聚氨酯膠粘劑
1聚氨酯膠粘劑成分
聚氨酯膠粘劑的主要成分是異腈酸酯或氨酯基,它們都是一些化學(xué)性質(zhì)和極性非常活潑的成分,與同樣非常活潑的含氫材料,如金屬、 玻璃、橡膠以及多孔材料泡沫、織物、塑料、紙張、木材等,有很強相互粘結(jié)力。
2聚氨酯膠粘劑配方
聚氨酯膠粘劑配方一般都會有以下三種原料:
第一種:NCO類原料(即二異酸酯或其改性物、多異酸酯)
第二種:oH類原料(即含基的低聚物多元醇、擴(kuò)鏈劑等,簡單一點說就是含活性氫的化合物)
第三種:溶劑和催化劑等添加劑
聚氨酯膠粘劑配方設(shè)計有以下兩種方案:
方案一:最簡單的配制法
0H類原料與NCO類原料或者是添加劑(只能取其一),兩種原料混合在一起,就可以使用。這類方案并不常用,因為它的粘結(jié)力不大。
方案二:比較常用的配置法
將NCO類及OH類原料進(jìn)行氨酯化改性。因為如果只是單純的將這些原料混合在一起,膠粘劑的粘度是不夠的,所以為了提高膠粘劑的初始粘度,就需要把聚醚或聚酯多元醇與TDI或MDI單體反應(yīng),從而制成NCO基或OH基的氨酸酯預(yù)聚物,然后再將NCO原料和OH原料混合使用。
3聚氨酯膠粘劑價格
從市面上聚氨酯膠粘劑的價格來看,價位并不高,應(yīng)該是在消費者可以接受的范圍內(nèi)。一般每500毫升的聚氨酯膠粘劑的價格大約在20-50元之間,當(dāng)然,不同的地方,價格會有一點區(qū)別,具體價格還是要以商家為主。
4聚氨酯膠粘劑種類
聚氨酯膠粘劑種類按照不同的分類性質(zhì),可以分為類別:
1、按照反應(yīng)組成分進(jìn)行劃分,就有含異氰酸酯基的聚氨酯膠黏劑、多異氰酸酯膠黏劑、聚氨酯樹脂膠黏劑、含羥基聚氨酯膠黏劑。
2、按照用途及性質(zhì)劃分,就有建筑用膠黏劑、結(jié)構(gòu)用膠黏劑、通用型膠黏劑、食品包裝用膠黏劑、鞋用膠黏劑、紙塑復(fù)合用膠黏劑、超低溫用膠黏劑、發(fā)泡型膠黏劑、厭氧型膠黏劑、熱熔型膠黏劑、導(dǎo)電性膠黏劑、壓敏型膠黏劑、水性膠黏劑、封閉型膠黏劑和密封膠黏劑等。
5聚氨酯膠粘劑工藝
1、把基層表面上的灰塵和油漬去除。
2、用有機(jī)溶劑對基層表面上的油、汗等污漬進(jìn)行清洗和干燥處理。
3、為了保持表面的光滑,還要進(jìn)行去粗糙的處理。一般是用砂紙進(jìn)行打磨。
4、如果是金屬、塑料或橡膠基層的話,還要進(jìn)行除銹、脫脂等化學(xué)處理。
5、在基層表面涂抹一層底膠。
6、按照配制方案正確配制聚氨酯膠粘劑。
7、開始粘接。先涂膠,然后晾置一會兒,再粘接。
8、固化膠粘劑。
6聚氨酯膠粘劑用途
聚氨酯膠粘劑的用途主要是在如下幾個方面:
1、汽車:擋風(fēng)玻璃、車頂車底、空調(diào)等。
2、木材:板材的鋪貼、家具制造等。
3、制鞋。
4、包裝:主要用于軟包裝中。
5、建筑:橡膠地墊的鋪設(shè)、PVC材料粘接,夾心板生產(chǎn)以及建筑防水涂料等。
6、油墨:彩印。
7、書籍裝訂。
8、鐵路建設(shè):鐵軌的鋪設(shè)。
9、其它。
7蠶絲被能曬嗎
由于蠶絲的特性,在加上人們對蠶絲被的晾曬眾說紛紜,很多消費者都比較迷茫,到底能不能曬的問題。其實蠶絲被是可以曬的,如果一直不曬,會有異味和濕氣,導(dǎo)致全棉的層套發(fā)霉,甚至是讓蠶絲結(jié)塊,但是在曬的時候需要注意以下幾點:
1、新做的蠶絲被會散發(fā)出一股蠶蛹的味道,只需將它放在通風(fēng)的地方2天就可以了。切不可長期暴露在強光下,一般控制在2個小時,既殺菌又增加保暖性,如果時間太長,會破壞蠶絲,導(dǎo)致變質(zhì)斷裂。
2、蠶絲被的晾曬環(huán)境要求為陽光稍微弱一點、通風(fēng)良好的條件,不僅可以接受充足的光照,而且不會破壞被芯。
3、蠶絲被的晾曬時間是有規(guī)律的,通常每1個月曬1~3次(干燥天曬1次,潮濕天曬2~3天),每次曬2~3小時,一般2小時就夠了,正反兩面都要曬到。時間一般選在上午10或下午3點前后,該段時間陽光不會太強。
4、蠶絲被每次曬好后最好用手輕輕拍打一下,以恢復(fù)蓬松感和保暖度,增加被子的使用年限。
8不銹鋼門安裝
安裝注意事項:
由于泥砂漿及石灰的腐蝕性,安裝及裝修期敬請注意勿讓水泥漿附著在不銹板面上,如不小心濺上,請及時用清水沖洗。
單門的安裝及校正:
1、所需工具及材料:沖擊鉆、鐵錘、鋼絲鉗、鉛垂、水平尺、膨脹螺栓M10×100、木片或硬紙片。
2、測量門洞尺寸是否與門框相符,如果門洞尺寸偏大或者偏小,則應(yīng)修整以能適應(yīng)為準(zhǔn)。
3、把不銹鋼門扇取下,將門框放入門洞,用水平尺、鉛錘等工具檢查門框是否擺正放平,必要時加墊木片或硬紙片,在門框安裝孔中套畫孔位置記號,然后取下門框。
4、用沖擊鉆在已做記號的墻上鉆孔,鉆孔時一定要平正,如有歪斜會直接影響裝門。
5、將框放入門洞,裝膨脹螺栓,先預(yù)緊固中間螺栓,確定平正后再固定其余螺栓。
6、把門扇套上門框,檢查開關(guān)是否靈活,門鎖位置是否準(zhǔn)確,若有異??勺鬟M(jìn)一步調(diào)整。
7、確認(rèn)無其它問題后,將全部膨脹螺栓緊固,如有條件可將螺母與螺栓焊牢。
一框兩門的安裝及校正:
1、所需工具及材料:沖擊鉆、鐵錘、鋼絲鉗、鉛垂、水平尺、水泥釘M10×80或膨脹螺栓M10×100、木片或硬紙片。
2、把不銹鋼門扇取下,將門框放入門洞,用水平尺、鉛錘等工具檢查門框是否擺正放平,若不平正,用木片墊平整。
3、先以內(nèi)門鉸一側(cè)作基準(zhǔn)邊,把門框加強筋上的安裝片旋轉(zhuǎn)至與門框垂直,然后將安裝片折彎用水泥釘或膨脹螺栓固定在墻上。
4、將內(nèi)不銹鋼門門扇套上門框,鎖上鎖,在確保平正的情況下,相繼把內(nèi)門安裝片固定在墻上。
5、用同樣的方法將柵欄門套上門框,固定好安裝片。
6、檢查內(nèi)門、柵欄門開關(guān)是否靈活,若有異??扇酒M(jìn)一步調(diào)整。
7、在門框與墻之間縫隙處塞木片,使門框較為穩(wěn)定,然后往門框內(nèi)灌注水泥砂漿,待水泥砂漿凝固干燥后把門縫外木片取出方可使用門的功能。但在24小時內(nèi),應(yīng)盡量減少開關(guān)門次數(shù)及力度。
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