CN101626539A - Manufacture method of high performance paper loudspeaker diaphragm materials - Google Patents

Abstract

The invention relates to a manufacture method of high performance paper loudspeaker diaphragm materials, comprising the following steps: 1. pulping paper pulp; 2. pouring the processed paper pulp into a pulp tank, and adding cationic polyelectrolytes with weight being within 0.1-10%, concentration of paper pulp being within 0.1-8%, temperature being 10-50 DEG C, and reaction time being 1-5min; 3. adding anionic polyelectrolytes with weight being within 0.1-10%, and reaction time being 1-5min; 4. alternatively repeating step 2 and step 3, with processing times being the absorption layer number of polyelectrolytes on fiber surface of the paper pulp; and 5. carrying out next step of diaphragm forming processing. The invention has the beneficial effects that the paper loudspeaker diaphragm material produced by adopting the new method, test by paper loudspeaker diaphragm material dynamic complex modulus and damp tester, can realize the aim of elastic modulus and damping of the cone, thus meeting the requirements of the product such as miniaturization, large power and high quality.

Description

A kind of manufacture method of high performance paper loudspeaker diaphragm materials

Technical field

The present invention relates to the manufacture method of loudspeaker diaphragm materials, relate in particular to a kind of manufacture method of high performance paper loudspeaker diaphragm materials.

Background technology

Loud speaker is the signal of telecommunication can be transformed into acoustical signal and can be radiated the electroacoustic transducer that goes in the air, and it is widely used at aspects such as communication, broadcasting, education and daily lifes.The vibrating diaphragm of loud speaker is one of most important parts that constitute by loud speaker, and its effect is a radiation sound, and the material of vibrating diaphragm has fundamental influence to radiation characteristic, tonequality, tone, the tone color of loud speaker.A kind of application of new material tends to change the looks of loud speaker.Basic demand to loudspeaker diaphragm materials is: 1. the density of diaphragm materials is low as far as possible, guarantees that loud speaker has higher sensitivity; 2. the ratio spring rate (E/ ρ) of material is high as much as possible, (wherein E is the modulus of elasticity of material, ρ is a density of material), in other words require diaphragm materials promptly to want gently have higher physical strength again, can make vibrating diaphragm in wider frequency, do the piston motion like this, can effectively suppress to cut apart vibration, reduce the unevenness of frequency response, reduce distortion.3. require diaphragm materials that suitably big internal loss (being that damping factor is wanted greatly) will be arranged, can make frequency response curve smoother, reduce the Q value and also improve tonequality.

At present, the vibrating diaphragm kind is a lot, comprises papery diaphragm materials, metal diaphragm materials (as beryllium, almag, titanium etc.), macromolecule diaphragm materials (as polypropylene, polyethylene, liquid crystal polymer etc.), inorganic non-metallic diaphragm materials (as pottery, boron carbide, diamond etc.), composite diaphragm material or the like.The papery diaphragm materials, claim cone again, because advantages such as it is cheap, easy-formation, density is low, tone color is natural, design freedom is big, still occupy an leading position in numerous vibrating diaphragms, other diaphragm materials makes it to use owing to price height, difficult forming or processing technology are complicated has certain limitation.The process for making of traditionally on paper loudspeaker diaphragm materials generally is: earlier paper pulp is pulled an oar, carry out applying glue and dyeing then, last molded drying.Paper pulp is the primary raw material of making paper loudspeaker diaphragm, the ratio spring rate of the cone that traditional method is produced has been increased to the limit, damping coefficient generally has only about 0.04, can not satisfy the miniaturization of product, high-power, high-quality requirement, therefore will the production of traditionally on paper loudspeaker diaphragm materials be improved.

Summary of the invention

The objective of the invention is modulus of elasticity and damping, a kind of manufacture method of high performance paper loudspeaker diaphragm materials is provided especially in order to improve cone.This method is a kind of new method of making the papery diaphragm materials, by add chemical assistant in cone moulding forward direction paper pulp, in the hope of solving the technical problem that cone modulus of elasticity and internal damping can not improve simultaneously.

The technical scheme that the present invention is taked for achieving the above object is: a kind of manufacture method of high performance paper loudspeaker diaphragm materials, and this method may further comprise the steps:

(1), paper pulp is pulled an oar processing;

(2), the paper pulp after will handling is poured stock tank into, temperature is controlled at 10-50 ℃, earlier pulp density is adjusted in the 0.1-8% scope, stir then, under stirring condition, add cationic polyelectrolyte, the weight that adds cationic polyelectrolyte is controlled at cationic polyelectrolyte and paper pulp reaction time 1-5 minute in the 0.1-10% scope;

(3), the paper pulp after step (2) processing is stirred, under stirring condition, add the anionic polymerization electrolyte, add the electrolytical weight of anionic polymerization in the 0.1-10% scope, anionic polymerization electrolyte and paper pulp reaction time were controlled at 1-5 minute;

(4), alternately repeating step (2) and step (3) are handled paper pulp, number of processes promptly is that the pulp fiber surface polyeletrolyte adsorbs the number of plies;

(5), paper pulp after treatment carries out next step papery vibrating diaphragm processing and forming again.

The beneficial effect that the present invention produced is: the paper loudspeaker diaphragm materials that adopts new method to produce, detect through loudspeaker diaphragm materials dynamic complex modulus and damping test instrument, realized to improve the modulus of elasticity of cone and the purpose of damping, thereby satisfied the miniaturization of product, high-power, high-quality requirement.

Description of drawings

Fig. 1 is that polyeletrolyte is handled the influence curve figure of the number of plies to the papery diaphragm materials dynamic modulus of elasticity.

Fig. 2 is that polyeletrolyte is handled the influence curve figure of the number of plies to papery diaphragm materials fissipation factor.

Embodiment

The present invention uses two class chemical assistants, and a class is a cationic polyelectrolyte, and another kind of is the anionic polymerization electrolyte.Spendable cationic polyelectrolyte comprises polyamide polymeric amine epichlorohydrin (PAE), PAH (PAH), PAMC (CPAM), polyvinylamine (PVAm), polyamine (PA), polydiene propyl-dimethyl amine hydrochlorate (PDADMA), polymine (PEI), cationic starch etc.; Spendable anionic polymerization electrolyte comprises polyacrylic acid and salt (PAA), PAMA (APAM), sodium carboxymethylcellulose (CMC), alginic acid and salt thereof, anionic starch, based on interpenetrating network copolymer (PU-IPN) of polyurethane etc.

Concrete steps of the present invention are as follows:

(1), with paper pulp processing such as pull an oar, used paper pulp comprises the paper pulp that various raw materials and the whole bag of tricks obtain, as bleaching or do not float needlebush chemical pulp, bleaching or do not float cotton pulp, bleaching or do not float jute pulp etc.

(2), the paper pulp after will handling is poured stock tank into, temperature is controlled at 10-50 ℃, earlier pulp density is adjusted in the 0.1-8% scope, stir then, and under the condition of agitation as appropriate, add selected cationic polyelectrolyte, the weight that adds cationic polyelectrolyte is decided according to used kind, and generally in the 0.1-10% scope (with respect to absolute dried paper pulp) is controlled at cationic polyelectrolyte and paper pulp reaction time 1-5 minute.

(3), the paper pulp after step (2) processing is stirred, and under the condition of agitation as appropriate, add selected anionic polymerization electrolyte, adding the electrolytical weight of anionic polymerization decides according to used kind, generally in the 0.1-10% scope (with respect to absolute dried paper pulp) is controlled at anionic polymerization electrolyte and paper pulp reaction time 1-5 minute.

(4), alternately repeating step (2) and step (3) are handled paper pulp, number of processes promptly is that the pulp fiber surface polyeletrolyte adsorbs the number of plies; Be ground floor after the usefulness cationic polyelectrolyte pulp treatment promptly, be the second layer behind the usefulness anionic polymerization electrolyte treatment paper pulp again, repeat with being the 3rd layer after the cationic polyelectrolyte pulp treatment, again with being the 4th layer behind the anionic polymerization electrolyte treatment paper pulp, by that analogy, alternately reprocessing.

(5), paper pulp after treatment carries out next step papery vibrating diaphragm processing and forming (applying glue, dyeing, molded, drying) again, its forming shape can be flat board or taper.

The invention will be further described below by embodiment and accompanying drawing.

Embodiment 1:

Use polyamide polymeric amine epichlorohydrin (PAE) as cationic polyelectrolyte, with polyurethane as the interpenetrating network copolymer (PU-IPN) of main body as the anionic polymerization electrolyte, alternate treatment needlebush chemical pulp.Temperature control is generally room temperature, earlier pulp density is adjusted into 2% (water adjustment), stir then, and under the condition of agitation as appropriate, add selected polyamide polymeric amine epichlorohydrin (PAE), when the weight of the needlebush chemical pulp before the making beating is 100 grams (absolute dried paper pulp), the weight of using polyamide polymeric amine epichlorohydrin (PAE) is 1 gram, add the selected interpenetrating network copolymer based on polyurethane (PU-IPN) again, using with polyurethane is 2 grams as the weight of the interpenetrating network copolymer (PU-IPN) of main body.It handles number of plies to the influence of papery diaphragm materials dynamic mechanical as depicted in figs. 1 and 2, and handles the number of plies to the almost not influence of papery diaphragm materials density.

Embodiment 2:

Use polyamine (PA) as the anionic polymerization electrolyte, is handled the needlebush chemical pulp with polyamine (PA) as cationic polyelectrolyte, sodium carboxymethylcellulose (CMC) earlier, uses sodium carboxymethylcellulose (CMC) to handle twice totally once more then.Temperature control is generally room temperature, earlier pulp density is adjusted into 2% (water adjustment), stir then, and under the condition of agitation as appropriate, add selected polyamine (PA), add selected sodium carboxymethylcellulose (CMC) then, the weight of the needlebush chemical pulp before making beating is 100 grams (absolute dried paper pulp), the weight of using polyamine (PA) is 0.6 gram, when the weight of sodium carboxymethylcellulose (CMC) is 0.8 gram, the dynamic modulus of elasticity of papery diaphragm materials has not more improved 89% during adding assistant, density does not almost change, but fissipation factor has reduced by 11%.

Use amount for two kinds of polyeletrolytes does not have too strict requirement, and just use amount is low excessively, and its performance improves not obvious, if use amount is too high, can increase manufacturing cost, therefore, two kinds of polyeletrolyte optimum weight (with respect to absolute dried paper pulp) in the 0.4-4% scope of interpolation.

With reference to Fig. 1,2, by alternately adding two kinds of chemical assistants, increase along with number of processes, the papery diaphragm materials dynamic modulus of elasticity be changed to the waveform downward trend, the dynamic modulus of elasticity maximum of ground floor wherein, the dynamic modulus of elasticity numerical value of other even level will be lower than the dynamic modulus of elasticity numerical value of adjacent odd-level; And along with the increase of number of processes, the variation of papery diaphragm materials fissipation factor then is the waveform ascendant trend, the fissipation factor minimum of ground floor wherein, and the fissipation factor numerical value of other even level will be higher than the fissipation factor numerical value of adjacent odd-level.

Draw by above-mentioned analysis: in the paper loudspeaker diaphragm materials manufacture process, the performance requirement key that satisfy diaphragm materials is the number of plies, and number of plies key is two kinds of polyeletrolytes alternately repeating to add.By alternately adding cationic polyelectrolyte and anionic polymerization electrolyte, wrap up in the needed high molecular polymer of bag one deck at pulp fiber surface, thereby realized the modification of paper pulp fiber, and then change the performance of the diaphragm of loudspeaker.

Claims (1)

1, a kind of manufacture method of high performance paper loudspeaker diaphragm materials, this method may further comprise the steps:

(1), paper pulp is pulled an oar processing;

(2), the paper pulp after will handling is poured stock tank into, temperature is controlled at 10-50 ℃, earlier pulp density is adjusted in the 0.1-8% scope, stir then, under stirring condition, add cationic polyelectrolyte, the weight that adds cationic polyelectrolyte is controlled at cationic polyelectrolyte and paper pulp reaction time 1-5 minute in the 0.1-10% scope;

(3), the paper pulp after step (2) processing is stirred, under stirring condition, add the anionic polymerization electrolyte, add the electrolytical weight of anionic polymerization in the 0.1-10% scope, anionic polymerization electrolyte and paper pulp reaction time were controlled at 1-5 minute;

(4), alternately repeating step (2) and step (3) are handled paper pulp, number of processes promptly is that the pulp fiber surface polyeletrolyte adsorbs the number of plies;

(5), paper pulp after treatment carries out next step papery vibrating diaphragm processing and forming again.

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