Warp sizing process of glass fiber cloth for IC package carrier

Abstract

The invention provides a warp sizing process of glass fiber cloth for an IC packaging carrier plate, and belongs to the technical field of electronic-grade glass fiber cloth manufacturing. Comprising the following steps: pretreatment, sizing and drying. According to the invention, the warp yarns of the glass fiber cloth are pretreated before sizing, the pretreatment liquid is the aqueous solution of the polyether low-foaming surfactant, the surface tension of the glass fiber yarns is reduced, and the glass fiber yarns are more easily and completely infiltrated by the sizing agent during sizing; according to the sizing slurry formula, grafted polyacrylate starch with higher bundling property and a carboxymethyl cellulose compound system which is better in film-forming property, more environment-friendly and easier to desize are adopted, and a surfactant, an antistatic agent and a lubricant are added, so that the wettability of the slurry to glass fiber yarns is further promoted, the bundling property is improved, and the sizing effect is improved. Friction between the glass fiber yarns and between the glass fiber yarns and parts of a production machine and a large amount of static electricity generated by the friction are reduced, and adhesion between monofilaments of the glass fiber yarns is reduced.

Description

Technical Field

[0001] This invention relates to a warp sizing process for glass fiber cloth used in IC packaging substrates, belonging to the field of electronic-grade glass fiber cloth manufacturing technology. Background Technology

[0002] Fiberglass cloth is a brittle material, not resistant to folding or abrasion, and prone to producing broken fibers and fuzz. Before weaving, the warp yarns of fiberglass cloth need to be sized to reduce broken fibers and fuzz generated during the weaving process. Broken fibers and fuzz affect the quality of the finished fiberglass cloth and can easily cause abnormalities such as adhesive particles in downstream customers' products. Figure 1 As shown, the existing sizing process for glass fiber cloth involves directly feeding the warp yarns into a sizing tank for pressing and then drying them in an oven. Due to the high surface tension of the warp yarns, this sizing process makes it difficult to completely wet the glass fiber yarns, affecting their bundled properties.

[0003] Currently, the standard sizing formula for glass fiber cloth warp yarns is a combination of PVA and PEG. This formula generally meets the requirements for standard electronic-grade glass fiber cloth, but for high-end products, it still occasionally results in abnormal particle formation due to broken fibers and fuzz. With the rapid development of low thermal expansion coefficient (LTC) glass fiber cloth, this sizing formula is gradually failing to meet customer needs. This is because LTC glass fiber cloth has a higher SiO2 content, making it more brittle, less wear-resistant, and more prone to broken fibers and fuzz. Furthermore, LTC glass fiber cloth is mostly used in high-end IC packaging substrates, and broken fibers and fuzz on the surface of the glass fiber cloth have a significant impact on quality. With increasing production capacity and faster weaving speeds, existing sizing formulas are no longer sufficient to maintain the bundled properties of the glass fiber warp yarns, and the glass fiber monofilaments are easily dispersed during weaving, resulting in broken fibers and fuzz.

[0004] Therefore, it is urgent to improve the warp sizing process of glass fiber cloth in order to improve the surface quality of glass fiber cloth with low thermal expansion coefficient. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates. This invention adds a warp yarn pretreatment tank to the existing sizing process. The pretreatment tank contains an aqueous solution of a low-foaming surfactant to pretreat the glass fiber yarn, reducing its surface tension. This allows the sizing agent to more easily and completely wet the glass fiber yarn during sizing, especially between the adhered monofilaments, improving the bundled properties of the glass fiber yarn and reducing breakage and fuzzing. The sizing agent formulation provided by this invention uses a compound of grafted polyacrylate starch with stronger bundled properties and carboxymethyl cellulose, which has better film-forming properties, is more environmentally friendly, and easier to desizing. The slurry is made by grafting synthetic high-molecular-weight polyacrylate onto starch molecular chains. This slurry combines the environmental friendliness of natural starch with the strong binding properties of synthetic polymers. To further enhance the wettability of the slurry to the glass fiber yarn, a small amount of polyether-based low-foaming surfactant is added to the slurry aqueous solution. To reduce static electricity generated by high-speed friction between the glass fiber yarn and the machine equipment, a small amount of nonionic antistatic agent is added to the slurry aqueous solution. In addition, to reduce friction between glass fiber yarns and between the glass fiber yarn and the production machine parts, and to prevent the slurry film from falling off, a small amount of polysiloxane lubricant is added.

[0006] This invention provides a sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates, using the following technical solution: This invention provides a sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates, comprising the following steps: Step 1. Pretreatment: The warp yarns of the fiberglass cloth first enter the pretreatment tank for pretreatment to reduce the surface tension of the warp yarns of the fiberglass cloth; Step 2. Sizing: The warp yarns of the pretreated glass fiber cloth obtained in Step 1 enter the sizing tank and are sized by the sizing extrusion rollers. The sizing material is then applied to the sizing extrusion rollers by the sizing material spraying head. Step 3. Drying: The warp yarns of the sized glass fiber cloth obtained in step 2 are fed into an oven through rollers for drying.

[0007] Preferably, in step 1, the pretreatment solution formula in the pretreatment tank is as follows (by mass percentage): Polyether-based low-foaming surfactants: 0.01~0.03%; Pure water 99.97~99.99%.

[0008] Preferably, in step 2, the formulation of the sizing slurry in the sizing tank is as follows (by mass percentage): Grafted polyacrylate starch 4-6%; Carboxymethyl cellulose 3-4.5%; Polyether-based low-foaming surfactants: 0.03~0.05%; Nonionic antistatic agent 0.01~0.03%; Polysiloxane lubricants: 0.01~0.03%; Pure water 89.39~92.95%.

[0009] Preferably, the preparation method of the sizing slurry is as follows: first, pure water is added to the slurry soaking tank, then grafted polyacrylic acid starch is added to the pure water, the stirrer is turned on, the stirring frequency is 40Hz, and after stirring for 30 minutes, carboxymethyl cellulose is added and stirred for 30 minutes. Then, polyether-based low-foaming surfactant, nonionic antistatic agent and polysiloxane lubricant are added in sequence. The slurry is heated to 95~97℃ and kept at that temperature for 1 hour. The stirrer is always turned on during the slurry preparation process, and finally a uniform sizing slurry is obtained. The stirring frequency is adjusted to 20Hz.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This invention pre-treats the warp yarns of glass fiber cloth before sizing. The pre-treatment solution is an aqueous solution of a low-foaming polyether surfactant, which reduces the surface tension of the warp yarns. This allows the sizing agent to more easily and completely wet the glass fiber yarns during sizing, improving their bundled properties and reducing breakage and fuzzing. The sizing agent formulation of this invention uses a compound system of grafted polyacrylate starch with stronger bundled properties and carboxymethyl cellulose, which has better film-forming properties, is more environmentally friendly, and easier to desizing. This significantly enhances the bundled effect between the glass fiber monofilaments, making the glass fiber monofilaments more wear-resistant and less prone to dispersion during the weaving process. To prevent abnormal fiber breakage and fuzzing, surfactants were added to the slurry system to further promote the wettability of the slurry to the glass fiber yarn and improve its bundle properties. During the production process, the high-speed friction between the glass fiber yarn and the machine equipment generates a large amount of static electricity, which can cause the glass fiber yarn monofilaments to adhere to each other. Therefore, an antistatic agent was added to reduce the adhesion between the glass fiber yarn monofilaments and to facilitate the full wettability of the glass fiber yarn monofilaments by the slurry. In addition, a small amount of polysiloxane lubricant was added to reduce the friction between glass fiber yarns and between the glass fiber yarn and the production machine parts, preventing the slurry film from falling off. Attached Figure Description

[0011] Figure 1 A schematic diagram of an existing glass fiber cloth warp sizing device; Figure 2 This is a schematic diagram of the warp sizing device for glass fiber cloth provided in Embodiment 1 of the present invention.

[0012] Figure reference numerals: 1. Warp yarn of fiberglass cloth; 2. Sizing extrusion roller A; 3. Sizing extrusion roller B; 4. Sizing slurry; 5. Sizing tank; 6. Roller; 7. Oven; 8. Sizing slurry spray head; 9. Pretreatment tank; 10. Pretreatment liquid. Detailed Implementation

[0013] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0014] This invention provides a sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates, comprising the following steps: pretreatment, sizing, and drying. Before sizing the warp yarns, the glass fiber cloth undergoes pretreatment. The pretreatment solution is an aqueous solution of a low-foaming polyether surfactant, which reduces the surface tension of the warp yarns, making it easier for the sizing agent to completely wet the glass fiber yarns during sizing. The sizing agent formulation of this invention uses a compound system of grafted polyacrylate starch with stronger bundling properties and carboxymethyl cellulose with better film-forming properties, greater environmental friendliness, and easier desizing. Surfactants, antistatic agents, and lubricants are added to further promote the wettability of the sizing agent on the glass fiber yarns, improve bundling properties, reduce friction between glass fiber yarns and between glass fiber yarns and production machine parts, and reduce the large amount of static electricity generated, thus reducing adhesion between glass fiber yarn filaments.

[0015] The carboxymethyl cellulose used was Sigma-Aldrich C5013; the grafted polyacrylate starch used was Xida Chemical DF868 grafted starch; the polyether low-foaming surfactant used was BASF Pluronic PE6100; the nonionic antistatic agent used was Kao Corporation's ELEC TS-5; and the polysiloxane lubricant used was Dow's DOWSIL 1349 Emulsion.

[0016] Example 1 This invention provides a sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates, such as... Figure 2 As shown, it includes the following steps: Step 1. Pretreatment: The warp yarns 1 of the glass fiber cloth first enter the pretreatment tank 9 for pretreatment to reduce the surface tension of the warp yarns of the glass fiber cloth; Step 2. Sizing: The warp yarn 1 of the pretreated glass fiber cloth obtained in Step 1 enters the sizing tank 5 and is sized by the sizing extrusion roller A 2 and the sizing extrusion roller B 3. The sizing head 8 sprays the sizing material onto the sizing extrusion roller. Step 3. Drying: The warp yarns of the sized glass fiber cloth obtained in Step 2 are fed into the drying oven 7 through roller 6 for drying.

[0017] In step 1, the formula of the pretreatment liquid 10 in the pretreatment tank 9 is as follows (by mass percentage): Polyether-based low-foaming surfactants: 0.01~0.03%; Pure water 99.97~99.99%.

[0018] In step 2, the formula for the sizing slurry 4 in the sizing tank 5 is as follows (by mass percentage): Grafted polyacrylate starch 4-6%; Carboxymethyl cellulose 3-4.5%; Polyether-based low-foaming surfactants: 0.03~0.05%; Nonionic antistatic agent 0.01~0.03%; Polysiloxane lubricants: 0.01~0.03%; Pure water 89.39~92.95%.

[0019] Comparative Example 1 A sizing process for the warp yarns of glass fiber cloth for IC packaging substrates is the same as in Example 1, except that step 1 is omitted, and the warp yarns of the glass fiber cloth are directly sized without pretreatment.

[0020] Comparative Example 2 A sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates is the same as in Example 1, except that in step 2, the sizing slurry formulation in the sizing tank is as follows (by mass percentage): Grafted polyacrylate starch 4-6%; Polyether-based low-foaming surfactants: 0.03~0.05%; Nonionic antistatic agent 0.01~0.03%; Polysiloxane lubricants: 0.01~0.03%; Pure water 93.89~95.95% Sizing treatment of warp yarns for T1017 and T1078 fiberglass cloth.

[0021] Comparative Example 3 A sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates is the same as in Example 1, except that in step 2, the sizing slurry formulation in the sizing tank is as follows (by mass percentage): Carboxymethyl cellulose 3-4.5%; Polyether-based low-foaming surfactants: 0.03%~0.05%; Nonionic antistatic agent 0.01%~0.03%; Polysiloxane lubricants: 0.01%~0.03%; Pure water 95.39~96.95% Sizing treatment of warp yarns for T1017 and T1078 fiberglass cloth.

[0022] Comparative Example 4 A conventional sizing process for the warp yarns of fiberglass cloth used in IC packaging substrates involves sizing the fiberglass cloth directly without any pretreatment steps. The sizing sizing agent formulation in the sizing tank is as follows: Polyvinyl alcohol 7.0% Polyethylene glycol 1.0% 92.0% pure water Sizing treatment of warp yarns for T1017 and T1078 fiberglass cloth.

[0023] The following are the tests on the surface fraying, fuzzing, and snapping points of the fiberglass fabrics obtained by the warp sizing process of Example 1 and Comparative Examples 1-4:

[0024] According to test data, the glass fiber fabric treated with the warp sizing process provided by this invention has significantly fewer broken fibers and fuzz.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A sizing process for the warp yarns of glass fiber cloth used in IC packaging substrates, characterized in that, Includes the following steps: Step 1. Pretreatment: The warp yarns of the fiberglass cloth first enter the pretreatment tank for pretreatment to reduce the surface tension of the warp yarns of the fiberglass cloth; Step 2. Sizing: The warp yarns of the pretreated glass fiber cloth obtained in Step 1 enter the sizing tank and are sized by the sizing extrusion rollers. The sizing material is then applied to the sizing extrusion rollers by the sizing material spraying head. Step 3. Drying: The warp yarns of the sized glass fiber cloth obtained in step 2 are fed into an oven through rollers for drying.

2. The sizing process for the warp yarns of the glass fiber cloth according to claim 1, characterized in that, In step 1, the pretreatment solution in the pretreatment tank is formulated as follows by mass percentage: Polyether-based low-foaming surfactants: 0.01~0.03%; Pure water 99.97~99.99%.

3. The warp sizing process of the glass fiber cloth according to claim 1, characterized in that, In step 2, the sizing slurry in the sizing tank is formulated as follows by mass percentage: Grafted polyacrylate starch 4-6%; Carboxymethyl cellulose 3-4.5%; Polyether-based low-foaming surfactants: 0.03~0.05%; Nonionic antistatic agent 0.01~0.03%; Polysiloxane lubricants: 0.01~0.03%; Pure water 89.39~92.95%.

4. The warp sizing process of glass fiber cloth according to claim 3, characterized in that, The preparation method of the sizing slurry is as follows: First, put pure water into the slurry soaking tank, then add grafted polyacrylic acid starch into the pure water, turn on the stirrer, stir at a frequency of 40 Hz, stir for 30 min, then add carboxymethyl cellulose, stir for 30 min, then add polyether-based low-foaming surfactant, nonionic antistatic agent and polysiloxane lubricant in sequence, heat the slurry to 95~97℃, keep it at this temperature for 1 h, the stirrer is always on during the slurry preparation process, and finally a uniform sizing slurry is obtained, the stirring frequency is adjusted to 20 Hz.

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