Mould release agent, its preparation method and its purpose
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A release agent and solvent technology, used in additives, petroleum industry, lubricating compositions, etc., can solve the problems of increased demand for release agent, increased pressure, increased volatile organic compounds, etc., and achieves less release agent transfer and storage. Stable, easy-to-apply effect
Inactive Publication Date: 2012-08-01
HENKEL KGAA
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Problems solved by technology
Unfortunately, the use of sacrificial release agents creates many problems: 1) As the release agent is used repeatedly, it can build up on the mold surface to form deposits, which can obscure the detailed features of the mold, which can lead to The surface feature structure cannot be clearly copied on the surface of the polymer product, so as to destroy the integrity of the product surface
2) Due to the existence of fouling, the mold needs to be cleaned regularly, which leads to an increase in manpower and material resources and a reduction in production capacity; in addition, in the process of cleaning the mold, the mold will be damaged to varying degrees, thereby reducing the mold service life
3) Since the sacrificial release agent will be transferred to the surface of the polymer material product, it will affect the subsequent processing of the product
4) Since the sacrificial release agent needs to be reapplied to the mold surface before each product is manufactured, this greatly increases the demand for the release agent and also increases volatile organic compounds (VOC, such as solvents in the release agent) emissions, resulting in increased production costs and increased pressure on environmental protection
Therefore, the storage and use of the release agent are inconvenient
Method used
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preparation example Construction
[0043] The preparation of the polysiloxane with silicon-hydrogen bond is as follows: at least one silicone oil with silicon-hydrogen bond, at least one hydroxyl silicone resin and at least one dehydrogenation catalyst are dispersed in a solvent to form a dispersion, and the obtained The above dispersion is reacted, and then the solvent and catalyst are removed to obtain the desired polysiloxane having silicon-hydrogen bonds.
[0044] Wherein, the silicone oil with silicon-hydrogen bond includes the straight-chain silicone oil with silicon-hydrogen bond of the following formula (II),
[0045]
[0046] Wherein R is methyl or hydrogen, m>0, n≥0, the number of Si-H groups in each molecule is ≥3, and the hydrogen atom directly bonded to the silicon atom has a silicon-hydrogen bond relative to the The mass percentage of polysiloxane is 0.1-1.6%;
[0047] And / or the cyclic silicon-hydrogen bonded silicone oil comprising the following formula (III):
[0048]
[0049] Where x>0...
Embodiment 1
[0102] The formulation of the semi-permanent release agent is shown in Table 1.
[0103] According to the amount in Table 1, add polysiloxane with silicon-hydrogen bond to the dispersion tank with solvent, then add the catalyst under stirring at 100 rpm, and continue stirring at 100 rpm for 5 minutes at a temperature of 20°C , to obtain a semi-permanent release agent.
[0104] Table 1
[0105]
Embodiment 2
[0107] The formulation of the semi-permanent release agent is shown in Table 2.
[0108] According to the amount in Table 2, add the polysiloxane with silicon-hydrogen bond to the dispersing tank with solvent, then add the catalyst under stirring at 200 rpm, and continue stirring at 25°C for 6 minutes at the rotating speed of 200 rpm , to obtain a semi-permanent release agent.
[0109] Table 2
[0110]
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Abstract
The invention provides a mould release agent, which comprises the following component: Silicon hydrogen bond-possessing polysiloxane, a dehydrogenation condensation catalyst and a solvent. The mould release agent of the present invention is semi-permanent type mould release agent, and has the advantages of simple composition, rapid solidification at low temperature, less transference of the mould release agent, less wax accumulation, convenient application, low cost and the like. The mould release agent achieves great breakthrough in the polyurethane foamed product manufacturing field, the prepared product enables uniform perforate. The invention also provides a method for preparing the mould release agent, and a purpose of the mould release agent in production of polyurethane foamed products, epoxy resin products, glass fiber reinforcement epoxy resin products, rubber products, nonsaturated polyester products and other polyurethanes products.
Description
technical field [0001] The invention relates to a release agent, its preparation method and application. In particular, the present invention relates to mold release agents especially suitable for polyurethane foam articles, their preparation and use. Background technique [0002] In the manufacture of polymer material products, the molding method is generally used: the melt or solution material is injected into the mold, and after solidification and molding, the molded product is taken out from the mold. In order to help take out the product from the mold, a mold release agent is generally pre-coated on the mold, so that there is no bond between the product and the mold after cooling, thereby ensuring the quality of the product. Conventional mold release agents are mainly sacrificial mold release agents. The so-called sacrificial mold release agents are mold release agents that are consumed or completely exhausted in other ways after a single product is molded in a mold. ...
Claims
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