A one-time spraying and multiple-time demolding epoxy resin molding release agent and a preparation method thereof

Abstract

A release agent for epoxy resin molding that supports one-time spraying and multiple demolding, and its preparation method, relates to a release agent and its preparation method. The purpose of this invention is to solve the problem that traditional release agents in the prior art cannot achieve multiple demoldings after a single coating. The release agent for epoxy resin molding that supports one-time spraying and multiple demolding is prepared by mass fraction of 90%~95% solvent, 2%~10% film-forming agent, 2%~10% silicone resin, and 0.02%~2% co-catalyst. Method: 1. Mix the solvent, film-forming agent, and silicone resin to obtain a mixed solution; 2. Add the co-catalyst to the mixed solution and shake. This invention uses a solvent, film-forming agent, silicone resin, and co-catalyst to formulate a release agent that, after one coating or spraying on the surface of a stainless steel or fiberglass mold, enables multiple demoldings of epoxy resin molding, thereby improving production efficiency and saving production costs.

Description

Technical Field

[0001] This invention relates to a release agent and its preparation method. Background Technology

[0002] Epoxy resin-based composites are widely used in aerospace, automotive, and wind power industries due to their excellent mechanical properties, corrosion resistance, and designability. Demolding is a crucial step in the molding process of epoxy resin products. The demolding process directly affects the surface quality of the product and production efficiency. As a key additive ensuring smooth separation of the product from the mold, the performance of the release agent is critical to the molding process.

[0003] Currently, the release agents commonly used in epoxy resin molding processes are mostly traditional solvent-based or wax-based release agents. These types of release agents generally have a significant drawback: a single spray or coating can only complete the demolding of the epoxy resin product once. In mass production, after each product has cured and been demolded, the mold surface needs to be cleaned and the release agent reapplied before the next molding operation can be carried out.

[0004] Traditional mold release agents, which require "one-time application and one-time demolding," present numerous technical challenges. On one hand, repeated application of the release agent increases the number of steps in the process, significantly extending the overall production cycle and increasing labor and time costs. On the other hand, repeated application can lead to uneven release agent thickness on the mold surface, resulting in defects such as flow marks and insufficient adhesive on the product surface, thus reducing the product yield. For mass production of fiberglass and stainless steel molds, the requirement for frequent reapplication of release agents severely limits production efficiency and hinders further cost reductions. Therefore, there remains a pressing need within the industry for highly efficient mold release agents.

[0005] In view of the pain point that traditional release agents in the existing technology cannot achieve multiple demoldings after a single coating, there is an urgent need in the field to develop a new type of release agent that can meet the demolding requirements of multiple epoxy resin moldings after a single spray coating, thereby simplifying the production process, improving production efficiency, reducing production costs, and meeting the industrial needs of mass production of epoxy resin products. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that traditional release agents in the prior art cannot achieve multiple demoldings with a single coating, and to provide a release agent for epoxy resin molding that supports one-time spraying and multiple demoldings, as well as its preparation method.

[0007] An epoxy resin molding release agent that supports one-time spraying and multiple demolding is prepared by mass fraction of 90%~95% solvent, 2%~10% film-forming agent, 2%~10% organosilicon resin and 0.02%~2% co-catalyst.

[0008] A method for preparing an epoxy resin molding release agent that supports one-time spraying and multiple demolding is specifically carried out according to the following steps:

[0009] 1. Mix the solvent, film-forming agent and silicone resin, and stir until the silicone resin is completely dissolved in the solvent to obtain a mixed solution;

[0010] 2. Add the co-catalyst to the mixed solution, and then mix by shaking under sealed conditions to obtain an epoxy resin molding release agent that supports one-time spraying and multiple demolding.

[0011] The principle of this invention:

[0012] This invention utilizes low-molecular-weight, methoxy-terminated polydimethylsiloxane as a film-forming agent. This agent has low viscosity, excellent wetting and spreading properties, and rapidly forms a continuous, dense film layer on the mold surface after solvent evaporation. Then, it is further utilized...

[0013] The high cross-linking properties of methylphenyl silicone resin further cure to form a high-strength three-dimensional network structure, thereby giving the coating high hardness and adhesion, ultimately achieving one-time spraying and multiple demolding.

[0014] Advantages of this invention:

[0015] This invention uses a solvent, film-forming agent, organosilicon resin, and co-catalyst to formulate a release agent. After being coated or sprayed once on the surface of a stainless steel or fiberglass mold, it can complete multiple epoxy resin molding and demolding processes, thereby improving production efficiency and saving production costs. Attached Figure Description

[0016] Figure 1 The appearance of the sheet and the mold after six epoxy resin molding demoldings are shown in the figure. The epoxy resin molding release agent prepared in Example 1 was applied to the surface of the stainless steel mold once. Detailed Implementation

[0017] Specific Implementation Method 1: This implementation method is an epoxy resin molding release agent that supports one-time spraying and multiple demolding. It is prepared by mass fraction of 90%~95% solvent, 2%~10% film-forming agent, 2%~10% organosilicon resin and 0.02%~2% co-catalyst.

[0018] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the solvent mentioned in step one is isohexane or D40 solvent oil. The other steps are the same as in Specific Implementation Method One.

[0019] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One or Two in that the film-forming agent mentioned in step one is a methoxy-terminated polydimethylsiloxane. The other steps are the same as in Specific Implementation Method One or Two.

[0020] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the molecular weight of the methoxy-terminated polydimethylsiloxane is between 500 g / mol and 3000 g / mol, and the methoxy content in the structure is 20 to 30 wt%. Other steps are the same as in Specific Implementation Methods One to Three.

[0021] Specific Implementation Method Five: This implementation method differs from Specific Implementation Methods One to Four in that the organosilicon resin mentioned in step one is methylphenyl silicone resin. The other steps are the same as in Specific Implementation Methods One to Four.

[0022] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that the co-catalyst mentioned in step two is a mixture of triethylamine and tetrabutyl titanate. The other steps are the same as in Specific Implementation Methods One to Five.

[0023] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that the mass ratio of triethylamine to tetrabutyl titanate in the mixture of triethylamine and tetrabutyl titanate is 1:1. The other steps are the same as in Specific Implementation Methods One to Six.

[0024] Specific Implementation Method Eight: This implementation method is a preparation method for an epoxy resin molding release agent that supports one-time spraying and multiple demolding, specifically completed according to the following steps:

[0025] 1. Mix the solvent, film-forming agent and silicone resin, and stir until the silicone resin is completely dissolved in the solvent to obtain a mixed solution;

[0026] 2. Add the co-catalyst to the mixed solution, and then mix by shaking under sealed conditions to obtain an epoxy resin molding release agent that supports one-time spraying and multiple demolding.

[0027] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that the stirring speed in step one is 50 rpm to 100 rpm. The other steps are the same as in Specific Implementation Methods One to Eight.

[0028] Specific Implementation Method Ten: The difference between this implementation method and Specific Implementation Methods One to Nine is that the oscillation time in step two is 1 min to 2 min. The other steps are the same as in Specific Implementation Methods One to Nine.

[0029] The beneficial effects of the present invention are verified using the following embodiments:

[0030] Example 1: A method for preparing an epoxy resin molding release agent that supports one-time spraying and multiple demolding, specifically completed according to the following steps:

[0031] 1. Weigh out 91.9% solvent, 3% film-forming agent, 5% silicone resin and 0.1% co-catalyst by mass fraction;

[0032] The solvent mentioned in step one is D40 solvent oil;

[0033] The film-forming agent mentioned in step one is a methoxy-terminated polydimethylsiloxane with a molecular weight between 500 g / mol and 3000 g / mol and a methoxy content of 20-30 wt% in its structure.

[0034] The organosilicon resin mentioned in step one is methylphenyl silicone resin;

[0035] The cocatalyst mentioned in step two is a mixture of triethylamine and tetrabutyl titanate, wherein the mass ratio of triethylamine to tetrabutyl titanate is 1:1;

[0036] 2. Mix the solvent, film-forming agent and silicone resin, and stir at 100 rpm until the silicone resin is completely dissolved in the solvent to obtain a mixed solution;

[0037] 3. Add the co-catalyst to the mixed solution, and then shake and mix for 2 minutes under sealed conditions to obtain an epoxy resin molding release agent that supports one-time spraying and multiple demolding.

[0038] Performance Testing: First, the epoxy resin molding release agent prepared in Example 1 was uniformly coated once on the surface of a flat stainless steel mold at room temperature (completely wetting the mold surface, with no dripping, material accumulation, or missed areas). After visually inspecting the mold surface for dryness, the mold was transferred to a 100°C environment and allowed to stand for 30 minutes. Then, the mold was removed and cooled to room temperature. Two layers of triaxial fabric (glass fiber cloth + epoxy resin system) were continuously hand-laid onto the mold to prepare a composite laminate. After the laminate product cured and solidified, it was removed. Then, without reapplying the release agent, the laminate production process was repeated. The demolding effect was evaluated by observing whether there was resin / fiber residue on the mold surface and whether there were obvious defects on the laminate surface after each demolding.

[0039] Figure 1 The appearance of the sheet and the mold after six epoxy resin molding demoldings are obtained by coating the surface of the stainless steel mold with the epoxy resin molding release agent prepared in Example 1 once.

[0040] Figure 1 The experimental results show that with one application of release agent, the laminate can be successfully demolded 6 times.

Claims

1. A release agent for epoxy resin molding that supports one-time spraying and multiple demolding, characterized in that... The epoxy resin molding release agent is prepared by mass fraction of 90%~95% solvent, 2%~10% film-forming agent, 2%~10% organosilicon resin and 0.02%~2% co-catalyst.

2. The epoxy resin molding release agent supporting one-time spraying and multiple demolding as described in claim 1, characterized in that... The solvent mentioned in step one is isohexane or D40 solvent oil.

3. The epoxy resin molding release agent according to claim 1, which supports one-time spraying and multiple demolding, is characterized in that... The film-forming agent mentioned in step one is methoxy-terminated polydimethylsiloxane.

4. The epoxy resin molding release agent supporting one-time spraying and multiple demolding as described in claim 3, characterized in that... The methoxy-terminated polydimethylsiloxane has a molecular weight between 500 g / mol and 3000 g / mol, and a methoxy content of 20 to 30 wt% in its structure.

5. The epoxy resin molding release agent supporting one-time spraying and multiple demolding according to claim 1, characterized in that... The organosilicon resin mentioned in step one is methylphenyl silicone resin.

6. The epoxy resin molding release agent according to claim 1, which supports one-time spraying and multiple demolding, is characterized in that... The cocatalyst mentioned in step two is a mixture of triethylamine and tetrabutyl titanate.

7. The epoxy resin molding release agent according to claim 6, which supports one-time spraying and multiple demolding, is characterized in that... The mass ratio of triethylamine to tetrabutyl titanate in the mixture is 1:

1.

8. The method for preparing an epoxy resin molding release agent supporting one-time spraying and multiple demolding as described in claim 1, characterized in that... The preparation method is specifically carried out according to the following steps:

1. Mix the solvent, film-forming agent and silicone resin, and stir until the silicone resin is completely dissolved in the solvent to obtain a mixed solution; 2. Add the co-catalyst to the mixed solution, and then mix by shaking under sealed conditions to obtain an epoxy resin molding release agent that supports one-time spraying and multiple demolding.

9. A method for preparing an epoxy resin molding release agent that supports one-time spraying and multiple demolding according to claim 8, characterized in that... The stirring speed described in step one is 50 rpm to 100 rpm.

10. A method for preparing an epoxy resin molding release agent supporting one-time spraying and multiple demolding according to claim 8, characterized in that... The oscillation time mentioned in step two is 1 min to 2 min.

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