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Method for improving filling property of rigid polyurethane foam plastics

A technology of rigid polyurethane and foamed plastics, which is used in household refrigeration devices, lighting and heating equipment, and other household appliances, etc., can solve the problems of poor filling and low flow properties of rigid polyurethane foaming plastics, and reduce the filling amount. , Solve the effect of low flow performance and improve filling performance

Inactive Publication Date: 2009-07-08
HONGBAOLI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] What the present invention aims to solve is the problem of low fluidity and poor filling performance of existing rigid polyurethane foamed plastics in the foam molding process

Method used

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  • Method for improving filling property of rigid polyurethane foam plastics
  • Method for improving filling property of rigid polyurethane foam plastics
  • Method for improving filling property of rigid polyurethane foam plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Mix the above-mentioned POL-1: 100 parts, HCFC-141b: 22 parts, and mix with 44V-20L (isocyanate) at the tip of the gun to foam. The measured fiber time is: 55 seconds, and the free rise density is: 24.5kg / m 3 . Foaming in a mold of the same size according to this formula, (mold size: 1900×700×65), using Picture 1-1 The air-entraining method controls the gauge pressure of the foaming cavity and observes the foaming situation. See Table 2 below.

[0079] Table 2

[0080] Numbering P-1 P-2 P-3 P-4 P-5 P-6 P-7 Injection time, seconds 6.12 6.12 6.12 5.5 5.3 5.1 4.83 gauge pressure (MPa),

max

min

0.065

0

0.05

0

0.03

0

0.02

0

0.01

0

0

0

0

-0.019

Filling

from mold

top 17cm,

9% did not

full from mold top

2.2cm, yes

1.2% uncharged

Full

Overfill

1.5%

exactly charge

...

Embodiment 2

[0084] Mix the above POL-5: 100 parts, cyclopentane: 18.5 parts, and foam with 44V-20L. The fiber time is 15 seconds, and the free rise density is 22.8kg / m 3 . Mix the above POL-8: 100 parts, cyclopentane: 18.5 parts, and foam with 44V-20L. The fiber time is 55 seconds, and the free rise density is 23.5kg / m 3 . Use the above formula to foam in a mold of the same size, (mold size: 1850×700×65), using Figure 1-2 The air-entraining method controls the gauge pressure of the foaming cavity and observes the foaming situation.

[0085] table 3

[0086] P-8 P-9 P-10 P-11 P-12 P-13 Injection time, seconds 3.95 4.54 3.80 4.37 4.54 4.60 gauge pressure (MPa),

max

min

0

0

0

0

0

-0.02

0

-0.02

0.07

0

0

0

Filling

Just fill

15% overfill

exactly charge

fill

15% over

filling from mold top

22cm, yes

11.5% unc...

Embodiment 3

[0091] Take 100 parts of each of the above POL-2, POL-3, POL-4, POL-6, and POL-7, add different foaming agents, react with isocyanate, control the fiber time to 20-23 seconds, and press this The formulation is foamed in a mold of the same size, (mold size: 1850×700×65), using Picture 1-1 The air-entraining method controls the gauge pressure of the foaming cavity and observes the foaming situation.

[0092] Table 4

[0093] P-14 P-15 P-16 P-17 P-18 P-19 POL-2 100 POL-3 100 POL-4 100 POL-6 100 POL-7 100 100 HFC-365mfc 26 26 Cyclopentane / Isopentane

(7:3)

15

15

HFC-245fa 22 22 44V-20L 133 133 133 133 133 133 GT, seconds 30 32 28 26 18 18 Gauge pressure (MPa)

Max

Min

0.008

0

0

-0.02

0.02

0

0

-0.016

0

0 ...

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Abstract

The present invention relates to a method for improving filling property of hard polyurethane foamed plastic. The invention is characterized in that an air induction device is adopted for controlling the inner pressure of cavity of hard polyurethane foamed plastic in the foaming process. The gas which affects the flow of reaction solution is leaded out to cause that the reaction solution easily flows in the whole foaming reaction process. The invention can continuously lead out the gas which affects the generation of reaction solution so that the reaction solution easily flows in the whole reaction process. The problems of low flow property and inferior filling property in the prior forming process of polyurethane are essentially settled. The filling property in the foaming forming process is greatly improved. The filling amount of hard polyurethane foam prepared according to the invention is reduced by 5-20% at the state that the performance is guaranteed compared with the state that the invention is not adopted. The invention can be actualized with the existing foam production device which is little reformed.

Description

technical field [0001] The invention relates to the field of rigid polyurethane foam plastics, in particular to a method for improving the filling performance of rigid polyurethane foam plastics, by using an air-entraining device to control the internal pressure of the cavity to be filled with rigid polyurethane foam plastics, and The gas that affects the flow of the reaction liquid is drawn out, so that the reaction liquid can flow easily during the entire foaming reaction process, and the filling performance of rigid polyurethane foam is improved. Background technique [0002] Rigid polyurethane foam (polyurethane rigid foam for short) is usually formed by the reaction of polymerized isocyanate and polyol composition components in the presence of a blowing agent, and is usually used as a thermal insulation material for refrigerators, freezers, cold storage and pipelines . There are many molding processes for rigid polyurethane foam, the most commonly used is the molded fo...

Claims

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Application Information

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IPC IPC(8): B29C44/34B29C44/60C08J9/12C08G18/72C08G18/48C08G18/42B29C44/18F25D23/06B29K75/00
CPCB29K2075/00B29L2031/7622B29C44/3403B29C44/588B29C44/18
Inventor 芮敬功邢益辉姚志洪
Owner HONGBAOLI GRP CO LTD
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