Production process of high-performance polyurethane foaming material for refrigerator

Abstract

The invention discloses a refrigerator high-performance polyurethane foaming material production process, and particularly relates to the technical field of polyurethane foaming material production, which comprises the following steps: 1, preparing raw materials: selecting high-density polyester polyol and polyisocyanate as raw materials, and mixing the raw materials to prepare a polyurethane foaming material; meanwhile, preparing a catalyst, a foaming agent, a surfactant, a cross-linking agent, a stabilizer and a flame retardant; 2, cleaning the polyester polyol and the polyisocyanate, cleaning impurities and dust on the surfaces of the polyester polyol and the polyisocyanate, and then drying the cleaned polyester polyol and polyisocyanate to ensure that the surfaces of the polyester polyol and the polyisocyanate are dry. The prepared polyurethane foaming material has the advantage of high density, so that the prepared polyurethane foaming material is relatively high in durability and can be used for a long time, and the prepared polyurethane foaming material is relatively good in performance.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane foam material production, and more specifically to a production process of high-performance polyurethane foam material for refrigerators. Background Art

[0002] Polyurethane foam material, also known as polyurethane foam material, is a foam-like material formed by polyurethane material through a foaming process. It is mainly made of raw materials such as polyols and polyisocyanates through a series of chemical reactions, and various additives such as foaming agents, catalysts, cross-linking agents, etc. are added in this process to control the formation and performance of the foam. The polyurethane foam material produced by the existing polyurethane foam material production process has general durability when used in refrigerators and cannot be used for a long time, resulting in the poor performance of the polyurethane foam material produced by the existing polyurethane foam material production process.

[0003] Therefore, there is an urgent need for a production process of high-performance polyurethane foam material for refrigerators to solve the above problems. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a production process of a high-performance polyurethane foam material for refrigerators. The polyurethane foam material prepared by the present invention has the advantage of high density. Therefore, the polyurethane foam material prepared by the present invention has high durability and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has better performance, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a production process of a high-performance polyurethane foam material for refrigerators, comprising the following steps: Step 1: Prepare raw materials, select high-density polyester polyols and polyisocyanates as raw materials, and prepare high-quality catalysts, foaming agents, surfactants, cross-linking agents, stabilizers and flame retardants; Step 2: Clean the polyester polyol and polyisocyanate, remove impurities and dust on the surface of the polyester polyol and polyisocyanate, and then dry the cleaned polyester polyol and polyisocyanate to ensure that the surface of the polyester polyol and polyisocyanate is dry; Step 3: Add the cleaned and dried polyester polyol and polyisocyanate into a mixer, add a catalyst and a foaming agent at the same time, and then start the mixer to stir and make the materials react. Under the action of the catalyst, the polyether or polyester polyol and the polyisocyanate react chemically to form a polyurethane prepolymer. Then, the foaming agent decomposes and generates gas during the reaction, so that the prepolymer expands and foams. Step 4: Prepare the mold according to the given size, then polish the mold surface and apply a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, inject the mixed polyurethane liquid into the mold slowly to avoid excessive pressure changes, so as to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer; Step 5: The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35-40°C to promote the foaming reaction; Step 6: After the foaming is completed, the foaming material gradually solidifies in the mold. During the curing process, the stability and internal temperature of the mold must be maintained to ensure that the foaming material can be fully solidified and reach the ideal hardness and strength; Step 7: After the foaming material is completely cured, remove the finished product from the mold; Step 8: Trim the finished product, trim the excess foam material and tidy up the edges. The finished product has a flat, smooth surface and uniform thickness.

[0006] In a preferred embodiment, the stirring time in step three is 2-3 minutes.

[0007] In a preferred embodiment, the stirring speed in step three is 3500-3600 rpm.

[0008] In a preferred embodiment, the temperature during stirring in step 3 is controlled at 25-30°C.

[0009] In a preferred embodiment, in step 4, the temperature inside the mold is controlled at 35-45°C.

[0010] Technical effects and advantages of the present invention: The present invention first prepares raw materials, selects high-density polyester polyols and polyisocyanates as raw materials, and simultaneously prepares superior catalysts, foaming agents, surfactants, crosslinking agents, stabilizers and flame retardants, then cleans the polyester polyols and polyisocyanates, removes impurities and dust on the surfaces of the polyester polyols and polyisocyanates, and then dries the cleaned polyester polyols and polyisocyanates to ensure that the surfaces of the polyester polyols and polyisocyanates are dry, then adds the cleaned and dried polyester polyols and polyisocyanates into a mixer, and simultaneously adds a catalyst and a foaming agent, and then starts the mixer to stir, so that the materials undergo a mixed reaction, under the action of the catalyst, polyether or polyester polyol reacts chemically with the polyisocyanate to generate a polyurethane prepolymer, and then the foaming agent decomposes and generates gas during the reaction to expand and foam the prepolymer, prepares a mold according to a predetermined size, and then polishes and coats the mold surface with a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, The polyurethane liquid after the mixed reaction is injected into the mold slowly to avoid excessive pressure changes to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer. The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35°C to promote the foaming reaction. After the foaming is completed, the foaming material is gradually solidified in the mold. During the curing process, the stability and internal temperature of the mold need to be maintained to ensure that the foaming material can be fully solidified and reach the desired hardness and strength. After the foaming material is completely solidified, the finished product is taken out of the mold and trimmed. The excess foaming material is trimmed and the edges are arranged. The trimmed finished product has a flat, smooth surface and uniform thickness. The polyurethane foam material prepared by the present invention has the advantage of high density. Therefore, the polyurethane foam material prepared by the present invention has high durability and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has good performance. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0012] Example 1 The present invention provides a production process of a high-performance polyurethane foam material for refrigerators, comprising the following steps: Step 1: Prepare raw materials, select high-density polyester polyols and polyisocyanates as raw materials, and prepare high-quality catalysts, foaming agents, surfactants, cross-linking agents, stabilizers and flame retardants; Step 2: Clean the polyester polyol and polyisocyanate, remove impurities and dust on the surface of the polyester polyol and polyisocyanate, and then dry the cleaned polyester polyol and polyisocyanate to ensure that the surface of the polyester polyol and polyisocyanate is dry; Step 3: Add the cleaned and dried polyester polyol and polyisocyanate into a mixer, add a catalyst and a foaming agent at the same time, and then start the mixer to stir and make the materials react. Under the action of the catalyst, the polyether or polyester polyol and the polyisocyanate react chemically to form a polyurethane prepolymer. Then, the foaming agent decomposes and generates gas during the reaction, so that the prepolymer expands and foams. Step 4: Prepare the mold according to the given size, then polish the mold surface and apply a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, inject the mixed polyurethane liquid into the mold slowly to avoid excessive pressure changes, so as to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer; Step 5: The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35°C to promote the foaming reaction; Step 6: After the foaming is completed, the foaming material gradually solidifies in the mold. During the curing process, the stability and internal temperature of the mold must be maintained to ensure that the foaming material can be fully solidified and reach the ideal hardness and strength; Step 7: After the foaming material is completely cured, remove the finished product from the mold; Step 8: Trim the finished product, trim the excess foam material and tidy up the edges. The finished product has a flat, smooth surface and uniform thickness.

[0013] The stirring time in step 3 is 2 minutes.

[0014] The stirring speed in the step 3 is 3500 rpm.

[0015] The temperature during stirring in step 3 is controlled at 25°C.

[0016] In the step 4, the temperature inside the mold is controlled at 35°C.

[0017] The polyurethane foam material prepared in this embodiment has the advantage of higher density compared to the prior art. Therefore, the polyurethane foam material prepared in this embodiment is more durable than the prior art and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has better performance.

[0018] Example 2 The present invention provides a production process of a high-performance polyurethane foam material for refrigerators, comprising the following steps: Step 1: Prepare raw materials, select high-density polyester polyols and polyisocyanates as raw materials, and prepare high-quality catalysts, foaming agents, surfactants, cross-linking agents, stabilizers and flame retardants; Step 2: Clean the polyester polyol and polyisocyanate, remove impurities and dust on the surface of the polyester polyol and polyisocyanate, and then dry the cleaned polyester polyol and polyisocyanate to ensure that the surface of the polyester polyol and polyisocyanate is dry; Step 3: Add the cleaned and dried polyester polyol and polyisocyanate into a mixer, add a catalyst and a foaming agent at the same time, and then start the mixer to stir and make the materials react. Under the action of the catalyst, the polyether or polyester polyol and the polyisocyanate react chemically to form a polyurethane prepolymer. Then, the foaming agent decomposes and generates gas during the reaction, so that the prepolymer expands and foams. Step 4: Prepare the mold according to the given size, then polish the mold surface and apply a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, inject the mixed polyurethane liquid into the mold slowly to avoid excessive pressure changes, so as to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer; Step 5: The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35°C to promote the foaming reaction; Step 6: After the foaming is completed, the foaming material gradually solidifies in the mold. During the curing process, the stability and internal temperature of the mold must be maintained to ensure that the foaming material can be fully solidified and reach the ideal hardness and strength; Step 7: After the foaming material is completely cured, remove the finished product from the mold; Step 8: Trim the finished product, trim the excess foam material and tidy up the edges. The finished product has a flat, smooth surface and uniform thickness.

[0019] The stirring time in step 3 is 2.5 minutes.

[0020] The stirring speed in the step 3 is 3550 rpm.

[0021] The temperature during stirring in step 3 is controlled at 25°C.

[0022] In step 4, the temperature inside the mold is controlled at 40°C.

[0023] The polyurethane foam material prepared in this embodiment has the advantage of higher density compared to the prior art. Therefore, the polyurethane foam material prepared in this embodiment is more durable than the prior art and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has better performance.

[0024] Example 3 The present invention provides a production process of a high-performance polyurethane foam material for refrigerators, comprising the following steps: Step 1: Prepare raw materials, select high-density polyester polyols and polyisocyanates as raw materials, and prepare high-quality catalysts, foaming agents, surfactants, cross-linking agents, stabilizers and flame retardants; Step 2: Clean the polyester polyol and polyisocyanate, remove impurities and dust on the surface of the polyester polyol and polyisocyanate, and then dry the cleaned polyester polyol and polyisocyanate to ensure that the surface of the polyester polyol and polyisocyanate is dry; Step 3: Add the cleaned and dried polyester polyol and polyisocyanate into a mixer, add a catalyst and a foaming agent at the same time, and then start the mixer to stir and make the materials react. Under the action of the catalyst, the polyether or polyester polyol and the polyisocyanate react chemically to form a polyurethane prepolymer. Then, the foaming agent decomposes and generates gas during the reaction, so that the prepolymer expands and foams. Step 4: Prepare the mold according to the given size, then polish the mold surface and apply a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, inject the mixed polyurethane liquid into the mold slowly to avoid excessive pressure changes, so as to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer; Step 5: The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 40°C to promote the foaming reaction; Step 6: After the foaming is completed, the foaming material gradually solidifies in the mold. During the curing process, the stability and internal temperature of the mold must be maintained to ensure that the foaming material can be fully solidified and reach the ideal hardness and strength; Step 7: After the foaming material is completely cured, remove the finished product from the mold; Step 8: Trim the finished product, trim the excess foam material and tidy up the edges. The finished product has a flat, smooth surface and uniform thickness.

[0025] The stirring time in step 3 is 2.5 minutes.

[0026] The stirring speed in the step 3 is 3550 rpm.

[0027] The temperature during stirring in step 3 is controlled at 30°C.

[0028] In step 4, the temperature inside the mold is controlled at 40°C.

[0029] The polyurethane foam material prepared in this embodiment has the advantage of higher density compared to the prior art. Therefore, the polyurethane foam material prepared in this embodiment is more durable than the prior art and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has better performance.

[0030] Example 4 The present invention provides a production process of a high-performance polyurethane foam material for refrigerators, comprising the following steps: Step 1: Prepare raw materials, select high-density polyester polyols and polyisocyanates as raw materials, and prepare high-quality catalysts, foaming agents, surfactants, cross-linking agents, stabilizers and flame retardants; Step 2: Clean the polyester polyol and polyisocyanate, remove impurities and dust on the surface of the polyester polyol and polyisocyanate, and then dry the cleaned polyester polyol and polyisocyanate to ensure that the surface of the polyester polyol and polyisocyanate is dry; Step 3: Add the cleaned and dried polyester polyol and polyisocyanate into a mixer, add a catalyst and a foaming agent at the same time, and then start the mixer to stir and make the materials react. Under the action of the catalyst, the polyether or polyester polyol and the polyisocyanate react chemically to form a polyurethane prepolymer. Then, the foaming agent decomposes and generates gas during the reaction, so that the prepolymer expands and foams. Step 4: Prepare the mold according to the given size, then polish the mold surface and apply a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, inject the mixed polyurethane liquid into the mold slowly to avoid excessive pressure changes, so as to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer; Step 5: The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35-40°C to promote the foaming reaction; Step 6: After the foaming is completed, the foaming material gradually solidifies in the mold. During the curing process, the stability and internal temperature of the mold must be maintained to ensure that the foaming material can be fully solidified and reach the ideal hardness and strength; Step 7: After the foaming material is completely cured, remove the finished product from the mold; Step 8: Trim the finished product, trim the excess foam material and tidy up the edges. The finished product has a flat, smooth surface and uniform thickness.

[0031] The stirring time in step 3 is 3 minutes.

[0032] The stirring speed in the step 3 is 3600 rpm.

[0033] The temperature during stirring in step 3 is controlled at 30°C.

[0034] In step 4, the temperature inside the mold is controlled at 45°C.

[0035] The polyurethane foam material prepared in this embodiment has the advantage of higher density compared to the prior art. Therefore, the polyurethane foam material prepared in this embodiment is more durable than the prior art and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has better performance.

[0036] The present invention first prepares raw materials, selects high-density polyester polyols and polyisocyanates as raw materials, and simultaneously prepares superior catalysts, foaming agents, surfactants, crosslinking agents, stabilizers and flame retardants, then cleans the polyester polyols and polyisocyanates, removes impurities and dust on the surfaces of the polyester polyols and polyisocyanates, and then dries the cleaned polyester polyols and polyisocyanates to ensure that the surfaces of the polyester polyols and polyisocyanates are dry, then adds the cleaned and dried polyester polyols and polyisocyanates into a mixer, and simultaneously adds a catalyst and a foaming agent, and then starts the mixer to stir, so that the materials undergo a mixed reaction, under the action of the catalyst, polyether or polyester polyol reacts chemically with the polyisocyanate to generate a polyurethane prepolymer, and then the foaming agent decomposes and generates gas during the reaction to expand and foam the prepolymer, prepares a mold according to a predetermined size, and then polishes and coats the mold surface with a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, The polyurethane liquid after the mixed reaction is injected into the mold slowly to avoid excessive pressure changes to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer. The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35°C to promote the foaming reaction. After the foaming is completed, the foaming material is gradually solidified in the mold. During the curing process, the stability and internal temperature of the mold need to be maintained to ensure that the foaming material can be fully solidified and reach the desired hardness and strength. After the foaming material is completely solidified, the finished product is taken out of the mold and trimmed. The excess foaming material is trimmed and the edges are arranged. The trimmed finished product has a flat, smooth surface and uniform thickness. The polyurethane foam material prepared by the present invention has the advantage of high density. Therefore, the polyurethane foam material prepared by the present invention has high durability and can be used for a long time, so that the polyurethane foam material prepared in this embodiment has good performance.

[0037] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for high-performance polyurethane foam material for refrigerators, characterized in that: The following steps are involved: Step 1: Prepare raw materials, select high-density polyester polyols and polyisocyanates as raw materials, and prepare high-quality catalysts, foaming agents, surfactants, cross-linking agents, stabilizers and flame retardants; Step 2: Clean the polyester polyol and polyisocyanate, remove impurities and dust on the surface of the polyester polyol and polyisocyanate, and then dry the cleaned polyester polyol and polyisocyanate to ensure that the surface of the polyester polyol and polyisocyanate is dry; Step 3: Add the cleaned and dried polyester polyol and polyisocyanate into a mixer, add a catalyst and a foaming agent at the same time, and then start the mixer to stir and make the materials react. Under the action of the catalyst, the polyether or polyester polyol and the polyisocyanate react chemically to form a polyurethane prepolymer. Then, the foaming agent decomposes and generates gas during the reaction, so that the prepolymer expands and foams. Step 4: Prepare the mold according to the given size, then polish the mold surface and apply a mold release agent to ensure that the foaming material can be evenly coated and demolded smoothly, inject the mixed polyurethane liquid into the mold slowly to avoid excessive pressure changes, so as to ensure that the polyurethane liquid can fully fill the mold and form a uniform foaming layer; Step 5: The polyurethane liquid continues to undergo chemical reactions in the mold and expands and foams to form a foaming layer with thermal insulation properties. During the foaming process, the temperature in the mold is controlled at 35-40°C to promote the foaming reaction; Step 6: After the foaming is completed, the foaming material gradually solidifies in the mold. During the curing process, the stability and internal temperature of the mold must be maintained to ensure that the foaming material can be fully solidified and reach the ideal hardness and strength; Step 7: After the foaming material is completely cured, remove the finished product from the mold; Step 8: Trim the finished product, trim the excess foam material and tidy up the edges. The finished product has a flat, smooth surface and uniform thickness.

2. The production process of a high-performance polyurethane foam material for refrigerators according to claim 1, characterized in that: The stirring time in step 3 is 2-3 minutes.

3. The production process of a high-performance polyurethane foam material for refrigerator according to claim 1, characterized in that: The stirring speed in step 3 is 3500-3600 rpm.

4. The production process of a high-performance polyurethane foam material for refrigerators according to claim 1, characterized in that: The temperature during stirring in step 3 is controlled at 25-30°C.

5. The production process of a high-performance polyurethane foam material for refrigerators according to claim 1, characterized in that: In the step 4, the temperature inside the mold is controlled at 35-45°C.