CN-122008467-A - Insulation layer, foaming preparation method and preparation device thereof and refrigeration device

CN122008467ACN 122008467 ACN122008467 ACN 122008467ACN-122008467-A

Abstract

The application provides an insulating layer, a foaming preparation method, a foaming preparation device and a refrigerating device thereof, wherein the foaming preparation method comprises the steps of determining raw material parameters of the insulating layer according to the thickness of the insulating layer and the ambient temperature; the method comprises the steps of carrying out partition preheating on a die, wherein a first set temperature of a frame of the die is 60-65 ℃, a second set temperature of the top and the bottom of the die is 55-60 ℃, a third set temperature of a corner of the die is 65-70 ℃, injecting a raw material mixture prepared according to raw material parameters into the preheated die, and carrying out staged vacuumizing on the interior of the preheated die, wherein in an injection stage, the first vacuum degree in the die is-0.05 MPa to-0.03 MPa, in an expansion stage, the second vacuum degree in the die is-0.08 MPa to-0.06 MPa, in a curing stage, the third vacuum degree in the die is-0.05 MPa to-0.04 MPa, and demoulding to obtain the heat insulation layer.

Inventors

WANG HAICHAO
ZHOU SIJIAN
CAO ZHI
ZHANG SHIQIAN
LV JIAJIA

Assignees

TCL家用电器（合肥）有限公司

Dates

Publication Date: 20260512
Application Date: 20260226

Claims (10)

1. The foaming preparation method of the heat preservation layer is characterized by comprising the following steps of: Determining raw material parameters of the heat preservation layer according to the thickness of the heat preservation layer and the ambient temperature; Carrying out partition preheating on the die, wherein the first set temperature of the frame of the die is 60-65 ℃, the second set temperatures of the top and the bottom of the die are 55-60 ℃, and the third set temperature of the corner of the die is 65-70 ℃; Injecting the raw material mixture prepared according to the raw material parameters into a preheated mold, and vacuumizing the interior of the preheated mold in stages, wherein in the injection stage, the first vacuum degree in the mold is-0.05 MPa to-0.03 MPa, in the expansion stage, the second vacuum degree in the mold is-0.08 MPa to-0.06 MPa, and in the curing stage, the third vacuum degree in the mold is-0.05 MPa to-0.04 MPa; And demolding to obtain the heat preservation layer.
2. The foam production method according to claim 1, wherein in the process of performing the stage-wise vacuum evacuation of the preheated mold interior, the foam production method further comprises: acquiring a first real-time temperature of a frame of the die, a second real-time temperature of the top and the bottom of the die, and a third real-time temperature of a corner of the die; Adjusting the heating power of the heating device of the frame when the absolute value of the difference between the first real-time temperature and the first set temperature exceeds a first preset temperature value, and/or adjusting the heating power of the heating device of the top and bottom when the absolute value of the difference between the second real-time temperature and the second set temperature exceeds a second preset temperature value, and/or adjusting the heating power of the heating device of the corner when the absolute value of the difference between the third real-time temperature and the third set temperature exceeds a third preset temperature value; And/or before carrying out staged vacuum pumping on the interior of the preheated die, the foaming preparation method further comprises the following steps: Determining a first vacuum degree, a second vacuum degree and a third vacuum degree according to at least one of the first set temperature, the second set temperature and the third set temperature; and/or, in the process of carrying out staged vacuum pumping on the interior of the preheated die, the foaming preparation method further comprises the following steps: acquiring the real-time vacuum degree of the inside of the die; and adjusting the operation state of the vacuumizing module according to the real-time vacuum degree, wherein the vacuumizing module automatically decompresses when the real-time vacuum degree is lower than-0.085 MPa, and automatically supplements and vacuumizes when the real-time vacuum degree is higher than-0.02 MPa.
3. The foam production method according to claim 2, wherein the real-time vacuum is collected by a pressure sensor having a response time of not more than 0.5s.
4. The foam production method according to claim 1, wherein the mold is internally provided with a flow guide groove extending to the corner portion, and/or the vacuum degree of the corner portion is higher than the vacuum degree of the remaining area inside the mold by 0.005 to 0.01MPa, and/or, The virtual sphere radius of the corner is r, and the length of the shortest side of the die is L, wherein r/L is less than or equal to 1/6.
5. The foam production method according to claim 4, wherein the length of the flow guide groove is 5 to 8mm, and/or, The width of the diversion trench is 0.4-0.6mm, and/or, The depth of the diversion trench is 0.2-0.4mm, and/or Each corner is extended with at least two diversion trenches.
6. The foam production method according to claim 1, wherein the raw materials include a combined polyether, isocyanate, a foaming agent and a leveling agent; The determining raw material parameters of the heat preservation layer according to the thickness of the heat preservation layer and the environmental temperature comprises the following steps: determining the mass fraction of the foaming agent and/or the viscosity of the combined polyether according to the thickness of the heat-insulating layer, and/or, Determining the index of the isocyanate and/or the mass fraction of the leveling agent according to the ambient temperature; And/or the injection pressure of the raw material mixture into the preheated mold is 0.6-0.8MPa.
7. The foaming preparation device of heat preservation, characterized by comprising: The mold is provided with a cavity, wherein the cavity is used for forming the heat insulation layer; the determining module is used for determining raw material parameters of the heat preservation layer according to the thickness of the heat preservation layer and the ambient temperature; The heating module is used for preheating the die, wherein the first set temperature of the frame of the die is 60-65 ℃, the second set temperature of the top and the bottom of the die is 55-60 ℃, and the third set temperature of the corner of the die is 65-70 ℃; An injector for injecting the raw material mixture prepared according to the raw material parameters into a preheated mold; The vacuum pumping module is used for carrying out staged vacuum pumping on the inside of the preheated die, wherein the first vacuum degree in the die is-0.05 MPa to-0.03 MPa in the injection stage, the second vacuum degree in the die is-0.08 MPa to-0.06 MPa in the expansion stage, and the third vacuum degree in the die is-0.05 MPa to-0.04 MPa in the curing stage; And the demolding module is used for opening the cavity to obtain the heat preservation layer.
8. An insulation layer characterized by being produced by the foam production method according to any one of claims 1 to 6 or by the foam production apparatus according to claim 7.
9. The insulation of claim 8, wherein the insulation has a thickness of 15-20mm.
10. A refrigeration device comprising the insulation layer of claim 8 or 9.

Description

Insulation layer, foaming preparation method and preparation device thereof and refrigeration device Technical Field The application relates to the technical field of foaming, in particular to an insulating layer, a foaming preparation method and device thereof and a refrigerating device. Background The refrigerator is internally filled with a heat preservation layer. To meet the demands of users, ultra-thin refrigerators have been developed. The vacuum foaming technology is a mainstream technology of a heat insulation layer of a refrigerating device because the foam fluidity can be improved. The ultrathin refrigerator needs to use a small-thickness heat-insulating layer (less than or equal to 20 mm), but the small-thickness heat-insulating layer produced by the vacuum foaming technology in the prior art has the problem of poor quality. Disclosure of Invention In view of the above, the present application provides an insulation layer, a foaming preparation method, a preparation device and a refrigeration device thereof. In a first aspect, the present application provides a method for preparing a thermal insulation layer by foaming, including: Determining raw material parameters of the heat preservation layer according to the thickness of the heat preservation layer and the ambient temperature; Carrying out partition preheating on the die, wherein the first set temperature of the frame of the die is 60-65 ℃, the second set temperatures of the top and the bottom of the die are 55-60 ℃, and the third set temperature of the corner of the die is 65-70 ℃; Injecting the raw material mixture prepared according to the raw material parameters into a preheated mold, and vacuumizing the interior of the preheated mold in stages, wherein in the injection stage, the first vacuum degree in the mold is-0.05 MPa to-0.03 MPa, in the expansion stage, the second vacuum degree in the mold is-0.08 MPa to-0.06 MPa, and in the curing stage, the third vacuum degree in the mold is-0.05 MPa to-0.04 MPa; And demolding to obtain the heat preservation layer. Optionally, in the process of carrying out staged vacuum pumping on the preheated mold, the foaming preparation method further comprises the following steps: acquiring a first real-time temperature of a frame of the die, a second real-time temperature of the top and the bottom of the die, and a third real-time temperature of a corner of the die; Adjusting the heating power of the heating device of the frame when the absolute value of the difference between the first real-time temperature and the first set temperature exceeds a first preset temperature value, and/or adjusting the heating power of the heating device of the top and bottom when the absolute value of the difference between the third real-time temperature and the third set temperature exceeds a third preset temperature value, and/or adjusting the heating power of the heating device of the corner when the absolute value of the difference between the third real-time temperature and the third set temperature exceeds a third preset temperature value; And/or before carrying out staged vacuum pumping on the interior of the preheated die, the foaming preparation method further comprises the following steps: Determining a first vacuum degree, a second vacuum degree and a third vacuum degree according to at least one of the first set temperature, the second set temperature and the third set temperature; and/or, in the process of carrying out staged vacuum pumping on the interior of the preheated die, the foaming preparation method further comprises the following steps: acquiring the real-time vacuum degree of the inside of the die; the method comprises the steps of adjusting the running state of a vacuumizing module according to the real-time vacuum degree, wherein the vacuumizing module is used for vacuumizing the inside of the die, the vacuum module automatically decompresses when the real-time vacuum degree is lower than-0.085 MPa, and the vacuum module automatically supplements and pumps when the real-time vacuum degree is higher than-0.02 MPa. Optionally, the real-time vacuum is collected by a pressure sensor having a response time of no more than 0.5s. Optionally, a diversion trench is arranged in the die, and the diversion trench extends to the corner. Optionally, the virtual sphere radius of the corner is r, and the length of the shortest side of the die is L, wherein r/L is less than or equal to 1/6. Optionally, the extension length of the diversion trench is 5-8mm, and/or, The width of the diversion trench is 0.4-0.6mm, and/or, The depth of the diversion trench is 0.2-0.4mm, and/or, Each corner is extended with at least two diversion trenches. Optionally, the vacuum degree of the corner is 0.005-0.01MPa higher than the vacuum degree of the residual area inside the die. Optionally, the raw materials include a combination polyether, isocyanate, a foaming agent, and a leveling agent; The determining raw material parameters o