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Soft polyurethane low-resilience foam and preparation thereof

A low-resilience and foam technology, applied in the field of aromatic isocyanate-based polyurethane low-resilience foam and its preparation, can solve the problem of expensive amine-terminated polypropylene oxide, difficulty in obtaining soft polyurethane low-resilience foam, and limited supply and other issues, to achieve the effect of a large range of formula components

Active Publication Date: 2009-04-22
薛攀霆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These amine-terminated polypropylene oxides are expensive and in limited supply
Difficulty obtaining useful amine-terminated polypropylene oxide molecules for flexible polyurethane low-resilience foams

Method used

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  • Soft polyurethane low-resilience foam and preparation thereof
  • Soft polyurethane low-resilience foam and preparation thereof
  • Soft polyurethane low-resilience foam and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8 and comparative Embodiment C1-C5

[0149] The flexible polyurethane low-resilience foams of Examples 1-8 and Comparative Examples C1-C5 were prepared by mixing the components shown in Table 2. Condition all selected ingredients in a temperature-controlled room at 23±1°C for at least 24 hours before foaming. The ingredients, except the organotin compound and isocyanate, were premixed together in a 1.5 liter stainless steel beaker for 40 seconds using a Cowles type mixer set at a rotation speed of 1,500 rpm prior to adding the organotin compound. After premixing, the organotin compound (if used) was then added to the cup and mixed for an additional 20 seconds with the rotation speed set at 1,500 rpm. The selected isocyanate compound was then added to the resulting mixture and mixed with the resulting composition at 3,000 rpm for 5 seconds. The mixture was then poured into a 45 cm (L) x 45 cm (W) x 45 cm (H) paper-lined wooden box with the top open and foamed. After the foam reached its final height, it was allo...

Embodiment 9-16

[0156] Examples 9-16 were prepared using the same procedure used in the preparation of Examples 1-8, except that the selected polyols P3 and P4 were first melted in an oven at a temperature of 60±1°C. When the polyol was completely melted, the polyol was then moved to a conditioning room at 28±1°C for 6 hours before further foaming. All other selected ingredients were conditioned for at least 24 hours in a separate chamber controlled at 23±1°C for at least 24 hours prior to foaming.

[0157] The selected polyol P3 or P4 was first mixed to the other polyols using a Cowles type high shear mixer at 3,000 rpm for 60 seconds. The flexible polyurethane low-resilience foams of Examples 7-12 were prepared by mixing the components shown in Table 3. The ingredients, except the organotin compound and isocyanate, were premixed together in a 1.5 liter stainless steel cup for 40 seconds using a Cowles type mixer set at a rotation speed of 2,000 rpm prior to adding the organotin compound. ...

Embodiment 13

[0163] In Example 13, a closed-cell foam was obtained, and when the internal temperature began to drop, the foam began to shrink. The foam is crushed by passing it twice through a pair of electric stainless steel roller breakers to prevent further shrinkage. The crushed foam was conditioned for at least 72 hours in a temperature controlled room at 23 ± 1 °C prior to further physical property testing. The physical properties described in Example 13 were determined using samples cut from crushed foam cores.

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Abstract

The invention relates to novel soft polyurethane foam with low elastic resilience. The soft polyurethane foam with low elastic resilience is a reaction product based on an isocyanate active ingredient and an isocyanate ingredient. The soft polyurethane foam with low elastic resilience is prepared by reaction of the following substances: (a) the isocyanate ingredient of aromatic isocyanate which does not contain isocyanate groups basically and is directly connected to aromatic rings; (b) an isocyanate active mixture; (c) a crosslinking agent; (d) catalyst; and (e) one substance or more substances of water, a surfactant and an additive. The isocyanate index of the soft polyurethane foam with low elastic resilience prepared by the method is between 75 and 105; the density is between 16 and 160 kilograms per cubic meter; and the rebound resilience of a falling sphere is lower than 15 percent.

Description

technical field [0001] The invention relates to an aromatic isocyanate-based polyurethane low-resilience foam whose aliphatic isocyanate and / or alicyclic isocyanate and / or isocyanate groups are not directly connected to an aromatic ring and a preparation method thereof. It also relates to reaction systems and specific isocyanate reactive component compositions that can be used in the process. Background technique [0002] Soft, low-resilience polyurethane foams are characterized by slow, gradual recovery after compression and are commonly referred to as "slow rebound" foams, "viscoelastic" foams, "dead" foams, "high damping" foams, "shape memory" foams, or "Slow Reply" bubble. While most of its physical properties are similar to conventional polyurethane foams, low resilience foams have much lower resilience, typically less than about 15%. [0003] Low resilience polyurethane foam has excellent impact resistance and excellent vibration damping. It also has shape adjustmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/28C08G18/08C08G101/00
CPCC08J2205/06C08G2101/0058C08G18/4854C08G2101/0083C08G18/4837C08G2101/0066C08G18/4866C08G18/3275C08G2110/0058C08G2110/0066C08G2110/0083
Inventor 杜宗宪
Owner 薛攀霆
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