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Polyurethane gasket and method of forming same

一种聚氨酯、垫片的技术，应用在化学仪器和方法、其他化学过程、机械设备等方向，能够解决困难、严格控制困难、显著投资成本等问题

Active Publication Date: 2016-08-24
SAINT GOBAIN PERFORMANCE PLASTICS CHAINEUX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As such, two-component systems have disadvantages including difficulties associated with strict control of the stoichiometric mixing of the components and with cleaning lines and cleaning equipment used to prevent the polyurethane from curing in a dispensing system
Additionally, high humidity chamber equipment represents a significant investment cost

Method used

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  • Polyurethane gasket and method of forming same
  • Polyurethane gasket and method of forming same
  • Polyurethane gasket and method of forming same

Examples

Experimental program
Comparison scheme
Effect test

example

[0056] Each of the following examples was prepared using foam derived from a one component polyurethane. The one-component polyurethane is formed from a mixture of 60wt% and 70wt% polyether polyol, including 2 / 3 of a trifunctional polyether polyol with 28mg KOH / g hydroxyl number and 1 / 3 of A trifunctional SAN grafted polyether polyol with 20 mg KOH / g hydroxyl number available from Elastogran (BASF). Furthermore, the one-component polyurethane is formed from a mixture of isocyanates in an amount of 25% to 35% by weight. The mixture comprises 79 wt% of a modified 4,4'-diphenylmethane diisocyanate having an NCO% of about 11.7 and a functionality of 2.2-2.3, and 21 wt% of a NCO% of about 23 and a functionality of 2.05 A modified 4,4'-diphenylmethane diisocyanate of functionality available from Elastogran (BASF). In addition, the one-component polyurethane includes the catalyst bis-(2-(4-morpholinyl-) ethyl ether in the indicated amount. Additionally, the one-component polyuretha...

example 1

[0060] Sample formulations were prepared with catalyst in amounts of 0.27 wt%, 0.68 wt%, 1.01 wt%, and 1.35 wt%, respectively. These samples were cured under three conditions: (A) 15°C and 52% RH, (B) 23°C and 50% RH, and (C) 55°C and 85% RH. Table 1 shows tack-free and complete cure times for samples cured under the indicated conditions.

[0061] Table 1

[0062]

[0063] As shown in Table 1, the samples containing at least 0.68 wt% catalyst exhibited a tack free cure time of no greater than 15 minutes and a full cure time of no greater than 20 minutes when cured at 23°C and 50% RH. In particular, samples containing at least 1.35 wt% catalyst exhibited tack-free cure times and full cure times of less than 20 minutes under each condition.

example 2

[0065] Sample formulations were prepared at a catalyst level of 1.35 wt%. The samples were cured at 23°C and 50% RH with or without externally applied water. Table 2 presents the hardness measured at various time points for samples cured under the indicated conditions. The samples were considered tack-free when the hardness was at least 32.

[0066] Table 2.

[0067] time (min)

[0068]

[0069] As shown in Table 2, the samples cured in the presence of externally applied water were fully cured within 15 minutes, while the samples cured without externally applied water were fully cured after 20 minutes.

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Abstract

A method of forming a seal comprises: preparing a foam from a one-part polyurethane precursor, applying the foam to a surface of an article, and applying water simultaneously with the foam, the foam curing to form a Gaskets glued to the article with a density greater than 350 kg / m3.

Description

[0001] This application is a divisional application of the application dated July 23, 2010, the application number is 201080032823.2, and the invention name is "polyurethane gasket and its forming method". technical field [0002] The present disclosure generally relates to polyurethane gaskets and methods for forming such polyurethane gaskets. Background technique [0003] Polyurethane foams have been used to form seals and gaskets in various industries, such as the automotive industry, appliance industry, aerospace industry, and electronics industry. Polyurethane foam can be formed into gaskets by different techniques, such as foam-in-place, molding, or transfer molding. In addition, polyurethane can be used in a variety of densities ranging from high density to low density. [0004] Specifically, polyurethane can be formed using a two-component system or a one-component system. In a conventional two-component system, a polyol component is mixed with a diisocyanate compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/12
CPCB29C44/1271C08G18/12C08G18/2081C08G18/4072C08G18/632C08G2190/00C08J9/30C08J2375/04C08G2110/0066C08G2110/0083C08G2110/0008C08G18/302C09K3/10F16J15/10
Inventor A·科姆特G·莫伊奈奥D·曼弗雷迪
Owner SAINT GOBAIN PERFORMANCE PLASTICS CHAINEUX
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