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Buoyancy module

A technology of buoyancy modules and composite foams, applied to other household appliances, drill pipes, drill pipes, etc.

Inactive Publication Date: 2018-02-23
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these properties are often inversely related, achieving both simultaneously can be a huge engineering challenge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] As indicated, in these examples amounts may be expressed in parts by weight or parts by volume. Abbreviations include: HGM = hollow glass microsphere, eq = equivalent weight, g = gram, hrs = hours, rpm = revolutions per minute, wt = weight, P = poise, and psi = pounds per square inch.

[0104] material list

[0105]

[0106] Preparation of HGM / powdered epoxy resin

[0107] Various grades of 3M HGM and uncured powdered epoxy resin were added to 8 oz. (237 ml) glass jars. The mixture was mixed for 1 minute using a Resodyne vibrating mixer set at 60% intensity and 60 Hz. Table 1 below shows a series of samples prepared and their theoretical densities calculated based on the density of powdered epoxy resin of 1.16 g / cc.

[0108] Table 1. Composition of the powder mix

[0109]

[0110] Curing of HGM / powdered epoxy powder

[0111] 2-4 grams of "HGM / Powdered Epoxy Powder" prepared above was added to a 1 inch (2.54 cm) diameter stainless steel mold. Place th...

Embodiment 1 and Embodiment 2

[0126] Example 1 and Example 2 were prepared by mixing HGM2 with powdered epoxy resin based on the amounts provided in Table 3 below. The amount of HGM was adjusted to 59% by volume to achieve a cured density of about 0.6 g / cc.

[0127] Table 3. Powdered Epoxy Resin-Based Formulations

[0128] components

parts by weight

Density(g / cc)

volume(%)

powdered epoxy resin

100

1.16

41

HGM 2

28.5

0.23

59

[0129] The two powder components were mixed for 1 minute at 53% intensity using a Resodyne acoustic mixer. The powder mixture was transferred to a cylindrical stainless steel mold and placed into a vacuum oven. A 15 psi (103 kPa) constant load pressure was placed on top of the mold and the samples were cured under vacuum at 160°C for 4 hours. The samples were removed from the mold after they had cooled to room temperature.

[0130] Comparative Example A and Comparative Example B are replicas and were used to obtain uniaxi...

Embodiment 3 to 14

[0134] Examples 3 to 5 were prepared using the same method used to prepare Example 1 and Example 2, except that the glass microsphere compositions provided in Table 5 below were used. The same table shows the hydrostatic pressure resistance from different glass bubbles as a function of syntactic foam density.

[0135] Table 5 Hydrostatic pressure resistance of various syntactic foams

[0136]

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Abstract

Buoyancy modules (200) are made from a foam composition that includes a combination of a thermally fusable powder and glass microspheres heated in a manner that provides a hardened syntactic foam having both low density and a high degree of compressive strength. An outer barrier (220) may enclose the buoyancy module.

Description

technical field [0001] A buoyancy module and a preparation method thereof are provided. More particularly, the provided buoyancy modules include subsea buoyancy modules comprising syntactic foam materials. Background technique [0002] Various subsea applications require the use of flexible pipelines, such as risers, manifolds and cables. In many cases, these conduits run between the subsea structure and the surface vessel or platform and enable communication between these bodies. In order to maintain the integrity of the pipeline and its associated structure, the pipeline generally needs to be kept in a relaxed and gently bent configuration. This enables a reasonable range of movement without placing the pipe under significant tension. [0003] The distributed buoyancy module provides the means to induce these subsea "wave" formations by applying uplift forces to selected sections of the pipeline. These modules generally have two main components: a floating unit and a f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44B29C70/66E21B17/01
CPCB29C70/44B29C70/66B29L2031/706E21B17/012B29K2063/00B29K2105/04B29K2105/251B29K2509/08
Inventor 吴永康西格蒙德·帕帕安德鲁·J·彼得森
Owner 3M INNOVATIVE PROPERTIES CO
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