Box body thermal insulation layer integral foaming material and preparation method thereof

Abstract

The invention discloses an integral foaming material for a box body thermal insulation layer. The integral foaming material for the box body thermal insulation layer comprises the following raw materials: 50-80 parts of matrix resin, 20-40 parts of filler, 3-5 parts of a foaming agent, 1-2 parts of a catalyst, 1-2 parts of a cross-linking agent, 0.5-1 part of a surfactant and a proper amount of a release agent, the invention also provides a preparation method of the integral foaming material for the box body thermal insulation layer. The preparation method comprises the following steps: S1, uniformly mixing and stirring the matrix resin, the filler, the foaming agent, the catalyst, the cross-linking agent and the surfactant according to the proportion; s2, the mixed materials are poured into a mold, and the mold is put into a preheated foaming box for foaming; s3, foaming temperature and pressure are controlled, so that the foaming agent is fully expanded and uniformly distributed in the material; uniform foaming of the thermal insulation material can be achieved, and the stability of the thermal insulation performance is improved. And secondly, the technology can reduce the usage amount of the foaming agent, reduce environmental pollution, improve the production efficiency and reduce the production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foaming materials, in particular to a box thermal insulation layer integral foaming material and a preparation method thereof. BACKGROUND

[0002] In the field of refrigeration, thermal insulation and the like, the thermal insulation performance of a box is one of the key factors. The traditional thermal insulation layer of a box is mostly filled or foamed with a filler, which has the following technical problems.

[0003] 1. Inhomogeneous foaming, large gap in the thermal insulation layer;

[0004] 2. Unstable foaming speed, large difference in bubble size;

[0005] 3. Inhomogeneous pressure during foaming, resulting in structural deformation and dead angle coverage, and leakage points;

[0006] Therefore, it is necessary to develop an efficient and environmentally friendly box thermal insulation layer integral foaming technology to solve the problem. At present, most brands use foam board filling or polyurethane foaming agent. Some manufacturers use polyurethane foaming agent, layer by layer, and after foaming, a layer of foam board is filled. The gap is relatively large, the thermal insulation layer has many leakage points, the thermal insulation effect is poor, and condensate water is easily generated when there is a temperature difference, which causes corrosion of the machine body and pollution and damage to the machine. Polyurethane foaming agent: rapid foaming, large bubbles, inhomogeneous filling, better thermal insulation effect than foam board, but also has many gaps, and large dose can also squeeze the sheet metal, causing structural deformation. SUMMARY

[0007] The present application relates to the technical field of foaming materials, in particular to a box thermal insulation layer integral foaming material and a preparation method thereof.

[0008] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0009] A box thermal insulation layer integral foaming material, the raw materials of the box thermal insulation layer integral foaming material comprising: 50-80 parts of base resin, 20-40 parts of filler, 3-5 parts of foaming agent, 1-2 parts of catalyst, 1-2 parts of crosslinking agent, 0.5-1 parts of surfactant, and appropriate amount of release agent.

[0010] Preferably, the base resin is polyurethane or polyethylene.

[0011] Preferably, the filler is glass fiber or aluminum silicate fiber.

[0012] Preferably, the foaming agent is HCFC-141b or HFC-245fa.

[0013] Preferably, the catalyst is an organic tin compound or a derivative thereof.

[0014] Preferably, the cross-linking agent is a polyol.

[0015] The present application also provides a preparation method of the box thermal insulation layer integral foaming material, comprising the following steps:

[0016] S1, the base resin, filler, foaming agent, catalyst, cross-linking agent and surfactant are mixed and stirred uniformly according to the above proportion;

[0017] S2, the mixed material is poured into the mold and placed in the preheated foaming box for foaming;

[0018] S3, the foaming temperature and pressure are controlled, so that the foaming agent fully expands and uniformly distributes in the material;

[0019] S4, after the foaming is completed, the foamed thermal insulation layer is taken out and cooled and solidified;

[0020] S5, according to the need, the thermal insulation layer is cut, polished, sprayed and other post-processing.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1, the uniform foaming of the thermal insulation material can be realized, and the stability of the thermal insulation performance is improved. Secondly, the use amount of the foaming agent can be reduced, and the environmental pollution can be reduced.

[0023] 2, the production efficiency can be improved, and the production cost can be reduced. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0025] Example one

[0026] A box thermal insulation layer integral foaming material, a box thermal insulation layer integral foaming material raw material includes: base resin: 50 parts, filler: 20 parts, foaming agent: 3 parts, catalyst: 1 part, cross-linking agent: 1 part, surfactant: 0.5 parts, release agent: appropriate amount.

[0027] The base resin is polyethylene.

[0028] The filler is aluminum silicate fiber.

[0029] The blowing agent is HFC-245fa.

[0030] The catalyst is its derivative.

[0031] Example 2

[0032] A box body insulation layer integral foaming material, a box body insulation layer integral foaming material raw materials include: base resin: 65 parts, filler: 30 parts, foaming agent: 4 parts, catalyst: 1.5 parts, cross-linking agent: 1.5 parts, surfactant: 0.75 parts, release agent: appropriate amount.

[0033] The base resin is polyurethane.

[0034] The filler is glass fiber.

[0035] The blowing agent is HCFC-141b.

[0036] The catalyst is an organotin compound.

[0037] Example 3

[0038] A box body insulation layer integral foaming material, the raw materials of the box body insulation layer integral foaming material include: base resin: 80 parts, filler: 40 parts, foaming agent: 5 parts, catalyst: 2 parts, cross-linking agent: 2 parts, surfactant: 1 part, release agent: appropriate amount.

[0039] The base resin is polyethylene.

[0040] The filler is aluminum silicate fiber.

[0041] The blowing agent is HFC-245fa.

[0042] The catalyst is an organotin compound.

[0043] The present invention also provides a method for preparing an integral foam material for a box insulation layer, comprising the following steps:

[0044] S1. Mix the base resin, filler, foaming agent, catalyst, cross-linking agent and surfactant in the above proportions and stir evenly;

[0045] S2. Pour the mixed material into a mold and place it in a preheated foaming box for foaming;

[0046] S3. Control the foaming temperature and pressure to allow the foaming agent to fully expand and evenly distribute in the material;

[0047] S4, after the foaming is completed, the foamed insulation layer is taken out, cooled and solidified;

[0048] S5. Perform post-processing such as cutting, grinding, and spraying on the insulation layer as needed.

[0049] The box insulation layer integral foam material prepared in Example 1 was tested, and the results are shown in the following table:

[0050]

[0051]

[0052] The box insulation layer integral foam material prepared in Example 2 was tested, and the results are shown in the following table:

[0053]

[0054] The box insulation layer integral foam material prepared in Example 2 was tested, and the results are shown in the following table:

[0055]

[0056] The performance of the foam insulation layer materials prepared in Examples 1-3 above was tested, and the test results are shown in the table above. Among them, the thermal conductivity was determined according to GB / T10295-2008;

[0057] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A box insulation layer integral foam material, characterized in that: The raw materials of the integral foaming material of the box insulation layer include: base resin: 50-80 parts, filler: 20-40 parts, foaming agent: 3-5 parts, catalyst: 1-2 parts, cross-linking agent: 1-2 parts, surfactant: 0.5-1 part, and release agent: appropriate amount.

2. The integral foam material for the box insulation layer according to claim 1, characterized in that: The matrix resin is polyurethane or polyethylene.

3. The integral foam material for the box insulation layer according to claim 1, characterized in that: The filler is glass fiber or aluminum silicate fiber.

4. The integral foam material for the box insulation layer according to claim 1, characterized in that: The foaming agent is HCFC-141b or HFC-245fa.

5. The integral foam material for the box insulation layer according to claim 1, characterized in that: The catalyst is an organic tin compound or a derivative thereof.

6. The integral foam material for the box insulation layer according to claim 1, characterized in that: The cross-linking agent is a polyol.

7. A method for preparing an integral foam material for a box insulation layer, characterized in that: The following steps are involved: S1. Mix the base resin, filler, foaming agent, catalyst, cross-linking agent and surfactant in the above proportions and stir evenly; S2. Pour the mixed material into a mold and place it in a preheated foaming box for foaming; S3. Control the foaming temperature and pressure to allow the foaming agent to fully expand and evenly distribute in the material; S4, after the foaming is completed, the foamed insulation layer is taken out, cooled and solidified; S5. Perform post-processing such as cutting, grinding, and spraying on the insulation layer as needed.

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