A modified carbon five petroleum resin and a preparation method thereof

Abstract

The present application relates to the downstream product deep processing technical field of petroleum chemical industry, provide a kind of modified carbon five petroleum resin and its preparation method, solve the defect that single carbon five petroleum resin softening point and colority in prior art is relatively single and cannot meet the needs of downstream manufacturers, made by physical blending from first cold polymerization carbon five petroleum resin and second cold polymerization carbon five petroleum resin, the softening point of the first cold polymerization carbon five petroleum resin is 85~95 DEG C, color number≤4, the softening point of the second cold polymerization carbon five petroleum resin is 97~104 DEG C, color number≤4;The weight mixing ratio of the first cold polymerization carbon five petroleum resin and second cold polymerization carbon five petroleum resin is (30-70) :(70-30).

Description

Technical Field

[0001] This invention relates to the field of deep processing technology for downstream petrochemical products, and in particular to a modified C5 petroleum resin and its preparation method, especially to obtaining a new resin grade with excellent comprehensive properties by blending specific grades of resin. Background Technology

[0002] C5 petroleum resin is a thermoplastic resin made primarily from C5 fractions through processes such as polymerization, alkali washing, water washing, and flash evaporation. Due to its advantages such as low acid value, good miscibility, water resistance, and resistance to ethanol and chemicals, it is widely used as a tackifying resin in the adhesive, rubber, coating, and ink industries.

[0003] C5 petroleum resins produced by cold polymerization are highly favored due to their narrow molecular weight distribution, light color, and stable performance. Various grades of cold-polymerized C5 resins are available on the market, such as M90G and A5100G, each with its own characteristics: M90G has a softening point of approximately 85–95°C and provides good cohesive strength and heat resistance; A5100G typically has a very light color and excellent compatibility.

[0004] In practical applications, downstream manufacturers often require a resin that simultaneously offers a high softening point, a light-colored appearance, and excellent compatibility. Current practices typically involve using a single grade or simply mixing several resins, but these methods lack systematic research and optimal formulation, resulting in limited and unstable performance improvements. Therefore, developing a method to obtain a novel, high-performance, and stable resin through scientifically proportioned mixing of existing mature grades has significant industrial application value and market potential.

[0005] Chinese patent application publication number CN120865487A discloses a method for preparing modified C5 petroleum resin and its application in hot melt adhesives. It utilizes a eutectic solvent catalyst containing AlCl3 to achieve high-quality synthesis of C5 petroleum resin under mild conditions, resulting in a higher softening point and lower color intensity. The use of an isopentenene / maleic anhydride co-modifier system comprehensively enhances the performance of the C5 resin, making it easier to meet the needs of various applications, especially in hot melt adhesives. While this application uses chemical catalysts to improve a single grade of C5 petroleum resin, resulting in a higher softening point and lower color intensity, it requires specific chemical reagents and involves a relatively complex process. Summary of the Invention

[0006] Therefore, in view of the above problems, the present invention provides a modified C5 petroleum resin and its preparation method, which solves the defects of the existing single C5 petroleum resin in terms of softening point and color, which cannot meet the needs of downstream manufacturers.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a modified C5 petroleum resin, which is made by physical blending of a first cold-polymerized C5 petroleum resin and a second cold-polymerized C5 petroleum resin, wherein the softening point of the first cold-polymerized C5 petroleum resin is 85-95℃ and the color number is ≤4 (Gardner color scale), and the softening point of the second cold-polymerized C5 petroleum resin is 97-104℃ and the color number is ≤4 (Gardner color scale); the weight mixing ratio of the first cold-polymerized C5 petroleum resin and the second cold-polymerized C5 petroleum resin is (30-70):(70-30).

[0008] Furthermore: the first cold-polymerized C5 petroleum resin is grade M90G, and the second cold-polymerized C5 petroleum resin is grade A5100G.

[0009] Furthermore, the weight mixing ratio of the first cold polycarbonate 5 petroleum resin and the second cold polycarbonate 5 petroleum resin is (40-60):(60-40).

[0010] Furthermore, the weight mixing ratio of the first cold polycarbonate 5 petroleum resin and the second cold polycarbonate 5 petroleum resin is 50:50.

[0011] A method for preparing the above-mentioned modified C5 petroleum resin includes the following preparation steps: a. Weigh the first and second cold-polymerized C5 petroleum resins according to the predetermined weight ratio; b. Weigh the first and second cold polycarbonate petroleum resins and put them into a high-temperature mixer. Under inert gas protection, heat to 150-200°C and stir at a speed of 200-500 rpm. c. Maintain the temperature and stir until the mixture is completely melted and homogenized, which may take 1-3 hours; d. The homogenized molten resin is discharged, cooled, and granulated to obtain the modified C5 petroleum resin product.

[0012] An adhesive composition comprising the modified C5 petroleum resin described above.

[0013] Furthermore, the adhesive composition is a hot melt adhesive, a pressure-sensitive adhesive, or a rubber-based adhesive.

[0014] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows: by blending M90G and A5100G in the specific proportions of the present invention, the resulting new resin grade unexpectedly combines the advantages of both: 1. Excellent compatibility: It inherits the advantages of A5100G, improves compatibility, and broadens the application range.

[0015] 2. Light-colored appearance: Thanks to the light-colored characteristics of the A5100G, it is suitable for producing high-end, light-colored or transparent end products.

[0016] 3. Good cohesive strength and heat resistance: It retains the high cohesive strength and heat resistance of M90G, ensuring the performance of adhesives and other products.

[0017] 4. Synergistic Effect: Experiments show that under the optimal ratio (e.g., 50:50), the comprehensive performance index is not a simple arithmetic average, but exhibits a synergistic enhancement effect in both compatibility and mechanical properties. Specifically, the A5100G resin of this invention is completely compatible with various non-volatile matrices such as rubber and thermoplastic elastomers, eliminating the slight phase separation problem that may occur when using M90G resin alone, and broadening the resin's applicability in pressure-sensitive adhesives, hot melt adhesives, rubber-based adhesives, and other fields. Although M90G and A5100G are both cold-polymerized C5 resins, their molecular weight distribution and microstructure differ. When blended in a specific ratio, the molecular chains of the two resins interpenetrate and entangle, forming a denser and more uniform physical cross-linked network. This network structure can more effectively disperse stress than the network of a single component, thus exhibiting a greater enhancement effect on mechanical properties such as peel strength than that of a single component. In addition, the two resins contain different types or numbers of unsaturated bonds and trace amounts of polar groups. Under the optimal blending ratio, these groups achieve a better balance of interaction, which enhances the interfacial bonding force. As a result, both compatibility (microscopic uniformity) and mechanical properties (macroscopic strength) are improved, achieving a balance and transcendence in performance.

[0018] 5. Cost-effectiveness: This method has a simple process, does not require complex chemical reaction equipment, and uses existing mature grades for mixing, resulting in low production costs and easy industrialization. Detailed Implementation

[0019] Examples 1-3 and Comparative Examples Weigh out M90G resin and A5100G resin according to the proportions shown in the table below. Both the M90G and A5100G resins used in this invention are from Fujian Fuhua Luhua New Materials Co., Ltd.

[0020] Sample number M90G (wt%) A5100G (wt%) Remark Comparative Example 1 100 0 Pure M90G Comparative Example 2 0 100 Pure A5100G Example 1 30 70 Scope of the invention Example 2 50 50 The most preferred embodiment of the present invention Example 3 70 30 Scope of the invention The resin samples were placed in a 500ml glass reactor under nitrogen protection and heated to 180℃. The mixture was stirred at 300rpm for 2 hours. The molten resin was then poured onto a preheated polytetrafluoroethylene (PTFE) plate for molding. After cooling, its properties were tested. The test results are shown in the table below:

[0021] Results analysis: The data in the table show that Example 2 (50:50) exhibits the best overall performance. Its softening point (97°C) is comparable to that of both raw material resins, maintaining good heat resistance. Most importantly, its peel strength is higher than either single resin, demonstrating a significant synergistic reinforcing effect.

[0022] Examples 1 and 3 also successfully achieved properties between the two raw material resins, and both achieved good compatibility, allowing selection based on the downstream application's emphasis on color or strength.

[0023] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A modified C5 petroleum resin, characterized in that, It is made by physical blending of a first cold polycarbonate petroleum resin and a second cold polycarbonate petroleum resin. The softening point of the first cold polycarbonate petroleum resin is 85-95℃ and the color number is ≤4. The softening point of the second cold polycarbonate petroleum resin is 97-104℃ and the color number is ≤4. The weight mixing ratio of the first cold polycarbonate petroleum resin and the second cold polycarbonate petroleum resin is (30-70):(70-30).

2. The modified C5 petroleum resin according to claim 1, characterized in that: The first cold-polymerized C5 petroleum resin is grade M90G, and the second cold-polymerized C5 petroleum resin is grade A5100G.

3. The modified C5 petroleum resin according to claim 1, characterized in that: The weight mixing ratio of the first cold polycarbonate 5 petroleum resin and the second cold polycarbonate 5 petroleum resin is (40-60):(60-40).

4. The modified C5 petroleum resin according to claim 3, characterized in that: The weight mixing ratio of the first cold polycarbonate 5 petroleum resin and the second cold polycarbonate 5 petroleum resin is 50:

50.

5. The method for preparing the modified C5 petroleum resin according to any one of claims 1-4, characterized in that, The preparation steps include the following: a. Weigh the first and second cold-polymerized C5 petroleum resins according to the predetermined weight ratio; b. Weigh the first and second cold polycarbonate petroleum resins and put them into a high-temperature mixer. Under inert gas protection, heat to 150-200°C and stir at a speed of 200-500 rpm. c. Maintain the temperature and stir until the mixture is completely melted and homogenized, which may take 1-3 hours; d. The homogenized molten resin is discharged, cooled, and granulated to obtain the modified C5 petroleum resin product.

6. An adhesive composition, characterized in that, It comprises the modified C5 petroleum resin as described in any one of claims 1-4.

7. The adhesive composition according to claim 6, characterized in that: The adhesive composition is a hot melt adhesive, a pressure-sensitive adhesive, or a rubber-based adhesive.

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