阅读说明：本技术 一种低成本环保型聚氨酯发泡料及其发泡工艺 (Low-cost environment-friendly polyurethane foaming material and foaming process thereof ) 是由 刘鹏 吴园 江峰 于 2020-12-14 设计创作，主要内容包括：本发明公开了一种低成本环保型聚氨酯发泡料及其发泡工艺,涉及冰箱生产技术领域。本发明的低成本环保型聚氨酯发泡料包括由以下重量份的原料制成；白料为100份；环戊烷发泡剂为11-15份；发泡助剂为0.8-1.2份；黑料为135-145份。本发明制得的聚氨酯泡沫保温层相比于现有技术,具有更好的保温性能,同时生产成本更低,能够有效提高了产品竞争力,具有较高的市场应用价值。(The invention discloses a low-cost environment-friendly polyurethane foaming material and a foaming process thereof, and relates to the technical field of refrigerator production. The low-cost environment-friendly polyurethane foaming material is prepared from the following raw materials in parts by weight; the white material accounts for 100 parts; 11-15 parts of cyclopentane foaming agent; 0.8-1.2 parts of foaming auxiliary agent; the black material is 135-145 portions. Compared with the prior art, the polyurethane foam heat-insulating layer prepared by the invention has better heat-insulating property and lower production cost, can effectively improve the product competitiveness, and has higher market application value.)

1. The low-cost environment-friendly polyurethane foaming material is characterized by comprising the following raw materials in parts by weight;

2. the low-cost environment-friendly polyurethane foam material as claimed in claim 1, wherein the white material comprises polyether polyol, water, a catalyst and a stabilizer.

3. The low-cost environment-friendly polyurethane foam material as claimed in claim 1, wherein the foaming auxiliary agent is perfluoroolefin compound C5-18.

4. The low-cost environment-friendly polyurethane foam material as claimed in claim 1, wherein the black material is isocyanate (PAPI) with viscosity of 300-400(25 ℃) to mPa-s and isocyanate content of 30-32%.

5. A foaming process of a low-cost environment-friendly polyurethane foaming material is characterized by comprising the following steps:

step one, mixing a white material, a foaming auxiliary agent and a cyclopentane foaming agent in a white material premixing tank according to a ratio at the material temperature of 18-20 ℃ to obtain a mixed white material;

step two, under the condition that the material temperature is 18-20 ℃, putting the black material into a black material premixing tank and uniformly stirring to obtain the black material;

step three, simultaneously injecting the mixed white material and the mixed black material into an inner cavity of a material injection gun head, and injecting the mixture into a mold of a box body to be foamed through a gun head nozzle after the mixture is fully mixed;

and step four, curing the foaming raw materials in a mould for a period of time, and then demoulding to form the hard polyurethane foam heat-insulating layer in the mould.

Technical Field

The invention belongs to the technical field of refrigerator production, and particularly relates to a low-cost environment-friendly polyurethane foaming material and a foaming process thereof.

Background

With the development of technology, environmental protection is gradually paid attention to, and household electrical appliances such as refrigerators and freezers are also developed towards green environmental protection. At present, HFC-245fa foaming agent is forbidden in areas such as the United states and the like, polyurethane foaming systems of LBA foaming agent (the chemical name is HCFO-1233zd) are adopted by first-line refrigerator and freezer brands in China to produce export products, and because the cost of the LBA foaming agent is higher, the cost of the export products rises along with the rise, and detailed comparison is shown in the following table:

	245fa foam system	LBA foaming System	Price
				Mass ratio of white material	100	100	13.5 yuan/kg
245fa mass ratio	4	/	50 yuan/kg
				LBA quality ratio	/	4	80 yuan/kg
Mass ratio of cyclopentane	12	12	12 yuan/kg
				Mass ratio of black material	139.2	139.2	15 yuan/kg
Foam coefficient of thermal conductivity (K value)	18.9mw/mk	18.9mw/mk
				Average compressive strength	≥120KPa	≥120KPa
Average price	14.82 yuan/kg	15.29 yuan/kg
				Average perfusion volume	6kg	6kg
Average individual refrigerator cost	88.92 yuan	91.74 yuan

Note: the average price calculation formula is: Σ (mass to price)/∑ mass ratio.

Wherein the prices of the white material and the black material have certain fluctuation, the average cost of each refrigerator is increased by 2.8 yuan according to the average price of half a year in 2020; and the output of the refrigerator and freezer of the first-line brand in China is about 500 ten thousand pieces/year, and the annual cost increment is 1400 ten thousand yuan. Therefore, a low-cost environment-friendly polyurethane foaming material and a foaming process thereof are needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a low-cost environment-friendly polyurethane foaming material and a foaming process thereof, and aims to solve the problems in the background art.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a low-cost environment-friendly polyurethane foaming material which is prepared from the following raw materials in parts by weight;

further, the white material comprises polyether polyol, water, a catalyst and a stabilizer.

Further, the foaming auxiliary agent is a perfluoroolefin compound C5-18.

Further, the black material is isocyanate (PAPI), the viscosity of the black material is 300-400(25 ℃)/mPa.s, and the content of isocyanate is 30-32%.

A foaming process of a low-cost environment-friendly polyurethane foaming material comprises the following steps:

step one, mixing a white material, a foaming auxiliary agent and a cyclopentane foaming agent in a white material premixing tank according to a ratio at the material temperature of 18-20 ℃ to obtain a mixed white material;

step two, under the condition that the material temperature is 18-20 ℃, putting the black material into a black material premixing tank and uniformly stirring to obtain the black material;

step three, simultaneously injecting the mixed white material and the mixed black material into an inner cavity of a material injection gun head, and injecting the mixture into a mold of a box body to be foamed through a gun head nozzle after the mixture is fully mixed;

and step four, curing the foaming raw materials in a mould for a period of time, and then demoulding to form the hard polyurethane foam heat-insulating layer in the mould.

The invention has the following beneficial effects:

compared with the prior art, the polyurethane foam heat-insulating layer prepared by the invention has better heat-insulating property and lower production cost, can effectively improve the product competitiveness, and has higher market application value.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a foaming process of the low-cost environment-friendly polyurethane foaming material of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention relates to a low-cost environment-friendly polyurethane foaming material which is prepared from the following raw materials in parts by weight;

wherein the white material comprises polyether polyol, water, a catalyst and a stabilizer.

Wherein the foaming auxiliary agent is a perfluoroolefin compound C5-18.

Wherein the black material is isocyanate (PAPI), the viscosity of the black material is 300-400(25 ℃)/mPa.s, and the content of the isocyanate is 30-32%.

As shown in figure 1, the foaming process of the low-cost environment-friendly polyurethane foaming material comprises the following steps:

step one, mixing a white material, a foaming auxiliary agent and a cyclopentane foaming agent in a white material premixing tank according to a ratio at the material temperature of 18-20 ℃ to obtain a mixed white material;

step two, under the condition that the material temperature is 18-20 ℃, putting the black material into a black material premixing tank and uniformly stirring to obtain the black material;

step three, simultaneously injecting the mixed white material and the mixed black material into an inner cavity of a material injection gun head, and injecting the mixture into a mold of a box body to be foamed through a gun head nozzle after the mixture is fully mixed;

and step four, curing the foaming raw materials in a mould for a period of time, and then demoulding to form the hard polyurethane foam heat-insulating layer in the mould.

The first embodiment is as follows:

a low-cost environment-friendly polyurethane foaming material comprises the following raw materials in parts by weight;

wherein the white material comprises polyether polyol, water, a catalyst and a stabilizer.

Wherein the foaming auxiliary agent is a perfluoroolefin compound C5-18.

Wherein the black material is isocyanate (PAPI), the viscosity of the black material is 300-400(25 ℃)/mPa.s, and the content of the isocyanate is 30-32%.

Comparative example:

the polyurethane foaming material in the prior art is prepared from the following raw materials in parts by weight:

wherein the white material comprises polyether polyol, water, a catalyst and a stabilizer.

Wherein the foaming auxiliary agent is LBA foaming agent with the chemical name of HCFO-1233zd and the purity of 99.6%, and is provided by Honeyville (China) Co.

Wherein the black material is isocyanate (PAPI), the viscosity of the black material is 300-400(25 ℃)/mPa.s, and the content of the isocyanate is 30-32%.

The polyurethane foam heat-insulating layer prepared by foaming the polyurethane foam material of the first specific embodiment and the polyurethane foam material of the comparative example are foamed according to the proportion to prepare the polyurethane foam heat-insulating layer, and the specific parameters and the performances of the polyurethane foam heat-insulating layer prepared by foaming the polyurethane foam material of the first specific embodiment and the polyurethane foam heat-insulating layer prepared by foaming the polyurethane foam material of the comparative example are compared as follows:

parameter(s)	Detailed description of the preferred embodiment	Comparative example
			Ratio of black to white	1.2:1	1.2:1
LBA number of copies	/	4
			MFT parts	1	/
Fraction of cyclopentane	14	12
			The temperature of the material was lower	19	19
Mold temperature C	45	45
			Fill factor alpha	1.6	1.6
Thermal conductivity coefficient of 10 ℃ mw/mk	18.7	18.9
			Compressive strength of foam KPa	125-180	125-185
The volume shrinkage is 24 hours at the temperature of-70 DEG C	0.42	0.41

As can be seen from the table above, the polyurethane foam heat-insulating layer prepared by the invention has better heat-insulating property, and has consistent compression strength and volume shrinkage, and the cost is lower, so that the polyurethane foam heat-insulating layer is very suitable for replacing the prior art.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.