Loudspeaker vibrating reed containing water-soluble phenol formaldehyde resin and manufacturing method thereof

Abstract

The invention provides a manufacturing method of a loudspeaker vibrating reed containing water-soluble phenol formaldehyde resin. The manufacturing method comprises the following steps: adding phenol, formaldehyde and a catalyst into a reaction kettle to form the water-soluble phenol formaldehyde resin; reacting at the temperature of 65 DEG C for 1-4 hours; vacuumizing is carried out at the atmospheric pressure of 400 mmHg to 650 mmHg; cooling to 35 DEG C; the solid content is adjusted to 67-69 wt%, and the pH value is adjusted to 7-10; discharging is conducted; water is added for dilution to adjust the viscosity to 300-400 cps / 25 DEG C so as to form a resin solution, the gelation time is 10-20 minutes / 150 DEG C, the water-soluble phenol formaldehyde resin accounts for 65-70% of the resin solution, the water accounts for 30-35% of the resin solution, and the specific gravity of the resin solution is 1.20-1.30; the base material is impregnated in the resin solution; drying the base material; forming a loudspeaker vibrating reed on the base material; and separating the loudspeaker vibrating reed from the base material.

Description

Technical Field

[0001] The present invention relates to a speaker vibration plate and a manufacturing method thereof, in particular to a speaker vibration plate containing water-soluble phenol formaldehyde resin and a manufacturing method thereof. Background Art

[0002] A general dynamic speaker produces sound by using the principle that the reaction force of a fixed magnetic field causes another magnetic field to move in the opposite direction (i.e., opposites attract and likes repel). Specifically, the power alternating current generated by the power amplifier is transmitted to the voice coil via a wire to change the polarity of the magnetic field, causing the voice coil to produce a reaction force relative to the fixed sector generated by the magnetic return device. Positive pulses cause the diaphragm to move outward relative to the magnet, and negative pulses cause the diaphragm to move inward. When the voice coil pushes the diaphragm to reciprocate, the diaphragm pushes the air, and the air pressure changes to form sound waves. The elastic wave is responsible for maintaining the correct position of the voice coil in the gap of the iron core of the magnet, ensuring that the voice coil reciprocates along the axis when subjected to force. The suspension edge is set between the diaphragm and the outer frame to support the diaphragm.

[0003] Many of the non-metal parts contained in a general speaker are made of substrates such as paper or cloth. The main reason is that the specially treated substrate has appropriate elasticity and strength, and can provide the required functional requirements when the speaker is in operation. For example: diaphragm, elastic wave, suspension edge or drum paper in small speakers are all included. These non-metal parts are collectively called speaker vibration plates.

[0004] The manufacturing method of the speaker vibration plate includes the following steps: a substrate is impregnated with a resin solution; the substrate is dried to form a resin solid layer on the substrate; a speaker vibration plate shape is formed on the substrate by hot pressing; and the speaker vibration plate shape is cut from the substrate to obtain a speaker vibration plate. The speaker vibration plate includes a body and a resin solid layer, and the resin solid layer is formed on the surface of the body.

[0005] The resin solution commonly used in the industry currently contains oil-soluble phenolic resin, which needs to be dissolved in an organic solvent (e.g., alcohol) to form a resin solution. Therefore, substrate drying is only to remove the water in the resin solution, and the oil-soluble phenolic resin and organic solvent in the resin solution still exist on the surface of the substrate to form a resin solid layer. In other words, the resin solid layer contains oil-soluble phenolic resin and organic solvent. Therefore, the speaker vibration plate contains phenolic compounds, aldehyde compounds and organic solvents.

[0006] Generally speaking, phenolic compounds, aldehyde compounds and organic solvents are volatile and toxic, and are obviously harmful to the human body. When the concentration of phenolic compounds, aldehyde compounds and organic solvents exceeds a certain concentration, if people inhale too much phenolic compounds, aldehyde compounds and organic solvents in a short period of time, they will feel headaches, nausea, vomiting, and weakness in their limbs; in severe cases, they will have convulsions, coma, and memory loss. Phenolic compounds, aldehyde compounds and organic solvents can also damage the liver, kidneys, brain and nervous system of the human body, and they also contain many carcinogens. Summary of the invention

[0007] The main purpose of the present invention is to provide a speaker vibration plate containing water-soluble phenol formaldehyde resin and a manufacturing method thereof, wherein the water-soluble phenol formaldehyde resin replaces the oil-soluble phenol formaldehyde resin so that the speaker vibration plate does not contain organic solvents.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a method for manufacturing a speaker vibration plate containing a water-soluble phenol-formaldehyde resin, comprising the following steps: adding phenol, formaldehyde and a catalyst into a reaction kettle to form a water-soluble phenol-formaldehyde resin, wherein the ratio of phenol to the total of phenol and formaldehyde is 30-50% (w / w), the ratio of formaldehyde to the total of phenol and formaldehyde is 50-70% (w / w), and the catalyst is 1-5% (w / w); reacting at a temperature of 65° C. for 1-4 hours; evacuating at an atmospheric pressure of 400-650 mmHg; cooling to 35° C.; adjusting the solid content to 67-69wt%, and adjusting the pH to pH 7-10; unloading; and diluting with water to adjust the viscosity to 300-400cps / 25°C to form a resin solution, the gel time of the resin solution is 10-20 minutes / 150°C, the proportion of the water-soluble phenol formaldehyde resin to the resin solution is 65-70%, the proportion of water to the resin solution is 30-35%, and the specific gravity of the resin solution is 1.20-1.30; a substrate is impregnated with the resin solution; the substrate is dried to form a resin solid layer on the substrate; a speaker vibration plate is formed on the substrate; the speaker vibration plate is separated from the substrate; wherein the following formula is the water-soluble phenol formaldehyde resin:

[0009] [C 6 H 6 OCH 2 O] n

[0010] Wherein, n is 50 to 70.

[0011] In some embodiments, the substrate is woven from rock wool or glass fiber.

[0012] In some embodiments, the pH value is adjusted to 9.2-9.7, and the specific gravity of the resin solution is 1.23.

[0013] In some embodiments, the catalyst is selected from the group consisting of oxalic acid, hydrochloric acid, sulfuric acid, phosphoric acid, aqueous ammonia, sodium hydroxide, barium hydroxide, potassium hydroxide, magnesium hydroxide, and calcium hydroxide.

[0014] In some embodiments, the step of drying the substrate further comprises: using an extrusion device to extrude excess water-soluble phenol formaldehyde resin from the substrate; and baking the substrate at a temperature of 100 to 120° C. for a drying time of 10 to 30 minutes.

[0015] In some embodiments, the step of forming the speaker vibration plate on the substrate further includes: hot pressing the substrate at a temperature of 130-180° C. for 30-90 minutes to form the speaker vibration plate on the substrate.

[0016] In order to achieve the above-mentioned purpose, the present invention provides a speaker vibration plate containing water-soluble phenol formaldehyde resin, which includes a body and a resin solid layer. The resin solid layer is formed on the surface of the body by drying a resin solution. The resin solution is formed by diluting a water-soluble phenol formaldehyde resin with water. The composition of the water-soluble phenol formaldehyde resin includes phenol, formaldehyde and a catalyst. The proportion of phenol to the total of phenol and formaldehyde is 30-50% (w / w), the proportion of formaldehyde to the total of phenol and formaldehyde is 50-70% (w / w), the catalyst is 1-5% (w / w), the solid content of the resin solution is 67-69wt%, the pH of the resin solution is pH 7-10, the viscosity of the resin solution is 300-400cps / 25°C, the proportion of the water-soluble phenol formaldehyde resin to the resin solution is 65-70%, the proportion of water to the resin solution is 3-35%, and the specific gravity of the resin solution is 1.20-1.30. The following formula is the water-soluble phenol formaldehyde resin:

[0017] [C 6 H 6 OCH 2 O] n

[0018] Wherein, n is 50 to 70.

[0019] In some embodiments, the body is woven from rock wool or glass fiber.

[0020] In some embodiments, the pH value of the resin solution is 9.2-9.7, and the specific gravity of the resin solution is 1.23.

[0021] In some embodiments, the catalyst is selected from the group consisting of oxalic acid, hydrochloric acid, sulfuric acid, phosphoric acid, aqueous ammonia, sodium hydroxide, barium hydroxide, potassium hydroxide, magnesium hydroxide, and calcium hydroxide.

[0022] The effect of the present invention is that the present invention uses water-soluble phenol formaldehyde resin as the resin material to replace the oil-soluble phenol formaldehyde resin, so that water can be used as a solvent to replace the organic solvent. Therefore, the speaker vibration plate does not contain organic solvents, meets environmental protection requirements, and the user's body will not be harmed by the gas after the organic solvent evaporates. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a flow chart of the method of the present invention;

[0024] Figure 2 is a flow chart of step S100 of the present invention;

[0025] Figure 3 is a flow chart of step S300 of the present invention;

[0026] Figure 4 is a schematic diagram of the method of the present invention;

[0027] Figure 5 Schematic diagram of the speaker vibration plate of the present invention.

[0028] 10: substrate;

[0029] 20: resin tank;

[0030] 21: resin solution;

[0031] 30: extrusion device;

[0032] 40: drying device;

[0033] 41: Place on baking sheet;

[0034] 42: lower baking plate;

[0035] 50: hot pressing forming device;

[0036] 51: forming mold;

[0037] 511: Upper mold;

[0038] 512: lower die;

[0039] 60: cutting device;

[0040] 61: upper cutting tool;

[0041] 62: lower cutting tool;

[0042] 100: speaker vibration plate;

[0043] 110: Ontology;

[0044] 111: warp;

[0045] 112: weft yarn;

[0046] 120: resin solid layer;

[0047] S100~S500: steps;

[0048] S110~S170: steps;

[0049] S310~S320: steps. DETAILED DESCRIPTION

[0050] The following is a more detailed description of the embodiments of the present invention with the help of drawings and component symbols, so that those skilled in the art can implement the invention after reading this specification.

[0051] Figure 1 is a flow chart of the method of the present invention. Figure 2 It is a flowchart of step S100 of the present invention. Figure 3 It is a flow chart of step S300 of the present invention. Figure 4 It is a schematic diagram of the method of the present invention. Figures 1 to 4 As shown, the present invention provides a method for manufacturing a speaker vibration plate containing a water-soluble phenol formaldehyde resin, comprising the following steps:

[0052] Step S100 includes the following steps: Step S110, phenol (C 6 H 5 OH, also known as carbolic acid), formaldehyde (CH 2 O) and a catalyst are added into a reaction kettle (not shown) to form a water-soluble phenol-formaldehyde resin, wherein the proportion of phenol to the total of phenol and formaldehyde is 30-50% (w / w), the proportion of formaldehyde to the total of phenol and formaldehyde is 50-70% (w / w), and the catalyst is 1-5% (w / w); step S120, reacting at a temperature of 65° C. for 1-4 hours; step S130, evacuating at an atmospheric pressure of 400-650 mmHg; step S140, cooling to 35° C.; step S150, adjusting the solid content to 67-69wt%, and adjusting the pH to pH 7-10; Step S160, unloading; Step S170, diluting with water to adjust the viscosity to 300-400 cps (centipoise) / 25°C to form a resin solution 21, the gel time of the resin solution 21 is 10-20 minutes / 150°C, the proportion of the water-soluble phenol formaldehyde resin in the resin solution 21 is 65-70%, the proportion of water in the resin solution 21 is 30-35%, and the specific gravity of the resin solution 21 is 1.20-1.30. Among them, the following formula is the water-soluble phenol formaldehyde resin:

[0053] [C 6 H 6 OCH 2 O] n

[0054] Wherein, n is 50 to 70.

[0055] Preferably, the pH value is adjusted to 9.2-9.7, the specific gravity of the resin solution 21 is 1.23, and the catalyst is selected from the group consisting of oxalic acid, hydrochloric acid, sulfuric acid, phosphoric acid, ammonia water, sodium hydroxide, barium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.

[0056] In step S200, a substrate 10 is woven from a plurality of warp yarns 111 and a plurality of weft yarns 112, so that the substrate 10 is substantially a cloth material; a resin solution 21 is contained in a resin tank 20, and the substrate 10 is impregnated with the resin solution 21 in the resin tank 20, so that the plurality of warp yarns 111 and the plurality of weft yarns 112 of the substrate 10 absorb and adhere to the water-soluble phenol formaldehyde resin. Preferably, the warp yarns 111 and the weft yarns 112 are rock wool or glass fiber, that is, the substrate 10 is woven from rock wool or glass fiber.

[0057] Step S300 includes the following steps: Step S310, an extrusion device 30 squeezes out the excess water-soluble phenol formaldehyde resin in the substrate 10; and Step S320, an upper baking plate 41 and a lower baking plate 42 of a drying device 40 are raised to 100-120°C, and the substrate 10 is baked at a temperature of 100-120°C for 10-30 minutes, so that the water, partially volatilized phenol and formaldehyde in the water-soluble phenol formaldehyde resin on the substrate 10 are removed together to dry the substrate 10. The water-soluble phenol formaldehyde resin on the surface of the substrate 10 is able to penetrate into the interior of the substrate 10 and adhere to the warp yarns 111 and the weft yarns 112 to form a resin solid layer 120. Preferably, the extrusion device 30 is a roller.

[0058] To be more specific, the amount of water-soluble phenol-formaldehyde resin that can be adsorbed by the substrate 10 is fixed, but because the water-soluble phenol-formaldehyde resin is sticky, there will be an excess of water-soluble phenol-formaldehyde resin adhering to the substrate 10. If the excess water-soluble phenol-formaldehyde resin on the substrate 10 is not squeezed out before drying the substrate 10, the following problems will occur: first, a longer baking time is required to dry the substrate 10; second, after drying the substrate 10, the excess water-soluble phenol-formaldehyde resin clumps together on the surface of the substrate 10; third, the phenol and formaldehyde content of the substrate 10 is high.

[0059] In the present invention, before drying the substrate 10, the extrusion device 30 first squeezes out the excess water-soluble phenol-formaldehyde resin in the substrate 10, which has the following advantages: first, shortening the baking time; second, preventing the excess water-soluble phenol-formaldehyde resin from agglomerating and clumping on the surface of the substrate 10 after drying the substrate 10; and third, reducing the content of phenol and formaldehyde in the substrate 10.

[0060] In step S400, an upper mold 511 and a lower mold 512 of a molding die 51 of a hot press molding device 50 are molded together and pressurized on the substrate 10. At the same time, a heating device (not shown) of the hot press molding device 50 is powered on to raise the temperature of the upper mold 511 and the lower mold 512 to 130-180° C. The substrate 10 is hot pressed at a temperature of 130-180° C. The molding time is 30-90 minutes, so as to soften the water-soluble phenol formaldehyde resin on the substrate 10. In addition to breaking the water-soluble phenol formaldehyde resin, the water-soluble phenol formaldehyde resin also fills the gaps and connects to form the final shape of the resin solid layer 120, so as to cover between the warp yarns 111 and the weft yarns 112, so as to hot press mold a speaker vibration plate 100 on the substrate 10.

[0061] In step S500 , an upper cutter 61 and a lower cutter 62 of a cutting device 60 cut the speaker diaphragm 100 from the substrate 10 , so that the speaker diaphragm 100 is separated from the substrate 10 .

[0062] Figure 5 FIG. 1 is a schematic diagram of a speaker vibration plate 100 of the present invention. Figure 5 As shown, the present invention provides a speaker vibration plate 100 containing water-soluble phenol formaldehyde resin, including a body 110 and a resin solid layer 120. The body 110 is woven by a plurality of warp yarns 111 and a plurality of weft yarns 112. The resin solid layer 120 is formed on the surface of the body 110 by drying a resin solution 21. The resin solution 21 is formed by diluting a water-soluble phenol formaldehyde resin with water. The composition of the water-soluble phenol formaldehyde resin includes phenol, formaldehyde and a catalyst, the proportion of phenol to the total of phenol and formaldehyde is 30-50% (w / w), the proportion of formaldehyde to the total of phenol and formaldehyde is 50-70% (w / w), and the catalyst is 1-5% (w / w). The solid content of the resin solution 21 is 67-69wt%. The pH value of the resin solution 21 is pH 7-10, and the viscosity of the resin solution 21 is 300-400cps / 25℃. The proportion of the water-soluble phenol formaldehyde resin in the resin solution 21 is 65-70%, the proportion of water in the resin solution 21 is 30-35%, and the specific gravity of the resin solution 21 is 1.20-1.30. The following formula is the water-soluble phenol formaldehyde resin:

[0063] [C 6 H 6 OCH2 O] n

[0064] Wherein, n is 50 to 70.

[0065] Preferably, the warp yarns 111 and the weft yarns 112 are rock wool or glass fiber, that is, the body 110 is woven from rock wool or glass fiber.

[0066] Preferably, the pH value of the resin solution 21 is 9.2-9.7, and the specific gravity of the resin solution 21 is 1.23.

[0067] Thus, the present invention uses water-soluble phenol formaldehyde resin as the resin material to replace oil-soluble phenol formaldehyde resin, and thus can use water as the solvent to replace the organic solvent. Therefore, the speaker vibration plate 100 does not contain organic solvents, meets environmental protection requirements, and the user's body will not be harmed by the gas after the organic solvent evaporates.

[0068] Furthermore, under the conditions of specific composition and specific ratio, the water-soluble phenol formaldehyde resin of the present invention can make the speaker vibration plate 100 have uniform elastic recovery force, fatigue resistance, and resistance to deformation and brittle cracking, thereby improving the sound quality output by the speaker vibration plate 100.

[0069] In addition, under the condition that the preparation conditions of the resin solution 21 are properly controlled, the water solubility of the resin solution 21 in reverse osmosis water and tap water can be greatly improved, thereby achieving the effect of reducing the content of free phenol and free formaldehyde in the resin solution 21. The content of phenol and formaldehyde in the speaker vibration plate 100 can be reduced to a range that meets the safety standards of countries around the world.

[0070] Furthermore, the drying step S300 of the present invention can also reduce the content of phenol and formaldehyde in the substrate 10 , and the content of phenol and formaldehyde in the speaker diaphragm 100 can be further reduced.

[0071] It is worth mentioning that, compared with water-soluble phenolic resins made of other phenolic compounds and other aldehyde compounds, the water-soluble phenol-formaldehyde resin made of phenol and formaldehyde in the present invention, combined with specific preparation conditions, makes the water-soluble phenol-formaldehyde resin of the present invention have a relatively strong penetration power and provide a good impregnation effect. The warp yarns 111 and the weft yarns 112 of the substrate 10 can absorb and adhere to more water-soluble phenol-formaldehyde resin, thereby improving the formability, heat resistance and moisture resistance of the substrate 10. Therefore, the substrate 10 is easier to form a speaker vibration plate 100 with the correct shape, and the speaker vibration plate 100 has better heat resistance and moisture resistance. Especially when the pH value is pH 9.2-9.7 and the specific gravity of the resin solution 21 is 1.23, the effect is more significant.

[0072] Importantly, the water-soluble phenol-formaldehyde resin of the present invention has a particularly significant impregnation effect on the substrate 10 made of rock wool or glass fiber, and the rock wool or glass fiber can absorb and adhere to more water-soluble phenol-formaldehyde resin, thereby further improving the moldability, heat resistance and moisture resistance of the substrate 10. Therefore, the substrate 10 made of rock wool or glass fiber is easier to form a speaker vibration plate 100 with a correct shape, and the speaker vibration plate 100 has better heat resistance and moisture resistance.

[0073] The above description is only used to explain the preferred embodiments of the present invention, and is not intended to limit the present invention in any form. Therefore, any modifications or changes made to the present invention under the same inventive spirit should still be included in the scope of protection intended by the present invention.

Claims

1. A method for manufacturing a speaker vibration plate containing a water-soluble phenol formaldehyde resin, characterized in that: include: Phenol, formaldehyde and a catalyst are added into a reaction kettle to form a water-soluble phenol-formaldehyde resin, wherein the ratio of phenol to the total of phenol and formaldehyde is 30-50% (w / w), the ratio of formaldehyde to the total of phenol and formaldehyde is 50-70% (w / w), and the catalyst is 1-5% (w / w); react at a temperature of 65° C. for 1-4 hours; evacuate at an atmospheric pressure of 400-650 mmHg; cool to 35° C.; adjust the solid content to 67-69wt%, and adjust the pH to pH 7-10; unloading; and diluting with water to adjust the viscosity to 300-400 cps / 25°C to form a resin solution, wherein the gel time of the resin solution is 10-20 minutes / 150°C, the water-soluble phenol formaldehyde resin accounts for 65-70% of the resin solution, the water accounts for 30-35% of the resin solution, and the specific gravity of the resin solution is 1.20-1.30; A substrate is impregnated with the resin solution; Drying the substrate to form a solid resin layer on the substrate; forming a speaker vibration plate on the substrate; as well as Separating the speaker vibration plate from the substrate; Wherein, the following formula is the water-soluble phenol-formaldehyde resin: [C6H6OCH2O] n Wherein, n is 50 to 70.

2. The method according to claim 1, characterized in that The base material is woven from rock wool or glass fiber.

3. The method according to claim 1, characterized in that The pH value was adjusted to 9.2-9.7, and the specific gravity of the resin solution was 1.

23.

4. The method according to claim 1, characterized in that: The catalyst is selected from the group consisting of oxalic acid, hydrochloric acid, sulfuric acid, phosphoric acid, ammonia water, sodium hydroxide, barium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.

5. The method according to claim 1, characterized in that The step of drying the substrate further includes: using an extrusion device to squeeze out excess water-soluble phenol formaldehyde resin from the substrate; and baking the substrate at a temperature of 100 to 120° C. for a drying time of 10 to 30 minutes.

6. The method according to claim 1, characterized in that The step of forming the speaker vibration plate on the substrate further includes: hot pressing the substrate at a temperature of 130-180° C. for 30-90 minutes to form the speaker vibration plate on the substrate.

7. A speaker vibration plate containing a water-soluble phenol formaldehyde resin, characterized in that: include: one body; as well as a resin solid layer formed on the surface of the body by drying a resin solution; wherein the resin solution is formed by diluting a water-soluble phenol-formaldehyde resin with water, the composition of the water-soluble phenol-formaldehyde resin comprises phenol, formaldehyde and a catalyst, the proportion of phenol to the total of phenol and formaldehyde is 30-50% (w / w), the proportion of formaldehyde to the total of phenol and formaldehyde is 50-70% (w / w), the catalyst is 1-5% (w / w), the solid content of the resin solution is 67-69wt%, the pH of the resin solution is pH 7-10, the viscosity of the resin solution is 300-400cps / 25°C, the proportion of the water-soluble phenol-formaldehyde resin to the resin solution is 65-70%, the proportion of water to the resin solution is 30-35%, and the specific gravity of the resin solution is 1.20-1.30; and Wherein, the following formula is the water-soluble phenol-formaldehyde resin: [C6H6OCH2O] n Wherein, n is 50 to 70.

8. The speaker vibration plate according to claim 7, characterized in that: The body is woven from rock wool or glass fiber.

9. The speaker vibration plate according to claim 7, characterized in that: The pH value of the resin solution is 9.2-9.7, and the specific gravity of the resin solution is 1.

23.

10. The speaker vibration plate according to claim 7, characterized in that: The catalyst is selected from the group consisting of oxalic acid, hydrochloric acid, sulfuric acid, phosphoric acid, ammonia water, sodium hydroxide, barium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.

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