Liner for gas storage tank

Patent metadata

Field	Value
Publication number	US-9470366-B2
Application number	US-201113991501-A
Country	US
Kind code	B2
Filing date	Dec 9, 2011
Priority date	Dec 9, 2010
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

This invention relates to a liner for a gas storage tank containing a polymer composition comprising: i. a polyamide A, and ii. a nucleating agent in an amount of at least 0.001 weight percent with respect to the total amount of the polymer composition, and iii. an impact modifier in an amount of at least 1 weight percent with respect to the total amount of the polymer composition. The invention also relates to a gas storage tank comprising a structural fiber composite comprising continuous carbon or glass fibers, as well as a method for preparing a liner by blow molding.

First claim

The invention claimed is:

1. A liner for a gas storage tank, the liner containing a polymer composition comprising:
i. a polyamide A,
ii. a nucleating agent in an amount of at least 0.001 wt % and at most 3 wt % with respect to the total amount of the polymer composition, and
iii. an impact modifier in an amount of at least 1 weight percent with respect to the total amount of the polymer composition.

2. The liner according to claim 1 , wherein the polyamide A is polyamide-6 (PA6), and wherein the nucleating agent is selected from the group consisting of polyamide-66 (PA66), polyamide-46 (PA46), polyamide-410 (PA410) and polyamide-4T (PA4T).

3. The liner according to claim 1 , wherein the polyamide A is polyamide-66 (PA66), and wherein the nucleating agent is selected from the group consisting of polyamide-46 (PA46) and polyamide-4T (PA4T).

4. The liner according to claim 1 , wherein the nucleating agent is micro talcum.

5. The liner according to claim 1 , wherein the nucleating agent is present in an amount of at least 0.05 wt % with respect to the total amount of polymer composition.

6. The liner according to claim 1 , wherein the nucleating agent is present in an amount between 0.05 wt % to 0.15 wt % with respect to the total amount of polymer composition.

7. The liner according claim 1 , wherein the amount of impact modifier is between 7 wt % and 20 wt % with respect to the total amount of polymer composition.

8. The liner according to claim 1 , wherein the impact modifier is a core-shell type impact modifier.

9. A gas storage tank comprising the liner of claim 1 and a structural fiber composite comprising continuous carbon or glass fibers.

10. The liner according to claim 1 , wherein the nucleating agent is selected from the group consisting of polyamides having a higher melting temperature than polyamide A and micro talcum.

11. The liner according to claim 10 , wherein the polyamides having a higher melting temperature than polyamide A are selected from the group consisting of polyamide-46 (PA46), polyamide-410 (PA410) and polyamide-4T (PA4T).

12. A method for preparing the liner according to claim 1 , comprising at least the following steps:
a. heating the polymer composition to obtain a homogeneous viscous liquid;
b. forming a parison from the viscous liquid;
c. expanding the parison by pressurized gas and pressing the expanded parison against a mold cavity until the parison cools and solidifies to form a part;
d. opening the mold; and
e. ejecting the part.

Assignees

• Dullaert Konraad
• Tomic Katarina
• Dsm Ip Assets Bv

Inventors

• Dullaert Konraad
• Tomic Katarina

Classifications

• F17C2221/014

  Nitrogen · CPC title

• F17C2221/035

  Propane butane, e.g. LPG, GPL · CPC title

• F17C2203/0675

  with details of composition · CPC title

• F17C2221/033

  Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG · CPC title

• F17C2221/011

  Oxygen · CPC title