PVB胶片的化学特性和物理特性
Chemistry and physics characteristic of PVB film
●基本特征 basic character：
化学名称chemistry name: 聚乙烯醇缩丁醛中间膜(俗称PVB胶片) Commonly known as PVB films
比重 proportion: 1．073
折射率 refractive index: 1．524
比热 specific heat: 0．4-0．5cal／g.℃
软化点 intenerate: 117℃-120℃
收缩率 shrink: <3．0％
含水量 containing water: 0．4，0．6％
拉伸强度 tensile strength: ≥200kg／cra
断裂伸长率 part elongate: ≥200％
延伸串 extend : ≥70％
厚度(mm) thickness: 0．38, 0．76，1．52
宽度(mm) width: 1220，1530，1830,2140, 2440
分子结构 molecule configuration:
-(CHCH2CHCH2)-+CH3CH2CH2CHO
I I
OH OH
聚乙烯醇(PVA) 丁醛(BA)
(CHCH2CHCH2)m -(CH2CH)n-
I I I
OH OH OH
＼ ／
CH
I
CH2CH2CH3 聚乙烯醇缩丁醛(PVB film胶片)
●乙烯醇基：23％重量比. vinyl alcohol group: Weight more than 23%,
加入增塑剂(4G7)，乙烯醇基达28％ Join plasticizer (4 G7), vinyl alcohol based of 28%
含有不等量的钾盐，添加剂 contain some kalium salt for additive
在普通氧化剂溶剂中会溶解(乙醇，酮，酯) it can melt in common oxidant solvent (ethanol ,ketone,ester )
●粘结机理： felt principle
玻璃中的SIOH和胶片小的COH基之间的氢键形成粘结力
Si-OH bond of glass combine with C-OH bond of PVB film in hydrogen bond state felting
胶片小的钾离子从玻璃中置换出氢，从而控制了粘结力
The kalium ion in film metathesis out hydrogen of glass,this step control the felt strength
水与COH基争夺和SIOH的结合
Water contest bond Si-OH of glass with C-OH of PVB film;
硬离子(钙，镁离子)妨碍了氢键的形成，降低了粘结力
Forcedly ion (calcium,magnesium ion) foreclose the forming of hydrogen bond,and debase felt force;
●物理特性 physical characteristic
无明显的熔点 it have not clear melting point
可承受250℃温度 can support 250℃
着火较慢，火焰传播较低 fire slow,blaze diffuse slow
不属于易燃物质 not belong to tinder
不属于危害性材料 not belong to harm material
易吸收水份 easy absorbe water
易受温度变化的影响 easy affect by temperature
折射率和玻璃接近 refractive index is near to glass
●粘结力受含水率的影响 felt strength is affacted with rate of containing water
PVB的含水率与相对湿度的关系 PVB rate of contain water relation with relative humidity
相对湿度为18％时，含水率为0．4％ relative humidity is 18% , rate of containing water is 0.4%
相对湿度为28％时，含水率为0．6％ relative humidity is 28% , rate of containing water is 0.6%
相对湿度为35％时，含水率为0．82％ relative humidity is 35% , rate of containing water is 0.82%
相对湿度为40％时，含水率为0．95％ relative humidity is 40% , rate of containing water is 0.95%
●本公司设备发明机理：intent principle of the one step PVB laminate machine
从PVB胶片粘结机理，可以看到，胶片与玻璃的粘结可靠性，并不是靠压力实现的，关键是： From PVB films bond mechanism，to see that film and glass the adhesive of the reliability, and not by pressure implementation, the key is:
1、胶片和玻璃的含水率要尽可能的小；Film and the moisture content of glass to the small as possible;
2、玻璃清洗最好用软水或去离子水，防止钙、镁等硬离子破坏氢键形成；
Glass cleaning, had better use soft water or deionized water, prevent calcium, magnesium and other hard ion damage hydrogen bond formation;
3、PVB胶片与玻璃的粘结化学反应，不需要压力条件，没有压力，粘结反应正常发生。
PVB films and glass the adhesive of the chemical reaction, do not need to pressure conditions, no pressure, binding reaction normal happen.
本公司设备原理：one step PVB laminate machine principle
1、我们的设备，在关键的除湿方面，设定了专门的除湿工序和除湿材料，保证粘结时，PVB胶片具有最小的含水率，与玻璃形成良好粘结，
The machine has special dehumidity process,insures that PVB film has the lowest humidity for felt,so we can obtain good laminating glass witch has no bubble and has more feltforcer than that of autoclave.
2、粘结工艺的保 |
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