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Stiffness modifier for paper cone and sample testing method

A testing method and modifier technology, applied in special paper, strength characteristics, testing material hardness, etc., can solve problems such as limited improvement in stiffness and rigidity, not ideal, affecting paper sound cone, etc.

Pending Publication Date: 2022-02-18
胡子和
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, paper cones are the most widely used. At present, about 90% of the speakers produced in the world still use paper diaphragm materials. The unique property is indispensable in the production of paper cones. It can be solved by increasing the thickness of the paper cone, reducing the pulp beating degree, or adding starch, chemical latex, water glass, or mixing with plastic resin. However, the current methods on the market are due to The improvement of stiffness and rigidity is limited, or it may affect the sound quality of the paper cone, and the effect is not ideal

Method used

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  • Stiffness modifier for paper cone and sample testing method

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Embodiment 1

[0029] refer to figure 1 , a stiffness modifier for paper sound cones, in a reactor with a reflux condenser, steam heating facilities, and temperature measurement facilities, add formaldehyde and melamine in a water-soluble environment with a pH value of 8.5, and react at 95 degrees Celsius for 30 minutes , let it stand for 5 minutes, the ratio of modifier, formaldehyde and melamine is 100:2:1, add methanol to react for 1.5 hours, the pH value is 5.5, react for 30 minutes, adjust to pH9.0 and concentrate in vacuum, after a certain viscosity, add over Hydrogen oxidation, react at 65°C for about 30 minutes, the viscosity of the modifier reaches a value between 200cp-220cp, the ratio of modifier, formaldehyde and melamine is 100:5:2, adjust the pH value of the modifier to 9.5, add a small amount of urea and water, finish the reaction after 1 hour, discharge the material, and conduct a sample test on the finished product.

Embodiment 2

[0031] refer to figure 2 , a sample test method for a stiffness modifier for a paper sound cone, slurry preparation: take a sufficient amount of unbleached pulp board (coniferous wood) imported from Canada, dissolve it, measure its percussion degree (14~20°SR), dilute Prepare the paper stiffness modifier YT auxiliary agent until the pulp concentration is 2%, and prepare the auxiliary agent for paper stiffness modifier YT: each weighs the required amount of auxiliary agent for each sample point, dilutes all of it to 30 times with water, prepares the paper stiffness modifier YT auxiliary agent and stirs 0.5 ~1.0h, in which no additives are added to the blank spots, respectively added to the above 2% slurry, stirred for 0.5~1.0 hours, and set aside, the unbleached pulp board is thawed with a Volt beater for about 30min, and the paper sheet is formed and sheet-made: add the above The slurry with additives is poured into the head box, bubbling and stirring, so that it flows throug...

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Abstract

The invention discloses a stiffness modifier for a paper cone and a sample testing method. The method comprises the steps of adding formaldehyde and melamine in a reaction kettle with a reflux condenser, a steam heating facility and a temperature measuring facility in a water-soluble environment with a pH value of 8.5, carrying out a reaction at 95 DEG C for 30 min, and standing for 5 min, wherein the ratio of the modifier to formaldehyde to melamine is 100: 2: 1; adding methanol, and reacting for 1.5 h, wherein the pH value is 5.5; reacting for 30 min, regulating the pH value to 9.0, performing vacuum concentration, after certain viscosity is achieved, adding hydrogen peroxide, and performing the reaction for about 30 min at the temperature of 65 DEG C, wherein the viscosity value of the modifier is 200-220 cp, and the matching value of the modifier, formaldehyde and melamine is 100: 5: 2; and regulating the pH value of the modifier to 9.5, adding a small amount of urea and water, ending the reaction after 1 h, and performing discharging. Sample testing is carried out on the modifier through slurry preparation, paper stiffness modifier YT assistant preparation, paper sheet forming, sheet making and sample cutting, and hardness measurement.

Description

technical field [0001] The invention relates to the technical field of speaker paper diaphragm production, in particular to a stiffness modifier for a paper sound cone and a sample testing method thereof. Background technique [0002] The raw materials for the production of loudspeaker paper diaphragms are rich in varieties, with different electroacoustic characteristics, natural sound quality and durable listening; the production process is simple and practical, and the raw materials are affordable. In this way, all kinds of pulp have always been the main production material of the loudspeaker diaphragm, and the paper cone is low in cost, and its timbre performance is good and its sensitivity is high. Therefore, paper cones are the most widely used. At present, about 90% of the speakers produced in the world still use paper diaphragm materials. The unique property is indispensable in the production of paper cones. It can be solved by increasing the thickness of the paper c...

Claims

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Application Information

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IPC IPC(8): D21H27/00D21H11/00D21H17/06D21H17/51D21H21/18C08G12/40G01N3/40H04R31/00
CPCD21H27/00D21H11/00D21H17/06D21H17/51D21H21/18C08G12/40G01N3/40H04R31/003G01N2203/0076G01N2203/0282
Inventor 胡子和
Owner 胡子和