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Mold release composition and process therewith

A technology of composition and solvent, which is applied in the field of release agent composition and its application, can solve the problems of not being able to obtain a continuous film, not being able to coat the surface well, etc.

Inactive Publication Date: 2006-06-28
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicone resins, commonly used as mold release agents, often do not coat surfaces well when dispersed in typical hydrocarbon solvents
Silicone resin lumps on the coated surface so no continuous film can be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] EXAMPLE 1 This example demonstrates that thinner continuous silicone resin coatings can be obtained with volatile methyl silicones than with petroleum ether.

[0025] The release agent composition comprising the following components is sprayed in the amount shown in the table below on a 1 inch × 3 inch (2.54cm × 7.62cm) microscope slide that has been weighed and heated to 65°C in advance: 80% solvent ( Petroleum ether or octamethylcyclotetrasiloxane (volatile methyl)), 20% silicone resin and fluid, and about 0.2% catalyst (based on the total weight of solvent, resin and fluid; TYZOR  TBT and dibutyltin diacetate). After allowing sufficient time for the solvent to evaporate in the fume hood, the release agent was cured at 65°C for 2 minutes. Slides were then reweighed and visually inspected under a microscope to estimate the silicone resin coverage of the slide surface. The results are shown in Table 1.

[0026] Coating weight (mg)

[0027] On glass slides ...

Embodiment 2

[0028] EXAMPLE 2 This example illustrates how various methyl silicone solvents can be used to promote smooth, continuous coatings of various silicone resins, fluids and functional fluids applied at elevated temperatures.

[0029] Silicone resins, fluids and functional fluids were dispersed in various hydrocarbon solvents and volatile methyl siloxanes at concentrations of 5% by weight polymer solids and 95% by weight solvent. Silicone polymers and solvents were sprayed with a Preval sprayer onto pre-weighed 1 inch by 3 inch (2.54 cm by 7.62 cm) microscope slides heated to 65°C. After the solvent evaporated, the glass slide was weighed to determine the coating weight and the smoothness and coverage of the coating were visually inspected, as shown in Table 2.

[0030] coating

coating

SP 1

solvent 2

weight

(mg)

appearance

coverage

SP 1

solvent 2

weight

...

Embodiment 3

[0034] EXAMPLE 3 This example illustrates how a volatile methylsiloxane solvent can be used to promote smooth, continuous coatings of room temperature coated silicone polymers.

[0035] One sample of silicone rubber was dispersed in petroleum ether, while a second sample of the same silicone rubber was dispersed in OMS fluid at a concentration of 5% by weight polymer solids and 95% by weight solvent. The silicone polymer and solvent were sprayed onto pre-weighed 1 inch by 3 inch (2.54 cm by 7.62 cm) room temperature microscope slides with a Preval sprayer. After the solvent evaporated, the glass slide was weighed to determine the coating weight and the smoothness and coverage of the coating were visually inspected. The results are shown in Table 3.

[0036] coating

coating

SP 1

solvent 2

weight

(mg)

appearance

coverage

SP 1

solvent 2

weight

(mg)

...

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PUM

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Abstract

A composition useful as a mold release agent is disclosed. The composition comprises a solvent; a silicone resin, rubber or fluid; and optionally a catalyst, a co-solvent or both, wherein the solvent is a volatile silicone. Also provided is a method of applying a thin continuous coating film on a mold. The method comprises combining a solvent, a silicone resin or a silicone rubber or a silicone fluid and, optionally, a catalyst, a co-solvent, or both, to form a release agent composition; combining said release agent coating on or onto a mold, and optionally curing the composition, wherein the solvent is a volatile silicone.

Description

field of invention [0001] The present invention relates to a composition which can be used as a release agent and a method of applying a thin continuous film of the release agent to a mold. Background of the invention [0002] In industrial operations, it is generally a release agent for polymers or combined polymers, and can be an emulsion or dispersion in a solvent. If dispersed in a solvent, the solvent is used as a medium to wet the surface of the shaped mold and the release agent is applied to the mold. However, silicone resins, which are commonly used as release agents, often do not coat surfaces well when dispersed in typical hydrocarbon solvents. The silicone resin lumped the coated surface so that a continuous film could not be obtained. [0003] Therefore, it is increasingly necessary to develop a new release agent that can form a thin continuous coating film on the surface of the mold. Summary of the invention ...

Claims

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Application Information

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IPC IPC(8): B29C33/60B29C33/64C08K5/54C08L83/04C09D183/04
CPCB29C33/64C08K5/54C09D183/04C08L83/04
Inventor R·H·莫菲特
Owner THE CHEMOURS CO FC LLC
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