CN-121988695-A - Mold release agent for casting core shooting riser and preparation method thereof

CN121988695ACN 121988695 ACN121988695 ACN 121988695ACN-121988695-A

Abstract

The invention relates to the technical field of casting auxiliary materials, and provides a release agent for a casting core shooting riser and a preparation method thereof, comprising the following steps of S1, respectively preparing alkyl modified polysiloxane and amino modified organosilicon, wherein the alkyl modified polysiloxane comprises hydrogen polysiloxane, alpha-olefin and a first catalyst, and the amino modified organosilicon comprises cyclosiloxane, an aminosilane coupling agent and a second catalyst; S2, evenly mixing alkyl modified polysiloxane, amino modified organosilicon and an oily carrier, adding a surfactant, stirring and evenly mixing to obtain the release agent for casting core shooting riser, and evenly mixing the double modified components, the oily carrier and the surfactant according to a specific sequence to construct a full oily system, so that the technical effects of stabilizing and solidifying the cold core resin and protecting the mold from abrasion are achieved.

Inventors

LI GANG
ZHENG JINPENG
SUN ZHIYONG
WANG LAIMING
XU CHUANJIAN
LUO HAIYUAN
SUN ZHILAN
PAN YUEBAO
LIU MENG
LUO XIAO

Assignees

潍坊舜得新材料有限公司

Dates

Publication Date: 20260508
Application Date: 20260319

Claims (9)

1. The preparation method of the release agent for the casting core shooting riser is characterized by comprising the following steps of: S1, respectively preparing alkyl modified polysiloxane and amino modified organosilicon, wherein the alkyl modified polysiloxane comprises hydrogen polysiloxane, alpha-olefin and a first catalyst, and the amino modified organosilicon comprises cyclosiloxane, an aminosilane coupling agent and a second catalyst; s2, mixing the alkyl modified polysiloxane, the amino modified organosilicon and the oily carrier uniformly, adding the surfactant, and stirring and mixing uniformly to obtain the release agent for the casting core shooting riser.
2. The method for producing a mold release agent for casting core risers as defined in claim 1, wherein the method for producing alkyl-modified polysiloxane in step S1 comprises: Mixing hydrogen-containing polysiloxane and alpha-olefin, adding a first catalyst under the protection of gas, reacting for 4-6 hours at 80-120 ℃, reducing the temperature to 60-90 ℃ for hydrogenation treatment, and distilling under reduced pressure to obtain alkyl modified polysiloxane.
3. The method for producing a mold release agent for casting core risers according to claim 2, wherein the mass ratio of the hydrogen-containing polysiloxane to the alpha-olefin is 1 (0.32-0.45), the alpha-olefin comprises at least one of hexene, heptene, octene, nonene or decene, the hydrogen-containing polysiloxane comprises hydrogen-containing polydimethylsiloxane or hydrogen-containing polymethylphenylsiloxane, the first catalyst comprises a platinum-based catalyst, and the amount of the first catalyst is 0.01-0.03% of the total mass of the hydrogen-containing polysiloxane and the alpha-olefin.
4. The method for producing a mold release agent for casting core risers as defined in claim 1, wherein the step S1 of producing the amino-modified silicone comprises: Mixing cyclosiloxane with an aminosilane coupling agent, adding a second catalyst, heating to 90-120 ℃ for pre-polymerization for 4-6 hours, dehydrating, cooling to 45-55 ℃, reacting for 2-3 hours while maintaining the temperature, and heating to 110-120 ℃ for reacting for 6-8 hours to obtain the amino modified organosilicon.
5. The method of producing a mold release agent for casting core-shooting riser as claimed in claim 4, wherein the molar ratio of the cyclosiloxane to the aminosilane coupling agent is 1:0.15-0.2, the cyclosiloxane comprises at least one of octamethyl cyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethyl cyclopentasiloxane, the aminosilane coupling agent comprises at least one of N- (β -aminoethyl) - γ -aminopropyl methyldimethoxysilane, N- (β -aminoethyl) - γ -aminopropyl trimethoxysilane, N- (β -aminoethyl) - γ -aminopropyl triethoxysilane, the second catalyst comprises at least one of tetramethylammonium hydroxide, potassium hydroxide, sodium hydroxide, potassium silanol, and the second catalyst is added in an amount of 0.05-0.1% of the total mass of the cyclosiloxane and the aminosilane coupling agent.
6. The method of producing a mold release agent for casting core risers as defined in claim 1, wherein step S2 comprises: S2.1, stirring alkyl modified polysiloxane and amino modified polysiloxane for 10-15min, adding an oily carrier, continuously stirring for 5-10min, and finally adding a surfactant, and stirring for 3-5min; S2.2, after adding the surfactant, aging for 1-3 hours at 20-30 ℃ and stirring for 1 time every 30 minutes in the aging process.
7. The method for producing a mold release agent for casting a core riser as claimed in claim 6, wherein the stirring is performed mechanically at a stirring rate of 300 to 500r/min.
8. A mold release agent for casting core risers, which is prepared by the preparation method of the mold release agent for casting core risers according to any one of claims 1 to 7, and comprises the following components of alkyl modified polysiloxane, amino modified organosilicon, surfactant and oily carrier.
9. The mold release agent for a cast core riser of claim 8, wherein the surfactant comprises a fluorocarbon surfactant and the oily carrier comprises engine oil.

Description

Mold release agent for casting core shooting riser and preparation method thereof Technical Field The invention relates to the technical field of casting auxiliary materials, in particular to a release agent for casting core shooting riser and a preparation method thereof. Background The riser for casting is used as a key component for compensating the casting, and the molding process mainly comprises two main types of slurry adsorption molding and core shooting blow molding. The core shooting process has the advantages of high molding efficiency and good product consistency, and is widely applied to the scenes such as cold box resin core shooting, hot core shooting, sodium silicate sand core shooting and the like. The riser of the cold core injection type realizes the heating and heat preservation functions, the raw material system is obviously different from the conventional core injection product, the traditional silica sand is not contained, aluminum powder and floating beads are used as main components, auxiliary components such as potassium nitrate, manganese dioxide and mullite sand are matched, the addition amount of the resin of the cold core box reaches 8-12%, and the resin ratio (not more than 2.0%) of the resin of the conventional sand core casting process is far exceeded. The riser is molded by adopting an aluminum die for one-die multi-cavity (10-36) molding, the demolding area is large, the upward demolding stroke is long, and the demolding effect and the product quality are ensured by spraying a demolding agent. The conventional mould release agent for core shooting process mostly follows a raw material system of silica sand and low resin content, and is not completely suitable for cold core mould shooting type riser heads, because of the problems of adhesion and resin failure caused by raw material characteristics, tiny particles are easy to generate due to friction of an oxide layer on the surface of aluminum powder, the riser heads are adhered to the aluminum mould, the saturated water absorption rate of floating beads is low, polyisocyanate which is a core component of the cold core box resin is quickly decomposed when meeting water or alcohol, the resin is directly solidified and fails, and in addition, the friction of the aluminum mould and the aluminum component in riser head powder is easy to cause mould abrasion, so that the mould release success rate is low and the surface defects of a finished product are many. At present, no special release agent for cold core injection type riser is formed in the industry, and two solutions are generally adopted, namely, the release agent directly adopts the conventional casting sand core or precoated sand process, the component design of the release agent does not consider the characteristics of aluminum powder and floating beads and the influence of high resin content, the suitability is extremely poor, and the spraying frequency is increased to make up the defect of the function, but the mode not only increases the production process and the cost, but also easily causes the accumulation of the release agent, influences the riser forming precision, and aggravates the die abrasion, can not fundamentally solve the core problems of adhesion, resin failure and the like, and seriously restricts the industrial production efficiency and the product qualification rate of the cold core injection type riser. Accordingly, the prior art related to a mold release agent for casting core risers has yet to be further improved. Disclosure of Invention In view of the above, the invention provides a release agent for a casting core-shooting riser and a preparation method thereof, and solves the technical problems of low release efficiency and easy adhesion of the existing release agent for the casting core-shooting riser, which causes abrasion of a die. The technical scheme of the invention is realized as follows: the invention provides a preparation method of a release agent for casting core shooting riser, which comprises the following steps: S1, respectively preparing alkyl modified polysiloxane and amino modified organosilicon, wherein the alkyl modified polysiloxane comprises hydrogen polysiloxane, alpha-olefin and a first catalyst, and the amino modified organosilicon comprises cyclosiloxane, an aminosilane coupling agent and a second catalyst; s2, mixing the alkyl modified polysiloxane, the amino modified organosilicon and the oily carrier uniformly, adding the surfactant, and stirring and mixing uniformly to obtain the release agent for the casting core shooting riser. On the basis of the present technical solution, it is further preferred that the preparation method of the alkyl-modified polysiloxane in step S1 includes: Mixing hydrogen-containing polysiloxane and alpha-olefin, adding a first catalyst under the protection of gas, reacting for 4-6 hours at 80-120 ℃, reducing the temperature to 60-90 ℃ for hydrogenation treatment, and distilling under red