal plate in the polyurethane foam not enough for the intensity that improves polyurethane sheet; What the metallic plate of liner was relatively more commonly used is steel plate and aluminium sheet; When this type polyurethane sheet suffers external impact, only can cause the destruction of polyurethane face and the distortion of metallic plate, strengthen the integral protection performance of polyurethane sheet; After also can preventing the polyurethane sheet foaming, the distortion of polyurethane sheet during the demoulding.

But because liner metallic plate in polyurethane sheet differs bigger with the linear expansion coefficient that foaming is coated on the hard polyaminoester outside the metallic plate, such as at-40 ℃～+ 100 ℃, the linear expansion coefficient of polyurethane is 4～10 * 10 ^-5/ ℃, the linear expansion coefficient of ordinary carbon steel is 1.2 * 10 ^-5/ ℃, the linear expansion coefficient of aluminium is 2.3 * 10 ^-5/ ℃, and in most cases the temperature range that need use of polyurethane sheet is very wide, requires at-40 ℃～+ 100 ℃, the different coefficients of expansion can cause when heating and cooling the polyurethane in the polyurethane sheet and metallic plate to peel off and produce cracking; And the thermal coefficient of expansion of hard polyurethane foams receives the influence of density, and in wider temperature range, the linear expansion coefficient value of hard polyurethane foams changes little, and when the density of hard polyurethane foams increased, its linear expansion coefficient slightly reduced.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of polyurethane sheet and foaming method thereof of inner liner metal plate, solved the problem of the cracking that polyurethane and metallic plate cause because linear expansion coefficient differs big when variations in temperature in the polyurethane sheet.

Technical problem to be solved by this invention can realize through following technical scheme:

A kind of polyurethane sheet of inner liner metal plate, it comprises metallic plate, it is characterized in that, and the outer foaming of said metallic plate is coated with one deck flexibel polyurethane layer, and foaming is coated with one deck hard polyaminoester layer outside said flexibel polyurethane layer.

For said flexibel polyurethane layer is coated on the said metallic plate securely, said metallic plate is provided with some through holes.

The density of said flexibel polyurethane layer is 40 ± 5kg/m3.

The thickness of said flexibel polyurethane layer is 3～4mm.

The density of said hard polyaminoester layer is 500 ± 20kg/m3.

A kind of foaming method of polyurethane sheet of inner liner metal plate is characterized in that it comprises the steps:

(1) flexibel polyurethane of foamed low density on said metallic plate;

(2) the highdensity hard polyaminoester of foaming outside flexibel polyurethane is processed polyurethane sheet.

The polyurethane sheet of inner liner metal plate of the present invention and foaming method thereof; Effectively utilize the elasticity of flexibel polyurethane; The difference of the line expansion of metallic plate and polyurethane is offset in the elastic deformation of flexibel polyurethane; Even slight cracking is arranged also on the flexibel polyurethane of intermediate layer, and outer field hard polyaminoester is split, realize the object of the invention.

Description of drawings

Fig. 1 is the structural representation of foaming flexibel polyurethane of the present invention;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the structural representation of blown rigid polyurethane of the present invention;

Fig. 4 is the vertical view of Fig. 3.

The specific embodiment

For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.

As shown in Figure 3, a kind of polyurethane sheet of inner liner metal plate, it comprises metallic plate 1, and metallic plate 1 outer foaming is coated with one deck flexibel polyurethane layer 2, and foaming is coated with one deck hard polyaminoester layer 3 outside flexibel polyurethane layer 2.

Metallic plate 1 is provided with some through holes; Flexibel polyurethane layer 2 is coated on the metallic plate 1 securely; The density that is coated on the flexibel polyurethane layer 2 on the metallic plate 1 is 40 ± 5kg/m3; The thickness of flexibel polyurethane layer 2 is 3～4mm, and the density that is coated on the hard polyaminoester layer 3 outside the flexibel polyurethane layer 2 is 500 ± 20kg/3; When polyurethane sheet of the present invention be in variations in temperature than overall situation in the time; Being coated on the line that the outer flexibel polyurethane layer 2 of metallic plate 1 can absorb polyurethane expands; Elastic deformation takes place in flexibel polyurethane layer 2; Because flexibel polyurethane layer 2 is lower with respect to the density of hard polyaminoester layer 3; The difference that has absorbed the line expansion of metallic plate 1 and polyurethane is effectively also offset in the elastic deformation of flexibel polyurethane layer 2, also is on flexibel polyurethane layer 2 even slight cracking is arranged, and outer field hard polyaminoester layer 3 is split.

Referring to Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, a kind of foaming method of polyurethane sheet of inner liner metal plate, it comprises the steps: (1) flexibel polyurethane of foamed low density on said metallic plate; (2) the highdensity hard polyaminoester of foaming outside flexibel polyurethane is processed polyurethane sheet; The i.e. first flexibel polyurethane of foamed low density on metallic plate 1 is then at the skin highdensity hard polyaminoester that foams.

Polyurethane sheet of the present invention can be made the polyurethane sheet of different-thickness as required through the thickness that changes metallic plate 1 and hard polyaminoester layer 3, and can produce profile and the corner shape that needs through mould.

More than show and described basic principle of the present invention and principal character and advantage thereof.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. the polyurethane sheet of an inner liner metal plate, it comprises metallic plate, it is characterized in that, and the outer foaming of said metallic plate is coated with one deck flexibel polyurethane layer, and said flexibel polyurethane layer outside, foaming is coated with one deck hard polyaminoester layer; The density of said flexibel polyurethane layer is 40 ± 5kg/m ³, thickness is 3～4mm; The density of said hard polyaminoester layer is 500 ± 20kg/m ³

2. polyurethane sheet as claimed in claim 1 is characterized in that, said metallic plate is provided with and somely makes said flexibel polyurethane layer be coated on the through hole on the said metallic plate securely.

3, a kind of foaming method of polyurethane sheet of the plate of inner liner metal according to claim 1 is characterized in that it comprises the steps:

(1) flexibel polyurethane of foamed low density on said metallic plate;